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SR40•8
SR56•8
SERVICE MANUAL
1997, 1999 MACKIE DESIGNS, INC.
820-176-00
VERSION 1.1
Page 3 is interactive
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R IS Q U E D E C H O C E L E C T R IQ U E
N E P A S O U V R IR
C A U T IO N : T O R E D U C E T H E R IS K O F
E L E C T R IC S H O C K D O N O T R E M O V E
T H E C O V E R (O R B A C K )
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A T T E N T IO N : P O U R E V I T E R L E S
RISQ U E S DE C HO C E LE CT RIQ U E, NE
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A V IS :P O U R E V IT E R L E S R IS Q U E S
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C O U R A N T O U U N E A U T R E S O R T IE D E
CO U RA NT , SA U F S I LE S LA M E S
P E U V E N T E TR E IN S E R E E S A F O N D
S A N S L A I S S E R A U C U N E P A R T IE A
DECOUVERT.
T h is a p p a ra t u s d o e s n o t e xc e e d th e C la s s A /C la s s B (w h ic he v e r is a p p lic a b le ) lim its fo r ra d io
n o is e e m is s io n s fro m d ig ita l a p p a ra tus a s s e t o u t in th e ra d io in te rfe re nc e re g ula tio ns o f th e
C a n a d ia n D e p a r tm e n t o f C o m m u n ic a tio n s .
A T T E N T IO N : L e p ré s e nt a p p a re il n u m é riq u e n 'é m e t p a s d e b ru it s ra d io é le c triq ue s d é p a s s a n t
la s lim ite s a p p lic a b le s a u x a p p a re ils n u m é riq u e s d e c la s s A /d e c la s s B (s e lo n le c a s ) p re s c rite s
d a n s le ré g le m e n t s u r le b ro u illa g e ra d io é le c triq ue é d ic té p a r le s m in is te re d e s c o m m u n ic a tio ns
du Canada.
T h is e q u ip m e n t h a s b e e n te s t e d a n d fo u nd to c o m p ly w ith th e lim it s fo r a C la s s A d ig ita l
d e v ic e , p ur s u a n t to p a rt 1 5 o f th e F C C ru le s . T h e s e lim its a re d e s ig ne d to p ro vid e re a s o n a b le
p ro te c tio n a g a in s t h a r m fu l inte rfe re n c e w h e n t h e e q u ip m e n t is o p e ra te d in a c o m m e rc ia l
e n viro n m e nt. T h is e q u ip m e n t g e ne ra te s , u s e s , a nd c a n ra d ia te ra d io e n e rg y a n d , if no t
in s ta lle d p r o p e rly a nd u s e d in a c c o rd a n c e w ith th e in s tru c tio n m a n u a l, m a y c a u s e ha rm f u l
in te rfe re nc e to r a d io c o m m u n ic a tio ns . O p e ra tio n o f th is e q u ip m e n t in a re s id e n tia l a re a is lik e ly
to c a us e h a r m fu l inte rfe re n c e in w h ic h c a s e th e u s e r w ill b e re q u ire d to c o r re c t th e in te rf e re n c e
a t h is o w n e x p e ns e .
The lig htning flash w ith arrow hea d symb ol w ithin an
e quilateral tria n gle is in te nde d to alert the u se r to the
p re se nce of uninsulated "dan g erous v olta ge" w ithin the
p ro duct's enc losure, tha t m a y b e of sufficient m ag nitud e to
c onstitude a risk o f electric shock to pe rson s.
The exc lam a tion p oint w ithin a n e quila te ra l tria n gle
is in ten ded to a lert th e u ser to the p resen ce of
imp orta nt op era ting a n d m ain ten ance (servic ing )
instructio ns in the litera tu re a c com p anying th e
a pp lia n ce.
Le sym b ole écla ir ave c poin t de fléc he à l'inte rieur d 'un
tria n g le éq uila téra l est u tilisé p our a lerte r l'utilisa teur d e la
p rése nce à l'interie ur du co ffret de "vlo tag e dang e reu x" non
isole d'a m p leur suffisa n te p o ur co nstitu er un risque
d 'éléctrocution.
Le p oint d'excla m atio n à l'inté rieur d 'un tria ng le de
la p ré sence d 'in struction s im p orta nte s p our le
fonc tionne m ent e t l'e ntre tien (se rvice) d a n s le livret
d 'instru cion a cco m p ag na nt L'a p p a reil.
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CONTENTS
INTRODUCTION................................................................. 4
TECHNICAL SUPPORT ............................................................................... 4
DISCLAIMER .............................................................................................. 4
SYSTEM OVERVIEW ........................................................... 5
THE SR40•8 IN A NUTSHELL ......................................................................... 5
MATRIX ....................................................................................................... 5
STAGE MONITORS & EFFECTS ................................................................. 6
MONITORING, SOLO, & METERING ....................................................... 6
TALKBACK & INTERCOM .......................................................................... 7
ULTRA MUTE .................................................................................................... 7
SWITCH POSITIONS .................................................................................. 7
ULTRA MUTE FUNCTION SUMMARY ....................................................... 8
BLOCK DIAGRAM ....................................................................................... 1 0
SPECIFICATIONS ........................................................................................ 12
CIRCUIT THEORY ............................................................. 13
ANALOG CIRCUITS / SIGNAL PATH ......................................................... 13
INPUT CIRCUITRY .................................................................................... 14
PREAMP CIRCUITRY ............................................................................... 14
SOLO CONTROL CIRCUIT ........................................................................ 15
INPUT SOLO LOGIC ............................................................................... 16
OUTPUT SOLO LOGIC ............................................................................ 16
OTHER MATTERS ...................................................................................... 17
CLEAR COM INTERFACE ..................................................................... 18
CIRCUIT DESCRIPTION ........................................................................... 18
TRANSMIT SIGNAL PATH ......................................................................... 19
RECEIVE SIGNAL PATH ........................................................................... 19
CALL SIGNAL ........................................................................................... 19
IGNORE SWITCH (Rev 6 PCB) .............................................................. 20
IGNORE SWITCH (Rev A and higher PCBs) ....................................... 20
ULTRA MUTE ..................................................................................................... 22
CIRCUIT DESCRIPTION ............................................................................. 22
SELF TEST PROCEDURE .............................................................................. 24
PARTS ............................................................................... 25
QUICK PARTS ............................................................................................ 25
CONSOLE CHASSIS ASSEMBLY ............................................................... 29
POWER SUPPLY CHASSIS ASSEMBLY ...................................................... 41
CONSOLE PARTS LIST ............................................................................... 42
POWER SUPPLY PARTS LIST ...................................................................... 46
CONNECTOR PINOUT AND LOCATION....................... 48
SCHEMATICS / PCB LAYOUTS........................................ 54
INTRODUCTION
This manual contains complete service information for the SR40•8 and SR56•8 mixing
consoles and power supply. Operating instructions will be touched on briefly. For
complete operating instructions refer to the owner’s manual. For simplicity, this manual
will refer to both products as the SR40•8.
The SR40•8 is a large format mixing console designed for professional sound
reinforcement and recording. It features 40 input channels, 8 sub groups, 12x4 matrix,
RS232 / MIDI compatible microprocessor controlled muting, Clear-Com interface, and
more. The SR40•8 incorporates the latest technologies to provide sonic quality, price/
performance value, and legendary Mackie reliability.
SERVICE ON THE SR40•8 / SR56•8 IS
TO BE PERFORMED BY EXPERIENCED
TECHNICIANS ONLY!
To service the SR40•8, technicians should be familiar with op-amp based and discrete
analog circuitry, digital troubleshooting, and the operation / application of mixing
consoles. Presentation of this manual does not constitute endorsement of qualifications
by Mackie Designs.
! SMD !
! ESD !
The SR40•8 / SR56•8 make extensive
use of surface mount components.
Servicing technicians should have the
tools and experience to perform
surface mount rework.
The SR40•8 / SR56•8 contain
components that may be damaged
by electrostatic discharge. ESD
precautions should be taken when
servicing.
SERVICE TECHNICAL ASSISTANCE
Mackie Designs, Service Technical Assistance, is available 8AM - 5PM PST, Monday through
Friday for Authorized Mackie Service Centers, at 1-800-258-6883. Feel free to call with any
questions and speak with a carefully-calibrated technician. If one is not available, leave
a detailed message and a qualified Mackoid will return your call asap.
DISCLAIMER
The information contained in this manual is proprietary to Mackie Designs, Inc. The entire
manual is protected under copyright and may not be reproduced by any means without
express written permission from Mackie Designs, Inc.
4
SYSTEM OVERVIEW
THE SR40•8 IN A NUTSHELL
This section provides a quick summary of the SR40•8’s major features. It is not intended
to take the place of the owner’s manual. It is included here to help servicing
technicians familiarize themselves with the SR40•8.
MIXING
Channel controls manipulate mic/line signals in this order: phantom power, trim,
polarity, low cut filter, insert, EQ, mute, fader, pan, and assignment switches. These
signals are then assigned to the left, right and/or center mix, or to one of the eight
subgroups.
The main mix (left, right and center) typically feeds the main sound system. The left/right
mix can be controlled by individual faders or switched to share one fader. Subs 1-8 can
be assigned to the left/right or center mix, enabling them to be used as master faders
for submixes of channels. Alternatively, the subs can be used for secondary speaker
systems. More output routing options involve the matrix, discussed below.
MATRIX
The SR40•8 has 11 primary mix buses: left, right, center, and 8 subs. Via the channel’s
assignment switching, signals can be distributed among these buses. If a situation
demands a unique destination for each mix, the dedicated outputs for each of these
mixes will suffice.
More likely, a situation will demand that these 11 mixes be recombined in some way, to
feed off-site systems, delay towers, assistive listening systems, or special mixes for
recording or broadcast. Enter the Matrix.
The matrix is simply four separate 12 x 1 mixers. Its inputs include: left, right, center, subs
1-8 and an external input at the patch panel. Each matrix strip has a level control for
each of the eleven internal inputs as well as master level, solo and mute controls.
5
STAGE MONITORS & EFFECTS
Every channel, as well as each of the four main aux returns (A1-A4), has eight aux send
controls. Per channel, aux sends 1-4 can be switched to be post-fader (for effects
sends) or pre-EQ/pre-fader (for stage monitors). Aux sends 5-8 have a similar switch,
post-fader (for effects sends) or post-EQ/pre-fader (for stage monitors with EQ).
In the output section, aux sends can be routed in one of two ways. Normally, these aux
mixes are controlled by the rotary master level control and mute switch, and then sent
to TRS output jacks. This method is fine for effects sends or small applications. Larger
installations may demand more flexibility for the stage mixes. Enter the flip switch.
Each aux send master has a flip switch. This removes an aux mix from its dedicated
mute switch and level control, and diverts it to the like-numbered sub routing. This way,
an aux send designated for stage cueing will have its own dedicated 100mm fader,
“Air” EQ, insert, and balanced XLR output. Meanwhile, a flipped aux send also diverts
the sub signal to the original aux send master controls and TRS output, ensuring that sub
assignments can still be used.
When used for effects, aux sends are patched into the inputs of parallel effects devices,
like reverb and delay units. The outputs of these devices are the origin of aux return
signals. Aux return signals, or any stereo line-level signals, can be injected into either the
main aux returns or the “B” aux returns (or into pairs of channels). The main aux returns
provide most of the controls present in the channels: trim, high-pass filter, EQ, mute, pan,
and assign. “B” aux returns B1, B2, and B3 are dedicated to the left/right mix and offer
only rotary level and mute switch controls. (Aux return B4 is dedicated to the center
mix.) Additionally, there are two stereo line-level RCA tape returns, dedicated to the
left/right mix, with level control and mute switch.
MONITORING, SOLO, & METERING
Usually an engineer listens to the left/right mix (with the center mix blended in), just as
the audience is hearing it. Signals available for monitoring by the engineer are
available via either of the high-powered headphone outputs, with level control, or a
line-level monitor (control room) output, also with level control. There is a stereo insert
dedicated to the phones mix, to allow a delay device to synchronize the distance
delay present in large halls.
To audition individual signals or groups of signals, there are solo switches on every
channel, main aux return, aux send master, matrix A-D, tape return, and sub 1-8, as well
as the left/right/center faders. The engineer behind an SR40•8 can listen to any signal,
individually or in groups, without disturbing the content of any of the console’s primary
outputs. Input signals (channels, main aux returns, “B” aux returns, tape A, and tape B)
can be globally switched PFL (pre-fader-listen) or AFL (after-fader-listen, stereo-inplace). Output signals (main/left/right, subs 1-8, aux send masters, and matrix A-D) have
a similar switch.
There are 59 twelve-segment LED-ladder meter displays on the SR40•8, one for each
channel and sub, two for each stereo main aux return, and one each for the left/right/
center main mixes. Input and output meters can each be globally switched PFL or AFL.
During solo, described earlier, the left/right/center meters automatically display the solo
levels: AFL on the left/right meters and PFL on the center.
6
TALKBACK & INTERCOM
The SR40•8’s extensive talkback section allows the engineer to speak into several
outputs via a master talkback switch, with assignment switches for aux 1-4, aux 5-8, L/R
mix, an external talkback output, and one switch for each matrix (A-D). Talkback
microphones are patched into either of the two phantom powered XLR inputs and
regulated by a level control. Additionally, the talkback signal may be replaced by a
400Hz sine wave for checking levels, or pink noise for quickly checking frequency
response.
The Clear-Com Intercom System is already standard equipment in most large facilities.
It allows all crew members to share a “party line,” so they may communicate at will,
without having to toggle between send and receive. The Mackie SR40•8 takes that a
step farther by allowing the engineer to join in at his/her discretion using the talkback
microphone and phones outputs: No separate intercom headset is required for the
engineer.
ULTRA MUTE
Almost every signal path in the SR40•8 has an electronically-controlled mute switch,
including the channels, main aux return, subgroups, aux sends, and matrices. These
mutes may be activated in four ways: By pressing the local mute switch included for
each path, by assigning paths to a mute group, by assigning paths to a mute snapshot,
or by external MIDI and RS232 commands. Using just the local switches and mute
groups, an engineer can quickly mute or un-mute large groups of signal paths. Using an
external sequencer to generate MIDI muting commands, complicated muting moves
can be made automatically, with no user intervention.
When a channel or main aux return is muted, the entire channel is muted, including the
assign outputs, pre- and post-fader aux sends, and direct out. The insert send remains
active, as do the channel’s PFL meters and PFL solo outputs.
SWITCH POSITIONS
You may have noticed the white lines printed just above most of the push-button
switches on your SR40•8. We’ve put them there to make it easier for you to see if the
switch is engaged (down). Here’s how they work:
Assuming you are sitting in front of the console, when a switch is disengaged (up), its
button hides the white line from your field of vision. When you engage the switch, the
line suddenly appears. Although it may not seem obvious at first, you’ll soon find that
the indicator line really helps you determine switch positions at a glance. Clever, ain’t
it?
7
ULTRA MUTE FUNCTION SUMMARY
GENERAL
• There are 9 Sets of 10 Groups each, for a total of 90 Groups. Up to 10 Groups can be active
at a time within a Set.
• There are 100 Snapshots (00-99). Only one Snapshot can be active at a time.
• Snapshot 00 is loaded into the console when it is first powered up. Factory default is all
mutes off.
MODE
• Toggles between Group Mode and Snapshot Mode.
• When going from Group Mode to Snapshot Mode, you should press the DO IT button to
engage the Snapshot in the Numeric Display.
• When going from Snapshot to Group Mode, you must press CLEAR for two seconds to clear
the Snapshot’s mute configuration from the board. Then select the Group you want to
engage using the 0-9 buttons.
ARROW UP/DOWN BUTTONS
• In Group Mode, increments and decrements the Set Number in the Numeric Display (all
Groups must be OFF).
• In Snapshot Mode, increments and decrements Snapshots in the Numeric Display.
• In Snapshot Mode, press and hold the CLEAR and Arrow Up buttons to enter Auto-Increment
(Load-and-Go) mode. Then press the DO IT button to engage consecutively increasing
Snapshots.
• Press and hold the CLEAR and Arrow Down buttons to exit Auto-Increment mode.
SYSTEM BYPASS
• Turns off ULTRA MUTE. Disables all automation, including all MIDI commands received
through the MIDI or DATA ports.
Note: Sysex messages are still recognized while in Bypass mode. A Sysex data move does not
affect the console’s current mute status.
MUTE PREVIEW
• In Group or Snapshot Mode, allows viewing the mute configuration of programmed Snapshots or Groups without engaging them. Press DO IT to engage a previewed Snapshot or
Group.
• Press MUTE PREVIEW again to exit Preview Mode.
STORE
• In Group Mode, press STORE followed by a number button (0-9) to store a mute configuration in ULTRA MUTE’s memory.
• In Snapshot Mode, press STORE twice to store a mute configuration in ULTRA MUTE’s memory.
• Press CLEAR to exit Store mode without saving.
8
CLEAR
• In Group Mode, used to turn off all active Groups. Press and hold CLEAR for two seconds,
then release to turn off all mutes on the console. This also indicates which Groups have
been programmed (programmed Groups’ LEDs light up, unprogrammed Groups’ LEDs do
not).
• In Group Preview Mode, clears all Groups currently being previewed.
• In Snapshot Mode, press and hold for two seconds to turn off all mutes on the console.
• In Snapshot Preview Mode, clears Snapshot currently being previewed.
• In Snapshot Mode, press and hold the CLEAR and Arrow Up buttons to enter Auto-Increment
(Load-and-Go) Mode. Then press DO IT to engage consecutive Snapshots.
• Press and hold the CLEAR and Arrow Down buttons to exit Auto-Increment Mode.
• Press to abort a store procedure.
• To clear all programmed mutes, in Group or Snapshot Mode, press and hold the CLEAR and
MODE buttons for two seconds.
DO IT
• In Snapshot Mode, press DO IT to engage the Snapshot selected in the Numeric Display.
• In Auto-Increment Mode, press to advance to the next Snapshot.
• In Preview Mode, press DO IT to engage the Group or Snapshot selected.
NUMBER BUTTONS (0-9)
• In Group Mode, press number buttons to select Groups to engage, preview, or program.
• In Snapshot Mode, press number buttons to select a two-digit Snapshot number to engage,
preview or program. For example, to select Snapshot 5, press “0” and “5.” To select Snapshot
38, press “3” and “8.”
TO CREATE A GROUP:
1. Press the MODE button to enter Group mode (one digit lights in the numeric display).
2. Select the Set in which to store the Group by pressing the Arrow Up/Down buttons.
3. Activate all the mute switches you wish to store in the Group.
4. Press STORE.
5.Press a number button 0-9 to select the Group in which to store the current mute configuration.
TO CREATE A SNAPSHOT:
1. Press the MODE button to enter Snapshot mode (both digits light in the numeric display).
2. Select the Snapshot number in which to store the mute configuration by pressing the Arrow
Up/Down buttons, or by selecting the number using the number buttons 0-9.
3. Activate all mute switches you wish to store in the Snapshot.
4. Press STORE twice.
9
P H A N TO M
TR IM
SE N D
D IR EC T
O UT
IN SE RT
(BA L A N C E D )
R ETU R N
C
P O LA R ITY
M U TE
M IC IN
L-R
H PF
H PF
(L O W
C U T)
3 08 00
Hz
22
10
7
4
2
0
2
4
7
10
20
30
0V U = 0dBu
MONO
C HAN N EL
(1 O F 4 0 ,
SR 4 0 -8 ;
1 OF 56,
SR 5 6-8 )
80
5 0 0-1 5 K
12K
4 5 -3 K
F A D ER
PAN
F R EQ
1 -2
G A IN
F R EQ
P FL
AFL
(SIP)
SO LO
(M E TE R
A F L/PF L
R EL A Y)
(M U TE)
P RE
AUX 1
P RE
AUX 5
A U X SEN D 1 (2 -4 ID EN TIC AL)
H P F (L O W C U T)
LIN E IN
M ID M ID H I
E Q IN
LIN E IN
M E TE R
LO
H PF
1 50 H z
A U X SEN D 5 (6 -8 ID EN TIC AL)
E Q IN
LO
80
M ID M ID
8 00
3K
MUTE
HI
C
12K
TR IM
L-R
G A IN
F A D ER
LIN E IN
LO
80
H PF
1 50 H z
22
10
7
4
2
0
2
4
7
10
20
30
M ID M ID
8 00
3K
PAN
HI
1 -2
12K
M A IN A U X
R ETU RN (1 O F 4 )
P FL
M E TE R
0V U = 0dBu
(M E TE R
A F L/PF L
R EL A Y)
AFL
(SIP)
SO LO
P RE
AUX 1
P RE
AUX 5
A U X SEN D 1 (2 -4 ID EN TIC AL)
(M U TE)
A U X SEN D 5 (6 -8 ID EN TICA L)
A U X R E TU R N
B4 O N LY
C
LE V E L
LIN E IN L
A U X RE TU R N B1
(B2 , B3 , B4 ID EN TIC A L)
L-R
LIN E IN R
M U TE
'B ' A U X R E TU R N S
(4 TO TA L ) & TA P E
IN (2 TO TA L )
LIN E IN L
TA P E A IN
(TA PE B ID E N TIC A L )
P FL
AFL
(SIP)
LIN E IN R
SO LO
L (LE F T M A IN M IX)
R (R IG H T M A I N M IX )
C (C EN TE R M A IN M IX )
F O R SIM PL IC ITY, SU BS 3 -8 N O T SH O W N
F O R SIM PL IC ITY, A U X SEN D S 2 -4 A N D 6 -8 N O T SH O W N
B LO C K D IA G R A M
10
SU B 1
SU B 2
A U X SEN D 1
A U X SEN D 5
SO LO A U D IO (P F L, A F L-L & A F L R )
SO LO L O G IC
M U TE L O G IC
M E TE R L O G IC
SE N D
IN SE R T
(BA L A N C E D )
TO M A TR I X IN
R ETU R N
3K3
L FADER
L M IX
P FL
LIN K
(R = L+ R)
LE F T TA P E O U T
U LTRA M U TE ª
M ID I IN
M ID I O U T
LE F T M A IN O U T
A U TO M A T E D
M U TIN G SY STE M
AFL
(SIP )
M A IN LE F T/R IG H T/C E N TE R M IX
22
10
7
4
2
0
2
4
7
10
20
30
SO LO
TO M A TR I X IN
SE N D
IN SE R T
(BA L A N C E D )
3K3
R ETU R N
R IG H T TA P E O U T
R IG H T M A IN O U T
R FADER
R M IX
P FL
R S-2 32
0 V U = 0 d Bu
AFL
(SIP )
22
10
7
4
2
0
2
4
7
10
20
30
(M ETER A F L /P F L R EL A Y)
L-R
M E TE R S
C EN TE R
M E TE R
SO LO
SE N D
IN SE R T
(BA L A N C E D )
R ETU R N
(SO L O RE LA Y)
TO M A TR I X IN
C FADER
C EN TE R O U T
C M IX
P FL
AFL
(SIP )
M E TE R S: IN P U TS:
P F L/AF L
SO LO
M E TE R S: O U TP U TS:
P F L/AF L
M O N ITO R
LE V E L
L M O N ITO R O U T
SO LO
LO G IC
SO LO :
IN P U TS:
P F L/AF L
P H O N ES
LE V E L
SO LO :
O U TP U TS:
P F L/AF L
IN SE R T
(U N BA L)
R M O N ITO R O U T
R ETU R N
SE N D
IN SE R T
(BA L A N C E D )
(TA LK BA C K
D IM )
AIR
IN SE R T
(U N BA L)
SO LO LE V EL
P H O N ES 2 O U T
0 V U = 0 d Bu
MUTE
1 6 kH z
SU B 1
M IX
F A D ER
P FL
SU B 1
(1 O F 8 )
22
10
7
4
2
0
2
4
7
10
20
30
SU B 1
O UT
AFL
(SIP )
A SSIG N TO C TR
TO M A TR I X IN
SO LO
PAN
AUX 1
(1 O F 8 )
P H O N ES 1 O U T
F L IP
E XTER N A L T/ B O U T
A SSIG N TO L -R
LE V E L
TA L K B A C K
R O U TIN G
C LE A R -C O M (TM )
IN TE R C O M
SYS TE M
IN TE R F A C E
SU B 1
M E TE R
X LR
TA L K B A C K
SIN E
P IN K
3K3
TA P E O U T (M A TR IX
C & D O N L Y)
E XTER N A L IN
L
R
C (F R O M M A IN M IX)
M A TR IX O U T
A U X SEN D 1 M IX
P FL
SO LO
AFL
(SIP )
U LTR A M U TE
A U X SEN D 1 O U T
M U TE
1
2
3
4
5
6
7
8
(F R O M
SU BS)
LE V E L P O T
A F L /P FL SO L O
M E TE R L O G IC
M U TE L O G IC
SO LO L OG IC
SO LO A U D IO (P F L, A F L-L & A F L R )
M A TR IX A
(1 O F 4 )
A U X SEN D 5
A U X SEN D 1
A U X SEN D S 2-4 A N D 6 -8 N O T SH O W N
SU B 2
SU B 1
SU BS 3 -8 N O T SH O W N
C (C EN TE R M A IN M IX )
R (R IG H T M A I N M IX )
L (LE F T M A I N M IX)
11
SPECIFICATIONS
Noise
Master Fader @ Unity, channel gains down
Master Fader @ Unity, channel gains @ Unity
Signal to Noise Ratio (ref +4)
Total Harmonic Distortion
Crosstalk
Channel Fader down, channels @ Unity
Channel muted, other channels @ Unity
-95dBu
-95dBu
Frequency Response
20Hz to 60kHz
10Hz to 100kHz
+0/-1dB
+0/-3dB
Maximum Levels
Mic preamp input
All other inputs
Balanced XLR outputs
All other outputs
+22dBu
+22dBu
+28dBu
+22dBu
Impedances
Mic preamp input
All other inputs (except inserts): bal.
RCA outputs
All other outputs:
balanced
unbalanced
Equalization
Low EQ, shelving
Low Mid EQ, 1.5 octave bandwith
Mono channels: sweepable
Stereo channels: fixed
Hi Mid EQ, 1.5 octave bandwith
Mono channels: sweepable
Stereo channels: fixed
Hi EQ, shelving
High Pass Filter
Mono channels: sweepable
Stereo channels: fixed
Microphone Preamp
E.I.N.
Power Requirement
SR40•8/SR56•8 400-Watt Power Supply
Weight
SR40•8
SR56•8
Power Supply
12
-90dBu
-86dBu
≥90dB
Below 0.005%
2.4kΩ
>10kΩ
3.3kΩ
240Ω
120Ω
±15dB, 80Hz
±15dB, 45Hz-3kHz
±15dB, 800Hz
500Hz-15kHz
±15dB, 3kHz
±15dB, 12kHz
12dB/octave, 30-800Hz
18dB/octave, 150Hz
-129.5dBm
(20Hz-20KHz)
475W
110 lbs.
145 lbs.
44 lbs.
CIRCUIT THEORY
ANALOG CIRCUITS / SIGNAL PATH
The SR40•8 signal path begins with hybrid (discrete/op-amp) mic/line preamps. After the
mic/line preamp, the circuitry is largely op-amp based. The function of audio op-amp
“building blocks” should be self-evident from the schematics (If not, you need to fold up
this manual, put the screws back in the mixer, and take it to someone who knows
electronics!). This section will explain some of the circuits and architecture unique to the
SR40•8.
VLZ ARCHITECTURE
To keep thermal (Johnson) noise to a minimum, Mackie mixers employ VLZ architecture.
In VLZ, or “Very Low Impedance”, architecture internal impedances are kept as low as
practical in as many places as possible. Resistor values are scaled down by a factor of 3
to 4.
NJM4560 and NJM2068 op-amps are used to drive the lower internal impedances. These
devices’ outputs are capable of sinking more current than comparable devices.
It is critical that these op-amps not be substituted. Using NE5532 or TL0xx op-amps will
compromise performance.
(Yes, there are some costly devices that outperform the 4560 on paper, but in optimized
VLZ circuitry, they will offer little to no improvement. Besides, do you REALLY want to
replace 600+ SMD op-amps AND void the warranty?!!)
13
MIC/LINE PREAMP
The SR40•8 uses Mackie’s famous low-noise, high headroom mic/line preamp design. The
circuit has been revised since the version you may be familiar with from the earlier
Mackie products. It’s topology is more elaborate than a standard discrete differential
pair feeding an op-amp and has considerable performance advantages.
INPUT CIRCUITRY
Audio signal can be applied to either the XLR jack or ¼” TRS jack. From the XLR input
R140 and R141 provide fusing protection, C105,107, 108 roll RF, coupling capacitors
C101,106 block DC from the 48V phantom supply or any external source. From the ¼” TRS
input the signal passes through coupling caps C111,112. R114,115 provide a -20dB pad
when using the ¼” TRS input. Both inputs are clamped to within 12V of ground by
D101,102.
PREAMP CIRCUITRY
On the channel board further RF rolloff is provided by C101,102,103 and FB102,103.
Q103,104 form current sources for the differential pair Q101,102. Q105 provides a voltage
reference to U110A,110B that tracks the differential pair’s current source, providing
excellent DC stability and power supply rejection (reduced power-up pop).
Q101,102 function as discrete voltage to current stages for op-amps U110A,110B
respectively. Notice that the collectors of Q101,102 drive current to U110A,110B inverting
inputs, there is no voltage swing on the collectors. Gain is adjusted by R106. FB101 is
added for further RF rejection. The outputs of U110A,110B are then fed to the differential
op-amp U103A.
14
SOLO CONTROL CIRCUIT
The SR40·8 has two interlinked solo systems. One serves all inputs: channels 1 to 40, aux
returns A1-A4, B1-B4, and Tape inputs A and B. The other serves all outputs: subs 1-8, aux
sends 1-8, left, center, right, and matrices A-D.
Separate push-switches select between pre-fade-listen (PFL) and after-fade-listen/solo-inplace (AFL/SIP or just AFL). There is one switch for the input solo system, and another for
the output solo system.
The solo clock is generated on the Output Digital PCB. This arrangement allows the blink
rate of the solo LEDs to sync with the ULTRA MUTE system.
15
INPUT SOLO LOGIC
At any input, depressing the solo switch connects 5V to the solo LED and to the solo
control bus SOLO-CNTL-IP via a 4148 diode. The cathode of the solo LED connects to the
flash bus FLASH via a 220-ohm current-limiting resistor. The flash bus is a current sink and
only operates when an input has been soloed.
U1A is an LM339 comparator wired as an inverting buffer. Its output is wire-OR connected
to the output of U1C, another LM339 comparator, allowing U1C to short U1A to ground.
(note: unlike a standard op-amp used as a comparator the LM339 has a open collector
output and switches only to its negative supply. In this case, ground.) When SOLO-CNTLIP is higher than the solo reference voltage (1V, ref), U1C goes high, allowing U1A to pass
the solo clock. R70 and C157 form a lowpass filter which removes any extraneous “junk”
from the signal.
U1A drives power darlington transistor Q1202 through a shaping network consisting of
R1286, C1228, and R1287. Q1202’s collector is distributed to all input solo switches via the
FLASH bus, acting as a current sink for all input solo LEDs.
Comparator U1D’s inverting input is wired in parallel with U1C. U1D’s output goes low
whenever SOLO-CNTL-IP is high, controlling analog switches U1211D, U1211C, U3C, U3D,
and U3A. U1211 delivers input solo signals to the headphone system. U3 delivers input
solo signals to the LCR meters.
OUTPUT SOLO LOGIC
At any output, depressing the solo switch connects 5V to the solo LED and to the solo
control bus SOLO-CNTL-OP via a 4148 diode. The cathode of the solo LED connects to
the flash bus FLASH-OP via a 220-ohm current-limiting resistor. The flash bus is a current
sink and only operates when an output has been soloed.
U1B is an LM339 comparator wired as an inverting buffer. Its output is wire-OR connected
to U2B, another LM339 comparator, allowing U2B to short U1B to ground. When SOLOCNTL-OP is higher than the solo reference voltage (1V, ref), U2B goes high allowing U1B to
pass the solo clock. R75 and C159 form a lowpass filter which removes any extraneous
“junk” from the signal.
U1B drives power darlington transistor Q1 through a shaping network consisting of R43,
C150, and R44. Q1’s collector is distributed to all output solo switches via the FLASH-OP
bus, acting as a current sink for all output solo LED’s.
Comparator U2C’s non-inverting input is wired in parallel with U2B’s. U2C’s output goes
high whenever is high. U2C’s output controls analog switches U1211A, U1211B, U4A, U4B,
and U4C. U1211 delivers output solo signals to the headphone system. U4 delivers output
solo signals to the LCR meters.
16
OTHER MATTERS
Diode OR gate D4 and D5 drive comparator U2A, whose output goes low whenever
SOLO-CNTL-IP or SOLO-CNTL-OP is high. U2A’s active low output drives the LCR-MUTE line,
which controls shunt-series analog switches U1209A, U1209B, U1209C, and U1209D.
Q2 operates as a 25 mA current source for the Rude Solo Light (RSL). Diode OR gate D6,
D7 and D11 link both oscillators (U1A and U1B) to comparator U2D whose output drives
transistor Q3 which shorts and unshorts the RSL, causing it to flash. Note that the RSL is
out-of-phase with the solo LEDs at any of the solo switches; that is, they alternate. D11
couples the LCR-MUTE line to U2D, ensuring that the RSL is extinguished when nothing is
soloed (the resting state for U1A and U1B is low, which would allow the RSL to be on).
D8 couples the IP-SOLO line to the input to the SOLO-CNTL-OP comparators. Since U1D
acts as a current-sink, it (via D8) prevents the output solo comparators from functioning
any time that SOLO-CNTL-OP is present. This means that inputs have precedence over
outputs in the solo system; if an output is soloed, and the user solos any input, that input
will be heard, and the output solo muted. The corresponding output solo LED is
extinguished during this time.
17
CLEAR COM
INTERFACE
The Clear Com production intercom system is the de-facto standard within the music
industry. The SR40·8 has an integral Clear Com interface that emulates a standard belt
pack and ties it into the console’s headphone system. To use it, you use the console’s
talkback microphone and the solo system headphones. The interface provides the
standard Clear Com beltpack features: call button, call light, receive level control, and
push-to-talk switch. Of course, like any Mackie product, there’s some new thinking going
on to make your life easier.
One major problem for any intercom system is the possibility of a ground loop between
the audio console’s ground system and whatever ground the production intercom
system is using. In many situations, the stage lighting company provides the intercom. In
this case, the intercom system ground is most likely the same as the dimmer rack’s (nasty,
really nasty). It is best if this ground not come in contact with the audio console’s
ground.
The SR40·8’s Clear Com interface uses an isolation transformer to keep the two ground
systems completely separate. There is no possibility of a ground loop regardless of who
supplies the intercom system and where they get their ground from.
CIRCUIT DESCRIPTION
(Refer to the MASTER PCB schematic.)
The Clear Com intercom system uses a standard microphone cable as its means of
interconnection. Signal levels are low enough that the system can use a spare mic line in
the microphone snake. The three wires of the mic cable are used for: pin 1 - ground, pin
2 - 28V dc power, pin 3 audio. This is a party-line intercom system since all talkers and all
listeners share the same line. All stations are connected in parallel. The DC voltage on
pin 2 supplies power for the entire system. Any station can talk and any station can
listen. The system uses a low voltage DC signal applied to the audio line for signaling. A
simple darlington transistor switch monitors the DC conditions on the line and turns on a
light bulb when it detects a call signal.
One other competing intercom system, pioneered by RTS Systems (now a division of
Telex), uses a balanced line for the audio signal with the audio modulated onto the
power supply voltage. Ultrasonic tones provide addressable signaling. This system has
found a home within the broadcast and video production fields. The two systems are
not compatible without use of a special interface system.
18
TRANSMIT SIGNAL PATH
The transmit signal path begins at the talkback microphone. The intercom interface
takes the line level signal at U1705A and sends it to the intercom sub-system via JP1704
and JP1803.
Analog switch U1801A passes the transmit audio when the INTERCOM button has been
pressed. U1802A buffers the analog switch output and U1802B operates as a bidirectional current source that drives the intercom line via isolation transformer T1801.
RECEIVE SIGNAL PATH
Audio signals from the common party line appear on pin 3 of the XLR connector, pass
through isolation transformer T1801, and on to one input of diffamp U1803B. As far as
signals coming into the interface are concerned, the non-inverting input of U1803B is all
that matters. This audio passes on to analog switches U1801B (ignore), and U1801C (listen
when called).
The output of the analog switches drives U1803A, connected as an active variable gain
amplifier. The stage gain is variable from off to unity to 16dB. U1803A then feeds a mono
input into the headphone amplifier.
The input to the non-inverting side of the diffamp, U1803B, is also common to the output
of the bi-directional current source used to drive the line. Since the current source has a
high output impedance, it presents a minimal load to signals coming from the line.
Another input to the diffamp’s inverting input comes from the current source op-amp,
but prior to the current sensing resistor, R1807. The two signals are subtracted from each
other in the diffamp, and this partially cancels the audio signal (sidetone) that would
otherwise appear at U1803B during transmit times. Without sidetone cancellation, the
talker’s own voice would be very loud in their own headset.
CALL SIGNAL
When the outside world calls the SR40·8’s intercom station, the DC call signal travels
through T1801’s primary, turning on darlington pair Q1802 and Q1803, which turns on
opto-isolator U18. The intercom line powers this circuitry. The lowpass filter formed by
R1821 and C1807 and the filtering action of C1806 prevents the call system from being
activated by audio signals on the line. Opto-isolator U18 isolates the intercom system
ground from the SR40·8’s ground system for call signals.
On the revision 6 output PCB, the output of U18 drives the call lamp (physically located in
the INTERCOM switch) via Q1805 and simultaneously turning off the LED located in the
talkback switch, SW1 via Q1806. U18 also drives the listen-when-called switch U1801C.
From revision A on, Q1806 was replaced by a comparator, U1804D. U1804C drives the
lamp kill feature via JP1804.
When the SR40·8 originates a call signal, current source Q1801 supplies about 3 milliamps
to the intercom line whenever CALL switch, SW1801 is pressed.
19
IGNORE SWITCH (Rev 6 PCB)
If the SR40·8 shares the intercom line with the lighting company, there is a high degree of
activity on the line, which would ordinarily be distracting to the mix engineer. The ignore
switch isolates the SR40·8 from the intercom line, while still allowing it to be accessible.
When the IGNORE switch, SW1802, has been depressed, analog switch U1801B opens,
disconnecting the headphone system from the intercom receive audio. When a call
signal comes in, U18.4 goes low, which closes analog switch U1801C, re-connecting the
receive audio from the intercom to the headphone system in the SR40·8. During the time
that the call lamp is lit, the console operator is connected to the intercom system again
(assuming that they’re wearing the headphones).
Answering the call by pressing the INTERCOM switch charges C144 via D1806, closing
analog switch U1801.8, temporarily defeating the effect of pressing the IGNORE switch for
a time determined by the discharge of C144 through R1899. Double-clicking the ignore
switch quickly discharges C144 through R1832, resetting the ignore state.
The ignore LED monitors the state of the ignore timer (C144 and R1899) via analog switch
U1801.16 and Q1807.
IGNORE SWITCH (Rev A and higher PCBs)
If the SR40·8 shares the intercom line with the lighting company, there is a high degree of
activity on the line, which would ordinarily be distracting to the mix engineer. The ignore
switch isolates the SR40·8 from the intercom line, while still allowing it to be accessible.
When the IGNORE switch, SW1802, has been depressed, analog switch U1801B opens,
disconnecting the headphone system from the intercom receive audio. When a call
signal comes in, U18.4 goes low, which closes analog switch U1801C, re-connecting the
receive audio from the intercom to the headphone system in the SR40·8. During the time
that the call lamp is lit, the console operator is connected to the intercom system again
(assuming that they’re wearing the headphones).
Answering the call by pressing the INTERCOM switch charges C144 via D1806, closing
analog switch U1801.8, temporarily defeating the effect of pressing the IGNORE switch for
a time determined by the discharge of C144 through R1899. Double-clicking the ignore
switch quickly discharges C144 through R1832, resetting the ignore state. Another
comparator section monitors the state of the ignore timer (C144 and R1899) and drives
the ignore LED D1803.
20
CLEAR COM JUMPER OPTIONS
Name
Intercom prefader
Description
Makes talk level
independent of
R1741.
Modify talk level
Use with prefader mod
Change sidetone
level (rev A and
later)
Use to raise or
lower sidetone
level
Listen when
called
Bypasses ignore
switch when call
signal detected
Talk when called
Enables
microphone
when call signal
detected
Flashes console
lamps when call
signal detected
Lamp Kill (rev A
and later)
Procedure
JP1704, cut trace
between pins 2
and 3, jumper
pins 1 and 2.
JP1803, cut
jumper between
pins 2 and 3,
install resistor
voltage divider
across pins 1, 2,
and 3. Keep total
value below 10k
using a resistor,
bridge
E1804/E1805 to
lower, bridge
E1805/E1806 to
raise it. Try 4k7 for
starters. See
schematic.
locate JP1801,
cut trace
between pins 2
and 3, jumper
pins 1 and 2.
Locate JP1802,
install jumper.
Locate JP1804,
install jumper.
Default Setting
Post fader.
bypassed
Not present.
Normal sidetone
cancellation is
about 10 dB.
More
cancellation than
this is highly
dependent on
the intercom line
and its loading
conditions.
Enabled. (call
signal bypasses
ignore switch).
Disabled. Could
cause trouble in
high-noise
environments.
Disabled.
21
ULTRA MUTE
CIRCUIT DESCRIPTION
ULTRA MUTE is a microprocessor based system that stores and recalls specific mute states
on the SR40•8 console. The system uses a 12MHz 80C51 processor. The 80C51 CPU
produces a 14 bit address. The lower 8 bits are latched by a 74HC573 from the
multiplexed address/data bus. User presets are stored in a 24C65 non-volatile RAM.
To communicate with the console, the 80C51 CPU uses serial data sent along chains of
shift registers. There are three chains of shift registers; LED, FET, and SWITCH. The serial-inparallel-out LED chain controls all mute LEDs, the Ultra Mute control panel LEDs, and
numeric display. The FET chain is also SIPO and controls the DG213 analog switch ICs,
which perform the actual signal path muting. The SWITCH chain is parallel-in-serial-out. It
scans all mute switches and Ultramute control switches. All serial data is sent along the
MUTE BUS.
MUTE BUS PIN OUT AN D FUN C TION
Pin # N am e
Functio n
1
LED D ATA Serial data fo r all m ute LED s, co ntro l LED s and num eric display
2
LOAD LED Updates LED data to shift register parallel o utputs
3
SW D ATA Serial data fro m all m ute and co ntro l sw itches
4
LOAD SW Updates sw itch data fro m shift register parallel inputs
5
FET D ATA Serial data fo r all FET analo g sw itches
6
LOAD FET Updates FET data to shift register parallel o utputs
7
C LOC K
Serial clo ck fo r sw itch data
8
n/c
9
P-C LOC K Serial clo ck fo r LED and FET data
10
n/c
Obviously, it is critical that the mute bus is chained through the PCBs in the proper
sequence. The mute bus originates at the MUTE CONTROL BOARD, which contains the
CPU, EPROM, SRAM, NVRAM, UART and supporting IC’s. It next goes to the MUTE SWITCH
BOARD (daughter board of the master section) which contains all the Ultramute system
controls and numeric display. It continues to the OUTPUT DIGITAL BOARD which contains
the shift registers for the master section and also generates the solo clock. Finally, the
mute bus chains through all CHANNEL BOARDS in descending order. Each PCB in the
mute bus chain has designated MUTE BUS IN and MUTE BUS OUT connectors, no address
jumpers are required.
MIDI communication is handled directly by the 80C51 CPU. RS-232 communication is
processed by a 6850 UART. The UART clock comes from the factory set to 19.2K BAUD. It
can be modified to 9600 or 32.4K via JP1. For RS-232 communication, the SR40•8’s data
port uses a DB9 connector. Pin 3 is RDX (receiving line), pin 2 is TDX (transmitting line),
and pin 5 is ground (shield).
For complete MIDI implementation information, refer to the owner’s manual.
22
MUTE CONTROL BOARD
AD0-AD7
PW R DIST PCB
ULTRAM U TE 
SIM PLIFIED SC HEM ATIC
CPU
80C51
ADD
LATCH
74HC573
EPROM
27C128
6116
`
RS-232
UART
6850
A8-A13
M IDI IN
A0-A13
ULTRA MUTE SERIAL D ATA
MUTE BUS
M IDI OUT
SRAM
6116
NVRAM
24C65
OUTPUT DIGITAL BOARD
PREVIOUS CH'S
CHANNEL
MUTE
LEDs
74HC595
74HC595
74HC595
74HC595
74HC595
74HC595
LAST CHANNEL BOARD
SOLO CLOCK
MASTER
SECTION
MUTE
LEDs
NUM ERIC
DISPLAY
74HC595
MUTE
CO NTRO L
LEDs
74HC595
MUTE SW ITCH BOARD
LED DATA
LOAD LED
P-CLOCK
CHANNEL
ANALO G
SW ITCHES
74HC595
74HC595
74HC595
74HC595
MUTE BUS
MASTER
SECTION
ANALOG
SW ITCHES
FET D ATA
LOAD FET
CHANNEL
MUTE
SW ITCHES
74HC165
74HC165
74HC165
74HC165
74HC165
74HC165
74HC165
MASTER
SECTION
MUTE
SW ITCHES
MUTE
CO NTROL
SW ITCHES
SW ITCH DATA
LOAD SW ITCH
CLOCK
23
ULTRA MUTE SELF TEST PROCEDURE
The following procedure tests the Ultra Mute system. Performing it will not erase any
stored mute groups/scenes.
Step Procedure
1
Power off the console
Result / Verify
n/a (the console is off)
2
Connect MIDI in to MIDI out, connect
pins 2 and 3 on the data port
3
While powering up, hold down Ultramute 0, 1, and 2 LEDs light
control switches 0, 1, and 2
4
Release switches
Both numeric displays count 0-9, A-F (1-16
hex), all mute LEDs light
5
Individually press all mute switches
(sequence not relevant)
Switch’s corresponding LED shuts off while
switch is depressed
6
Individually press all Ultramute control
switches (sequence not relevant)
7
n/a (you accidentally burn your finger
soldering pins on an old DB9 plug)
Switch’s corresponding LED lights while switch
is depressed (bottom row switches light same
LED’s as top row)
Disconnect the MIDI in and MIDI out,
Count on the numeric displays stops (MIDI =
disconnect pins 2 and 3 on the data port first display, RS-232 = second)
8
Press Ultramute control switches 8 and 9
simultaneously
9
Press and hold Ultramute control switches All LEDs off
8 and 9 again
10
Release switches
24
All mute LEDs flash together
System bypass LED on, TEST COMPLETE
PARTS
QUICK PARTS
MONO CHANNELS
TRIM
10 K P O T , 1 3 0 -06 6 -0 2
K N O B , 7 6 0 -0 4 8 -0 1
PHANTO M PWR
B U T TO N , 7 6 0 -0 1 3 -0 0
S W IT C H , 5 0 0 -0 1 8 -0 0
LE D , 3 0 4 -0 2 7 -0 2
M A IN A U X R E T U R N S
TRIM
5 K B x2 PO T , 1 3 0 -0 1 3 -0 2
K N O B , 7 60 -0 4 8 -0 1
PHAS E
B U T TO N , 7 6 0 -0 1 3 -0 0
S W IT C H , 5 0 0 -0 1 8 -0 0
AUX SENDS
5 0 K G PO T , 1 3 0 -00 3 -0 2
K N O B , 7 60 -0 4 8 -0 2
AUX SENDS
50 K G PO T , 1 3 0 - 00 3 -0 2
K N O B , 7 6 0 -0 4 8 -0 2
AUX PRE
B U T TO N , 7 6 0 -0 1 3 -0 0
S W IT CH , 5 0 0 -0 18 -0 0
AUX PRE
B U T TO N , 7 6 0 -0 1 3 -0 0
S W IT C H , 5 0 0 -0 1 8 -0 0
HI EQ
5 0 K B x2 P O T, 1 3 0 -0 6 0 -0 2
K N O B , 7 60 -0 4 8 -0 3
HI EQ
50 K B PO T , 1 3 0 -0 0 2- 0 2
K N O B , 7 6 0 -0 4 8 -0 3
HI M ID
10 K B PO T , 1 3 0 -0 2 2- 0 2
K N O B , 7 6 0 -0 4 8 -0 3
HI M ID F RE Q
50 K Cx2 PO T , 1 3 0 -0 6 2 -0 2
K N O B , 7 6 0 -0 4 8 -0 3
HI M ID
5 0 K B x2 P O T, 1 3 0 -0 6 0 -0 2
K N O B , 7 60 -0 4 8 -0 3
LO W M ID
5 0 K B x2 P O T, 1 3 0 -0 6 0 -0 2
K N O B , 7 60 -0 4 8 -0 3
LO W EQ
5 0 K B x2 P O T, 1 3 0 -0 6 0 -0 2
K N O B , 7 60 -0 4 8 -0 3
LO W M ID
50 K B PO T , 1 3 0 -0 2 2- 0 2
K N O B , 7 6 0 -0 4 8 -0 3
LO M ID FR E Q
50 K Cx2 PO T , 1 3 0 -0 6 2 -0 2
K N O B , 7 6 0 -0 4 8 -0 3
LO W EQ
10 K B PO T , 1 3 0 -0 0 2- 0 2
K N O B , 7 6 0 -0 4 8 -0 3
HPF FREQ
50 K Cx2 PO T , 1 3 0 -0 6 2 -0 2
K N O B , 7 6 0 -0 4 8 -0 3
PAN
10 K A /C P O T , 1 3 0 -0 6 5 -0 2
K N O B , 7 6 0 -0 4 8 -0 4
EQ / H PF
B U T TO N , 7 6 0 -0 1 3 -0 0
S W IT CH , 5 0 0 -0 18 -0 0
EQ / HP F
B U T TO N , 7 6 0 -0 1 3 -0 0
S W IT C H , 5 0 0 -0 1 8 -0 0
PAN
1 0 K A /C P O T , 1 3 0 - 06 6 -0 2
K N O B , 7 60 -0 4 8 -0 4
40
M UT E
MUTE
B U T TO N , 7 6 0 -0 1 1 -0 0
S W IT C H , 5 0 0 -0 2 0 -0 0
LE D , 3 0 4 -0 2 7 -0 2
A4
M U TE
BUS AS SIGNS
B U T TO N , 7 6 0 -0 1 3 -0 0
S W IT C H , 5 0 0 -0 1 8 -0 0
MU TE
B U T TO N , 7 6 0 -0 1 1 -0 0
S W IT CH , 5 0 0 -0 20 -0 0
L E D , 3 0 4 -0 2 7 -0 2
B U S A S S IG N S
B U T TO N , 7 6 0 -0 1 3 -0 0
S W IT CH , 5 0 0 -0 18 -0 0
FA D E R
1 0 K Dx2 PO T , 1 3 0 -0 35 -0 0
K N O B , 7 60 -0 2 4 -0 1
FA D E R
10 K D P O T , 1 3 0 -0 34 -0 0
K N O B , 7 6 0 -0 2 4 -0 1
SOLO
B U T TO N , 7 6 0 -0 1 1 -0 0
S W IT C H , 5 0 0 -0 1 2 -0 0
LE D , 3 0 4 -0 2 7 -0 2
SOLO
B U T TO N , 7 6 0 -0 1 1 -0 0
S W IT CH , 5 0 0 -0 12 -0 0
L E D , 3 0 4 -0 2 7 -0 2
25
MASTER, 1 OF 2
POW E R STA TU S
A L L L E D 'S , 3 0 4 - 02 7 -0 2
D IM M E R S
50 K B PO T , 1 30 - 00 2 - 0 2
KN O B , 7 60 -04 8-0 4
PF L / A FL M E T E RIN G
B U T TO N , 7 6 0 - 0 1 3- 0 0
S W IT C H , 5 0 0 -0 18 - 00
F L IP
B U T TO N , 7 6 0- 0 1 3 - 0 0
S W IT C H , 5 0 0 -0 12 - 00
L E D , 3 0 4 - 02 7 -0 2
AU X M A S TE R S
5 0 K G PO T , 1 30 - 00 3 -0 2
K N O B , 7 6 0 - 04 8- 0 2
M U TE
M U TE
M U TE
M U TE
M U TE
MUTE
M U TE
M U TE
AU X B / TAP E R TN S
50 K G x2 P O T , 1 30 - 06 1 - 0 2
KN O B , 7 60 -04 8-0 1
AU X M U TE S
B U T TO N , 7 6 0- 0 1 1 - 0 0
S W IT C H , 5 0 0 -0 20 - 00
L E D , 3 0 4 - 02 7 -0 2
AU X S OL OS
B U T TO N , 7 6 0- 0 1 3 - 0 0
S W IT C H , 5 0 0 -0 12 - 00
L E D , 3 0 4 - 02 7 -0 2
M U TE S
B U T TO N , 7 6 0 - 0 1 3- 0 0
S W IT C H , 5 0 0 -0 18 - 00
R U D E S O L O L IG H T
L E D , 3 0 4 - 00 6 -0 0
PF L /S IP
B U T TO N , 7 6 0- 0 1 3 - 0 0
S W IT C H , 5 0 0 -0 18 - 00
SOLOS
B U T TO N , 7 6 0 - 0 1 3- 0 0
S W IT C H , 5 0 0 -0 12 - 00
LE D , 3 0 4 - 02 7 -0 2
M O N ITO R L E V E L
5 0 K G x2 P O T , 1 3 0 - 0 6 1 - 02
K N O B , 7 6 0 - 04 8- 0 1
U L TR A M U TE S E C TIO N
A L L S W IT C H E S , 5 0 0 - 0 2 1 - 0 0
A L L L E D 'S , 3 0 4 - 00 1 -0 0
D I S P L A Y , 3 04 -0 2 1- 0 0
L E N S , 7 8 0 -0 2 9 - 00
M O N IT O R M U T E
B U T TO N , 7 6 0- 0 1 1 - 0 0
S W IT C H , 5 0 0 -0 18 - 00
AI R
10 K B PO T , 1 30 - 02 2 - 0 2
KN O B , 7 60 -04 8-0 3
S U B A S S IG N S
B U T TO N , 7 6 0 - 0 1 3- 0 0
S W IT C H , 5 0 0 -0 18 - 00
SUB M UTES
B U T TO N , 7 6 0 - 0 1 1- 0 0
S W IT C H , 5 0 0 -0 20 - 00
LE D , 3 0 4 - 02 7 -0 2
SUB PANS
1 0 K A / C P O T , 1 3 0 - 06 5 -0 2
K N O B , 7 6 0 - 04 8- 0 4
1
2
3
4
5
6
7
8
SUB FADERS
1 0 K D P O T , 1 3 0- 0 34 - 00
K N O B , 7 60 - 02 4- 0 1
SUB S OLOS
B U T TO N , 7 6 0- 0 1 1 - 0 0
S W IT C H , 5 0 0 -0 12 - 00
L E D , 3 0 4 - 02 7 -0 2
26
MASTER, 2 OF 2
R E C E IV E
5 0 K G PO T , 1 3 0 - 0 0 3 -0 2
K N O B , 7 60 -0 4 8- 0 1
CAL L
B U T TO N , 7 6 0 - 0 1 1- 0 0
S W IT CH , 5 00 -0 2 0 - 0 0
A LL M A TRIX
CO NTRO L S
5 0 K G PO T , 1 30 -0 0 3 -0 2
K N O B , 7 6 0 - 0 4 8 -0 4
IG N O R E
B U T TO N , 7 6 0 - 0 1 3- 0 0
S W IT CH , 5 00 -0 1 8 - 0 0
L E D, 3 0 4- 0 2 7 -0 2
OSC LEVE L
5 0 K G PO T , 1 3 0 - 00 3 -0 2
K N O B , 7 60 -0 4 8- 0 1
OSC SWITCHES
B U T TO N , 7 6 0 - 0 1 3- 0 0
S W IT CH , 5 00 -0 1 8 - 0 0
T B M IC
XL R J A C K , 4 0 0 - 1 2 6 -0 0
S C R E W , 7 0 0 - 04 2 -0 0
TB LE VEL
5 0 K G PO T , 1 3 0 - 00 3 -0 2
K N O B , 7 60 -0 4 8- 0 1
M A TR IX M U TE S
B U T TO N , 7 6 0- 0 1 1 - 0 0
S W IT C H , 5 0 0 -0 20 - 00
L E D , 3 0 4 - 02 7 -0 2
TB A S S IGN
S W IT C H E S
B U T TO N , 7 6 0 - 0 1 3- 0 0
S W IT CH , 5 00 -0 1 8 - 0 0
A
B
C
SOLO LE VEL
5 0 K G x2 P O T , 1 3 0 - 0 6 1 - 02
K N O B , 7 60 -0 4 8- 0 1
D
M A TR IX M A S TE R S
5 0 K G PO T , 1 30 -0 0 3 -0 2
K N O B , 7 6 0 - 0 4 8 -0 1
M A TR IX S O LO S
B U T TO N , 7 6 0- 0 1 3 - 0 0
S W IT C H , 5 0 0 -0 12 - 00
L E D , 3 0 4 - 02 7 -0 2
PHONES LEVEL
5 0 K G x2 P O T , 1 3 0 - 0 6 1 - 02
K N O B , 7 60 -0 4 8- 0 1
LINK
B U T TO N , 7 6 0 -0 1 3- 0 0
S W IT C H , 5 0 0 -0 1 8 - 0 0
CENTER
LEFT
RIGHT
IN T C M / T B
S W IT CH , 5 00 -0 1 9 - 0 0
PL A TE , 5 5 0- 1 94 - 00
LE FT FAD ER
1 0 K D P O T , 1 3 0 - 0 3 4 -0 0
K N O B , 7 6 0 -0 2 4 - 0 0
CENTER FADER
1 0 K D P O T , 1 3 0 -0 3 4 - 0 0
K N O B , 7 6 0 - 0 2 4 -0 0
R IGH T FA D E R
1 0 K Dx2 PO T , 1 3 0- 0 35 - 0 0
K N O B , 7 6 0 -0 2 4 - 0 1
SOLO
B U T TO N , 7 6 0- 0 1 1 - 0 0
S W IT C H , 5 0 0 -0 12 - 00
L E D , 3 0 4 - 02 7 -0 2
SOLO
SOLO
PHO NE S
JA CK , 4 00 - 22 3 -0 0
PL A TE , 5 5 0- 2 13 - 00
S C R E W , 7 0 0 - 02 8 -0 2
SOLO
27
28
CONSOLE CHASSIS ASSEMBLY
CHASSIS ASSEMBLY, DRAWING 1 OF 6
ITEM
PART #
DESCRIPTION
1
551-025-00
ARMREST
2
550-187-00
TOP PANEL 24 CH
3
550-189-00
TOP PANEL MASTER
4
550-188-00
TOP PANEL 16 CH
5
551-026-00
METER BRIDGE
6
550-196-00
STIFFENER
7
550-193-10
SIDE PANEL RIGHT
8
550-193-20
SIDE PANEL LEFT
9
700-046-09
SCREW SEMS 10-32X3/4 (HANDLES)
10
710-012-00
FLAT WASHER # 10 (HANDLES)
11
712-033-00
FERRULE
12
712-032-00
HANDLES
13
400-126-00
XLR JACK TALKBACK MIC (PRE-ASSEMBLED)
14
550-213-00
JACK PLATE (PRE-ASSEMBLED)
A
700-028-00
SCREW SEMS 6-32X1/4 (TOP PANELS)
700-028-00
SCREW SEMS 6-32X1/4 (SIDE PANELS)
700-028-02
SCREW SEMS 6-32X3/8 (HEADPHONE JACK)
700-028-02
700-028-02
SCREW SEMS 6-32X3/8 (MTR
BRIDGE/STIFFENER)
SCREW SEMS 6-32X3/8 (STIFFENER SIDES)
C
700-035-04
SCREW TF 6-32X3/8 (ARMREST)
D
700-042-04
SCREW MACH 6-32X3/8 (TALKBACK MIC)
B
29
30
CHASSIS ASSEMBLY, DRAWING 2 OF 6
ITEM
PART #
DESCRIPTION
1
055-069-00
PCB ASSY. CHANNEL METER
2
055-076-00
PCB ASSY. MASTER METER
3
040-132-00
RIBBON CABLE 5C 74"
4
550-190-00
BACK PANEL 24 CH
5
550-192-00
BACK PANEL MASTER SECTION
6
550-191-00
BACK PANEL 16 CH
7
040-130-00
CABLE ASSY BLK 9" (NOT SHOWN)
8
040-131-00
CABLE ASSY GRN 3.5" (NOT SHOWN)
9
400-127-00
XLR LAMP JACK
10
550-194-00
NUTPLATE LAMP JACKS
A
700-028-00
SCREW SEMS 6-32X1/4 (BACK PANEL)
B
700-028-02
C
700-035-04
SCREW SEMS 6-32X3/8 (BACK PANEL SIDE,
GND)
SCREW TF 6-32X3/8 (POD PCBS)
D
700-042-04
SCREW MACH 6-32X3/8 (LAMP JACKS)
E
740-001-00
TYRAP 3-1/4 (LAMP WIRES TO STIFFENER)
31
32
CHASSIS ASSEMBLY, DRAWING 3 OF 6
ITEM
PART #
DESCRIPTION
1
780-029-00
DISPLAY LENS
2
720-002-00
TAPE USED ON ABOVE
3
055-075-00
PCB ASSY. MUTE SWITCH
4
040-104-00
RIBBON CABLE ASSY. 34C 16"
5
040-015-00
RIBBON CABLE ASSY. 34C 10"
6
055-074-00
PCB ASSY. MASTER OUTPUT
7
040-093-00
RIBBON CABLE ASSY. 40C 9.5"
8
040-103-00
RIBBON CABLE ASSY. 10C 5"
9
055-067-00
PCB ASSY. MONO CHANNEL
10
055-067-00
PCB ASSY. MONO CHANNEL
11
040-099-00
RIBBON CABLE ASSY. 26C 9.5"
12
055-071-00
PCB ASSY. STEREO CHANNEL
A
700-011-00
SCREW 4-40X1/4 BUTTON
33
34
CHASSIS ASSEMBLY, DRAWING 4 OF 6
ITEM PART #
DESCRIPTION
1
040-093-00
RIBBON CABLE ASSY. 40C 9.5"
2
040-102-00
RIBBON CABLE ASSY. 10C 15"
3
055-070-00
PCB ASSY. MONO POD
4
040-097-00
RIBBON CABLE ASSY. 40C 20"
5
040-098-00
RIBBON CABLE ASSY. 34C 27"
6
040-099-00
RIBBON CABLE ASSY. 26C 9.5"
7
040-104-00
RIBBON CABLE ASSY. 34C 16"
8
040-105-00
RIBBON CABLE ASSY. 34C 10"
9
055-073-00
PCB ASSY. MASTER POD
A
701-001-00
SCREW TYPE B 6X3/8 (RCA JACKS)
B
701-005-00
SCREW A-AB 6X1/4 (XLRS)
C
705-003-00
NUT HEX 1/4 JACK (1/4" JACKS)
D
710-002-00
WASHER FLAT, 1/4 JACK (1/4" JACKS)
E
710-001-00
WASHER INTERNAL STAR (1/4" JACKS)
35
36
CHASSIS ASSEMBLY, DRAWING 5 OF 6
ITEM PART #
DESCRIPTION
1
2
3
4
5
055-077-00
700-023-00
705-001-00
700-028-00
706-017-00
PCB ASSY. POWER DIST
SCREW MACH 6-32X1/2 BLK
KEPNUT 6-32 DC POWER IN
SCREW SEMS 6-32X1/4 (POWER DIST)
STANDOFF 4-40 JACKSCREW (DSUB CONN)
6
7
8
9
10
710-008-00
055-101-00
700-028-00
055-068-00
700-028-00
SPLITLOCK WASHER # 4 (DSUB CONN)
PCB ASSY. OUTPUT DIGITAL
SCREW SEMS 6-32X1/4 (OUTPUT DIGITAL)
PCB ASSY. MUTE CONTROL
SCREW SEMS 6-32X1/4 (MUTE CONTROL)
11
12
13
14
15
16
17
18
055-155-00
040-133-01
040-107-00
040-133-01
040-133-02
040-192-00
040-091-00
040-094-00
PCB ASSY. CLOCK BUFFER
RIBBON CABLE ASSY. 14C 2"
RIBBON CABLE ASSY. 3C 5"
RIBBON CABLE ASSY. 14C 2"
RIBBON CABLE ASSY. 3C 16"
RIBBON CABLE ASSY. 50C
RIBBON CABLE ASSY. 24C
RIBBON CABLE ASSY. 5C 77"
19
20
040-132-00
040-108-00
RIBBON CABLE ASSY. 5C 74"
RIBBON CABLE ASSY. 5C 12"
21
22
23
24
25
26
040-110-00
040-096-00
040-095-00
040-124-00
040-123-00
040-109-00
RIBBON CABLE ASSY. 3C 4"
RIBBON CABLE ASSY. 20C 12"
RIBBON CABLE ASSY. 3C 5"
CABLE ASSY. 4C 26"
CABLE ASSY. 2C 31"
RIBBON CABLE ASSY. 2C 10"
27
28
29
30
31
32
33
34
35
040-111-00
040-036-00
040-133-00
040-062-02
040-062-03
040-095-05
040-099-01
040-100-01
040-117-00
CABLE ASSY. 2C 25"
CABLE ASSY. 2C 12"
RIBBON CABLE ASSY. 14C 30"
RIBBON CABLE ASSY. 20C 18"
RIBBON CABLE ASSY. 20C 12"
RIBBON CABLE ASSY. 20C 12"
RIBBON CABLE ASSY. 26C 6"
RIBBON CABLE ASSY. 10C 12"
CABLE ASSY. 10C 18"
37
38
CHASSIS ASSEMBLY, DRAWING 6 OF 6
ITEM PART #
DESCRIPTION
1
760-060-10
ENDCAP - RIGHT
2
700-039-00
SCREW MACH 10-32X1/2 (END CAP)
3
700-043-09
SCREW TF 10-32X3/4 (END CAP)
4
700-043-15
SCREW TF 10-32X1-1/2 (END CAP)
5
700-045-04
SCREW SEMS 10-32X3/8 (END CAP)
6
780-028-00
METER LENS
7
760-60-20
ENDCAP - LEFT
8
550-195-00
BOTTOM COVER
9
700-028-02
SCREW SEMS 6-32X3/8 (BOTTOM COVER)
10
750-004-00
FOOT # 10
11
700-044-08
SCREW SEMS 6-32X5/8 (FEET)
12
840-024-00
DATE CODE LABEL
13
840-053-00
S/N LABEL
14
840-060-00
CAUTION LABEL
39
40
POWER SUPPLY CHASSIS ASSEMBLY
PART #
040-010-00
040-112-00
040-113-00
040-114-00
040-115-00
040-116-00
040-118-00
040-119-00
055-078-00
400-009-00
400-046-00
400-062-00
400-121-00
400-122-00
410-003-00
500-007-00
500-013-00
510-011-00
510-013-00
510-024-00
550-214-00
550-215-00
550-216-10
550-216-20
550-217-00
550-218-00
550-219-00
550-220-00
550-257-00
551-027-00
600-018-00
600-018-01
600-018-02
700-010-04
700-011-00
700-019-00
700-022-00
700-028-00
700-028-02
700-028-03
700-047-04
700-050-04
705-001-00
705-011-00
710-015-00
770-001-00
DESCRIPTION
CABLE RIBBON 22GA 7C 19IN (LED TO MAIN PCB)
CABLE DIS 18GA 1015 7C .156 9IN
CABLE DIS 18GA 1010 GRN/YEL 4IN LUG
CBL DIS 18GA 1010 BRN 11IN QD
CBL DIS 18GA 1010 BRN 18IN QDX2
CBL DIS 18GA 1010 BLU 20IN QD
CBL POWER CORD FEMALE TO MALE
CBL POWER CORD MALE TO MALE
PCB ASSY PWR SUPPLY SR40.8
CONN AC RECPT IEC W/FUSEHOLDER
CONN DSUB CIRCULAR FEMALE
CONN 20 .100X126GA END
CONN DSUB 7P CIRCULAR FEMALE
CONN DSUB 7P CIRCULAR MALE
INS SIL-PAD K6 W/ADHESIVE
THERMAL SWITCH 210-F
SWITCH ROCKER SPST 6A
FUSE SB 4A 5X20MM 250V
FUSE SB 7A 5X20MM 250V
FUSE SB 8A 5X20MM 250V
SMTL TOP COVER PS SR40.8
SMTL BOTTOM COVER PS SR40.8
SMTL SIDE RAIL RIGHT PS SR40.8
SMTL SIDE RAIL LEFT PS SR40.8
SMTL BRKT HEATSINK PS SR40.8
SMTL BRKT COWLING PS SR40.8
SMTL BRKT AC OUTPUT PS SR40.8
SMTL BRKT AC OUTPUT PS SR40.8
SMTL BRKT
HEATSINK SR40.8 PS
XFMR 40-56.8 PS 120V
XFMR 40-56.8 PS 230V
XFMR 40-56.8 PS 100V
SCREW TF 6-32X3/8 PHP BLKZC
SCREW MACH 4-40X1/4 BTN SKT BLKOX
SCREW MACH 10-32X3/8 PHP BLKZC
SCREW MACH 6-32X5/8 FIL PHP CLRRZC
SCREW SEMS 6-32X1/4 PHP BLKZC
SCREW SEMS 6-32X3/8 PHP BLKZC
SCREW SEMS 6-32X1/2 PHP BLKZC
SCREW SEMS 10-32X3/8 FIL PHL CLR
SCREW MACH 6-32X3/8 FIL PHL CLR
NUT LOCK 6-32
NUT LOCK 10-32
WASHER FLAT # 6 ZC
FAN 80MM 12VDC
41
SR40•8 SERVICE MANUAL
CONSOLE PARTS LIST
PART #
040-036-00
040-062-02
040-062-03
040-091-00
040-092-00
040-093-00
040-094-00
040-095-00
040-095-05
040-096-00
040-097-00
040-098-00
040-099-00
040-099-01
040-100-01
040-102-00
040-103-00
040-104-00
040-105-00
040-106-00
040-107-00
040-108-00
040-109-00
040-110-00
040-111-00
040-117-00
040-123-00
040-124-00
040-132-00
040-133-00
040-133-01
040-133-02
055-067-00
055-068-00
055-069-00
055-070-00
055-071-00
055-073-00
055-074-00
055-075-00
055-076-00
055-077-00
055-101-00
055-155-00
080-022-00
100-073-00
100-089-00
100-109-00
100-113-00
105-293-00
105-331-00
110-001-00
DESCRIPTION
DIS 22GA 1007 2C .10 12IN
RIB 28GA 20C .100 18IN
RIB 28GA 20C .100 12IN
RIB 28GA 24C 2MM AUX SEND
RIB 28GA 50C 2MM 55IN
RIB 28GA 40C .100 9.5IN
RIB 18GA 5C .156 77IN
RIB 28GA 10C .100 15IN
RIB 28GA 10C .100 9IN
RIB 18GA 3C .156 21IN
RIB 28GA 40C .100 20IN
RIB 28GA 34C .100 27IN
RIB 28GA 26C .100 9.5IN
RIB 28GA 26C .100 6IN
RIB 28G TRNS 10C .10 12IN
RIB 28GA 10C .100 15IN
RIB 28G TRNS 10C .100 5IN
RIB 28GA 34C .100 16IN
RIB 28GA 34C .100 10IN
RIB 28G TRNS 14C .10 16IN
DIS 22GA 1007 3C .156 5IN
RIB 18GA 5C .156 12IN
RIB 22G 1007 2C .100 10IN
RIB 18GA 3C .156 4IN
DIS 22G 1007 2C .100 25IN
RIB 28G TRANS 10C .100 18
DIS 22G 1007 2C .100 31IN
DIS 22G 1007 2C .100 42IN
RIB 18GA 5C .156 74IN
RIB 28GA 14C .100 36IN
RIB 28GA 14C .100 2IN
RIB 28GA 14C .100 16IN
PCB ASSY MONO CHAN - 40.8
PCB ASSY MUTE CNTRL -40.8
PCB ASSY CHAN METER -40.8
PCB ASSY MONO POD - 40.8
PCB ASSY STEREO CHAN 40.8
PCB ASSY MASTER POD 40.8
PCB ASSY MASTER OUT 40.8
PCB ASSY MUTE SWITCH 40.8
PCB ASSY MASTER MTR -40.8
PCB ASSY PWR DISTR - 40.8
PCB ASSY DIGITAL OUT 40.8
PCB ASSY CLOCK BUFFR 40.8
SA EPROM PROGMD - SR40.8
RES CF .125W 5% 10K OHM
RES CF .125W 5% 47K OHM
RES CF .125W 5% 1M OHM
RES CF .125W 5% 470K OHM
RES MF .125W 1% 1K00 OHM
RES MF .125W 1% 2K49 OHM
RES CF .25W 5% 10 OHM
PART #
115-373-00
130-002-02
130-003-02
130-011-02
130-012-02
130-013-02
130-015-00
130-017-02
130-022-02
130-028-02
130-033-02
130-034-00
130-035-00
140-017-00
140-033-00
140-037-00
140-042-00
140-044-00
140-049-00
140-051-00
140-054-00
140-057-00
140-060-00
140-061-00
140-062-00
140-064-00
140-065-00
140-066-00
140-068-00
140-069-00
140-070-00
140-072-00
140-073-00
140-074-00
140-076-00
140-077-00
140-079-00
140-080-00
140-081-00
140-083-00
140-085-00
140-086-00
140-087-00
140-089-00
140-090-00
140-091-00
140-092-00
140-094-00
140-095-00
140-097-00
140-098-00
140-099-00
DESCRIPTION
RES MF .25W 1% 6K81 OHM
POT RTY 50KB 9MM MNO H TN
POTRTY 50KG 9MM MN TN PAN
POT RTY 50KB 12MM DUAL TN
POT RTY 50KG 12MM DUAL TN
POT RTY 5KB 12MM DUAL TN
POT TRIM 50KB 6MM H
POT RTY 50KC 12MM DUAL TN
POT RTY 10KB 9MM MONO TN
POT RTY 10KCA 12MM DL TN
POT RTY 10KZ 12MM MNO TN
POT SLD 10KD 100MM MNRAIL
POTSLD 10KD 100MM DL MNRL
RES TF SM .1W 5% 4.7 OHM
RES TF SM .1W 5% 22 OHM
RES TF SM .1W 5% 33 OHM
RES TF SM .1W 5% 51 OHM
RES TF SM .1W 5% 62 OHM
RES TF SM .1W 5% 100 OHM
RES TF SM .1W 5% 120 OHM
RES TF SM .1W 5% 160 OHM
RES TF SM .1W 5% 220 OHM
RES TF SM .1W 5% 300 OHM
RES TF SM .1W 5% 330 OHM
RES TF SM .1W 5% 360 OHM
RES TF SM .1W 5% 430 OHM
RES TF SM .1W 5% 470 OHM
RES TF SM .1W 5% 510 OHM
RES TF SM .1W 5% 620 OHM
RES TF SM .1W 5% 680 OHM
RES TF SM .1W 5% 750 OHM
RES TF SM .1W 5% 910 OHM
RES TF SM .1W 5% 1K0 OHM
RES TF SM .1W 5% 1K1 OHM
RES TF SM .1W 5% 1K3 OHM
RES TF SM .1W 5% 1K5 OHM
RES TF SM .1W 5% 1K8 OHM
RES TF SM .1W 5% 2K0 OHM
RES TF SM .1W 5% 2K2 OHM
RES TF SM .1W 5% 2K7 OHM
RES TF SM .1W 5% 3K3 OHM
RES TF SM .1W 5% 3K6 OHM
RES TF SM .1W 5% 3K9 OHM
RES TF SM .1W 5% 4K7 OHM
RES TF SM .1W 5% 5K1 OHM
RES TF SM .1W 5% 5K6 OHM
RES TF SM .1W 5% 6K2 OHM
RES TF SM .1W 5% 7K5 OHM
RES TF SM .1W 5% 8K2 OHM
RES TF SM .1W 5% 10K OHM
RES TF SM .1W 5% 11K OHM
RES TF SM .1W 5% 12K OHM
PART PREFIX LEGEND
040- Cables
055- Finished PCB Assys
100- Pots and Resistors
200- Capacitors
300- Semiconductors
42
400- Jacks/Connectors
500- Switches
510- Fuses
550- Chassis Metal
600- Transformers
601- Inductors
610- Wires and Cables
640- AC Line Cords
700- Hardware
760- Knobs/Plastic
770- Fans
790- Misc./Packing
800- Printed Material
860- EPROM
VERSION 1.0
PART #
140-101-00
140-103-00
140-104-00
140-105-00
140-106-00
140-108-00
140-109-00
140-111-00
140-112-00
140-114-00
140-115-00
140-117-00
140-118-00
140-123-00
140-126-00
140-130-00
140-139-00
140-140-00
140-147-00
145-051-00
145-201-00
145-229-00
145-311-00
145-314-00
145-331-00
145-339-00
145-343-00
145-360-00
145-361-00
145-373-00
145-377-00
145-389-00
145-406-00
145-409-00
145-418-00
145-456-00
200-002-02
200-003-02
200-004-02
200-005-02
200-007-00
200-007-02
200-008-02
200-014-00
200-015-02
200-019-02
200-021-02
211-001-00
211-006-00
211-007-00
212-001-00
212-003-00
DESCRIPTION
RES TF SM .1W 5% 15K OHM
RES TF SM .1W 5% 18K OHM
RES TF SM .1W 5% 20K OHM
RES TF SM .1W 5% 22K OHM
RES TF SM .1W 5% 24K OHM
RES TF SM .1W 5% 27K OHM
RES TF SM .1W 5% 30K OHM
RES TF SM .1W 5% 36K OHM
RES TF SM .1W 5% 39K OHM
RES TF SM .1W 5% 47K OHM
RES TF SM .1W 5% 51K OHM
RES TF SM .1W 5% 62K OHM
RES TF SM .1W 5% 68K OHM
RES TF SM .1W 5% 100K OHM
RES TF SM .1W 5% 150K OHM
RES TF SM .1W 5% 200K OHM
RES TF SM .1W 5% 470K OHM
RES TF SM .1W 5% 510K OHM
RES TF SM .1W 5% 1M OHM
RES MF SM .1W 1% 3R32 OHM
RES MF SM .1W 1% 121 OHM
RES MF SM .1W 1% 237 OHM
RES MF SM .1W 1% 1K69 OHM
RES MF SM .1W 1% 1K82 OHM
RES MF SM .1W 1% 2K49 OHM
RES MF SM .1W 1% 3K01 OHM
RES MF SM .1W 1% 3K32 OHM
RES MF SM .1W 1% 4K99 OHM
RES MF SM .1W 1% 5K11 OHM
RES MF SM .1W 1% 6K81 OHM
RES MF SM .1W 1% 7K50 OHM
RES MF SM .1W 1% 10K0 OHM
RES MF SM .1W 1% 15K0 OHM
RES MF SM .1W 1% 16K2 OHM
RES MF SM .1W 1% 20K0 OHM
RES MF SM .1W 1% 49K9 OHM
PLY .018UF 10% 100V TR
PLY/FL .033UF 10% 100V TR
PLY .047UF 10% 100V TR
PLY .0068UF 10% 100V TR
PLY .01UF 10% 100V
PLY .01UF 10% 100V TR
PLY .0039UF 10% 100V TR
PLY .0033UF 10% 100V
PLY .0047UF 10% 100V PEI
PLY/BX .1UF 10% 63V TR
PLY .027UF 10% 100V TR
CER .01UF +80/-20% 25V AX
CER 20PF 10% 50V AX
CER 470PF 10% 50V AX
CER .01UF 10% 50V X7R SM
CER 100PF 5% 50V NPO SM
PART #
212-004-00
212-005-00
212-006-00
212-007-00
212-009-00
212-010-00
212-015-00
212-016-00
212-018-00
212-019-00
220-002-00
220-002-02
220-003-02
220-005-00
220-006-00
220-008-02
220-011-02
220-012-02
220-013-00
220-014-00
220-020-00
220-021-00
220-027-00
220-027-02
220-030-00
220-031-02
220-032-02
300-001-00
300-003-00
302-010-03
302-015-02
304-001-00
304-006-00
304-021-00
304-022-00
304-027-02
310-003-02
310-015-00
310-018-00
310-030-00
310-031-00
311-001-00
311-002-00
311-004-00
311-005-00
311-006-00
315-001-00
315-003-00
320-003-00
320-004-00
320-006-00
320-011-00
DESCRIPTION
CER 220PF 5% 50V NPO SM
CER 20PF 5% 50V NPO SM
CER 470PF 5% 50V NPO SM
CER .047UF 20% 50V Z5U SM
CER 47PF 5% 50V NPO SM
CER .1 +80/-20 25V Z5U SM
CER 33PF 5% 50V NPO SM
CER 1000PF 5% 5OV NPO SM
CER 10PF 5% 50V NPO SM
CER 150PF 5% 50V SM
LYT 47UF 20% 25V RAD
LYT 47UF 20% 25V RAD TR
LYT 47UF 20% 50V RAD TR
LYT 470UF 20% 25V RAD
LYT 2200UF 20% 25V RAD
LYT 1UF 20% 50V RAD TR
LYT 100UF 20% 25V RAD
LYT 4.7UF 20% 63V RAD TR
LYT .22UF 20% 50V RAD
LYT 2.2UF 20% 50V RAD
LYT 10000UF 20% 16V RAD
LYT 2200UF 20% 100V RAD
LYT 10UF 20% 50V RAD
LYT 10UF 20% 50V RAD TR
LYT 1000UF 20% 6.3V RAD
LYT 10UF 20 50V RAD KS TR
LYT 33UF 20 25V RAD KS TR
DIO SIG 1N4148 100W 500MW
DIO SW DL4148 100V SM
DIO ZEN DL5232B 5.6V SM
DIO ZEN SA12CA BI-DIR TR
LED RED T-1
LED RED T1-3/4
DISPL 7SEG 1 DIGIT YEL
LED ARRAY 70MM GRN\YL\RED
LED RED W/.425 SPACER TR
XSTR PNP 2SA1316 AMMO PK
XSTR NPN MJE3055
XSTR NPN TIP121
XSTR MOSFET NCHAN 40A 30V
XSTR MOSFET PCHAN 40A 30V
XSTR NPN IMBT4401 SM
XSTR PNP MMST4403 SM
XSTR SST112 SM
XSTR NPN MMBTA06LT1 SM
XSTR PNP IMBTA56 SM
CRYSTAL 12 MHZ
CRYSTAL 4.9152 MHZ
OPAMP 2068L 8P SIP
OPAMP 4560F
OPAMP 2068E
OPAMP 4560 8P SIP
PART PREFIX LEGEND
040- Cables
055- Finished PCB Assys
100- Pots and Resistors
200- Capacitors
300- Semiconductors
400- Jacks/Connectors
500- Switches
510- Fuses
550- Chassis Metal
600- Transformers
601- Inductors
610- Wires and Cables
640- AC Line Cords
700- Hardware
760- Knobs/Plastic
770- Fans
790- Misc./Packing
800- Printed Material
860- EPROM
43
SR40•8 SERVICE MANUAL
CONSOLE PARTS LIST (CONTINUED)
PART #
321-008-03
321-009-00
323-002-00
323-005-00
325-007-03
325-009-03
325-012-03
325-013-03
325-014-03
325-015-03
325-016-03
325-018-03
325-019-03
325-020-03
325-021-03
325-022-03
329-004-00
329-006-03
329-007-00
329-008-00
329-011-00
329-013-03
400-002-01
400-003-01
400-003-02
400-005-00
400-022-00
400-041-00
400-043-00
400-045-00
400-053-00
400-055-00
400-059-00
400-061-00
400-063-00
400-065-00
400-071-00
400-077-00
400-078-00
400-079-00
400-112-00
400-114-00
400-116-00
400-120-00
400-123-00
400-126-00
400-127-00
400-139-00
400-146-00
400-147-00
400-152-00
400-173-00
DESCRIPTION
REG LM317L ADJ SM
REG LM337T ADJ
LM339D QUAD COMP SM
LP339M QUAD COMP SM
TTL 74HC14A INV SH-TR SM
TTL 74HCT573 OCT D LATCH
TTL 74HC595 SHIFT REG SM
TTL 74HC165 8BIT SH RG SM
CMOS 4006 18STAGE SHFT RG
CMOS 4093 2IN NAND SCH-TR
TTL 74HC393 DUAL BIN CNT
DG213 QUAD ANALOG SW SM
TTL 74HC00 QUAD NAND SM
TTL 74HC04 HEX INV SM
CMOS 14C88 LIN DRV/RCV SM
CMOS 14C89 LIN DRV/RCV SM
27C128 16X8 BIT EPROM
80C51FA MICROPROCESSOR SM
MC6850 ACIA
PC900V OPTOISOLATOR
6116/5116 2048X8BIT SRAM
24C65 64K BIT SER EEPROM
XLR PCMNT NEUTRIK-RP SER
JACK 1/4 VERT PCMNT W/WSH
JACK 1/4 V PCMNT THIN WSH
HDR 40P .100X2 STR
RCA QUAD PCMNT
XLR VERT MALE PCMNT
HDR 26P .100X2 STR
7P CIRCULAR MALE PC MNT
HDR 10P .100X2 STR
HDR 34P .100X2 STR
TERM QDISC .250 MALE PCMT
HDR 2P .100X1 STR LOCK
HDR 3P .156X1 STR LOCK
TERM QDISC .250 F 18-22GA
DIN 5P PC MNT RTA
HDR 20P .1X2 STR LCK SHRD
HDR 10P .1X2 STR LCK SHRD
HDR 14P .1X2 STR LCK SHRD
HDR 50P 2MMX2 STR SHRD
HDR 6P .100X2 STR
HDR 24P 2MMX2 STR LK SHRD
DSUB 9P PCMT RTA F SMALL
HDR 4P .156X1 STR
XLR 3P FEMALE P-SERIES
XLR 4P FEMALE P-SERIES
SHUNT 2P .100
HDR 5P .156X1 STR LOCK
HDR 26P .1X2 STR LK SHRD
HDR 34P .1X2 STR LK SHRD
TERM .25 QKDS PCMT STABLE
PART #
401-001-28
410-002-00
500-012-00
500-018-00
500-019-00
500-020-00
500-021-00
550-187-00
550-188-00
550-189-00
550-190-00
550-191-00
550-192-00
550-193-10
550-193-20
550-194-00
550-195-00
550-196-00
550-197-00
550-198-00
550-199-10
550-199-20
550-213-00
551-025-00
551-026-00
553-002-04
553-003-03
553-006-01
553-006-06
553-007-03
600-017-00
601-002-00
601-003-00
601-004-00
611-006-00
611-029-01
611-030-01
620-037-00
700-011-00
700-023-00
700-028-00
700-028-02
700-028-03
700-035-04
700-039-00
700-042-04
700-043-09
700-043-15
700-044-08
700-045-04
700-046-09
701-001-00
DESCRIPTION
IC SOCKET 28PIN DIP
INSL SILPAD .007 SELF ADH
SW PUSH 4PDT V PCMNT LGCR
SW PUSH DPDT V PCMNT LGCR
SW PUSH SPST W/LED PCMNT
SW MOM DPDT V PCMNT LGCR
SW MOM SPST PCMNT 10.3MM
TOP PANEL 24CH - SR40.8
TOP PANEL 16CH - SR40.8
TOP PNL MASTER OUT-SR40.8
BACK PANEL 24CH - SR40.8
BACK PANEL 16CH - SR40.8
BACK PNL MSTR SECT-SR40.8
SIDE PANEL RIGHT - SR40.8
SIDE PANEL LEFT - SR40.8
NUTPLATE LIGHT JACKS-40.8
BOTTOM COVER - SR40.8
STIFFNER - SR40.8/56.8
POWER DIST BRKT - SR40.8
HTSK BRKT PWR DIST-40.8
GUARD BRKT RIGHT - SR40.8
GUARD BRKT LEFT - SR40.8
PLATE TALKBACK JACK-40.8
EXTR PNT ARMREST - SR40.8
EXTR SCRN MTR BR - SR40.8
CRS 18GA 30 X 120
CRS 16GA 48 X 120
EG 18GA 36 X 120
EG 18GA 36 X 72
AL .063 48 X 120
XFMR AUDIO PCMT SR40.8
INDUCTOR 4.7MH AX
INDUCTOR 1000UH AX
FERRITE CHIP 150 OHM
WIR 18G 1010 BLK 1.25 ST2
WIR 18GA 1007 BLK 9IN ST2
WIR 18GA 1007 GRN 3.5IN
CBL FLT 3C W/TABS .1 5IN
MCH 4-40X1/4 BTNSKT BLKOX
MCH 6-32X1/2 PHP BLKZC
SEMS 6-32X1/4 PHP BLKZC
SEMS 6-32X3/8 PHP BLKZC
SEMS 6-32X1/2 PHP BLKZC
TF 6-32X3/8 PHP CLRZC
MCH 10-32X1-1/2 PHP BLKZC
MCH 6-32X3/8 OVAL PHL SS
TF 10-32X3/4 PHP BLKZC
TF 10-32X1-1/2 PHP BLKZC
SEMS 6-32X5/8 PHP ZC
SEMS 10-32X3/8 PHP BLKZC
SEMS 10-32X3/4 PHP ZC
SM B 6X3/8 PHP BLKZC
PART PREFIX LEGEND
040- Cables
055- Finished PCB Assys
100- Pots and Resistors
200- Capacitors
300- Semiconductors
44
400- Jacks/Connectors
500- Switches
510- Fuses
550- Chassis Metal
600- Transformers
601- Inductors
610- Wires and Cables
640- AC Line Cords
700- Hardware
760- Knobs/Plastic
770- Fans
790- Misc./Packing
800- Printed Material
860- EPROM
VERSION 1.0
PART #
701-002-00
701-005-00
704-001-01
704-001-02
704-005-01
704-023-03
705-001-00
705-003-00
706-017-00
706-033-01
706-033-04
706-036-02
706-040-00
710-001-00
710-002-00
710-008-00
710-012-00
711-001-00
712-032-00
712-033-00
720-002-00
740-001-00
750-004-00
760-011-00
760-013-00
760-024-00
760-048-01
760-048-02
760-048-03
760-048-04
760-060-10
760-060-20
780-028-00
780-029-00
790-002-00
790-003-00
790-014-00
800-060-00
800-061-00
810-045-00
810-045-01
810-046-00
810-046-01
810-047-00
810-048-00
810-049-00
820-052-00
820-052-01
820-067-00
830-015-00
840-024-00
840-053-00
840-060-00
DESCRIPTION
SM B 6X1/4 PHP BLKZC
SM A-AB 6X1/4 PHP BLKZC
PEMNUT 6-32 .038 STL
PEMNUT 6-32 .054 STL
PEMNUT 10-32 .038 STL
STUD 6-32X.500 STL FLSH
KEPNUT 6-32
NUT (SPLD W/JACK)
STDF 4-40X.25 JACKSCREW
STDF SWAGE NO.4 X .542L F
STDF SWAGE NO.4 X .200L F
STDF 6-32X.250L STL PEM
SPCR PVC .200 LED
WASH STAR 3/8 OD .02 THK
WASHER (SPLD WITH JACK)
WASH SPLTLCK NO.4
WASH FLAT NO.10 FENDER
LUG NO.6 SOLDER STAR
HDL 1-7/8H 5L 1/2D AL PNT
FERRULE 1/2 DIA PNT
TAPE DS 10MIL X .75W CLR
TYRAP 3-1/4L
FOOT #10 BLK 1 X .562
BTN 9 X 9MM LG CORE
BTN 9 X 5MM LG CORE
KNOB SLIDE WHT 10X25MM
KNOB 9MM LT GRY
KNOB 9MM MAGENTA
KNOB 9MM BLU/GRY
KNOB 9MM DARK GRAY
ENDCAP RIGHT SR40.8
ENDCAP LEFT SR40.8
LEXAN - MB 40.8
DISPLAY LENS - 40.8
BAG POLY 12 X 18 2MIL
BAG POLY 3 X 3 2MIL
BAG 92X87 4MIL 46IN P-SHT
BOX BOTTOM SR40.8
BOX TOP SR40.8
FOAM END BTM LEFT SR40.8
FOAM END BTM RIGHT SR40.8
FOAM END TOP LEFT SR40.8
FOAM END TOP RIGHT SR40.8
FOAM CTR TOP SR40.8
FOAM CTR BOTTOM SR40.8
INST BAR SUPPORT SR40.8
OWN MNL - SR40.8/SR56.8
ADDEND - OWN MNL SR40/56
INSTL-REAR GUARD SR40/56
REG & WARR CARD - SR40.8
LBL DATE CODE
LBL SN SR40.8 AD
LBL SERIAL AND CAUTION
PART #
840-068-00
860-007-00
DESCRIPTION
LBL EPROM - SR40/56.8
EPROM SOFTWARE - SR40.8
PART PREFIX LEGEND
040- Cables
055- Finished PCB Assys
100- Pots and Resistors
200- Capacitors
300- Semiconductors
400- Jacks/Connectors
500- Switches
510- Fuses
550- Chassis Metal
600- Transformers
601- Inductors
610- Wires and Cables
640- AC Line Cords
700- Hardware
760- Knobs/Plastic
770- Fans
790- Misc./Packing
800- Printed Material
860- EPROM
45
SR40•8 SERVICE MANUAL
POWER SUPPLY PARTS LIST
PART #
040-101-00
040-112-00
040-118-00
040-119-00
055-078-00
100-044-00
100-047-00
100-051-00
100-057-00
100-073-00
110-027-00
110-029-00
110-032-00
110-046-00
110-049-00
110-056-00
110-065-00
110-072-00
110-079-00
110-080-00
110-083-00
115-269-00
115-298-00
115-331-00
115-350-00
115-376-00
115-407-00
115-427-00
121-088-00
121-093-00
122-043-00
123-056-00
125-018-00
200-001-02
210-013-02
211-001-00
220-003-02
220-004-02
220-006-00
220-007-00
220-011-02
220-020-00
220-021-00
220-022-00
220-023-00
220-024-00
220-025-00
220-026-00
300-001-00
300-006-00
301-001-00
301-003-00
DESCRIPTION
RIB 22GA 7C .100 19IN
DIS 18GA 1015 7C .156 9IN
POWER CORD FEMALE TO MALE
POWER CORD MALE TO MALE
PCB ASSY PWR SPLY - 40.8
RES CF .125W 5% 620 OHM
RES CF .125W 5% 820 OHM
RES CF .125W 5% 1K2 OHM
RES CF .125W 5% 2K2 OHM
RES CF .125W 5% 10K OHM
RES CF .25W 5% 120 OHM
RES CF .25W 5% 150 OHM
RES CF .25W 5% 200 OHM
RES CF .25W 5% 750 OHM
RES CF .25W 5% 1K OHM
RES CF .25W 5% 2K OHM
RES CF .25W 5% 4K7 OHM
RES CF .25W 5% 9K1 OHM
RES CF .25W 5% 18K OHM
RES CF .25W 5% 20K OHM
RES CF .25W 5% 27K OHM
RES MF .25W 1% 619 OHM
RES MF .25W 1% 1K24 OHM
RES MF .25W 1% 2K49 OHM
RES MF .25W 1% 3K92 OHM
RES MF .25W 1% 7K32 OHM
RES MF .25W 1% 15K4 OHM
RES MF .25W 1% 24K9 OHM
RES MO 1W 5% 4K3 OHM
RES MO 1W 5% 6K8 OHM
RES MO 2W 5% 5.6 OHM
RES MO 3W 5% 20 OHM
RES WW 5W 10% .51 OHM
PLY .012UF 10% 100V TR
CER 2700PF 10% 50V Y5P TR
CER .01UF +80/-20% 25V AX
LYT 47UF 20% 50V RAD TR
LYT 470UF 20% 6.3V RAD TR
LYT 2200UF 20% 25V RAD
LYT 100UF 20% 100V RAD
LYT 100UF 20% 25V RAD
LYT 10000UF 20% 16V RAD
LYT 2200UF 20% 100V RAD
LYT 22000UF 20% 35V RAD
LYT 6800UF 20% 35V RAD
LYT 100UF 20% 35V RAD
LYT 1000UF 20% 35V RAD
LYT 1000UF 20% 100V RAD
DIO SIG 1N4148 100W 500MW
DIO SW 8AMP/200V ULTRAFST
DIO PWR 1N4002
DIO PWR 1N5401 3A 100V
PART #
301-005-00
302-005-00
302-007-00
302-012-00
304-004-00
310-002-00
310-004-00
310-007-00
310-014-00
310-015-00
310-016-00
310-017-00
310-018-00
310-019-00
310-020-00
321-006-00
321-007-00
400-009-00
400-015-00
400-046-00
400-060-00
400-061-00
400-062-00
400-065-00
400-065-00
400-065-00
400-065-00
400-121-00
400-122-00
400-122-00
400-124-00
400-125-00
400-148-00
400-149-00
410-003-00
450-078-00
500-007-00
500-013-00
510-001-00
510-003-00
510-013-00
510-014-00
510-015-00
510-021-00
550-214-00
550-215-00
550-216-10
550-216-20
550-217-00
550-218-00
550-219-00
550-220-00
DESCRIPTION
DIO FAST RECOVERY FR602
DIO ZEN 1N4732A 5V .4X.3
DIO ZEN 1N5234C 6.2V 2%
DIO ZEN 5257 33V 500MV
LED GREEN T-1
XSTR PNP 2N4403
XSTR NPN MPSA06
XSTR NPN 2N4401
XSTR PNP MJE2955
XSTR NPN MJE3055
XSTR NPN MPSA18
XSTR PNP MPSA56
XSTR NPN TIP121
XSTR NPN TIP31A
XSTR PNP TIP32A
REG 78T12 +12V
REG 78T05 +5V
IEC W/FUSEHOLDER
HDR 7P .156X1 STR
7P CIRCULAR FEMALE CBLEND
FUSE CLIP PCMT 5MM DIA
HDR 2P .100X1 STR LOCK
2P .100X1 26GA END
TERM QDISC .250 F 18-22GA
TERM QDISC .250 F 18-22GA
TERM QDISC .250 F 18-22GA
TERM QDISC .250 F 18-22GA
7P CIRCULAR FEMALE PNLMNT
7P CIRCULAR MALE CBL END
7P CIRCULAR MALE CBL END
HDR 11P .156X1 STR LOCK
HDR 7P .100X1 STR LOCK
HOUSING 11P .156 LOCK
TERM CRIMP 18-20GA PHOSBZ
INSL SILPAD K6 W/ADHESIVE
PCB POWER SUPPLY - 40.8
THERMOSTAT 210-F
SW RCKR SPST 6A PWR SFTY
FUSE SB 1A 5X20MM 250V
FUSE SB .25A 5X20MM 250V
FUSE SB 7A 5X20MM 250V
FUSE SB 6.3A 5X20MM 250V
FUSE SB 1.6A 5X20MM 250V
FUSE FB 10A 5X20MM 250V
TOP COVER PWR SPLY-SR40.8
BTM COVER PWR SPLY-SR40.8
SIDE RAIL RIGHT PS-SR40.8
SIDE RAIL LEFT PS-SR40.8
BRKT HEATSINK PS - SR40.8
BRKT COWLING PS - SR40.8
BRKT FAN PS - SR40.8
BRKT AC OUTPUT PS-SR40.8
PART PREFIX LEGEND
040- Cables
055- Finished PCB Assys
100- Pots and Resistors
200- Capacitors
300- Semiconductors
46
400- Jacks/Connectors
500- Switches
510- Fuses
550- Chassis Metal
600- Transformers
601- Inductors
610- Wires and Cables
640- AC Line Cords
700- Hardware
760- Knobs/Plastic
770- Fans
790- Misc./Packing
800- Printed Material
860- EPROM
VERSION 1.0
PART #
551-027-00
553-001-03
553-002-04
553-005-03
553-005-03
553-007-03
553-007-03
553-007-03
600-018-00
600-018-01
600-018-02
611-038-00
611-038-01
611-039-00
611-040-00
611-040-01
630-001-00
630-001-00
640-001-00
700-010-04
700-011-00
700-019-00
700-022-00
700-028-00
700-028-02
700-028-03
700-047-04
700-050-04
704-001-00
704-001-01
704-001-01
704-001-01
704-001-02
705-001-00
705-011-00
706-036-00
706-036-04
706-036-11
710-015-00
711-001-00
711-001-00
730-001-00
730-003-00
740-003-00
770-001-00
790-002-00
790-011-00
800-064-00
810-053-00
810-054-00
810-055-00
820-044-00
DESCRIPTION
EXTR HEATSINK - SR40.8 PS
CRS 20GA 48 X 120
CRS 18GA 30 X 120
CRS 11GA 48 X 120
CRS 11GA 48 X 120
AL .063 48 X 120
AL .063 48 X 120
AL .063 48 X 120
XFMR 40/56.8 PS 120V
XFMR 40/56.8 PS 230V
XFMR 40/56.8 PS 100V
WR 18G 1010 GN/YL 4IN ST2
WR 18G 1010 GN/YL 9IN ST2
WIR 18G 1010 BLU 20IN ST2
WIR 18G 1010 BRN 11IN ST2
WIR 18G 1010 BRN 18IN ST2
CBL 16GA 7COND
CBL 16GA 7COND
LC IEC SJT 10A/125V 6FT
TF 6-32X3/8 PHP BLKZC
MCH 4-40X1/4 BTNSKT BLKOX
MCH 10-32X3/8 PHP BLKZC
MCH 6-32X5/8 FILPHP CLRZC
SEMS 6-32X1/4 PHP BLKZC
SEMS 6-32X3/8 PHP BLKZC
SEMS 6-32X1/2 PHP BLKZC
MCH 10-32X3/8 FIL PHL CLR
MCH 6-32X3/8 FIL PHL CLR
PEMNUT 6-32 .030 STL
PEMNUT 6-32 .038 STL
PEMNUT 6-32 .038 STL
PEMNUT 6-32 .038 STL
PEMNUT 6-32 .054 STL
KEPNUT 6-32
NUT LOCK 10-32
STDF 6-32X.125L STL PEM
STDF 6-32X.375L STL PEM
STDF 6-32X.812L STL PEM
WASH FLAT NO.6 ZC
LUG NO.6 SOLDER STAR
LUG NO.6 SOLDER STAR
THERMAL JOINT COMPOUND
ADHESIVE INDSTRL 3M 4799
TYRAP 8IN BLK
FAN 80MM 12VDC
BAG POLY 12 X 18 2MIL
BAG POLY 20 X 7 X 24 4MIL
BOX SR40/56.8 PWR SPLY
INST TOP SR40.8 PWR SPLY
INST BOTTOM SR40.8 PS
INST CORD SR40.8 PS
OWN MNL - SR40.8 PS
PART #
830-015-00
840-024-00
840-065-00
DESCRIPTION
REG & WARR CARD - SR40.8
LBL DATE CODE
LBL SN SR40/56 PS AE
PART PREFIX LEGEND
040- Cables
055- Finished PCB Assys
100- Pots and Resistors
200- Capacitors
300- Semiconductors
400- Jacks/Connectors
500- Switches
510- Fuses
550- Chassis Metal
600- Transformers
601- Inductors
610- Wires and Cables
640- AC Line Cords
700- Hardware
760- Knobs/Plastic
770- Fans
790- Misc./Packing
800- Printed Material
860- EPROM
47
CONNECTOR PINOUT AND LOCATION
SR40•8 CHANNEL PCB CONNECTOR LOCATIONS
J1
J3
J2
J4
J8
MO N O C H A N N E L PC B
055-0 67-00
C O MP O N EN T SID E
J7
J6
48
J5
SR40•8 CHANNEL PCB CONNECTOR PINOUT
J1
J3
J8
CONNECTS TO POD PCB P1
40 PIN CABLE 040-093-00
CONNECTS TO METER PCB J1
10 PIN CABLE 040-103-00
CONNECTS TO POD PCB J2
10 PIN CABLE 040-102-00
CH 1 MTR
CH 3 MTR
CH 5 MTR
CH 7 MTR
GND
CH 1 DIR
CH 3 DIR
CH 5 DIR
CH 7 DIR
NC
CH 1 IN +
CH 1 GROUND
CH 1 GROUND
CH 1 RETURN +
CH 1 48V
CH 2 IN +
CH 2 GROUND
CH 2 GROUND
CH 2 RETURN +
1
3
5
7
9
11
13
15
17
2
4
6
8
10
12
14
16
18
CH 1 IN CH 1 PHANTOM
CH 1 RETURN CH 1 SEND
CH 1 GROUND
CH 2 IN CH 2 PHANTOM
CH 2 RETURN CH 2 SEND
CH 2 48V
CH 3 IN +
CH 3 GROUND
CH 3 GROUND
CH 3 RETURN +
CH 3 48V
19
21
23
25
27
29
20
22
24
26
28
30
CH 2 GROUND
CH 3 IN CH 3 PHANTOM
CH 3 RETURN CH 3 SEND
POS 16V
CH 4 IN +
CH 4 GROUND
CH 4 GROUND
CH 4 RETURN +
CH 4 48V
31
33
35
37
39
32
34
36
38
40
CH 4 IN CH 4 PHANTOM
CH 4 RETURN CH 4 SEND
POS 16V
1
3
5
7
9
2
4
6
8
10
AUX 1
AUX 1 GND
AUX 2 GND
AUX 3
AUX 3 GND
AUX 4 GND
AUX 5
AUX 5 GND
AUX 6 GND
1
3
5
7
9
11
13
15
17
2
4
6
8
10
12
14
16
18
AUX 1 GND
AUX 2
AUX 2 GND
AUX 3 GND
AUX 4
AUX 4 GND
AUX 5 GND
AUX 6
AUX 6 GND
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
CH 5 IN CH 5 PHANTOM
CH 5 RETURN CH 5 SEND
CH 5 GROUND
CH 6 IN CH 6 PHANTOM
CH 6 RETURN CH 6 SEND
CH 6 GROUND
CH 7 IN CH 7 PHANTOM
CH 7 RETURN CH 7 SEND
NEG 16V
CH 8 IN CH 8 PHANTOM
CH 8 RETURN CH 8 SEND
NEG 16V
2
4
6
8
10
CH 2 DIR
CH 4 DIR
CH 6 DIR
CH 8 DIR
NC
J7
MUTE BUS IN
LED DATA IN
SW DATA OUT
FET DATA IN
CLOCK
1
3
5
7
2
4
6
8
P-CLK IN 9
GND 11
GND 13
LOAD LED
LOAD SW
LOAD FET
5V
10 5V
12 5V
14 5V
20 AUX 7 GND
22 AUX 8
24 AUX 8 GND
J6
CONNECTS TO POD PCB P2
40 PIN CABLE 040-093-00
CH 5 IN +
CH 5 GROUND
CH 5 GROUND
CH 5 RETURN +
CH 5 48V
CH 6 IN +
CH 6 GROUND
CH 6 GROUND
CH 6 RETURN +
CH 6 48V
CH 7 IN +
CH 7 GROUND
CH 7 GROUND
CH 7 RETURN +
CH 7 48V
CH 8 IN +
CH 8 GROUND
CH 8 GROUND
CH 8 RETURN +
CH 8 48V
1
3
5
7
9
J4
AUX SEND BUS
40 PIN CABLE 040-093-00
AUX 7 19
AUX 7 GND 21
AUX 8 GND 23
J2
CH 2 MTR
CH 4 MTR
CH 6 MTR
CH 8 MTR
MTRCTL
MUTE BUS OUT
J5
MAIN BUS
50 PIN CABLE 040-092-00
SUB 1 +
GND
1
3
2 SUB 1 4 SUB 2 +
SUB 2 SUB 3 +
GND
5
7
9
6 GND
8 SUB 3 10 SUB 4 +
SUB 4 SUB 5 +
GND
SUB 6 SUB 7 +
GND
SUB 8 LEFT +
GND
RIGHT CENTER +
GND
PFL SOLO L +
GND
SOLO R GND
GND
GND
SOLO CNTRL
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
GND
SUB 5 SUB 6 +
GND
SUB 7 SUB 8 +
GND
LEFT RIGHT +
GND
CENTER PFL +
GND
SOLO L SOLO R +
GND
GND
GND
GND
FLASH
LED DATA OUT 1
SW DATA IN 3
FET DATA OUT 5
CLOCK 7
P-CLK OUT 9
GND 11
GND 13
2
4
6
8
10
12
14
LOAD LED
LOAD SW
LOAD FET
5V
5V
5V
5V
MUTE BUS CABLES
14 PIN 2IN, 040-133-01
14 PIN 16IN, 040-133-02
14 PIN 30IN, 040-133-00
49
SR40•8 STEREO CHANNEL PCB CONNECTOR LOCATIONS
J3
J1
J4
ST ER EO C H A N N EL P C B
055-0 67-00
C O MP O N EN T SID E
J7
J6
50
J5
SR40•8 STEREO CHANNEL PCB CONNECTOR LOCATIONS
J1
J5
CONNECTS TO POD PCB J11
40 PIN CABLE 040-099-00
MAIN BUS
50 PIN CABLE 040-092-00
A1 LEFT + 1
A1 LEFT GND 3
A1 RIGHT - 5
A2 LEFT + 7
A2 LEFT GND 9
A2 RIGHT - 11
A3 LEFT + 13
A3 LEFT GND 15
A3 RIGHT - 17
A4 LEFT +
A4 LEFT GND
A4 RIGHT +16V
19
21
23
25
2
4
6
8
10
12
14
16
A1 LEFT A1 RIGHT +
A1 RIGHT GND
A2 LEFT A2 RIGHT +
A2 RIGHT GND
A3 LEFT A3 RIGHT +
18 A3 RIGHT GND
20
22
24
26
A4 LEFT A4 RIGHT +
A4 RIGHT GND
-16V
J3
CONNECTS TO METER PCB J203
10 PIN CABLE 040-103-00
A1 LEFT
A2 LEFT
A3 LEFT
A4 LEFT
GND
1
3
5
7
9
2
4
6
8
10
A1 RIGHT
A2 RIGHT
A3 RIGHT
A4 RIGHT
MTRCTL
SUB 1 +
GND
1
3
2 SUB 1 4 SUB 2 +
SUB 2 SUB 3 +
GND
5
7
9
6 GND
8 SUB 3 10 SUB 4 +
SUB 4 SUB 5 +
GND
SUB 6 SUB 7 +
GND
SUB 8 LEFT +
GND
RIGHT CENTER +
GND
PFL SOLO L +
GND
SOLO R GND
GND
GND
SOLO CNTRL
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
GND
SUB 5 SUB 6 +
GND
SUB 7 SUB 8 +
GND
LEFT RIGHT +
GND
CENTER PFL +
GND
SOLO L SOLO R +
GND
GND
GND
GND
FLASH
J6
MUTE BUS OUT
J4
AUX SEND BUS
40 PIN CABLE 040-093-00
AUX 1
AUX 1 GND
AUX 2 GND
AUX 3
AUX 3 GND
AUX 4 GND
AUX 5
AUX 5 GND
AUX 6 GND
1
3
5
7
9
11
13
15
17
AUX 7 19
AUX 7 GND 21
AUX 8 GND 23
2
4
6
8
10
12
14
16
18
AUX 1 GND
AUX 2
AUX 2 GND
AUX 3 GND
AUX 4
AUX 4 GND
AUX 5 GND
AUX 6
AUX 6 GND
20 AUX 7 GND
22 AUX 8
24 AUX 8 GND
LED DATA OUT 1
SW DATA IN 3
FET DATA OUT 5
CLOCK 7
P-CLK OUT 9
GND 11
GND 13
2
4
6
8
10
12
14
LOAD LED
LOAD SW
LOAD FET
5V
5V
5V
5V
J7
MUTE BUS IN
LED DATA IN
SW DATA OUT
FET DATA IN
CLOCK
1
3
5
7
P-CLK IN 9
GND 11
GND 13
2
4
6
8
LOAD LED
LOAD SW
LOAD FET
5V
10 5V
12 5V
14 5V
51
SR40•8 MASTER PCB CONNECTOR LOCATIONS / PINOUT
J1 8
J9
J1
J8
J1 0
CONNECTS TO POD PCB J2
41 PIN CABLE 040-097-00
J1 3
J4
J1 4
SUB 1 OUT
1
2 SUB 2 OUT
SUB 3 OUT
3
4 SUB 4 OUT
SUB 5 OUT
5
6 SUB 6 OUT
SUB 7 OUT
7
8 SUB 8 OUT
SUB 1 SEND
9
10 SUB 2 SEND
SUB 3 SEND 11
12 SUB 4 SEND
SUB 5 SEND 13
14 SUB 6 SEND
SUB 7 SEND 15
16 SUB 8 SEND
GND 17
18 SUB 1 RET +
SUB 1 RET - 19
J1 5
J1 701
22 SUB 2 RET -
GND 23
24 SUB 3 RET +
SUB 3 RET - 25
J1
SUB 4 RET + 27
GND 29
SUB 5 RET - 31
J1 7
J3
MA ST ER PCB
05 5-074-00
20 GND
SUB 2 RET + 21
26 GND
28 SUB 4 RET30 SUB 5 RET +
32 GND
SUB 6 RET + 33
34 SUB 6 RET -
GND 35
36 SUB 7 RET +
SUB 7 RET - 37
38 GND
SUB 8 RET + 39
40 SUB 8 RET -
J12
CO MP ON EN T SI DE
J1 6
J2
CONNECTS TO POD PCB J3
35 PIN CABLE 040-098-00
J2
J1 201
J5
LEFT SEND
1
CENTER SEND
3
4 GND
LEFT RTN +
5
6 LEFT IRTN -
GND
7
8 RIGHT RTN +
RIGHT RTN -
9
10 GND
CENTER RTN + 11
12 CENTER RTN -
GND 13
14 PHONE 2 LEFT
PHONE 2 RIGHT 15
PHONE R SEND
18 GND
PHONE L RETURN 19
20 GND
GND 23
LEFT MONITOR OUT 25
J13
TALKB. EXTERNAL
27
REAR XLR + 29
J10
1
18
2
GND
-18
1
12V
3
2
LAMP CNTRL
4
AUX SEND GND
5
48
GND 31
ICOM XLR (2)
J12
52
1
18
2
GND
3
-18
1
FRONT XLR +
1
N/C
4
AUX SEND GND
2
FRONT XLR -
2
PHONE 1 LEFT
5
48
3
GND
3
PHONE 1 RIGHT
J1701
J1201
16 PHONE L SEND
17
PHONE R RETURN 21
POWER DISTRIBUTION
2 RIGHT SEND
33
22 N/C
24 GND
26 RIGHT MONITOR OUT
28 GND
30 REAR XLR 32 ICOM XLR (1)
34 ICOM XLR (3)
SR40•8 MASTER PCB CONNECTOR PINOUT
J3
J8
J16
CONNECTS TO METER PCB J102
CONNECTS TO POD PCB J8
CONNECTS TO DIGI PCB J16
14 PIN CABLE 040-106-00
34 PIN CABLE 040-104-00
20 PIN CABLE 040-062-02
SUB 1 METER
1
2 SUB 2 METER
LEFT OUT
1
2 RIGHT OUT
5V
1
2 5V
SUB 3 METER
3
4 SUB 4 METER
CENTER OUT
3
4 MATRIX A OUT
SUB 8 LED DATA
3
4 SUB 8 SW DATA
SUB 5 METER
5
6 SUB 6 METER
MATRIX B OUT
5
6 MATRIX C OUT
SUB 7 LED DATA
5
6 SUB 7 SW DATA
SUB 7 METER
7
8 SUB 8 METER
MATRIX D OUT
7
8 GND
SUB 6 LED DATA
7
8 SUB 6 SW DATA
GND
9
10 LEFT METER
MATRIX A IN +
9
10 MATRIX A IN -
SUB 5 LED DATA
9
10 SUB 5 SW DATA
11
12 MATRIX B IN +
SUB 4 LED DATA
11
12 SUB 4 SW DATA
13 14 GND
MATRIX C IN + 15 16 MATRIX C IN -
SUB 3 LED DATA
RIGHT METER 11
MTRDIM 13
12 CENTER METER
14 MTRCTL
J4 / J14
AUX SEND BUS
40 PIN CABLE 040-093-00
GND
MATRIX B IN -
GND 17
MATRIX D IN - 19
TAPE A LEFT IN + 21
GND 23
TAPE A RIGHT IN - 25
AUX 1
1
2 AUX 1 GND
AUX 1 GND
3
4 AUX 2
AUX 2 GND
5
6 AUX 2 GND
AUX 3
7
8 AUX 3 GND
AUX 3 GND
9
10 AUX 4
TAPE B LEFT IN + 27
GND 29
TAPE B RIGHT IN - 31
N/C 33
18 MATRIX D IN +
20 GND
13 14 SUB 3 SW DATA
SUB 2 LED DATA 15 16 SUB 2 SW DATA
SUB 1 LED DATA 17
GND 19
18 SUB 1 SW DATA
20 GND
22 TAPE A LEFT IN 24 TAPE A RIGHT IN +
26 GND
28 TAPE B LEFT IN 30 TAPE B RIGHT IN +
32 GND
34 N/C
AUX 4 GND 11
12 AUX 4 GND
J17
AUX 5
14 AUX 5 GND
CONNECTS TO DIGI PCB J17
13
AUX 5 GND 15
16 AUX 6
AUX 6 GND 17
18 AUX 6 GND
AUX 7
19
20 AUX 7 GND
AUX 7 GND 21
22 AUX 8
AUX 8 GND 23
24 AUX 8 GND
J5
MAIN BUS
50 PIN CABLE 040-092-00
SUB 1 +
1
2 SUB 1 -
GND
3
4 SUB 2 +
6 GND
SUB 2 -
5
SUB 3 +
7
8 SUB 3 -
GND
9
10 SUB 4 +
SUB 4 - 11
12 GND
SUB 5 + 13
14 SUB 5 -
GND 15
16 SUB 6 +
SUB 6 - 17
18 GND
SUB 7 + 19
20 SUB 7 -
GND 21
SUB 8 - 23
LEFT + 25
GND 27
RIGHT - 29
CENTER + 31
GND 33
PFL - 35
SOLO L + 37
GND 39
22 SUB 8 +
20 PIN CABLE 040-062-03
J9
CONNECTS TO POD PCB J9
34 PIN CABLE 040-105-00
AUX 1 OUT
1
2 AUX 2 OUT
AUX 3 OUT
3
4 AUX 4 OUT
AUX 5 OUT
5
6 AUX 6 OUT
AUX 7 OUT
7
8 AUX 8 OUT
GND
9
10 B1 LEFT +
11
12 GND
AUX B1 LEFT AUX B1 RIGHT +
13 14 AUX B1 RIGHT GND 15 16 AUX B2 LEFT +
AUX B2 LEFT - 17
AUX B2 RIGHT + 19
GND 21
AUX B3 LEFT - 23
AUX B3 RIGHT + 25
GND 27
AUX B4 LEFT - 29
AUX B4 RIGHT + 31
GND 33
5V
1
2 GND
5V
3
4 GND
MTRX D SW DATA
5
6 MTRX D LED DATA
MTRX D MUTE
7
8 MTRX C MUTE
MTRX C SW DATA
9
10 MTRX C LED DATA
MTRX B SW DATA
11
12 MTRX B LED DATA
MTRX B MUTE
13
14 MTRX A MUTE
MTRX A SW DATA 15
16 MTRX A LED DATA
SOLO CLK 17
18 N/C
N/C 19
20 N/C
18 GND
20 AUX B2 RIGHT 22 AUX B3 LEFT +
24 GND
26 AUX B3 RIGHT 28 AUX B4 LEFT +
30 GND
32 AUX B4 RIGHT 34 GND
J18
CONNECTS TO DIGI PCB J18
26 PIN CABLE 040-099-01
24 GND
GND
1
2 5V
28 RIGHT +
26 LEFT -
AUX 1 LED DATA
3
4 AUX 1 SW DATA
30 GND
AUX 2 LED DATA
5
6 AUX 2 SW DATA
AUX 1 MUTE
7
8 AUX 2 MUTE
32 CENTER 34 PFL +
J15
AUX 4 LED DATA
9
10 AUX 4 SW DATA
36 GND
CONNECTS TO DIGI PCB 15
AUX 5 LED DATA
11
12 AUX 5 SW DATA
38 SOLO L -
10 PIN CABLE 040-095-00
40 SOLO R +
AUX 5 MUTE
13 14 AUX 6 MUTE
AUX 6 LED DATA 15 16 AUX 6 SW DATA
SOLO R - 41
42 GND
GND
1
2 SUB 8 MUTE
GND 43
44 GND
SUB 1 MUTE
3
4 SUB 7 MUTE
GND 45
46 GND
SUB 2 MUTE
5
6 SUB 6 MUTE
AUX 7 LED DATA
21
GND 47
48 GND
SUB 3 MUTE
7
8 SUB 5 MUTE
AUX 8 LED DATA
23
24 AUX 8 SW DATA
50 FLASH
SUB 4 MUTE
9
10 5V
AUX 7 MUTE
25
26 AUX 8 MUTE
SOLO CNTRL 49
AUX 3 LED DATA
17
AUX 3 MUTE 19
18 AUX 3 SW DATA
20 AUX 4 MUTE
22 AUX 7 SW DATA
53
SCHEMATICS / PCB LAYOUTS
The remainder of this manual contains schematics and PCB layouts for the SR40•8.
Documents are organized in numeric order by Mackie part #. The schematics and PCB
layouts are placed as close together as possible to reduce “page flipping fatigue
syndrome”
Click on any board to open that page
SR40•8 Circuit Boards
Part #
Description
055-067-00
055-068-00
055-069-00
055-070-00
055-071-00
055-073-00
055-074-00
055-075-00
Channel PCB
Mute Control PCB
Channel Meter PCB
Mono Pod (channel) PCB
Stereo Channel (main aux) PCB
Master Pod PCB
Master (output) PCB
Mute Switch PCB
055-076-00
055-077-00
055-078-00
055-101-00
Master Meter PCB
Power Distribution PCB
Power Supply PCB
Output Digital PCB
ALL BOARDS
For simplicity (and to save a few trees) step & repeated schematic sheets are omitted.
On the SR40•8 component designators are stepped by 200 (R107 on ch 1 = R307 on ch
2 = R507 on ch 3, etc).
NOTE: 055-067-00 is the ch board for the 40.8 only. The 56.8 uses 055-188-00
Omitted Schematic Sheets
PCB
Sheets Omitted
Channel
3-16, channels 2-8
Mono Pod
2-8, channels 2-8
Stereo Ch’s
3-8, main aux returns 2, 3, and 4
Master Section 2-8, aux sends/sub 2-8
54
Refer To Sheet(s)
1-2, channel 1
1, channel 1
1-2, main aua rtn 1
1, aux send/sub 1
SPEAKING MACKIE-EESE
Some of the terminology and labeling used in the SR40•8 schematics may be confusing (or at least illogical) to those new to servicing Mackie products. Here are a few
explanations.
•
“Mono Pod “ and “Master Pod” refer to the circuit boards at the rear of the console
containing most of the jacks. “Pod” is a term that comes form the original CR-1604
detachable rotopod. Ever since, Mackie has referred to mixer PCBs that contain
jacks as the “pod” regardless of whether or not they actually detach.
•
Like expectant parents, Mackie engineers couldn’t decide on just one name for
some of the SR40•8’s features. So to alleviate any confusion, “Stereo Channel” and
“Main Aux Returns” are one and the same.
•
The “Master Section” is sometimes referred to as the “Output Section”.
•
The “Output Digital” PCB contains the Master section’s Ultramute shift registers. It is
not directly involved in outputting any external digital communications.
FINAL NOTES
The hard working Mackie engineering department is on a neverending quest to
improve product designs. Therefore, the infromation in this manual is subject to change
without notice.
At Mackie Designs we strive for unparalleled technical support for our products. We
welcome any feedback.
This manual was created by Jay Tannenhaus on an indestructible KIWI laptop
computer. Jay would like to thank the rest of the Mackie alpine snowbaord team for
their help.
55
THE MIXER FIXER • MACKIE DESIGNS SERVICE NEWS
SR 40•8 +12V Power Supply Fuse Upgrade:
Model:
SR40/56•8 440W Power supplys
Serial #:
Prior to SN#AD14392
Symptom:
No +12V Power LED’s or no power to the Little Light outlets.
Solution:
Replace F8 (1.6A Fuse) with a 3.15A 5X20MM 250V (Part # 510-026-00).
Effective 4/20/98
SR40•8 +12V Fuse Upgrade BC 4/20/98
THE MIXER FIXER • MACKIE DESIGNS SERVICE NEWS
SR 40•8 5-Volt Filter Capacitor
Model:
SR40•8
Serial #:
Prior to SN # AD14392
Symptom:
No symptoms, just improved supply filtering.
Solution:
Install one 47uf 25V cap (part #220-002-00) per each Mono Channel PCB’s
(055-067-00). Solder the positive of leg of the cap to the 5V rail. Solder the
negative leg to ground. (As shown below)
Effective 8/11/97
+
47uf 25v
220-002-00
Back side of
Mono
Channel PCB
(055-067-00)
SR40•8 5-Volt Filter cap BC 8/13/97
THE MIXER FIXER • MACKIE DESIGNS SERVICE NEWS
SR 40•8 Clock Jumper
Model:
SR40•8
Serial #:
Prior to SN#AD14392
Symptom:
Digital clock noise in the PFL Solo bus.
Solution:
On the Mono Channel PCB cut and jump the trace pictured in Fig. 1
Effective 6/1/97
Mono Channel PCB
Part #055-067-00
Fig. 1
SR40•8 Clock Jumper BC 7/1/97
THE MIXER FIXER • MACKIE DESIGNS SERVICE NEWS
SR 40•8 Solo Clock Noise
Model:
SR40•8
Serial #:
Prior to SN# AD14392
Symptom:
Digital clock noise in the PFL Solo bus.
Solution:
On the Ch1-8 Channel PCB replace the add-on resistor (backside, 36kohms)
to ground with a 50K pot (part# 130-015-00). Monitor the Solo bus in the PFL
mode and adjust the pot for minimum (null) clock noise.
J6
Old Circuit
1M
Effective 5/8/97
1
J6
New Circuit
20pf
1M
Solo PFL
1
20pf
Solo PFL
36K
50K
J6
20pf
1M
111
50K trim pot
Pin 1 unused
2
1
3
SR40•8 Mono Channel PCB,
(Ch1-8 backside)
055-067-00
THE MIXER FIXER • MACKIE DESIGNS SERVICE NEWS
SR 40•8 Digital Output PCB Clock Noise Mod
Model:
SR40•8
Serial #:
Prior to SN# AD14392
Symptom:
Clock noise in PFL bus.
Solution:
Remove 220Ω SMT resistor, R7, and replace with an SMT
zeroΩ link, part# 145-000-00.
Effective 7/1/97
Digital output PCB part #055-101-00
Replace R7 with zeroΩ link
SR40•8 Digtal output pcb clock noise mod BC 8/5/97
THE MIXER FIXER • MACKIE DESIGNS SERVICE NEWS
SR 40•8 Power Supply Diode Failure
Model:
SR40 •8 PSU (Power supply unit)
Serial #:
Not available. Very early production, probably only 10-20
Effective 6/1/97
Symptom:
Rectifier diodes D5 and D6 Fail. Main fuse may fail.
Solution:
Replace diodes D5, D6, D7, and D8 with part type FES8DT (part# 300-006-00)
which has a higher current rating.
PSU PCB Part #055-078-00
SR40•8 Power supply diode failure BC 4/21/97
MACKIE DESIGNS INC.,16220 Wood-Red Road NE, Woodinville, WA 98072
Phone 800/258-6883, Service Fax 206/402-7833, General Fax 206/487-4337
7/11/97
To:
Mackie Designs Authorized Warranty Service Centers
Subject:
SR40•8 upgrade kit. (Prior to SN #AD14392)
Dear Service Centers,
Mackie Designs has recently created an upgrade kit for the SR40•8 Large
Format Mixer. We have created a Mixer Fixer for each upgrade.
On all SR 40•8 consoles that come in for service with serial number prior to
AD14392 the following updates must be done.
1. Replace all five Mono Pod PCB’s. (Part #055-070-00)
2. Replace the Master PCB. (Part #055-073-00)
3. Update the EPROM to Ver. 1.3. (Part #080-022-00)
4. Install Mixer Fixer SR 40•8 ULTRA MUTE Timing Error.
5. Install Mixer Fixer SR 40•8 Solo Clock Noise.
6. Install Mixer Fixer Control PCB Resistor.
7. Install Mixer Fixer 5-Volt Filter Cap.
8. Install Mixer Fixer SR40•8 Solo LED failure (SN #AD14976)
9. Install Mixer Fixer SR 40•8 Clock Jumper.
10. Install Mixer Fixer SR 40•8 Matrix Crosstalk
11. Check the power supply for Mixer Fixer. (Power supply rectifier diode)
Sincerely,
Mackie Designs Inc.
THE MIXER FIXER • MACKIE DESIGNS SERVICE NEWS
SR 40 •8 ULTRA MUTE Timing Error
Model:
SR40•8
Serial #:
Prior to SN# AD14298
Symptom:
Muting FETs don’t always follow mute LEDs when recalling snapshots.
Solution:
Install modification PCB 055-155-00 and ribbon cable assembly
040-133-00/ 055-155-00.
To install modification PCB 055-155-00 (see Figures 1& 2):
1. Remove the bottom panel from the SR40•8 (requires a Phillips head screwdriver).
2. Unplug the 50-pin cable from the Mono (CH17-24) PCB.
3. Unplug the 3" 14-pin cable interconnecting the A1-A4 and Mono (CH17-24) PCBs.
4. Replace the cable with the -155 modification PCB. Be sure to install the assembly so the
red stripe on the cable is towards the top when the armrest of the mixer is closest to you.
Effective 6/1/97
5. Reinstall the 50-pin cable into the connector on the Mono (CH17-24) PCB.
To install the 040-133-00/055-155-00 ribbon cable assembly:
1. Remove ribbon cable# 040-133-00, which connects the digital output board (055-101-00)
to the channel 33-40 channel board.
2. Install the ribbon cable assembly which we have supplied. Connect the short cable to
connector J6 on the digital output board and the long cable to connector J7 on the
channel 33-40 channel board.
3. Use a cable tie to tie the 055-155-00 PCB to cable# 040-062-03 to keep it in place.
4. Reinstall the bottom cover.
Fig. 1
Side View
Fig. 2
Top View
A1-A4
PCB
055-155-00
PCB
Red
Stripe
Cable Tie
A1-A4
PCB
CH 17-24
PCB
Remove and
Discard ribbon cable
CH 17-24
PCB
Install
055-155-00
PCB
50 pin cable
SR40•8 Timing Error BC 7/1/97