Go To Bulletins
SRM450
Powered Speaker
SERVICE MANUAL
1999,2000 MACKIE DESIGNS, INC.
820-184-00
Page 3 is interactive
SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY
EXPERIENCED REPAIR TECHNICIANS ONLY
2
CONTENTS
Introduction ..................................................................... 3
Block diagram .................................................................. 4
Specifications ................................................................... 5
Overview .......................................................................... 6
Safety test ........................................................................ 8
Bias adjustment ............................................................... 9
Test points ......................................................................... 10
Parts ................................................................................... A-1
Fold-out Sections
Schematics and PCB layouts
Main board ................................................................. 227-1
Click on any item to open that page
INTRODUCTION
SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY
EXPERIENCED REPAIR TECHNICIANS ONLY
This manual contains basic service information. It is essential that you have a copy of the
user’s manual as this contains the complete operating instructions.
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.
3
4
THRU
INPUT
1
1
SIGNAL
SENSE
TIMED
TURNOFF
+
LO VDC
Ð
+
MID VDC
Ð
HI-PASS
HI-FREQ
COMPRESSOR
THRESHOLD
176uS
LPF
THRESHOLD
40-120 Hz DELAY LO-PASSCOMPRESSOR
+
HI VDC
Ð
SWEEPING
FILTER
MUTE
THERMAL POWER
LED
LEDS
CONTOUR
MUTE
ON/OFF
LOW AC
VOLTS SENSE CONTROL
THERMAL
SWITCH
LOW CUT
TOROIDAL POWER
TRANSFORMER
POWER
SWITCH
ON
OFF
FUSE
+15VDC
SIGNAL
SENSE
SIGNAL
LED
J15
Block Diagram
PEAK
LIGHT
TWEET
SENSE
RESISTOR
WOOF
LO-FREQUENCY
DRIVER
PEAK
DETECTION
BASS CONTROL SERVO LOOP
LO-FREQ
AMP
MUTE
HI-FREQ
AMP
THRESHOLD
Specifications
Low-Frequency Transducer
System specs
Diameter
Voice Coil Diameter
Sensitivity (1W@1m)
Nominal Impedance
Power Handling
Frequency Range
Input Type
Input Impedance
Input Protection
Sensitivity
300mm (12”)
63.5mm (2.5”)
98 dB
8 ohms
300W
50Hz – 3000Hz
High-Freq Driver and Horn
Diaphragm Diameter
Exit Throat Diameter
Diaphragm Material
Sensitivity (1W@1m)
Nominal Impedance
Power Handling
Frequency Range
44.5mm (1.75”)
24.5mm (1”)
Titanium
106 dB
8 ohms
150W
1000Hz – 20,000Hz
Low-Freq Power Amplifier
Rated Power
Rated THD
Cooling:
Design:
300 watts
< 0.1%
Convection Extrusion
Class G, Parametric Servo
Feedback
High-Freq Power Amplifier
Rated Power
Rated THD
Cooling:
Design:
100 watts
< 0.1%
Convection Extrusion
Conventional Class AB
Balanced Differential
Line: 20k ohms
RFI and level protected
Line: +4 dBu (centered)
Mic: –36 dBu
Maximum Input Level
Line: +22 dBu
Low-Cut Frequency
75Hz, Second-order filter
EQ
Peaking +3 dB @ 55Hz,
+3 dB @ 20kHz
Over-Excursion Protection
Second-Order High-Pass
Filter
Thermal Protection
Amplifier shutdown, autoreset
Low-Line Voltage Shut Down: 60% Nominal line
Acoustic Freq Response: 45Hz – 20,000Hz
Low-Freq –3 dB Point:
55Hz
Maximum SPL @ 1m:
123 dB
Low-Freq Crossover:
24 dB/octave, time offset
corrected
High-Freq Crossover:
24 dB/octave
Crossover Frequency:
1600Hz
Driver Protection
Independent LF and HF
compressors
Low-Freq Roll-Off:
Dynamic-signal level dependent
Accessory Interface
±15V DC
Operating Temp Range –10ºC - 45ºC (14ºF - 113ºF)
Line Input Power
US
Europe
Japan
120V, 60Hz
230V, 50Hz
100V, 50/60Hz
Disclaimer
Since we are always striving to make our products
better by incorporating new and improved materials, components, and manufacturing methods, we
reserve the right to change these specifications at
any time without notice.
©1999 Mackie Designs Inc.
All Rights Reserved.
5
Overview
The SRM450 is an active two-way loudspeaker system capable of extremely high sound
pressure levels.
The Transducers
The SRM450 active monitors feature a 12” high-power low-frequency woofer and a 1.75”
titanium diaphragm high-output precision compression driver. This high
frequency driver is mounted on an acoustically non-resonant exponential waveguide,
providing a wide, controlled dispersion and precise reproduction of the critical upper
mid-range and high frequencies. The result is an unbelievably smooth off-axis response
that allows everyone in the audience to experience the same high-resolution audio no
matter where they are seated.
Each driver has been specifically designed by our engineers for optimum performance in
the lightweight high-strength cabinet.
FR Series Power Amplifiers
To power these beautiful things, each SRM450 includes two of our acclaimed FR Series
“Fast Recovery” power amplifiers. Our exclusive design uses low negative feedback, yet
allows the amplifiers to maintain low distortion and stability and to quickly recover when
driven into clipping.
•
The amplifiers include the following features:
The low-frequency amplifier produces up to 540 watts peak (300 continuous)
before clipping.
•
The high-frequency amplifier produces up to 150 watts peak (100 continuous)
before clipping.
•
Each amplifier has its own compressor circuit that acts when the input signal is large
enough to cause clipping, distortion and excessive voice coil heat. The compressor will
automatically decrease the input signal to a safe level. The compressor in the lowfrequency amp works independently from that in the high-frequency amp.
•
The low-frequency amp uses a servo feedback loop which senses the current flowing in
the woofer coil. This controls the low-frequency response and maintains low distortion at
high output levels.
•
The low-frequency amplifier also has a sweeping filter. This will automatically move the
low cut-off frequency up or down depending on the amplifier output. For example, if the
amplifier is below clipping, the low-frequency cut-off point is 55Hz. As it approaches
clipping, this shifts up smoothly to 120Hz, providing more power reserves and less
distortion before clipping. This happens quickly and continuously, protecting the amplifer
and the woofer and reducing any noticable distortion.
Warning: Although the amplifiers have these protection circuits, you must still make sure
the PEAK light is not blinking often or continuously. If it is, turn down your mixer faders, or
preamplifier gain, or turn down the SRM450 LEVEL control.
6
The Crossover
The built-in electronic crossover is a 24 dB/octave Linkwitz-Riley design.
Although more expensive than other crossover designs, the benefits provided by the
Linkwitz-Riley design have been well documented. These benefits include:
•
Absolutely flat frequency response throughout the bandpass, without the characteristic
ripple near the crossover point exhibited by other designs.
•
The sharp 24 dB per octave roll-off of the filters ensures that the transducers aren’t
reproducing frequencies outside of their capabilities.
•
The acoustic sum of the two driver responses is unity at the crossover frequency, resulting
in perfect power response.
•
Our heroic engineers have worked carefully to ensure that the SRM450 also provides
perfect phase response. This diligence has yielded phenomenal accuracy, even if you are
standing 20 feet away.
The Cabinet
The SRM450 cabinet was designed to be the strongest molded composite cabinet on the
planet. This material is as strong as concrete, and rigid enough to prevent unwanted
vibrations in the cabinet. It has built-in fly points for hanging, and a socket in the bottom
for mounting on a tripod stand. Although it is an exceptional choice for installed sound
situations, its light weight and durable finish also make it ideal for portable sound system
use. The asymmetrical trapezoidal design of the cabinet makes it easy to use as a floor
wedge for stage monitor applications.
7
Safety test
You must perform the following leakage test before returning the unit to your customer.
Take every safety precaution to protect yourself while doing this test.
1. Make a small loading RC circuit as shown in the diagram below, and connect the AC
volt meter between the AC power source ground and any exposed metal on the unit
under test.
2. Connect the unit under test to an AC power source using a ground-lift adaptor, leaving
the unit’s safety ground floating. Turn the unit on.
3. The meter reading should be less than 750mVAC (note: this is equivalent to 0.5mA of
leakage current).
4. Flip the plug over in the receptical so the hot and neutral are swapped.
Verify that the reading is still less then 750mVAC.
5. If either reading is greater than 750mVAC, then you must investigate and repair the unit
before returning it to your customer.
8
Bias adjustment
The Amplifier Bias of every SRM450 must be carefully adjusted as follows.
1. Place the SRM450 on its side so that the heatsink fins are horizontal.
2. Connect the power cord and turn it on, with no input
signal applied. Make sure that the TIMED TURNOFF switch is
OFF.
3. Let it sit this way for an hour or more to allow the heatsink
temperature to rise. You can play music through to speed
things up. If you have a thermometer, the bias adjustment
procedure is best done when the heatsink temperature is 45 to
50 deg C.
4. Turn off the SRM450 and remove the power cord.
5. Remove the complete amplifier/heatsink assembly from the plastic
speaker case but leave all wires connected, including the speaker wires.
Support the amplifier so it can be safely turned on again.
6. Replace the power cord and turn on the amplifier and take care not to touch any
exposed live AC components.
7. No input signal is applied.
8. Low frequency amplifier bias adjustment:
While the heatsink is still warm, measure the DC voltage across the 2 pins of J21. Adjust
R202 until a reading of 4mV to 4.5mV is reached. See sheet 2 for the location of J21 and
R202.
Important: When finished adjusting, secure R202 with a small drop of paint, such as nail
varnish.
9. High frequency amplifier bias adjustment:
Measure the DC voltage across the 2 pins of J20. Adjust R212 until a reading of 4mV to
4.5mV is reached.
Important: Secure R212 with a small drop of paint.
10. This completes the adjustment procedure. Reassemble and perform a full test.
9
10
HIGH FREQUENCY
BIAS ADJUSTMENT POT
LOW FREQUENCY
BIAS TEST POINT
HIGH FREQUENCY
BIAS TEST POINT
LOW FREQUENCY
BIAS ADJUSTMENT POT
+15 VDC
-15 VDC
+80V
-80V
+45V
-45V
SRM-450 PARTS LIST
Parts
040055100200300400500510550600601610640700760770790800860-
Numbering guide
Cables
Finished PCB Assy
Pots and resistors
Capacitors
Semiconductors
Jacks/Connectors
Switches
Fuses
Chassis Metalwork
Transformers
Inductors
Wires and Cables
AC line cords
Hardware
Knobs/Plastic
Fans
Misc./Packing
Printed Material
EPROM
PART#
DESCRIPTION
PAGES
090-132-xx
Master Parts
A-2
080-136-00 Cabinet subassembly
A-3
055-227-00 Main Board
A-4
Click on any item to open that page
Components noted with this symbol shall be replaced only by the component specified.
This is required to maintain product safety.
A-1
247b
Master Parts List 090-132-xx
PART NO.
DESCRIPTION
REV
QTY NOTES
090-132-00
080-112-00
080-112-01
055-227-00-02
080-137-00
080-138-00
080-138-01
080-138-02
510-013-00
510-011-00
510-024-00
550-398-00
550-460-00
550-488-00
551-071-00
700-010-04
700-010-06
700-011-00
700-028-00
700-034-02
700-113-00
701-016-00
705-001-00
705-005-00
705-018-00
710-005-00
710-017-00
710-024-00
720-007-00
730-001-00
730-025-00
740-001-00
740-003-00
760-018-00
780-052-00
780-111-00
080-136-00
092-903-00
640-002-02
550-397-00
701-021-00
730-035-00
760-115-00
760-116-00
800-139-00
820-158-00
SRM450 120V
SA HTSK/XFMR/BD 12IN SPKR
SA AMP SRM450 230V
PCB ASSY SRM450 AMPLIFIER
SA SW SRM450
SA XFMR 600-034-00
SA XFMR 600-034-01
SA XFMR 600-034-02
FUSE SB 7A 5X20MM 250V
FUSE SB 4A 5X20 250V IEC
FUSE SB 8A 5X20MM 250V
SCRN BACK PNL MAIN SRM450
SHLD M6 PC SRM450
SHLD .015 M6X 4 3/4 ID
PNT EXTR HTSK SRM450
TF 6-32X3/8 PHP BLKZC
TF 6-32X1/2 PHP BLKZC
MCH 4-40X1/4 BTNSKT BLKOX
SEMS 6-32X1/4 PHP BLKZC
SEMS 4-40X3/8 PHP BLKZC
BOLT CAR 5/16-18 2IN STL
5-20X5/16 PHPII TYP B BLK
KEPNUT 6-32
NUT LOCK 4-40
NUT HEX 5/16-18 (GD-5)
WASHER INT STAR NO.6 BLK
WASH SPLTLCK 5/16 HEAVY
WASH FLAT 5/16 HARD (USS)
TAPE DS 30MIL X 1.0W URTH
THERMAL JOINT COMPOUND
LOCTITE 222
TYRAP 3-1/4L
TYRAP 8IN BLK
KNOB 11MM DARK GRAY
INSULATOR PCB SRM450
WASH RUB (W/TRANSFORMER)
SA SRM450 CABINET
LC IEC SJT 1250W 10A/125V
LC JAPAN 12A 125VAC 8FT
PLATE COVER SRM450
6X3/8 PHP PLASTITE BLK
ACTIVATOR NO.2287 NORTON
SIDE HANDLE GRIP SRM450
PLASTIC SIDE HANDLE
SLEEVE SRM450
OWN MNL SRM450
9 A3
B1 A2
A2 A2
2C A2
B
B A1
A A1
A A1
A
B
A
A
A
1 A1
A
A
A
A
B
A
A
A
A
A
A
A
A
A
A
A
A
A
A
B
A
A
A
A
C
A
A
A
A
A
A
A
1
1
1
1
See Page A-4
1
1
For 120V units
1
For 230V units
1
For 100V units
1
For 120V units
1
For 230V units
1
For 100V units
1
1
1
1
9
4
3
8
4
1
4
2
4
1
4
1
1
AR (as required)
AR
AR
1
3
1
1
1
1
See next page (A-3)
1
1
Linecord for 100V units
1
4
AR
2
2
1
1
A-2
Components noted with this symbol shall be replaced only by the component specified.
This is required to maintain product safety.
Cabinet Subassembly 080-136-00
PART NO.
DESCRIPTION
055-280-00
080-156-00
080-157-00
080-158-00
080-159-00
490-025-00
490-042-00
490-047-00
490-048-00
490-052-00
490-053-00
550-408-00
550-410-00
700-123-00
700-124-00
700-125-00
701-021-00
701-026-00
701-027-00
701-028-00
701-029-00
705-031-00
705-032-00
710-049-00
710-050-00
710-051-00
710-052-00
712-068-00
712-069-00
750-015-00
760-115-00
760-116-00
780-135-00
780-138-00
780-139-00
780-140-00
790-010-00
800-141-00
810-088-00
810-089-00
840-249-00
840-250-00
840-251-00
840-314-00
PCB ASSY LED
SA CABLE PCB LED BLK/WHT
SA SUPPORT DRIVER THROAT
SA HARNESS BLU & BLU/BLK
WIRE YEL WOOFER
COMP DRIVER
WOOFER SRM450
SRM FRONT CASE MRB
SRM REAR CASE MRB
POLE MNT KNOB
FOAM D BLK&WHT
TOP HANDLE PA SPKR
GRILL 12IN SPKR ACTIVE
SCREW SIDE HDL GRIP MNTG
SCREW HDL MNTG TO CASE
SCREW WOOFER
6X3/8 PHP PLASTITE BLK
SCREWS FOR CASE
SCREW BACK PANEL
SCREW FEET GRILL CD-THR
SCREW PCB ASSY LED
FLYING HW INS NUTS GALV
FLYING HW INS NUTS BLK
WASH HDL MTNG TO CASE
WASH FLAT WOOFER
FLYING HW INS WASH GALV
FLYING HW INS WASH BLK
FLYING HW INSERTS
GROMMET LEAD WIRE
FEET
SIDE HANDLE GRIP SRM450
PLASTIC SIDE HANDLE
GASKET WOOFER SRM450
FOAM DA COMP DR TO CASE
FOAM D COMP D TO THROAT
GASKET FOR SPEAKER
BAG 20 X 7 X 48 4MIL GUSS
BOX SRM450
CARDBD BTTM SRM450/C300
TRIANG INS SRM450/C300
LBL LOGO SPKR FRONT
LBL LOGO SPKR RUNNING MAN
LBL SPKR PWR ACTIVE
LBL INSERT COVER SRM450
REV
B
A
A
A
A
A
A
A
QTY NOTES
1
1
1
1
1
1
1
1
1
1
1
1
1
4
4
8
4
17
12
13
1
8
2
4
8
8
2
10
1
3
2
2
1
1
1
1
1
1
1
1
1
1
1
10
Comp driver
Woofer
Front case
Rear case
Top handle
Grill
Woofer Gasket
A-3
227c
055-227-00 Main pcb assembly
PART NO.
DESCRIPTION
VALUE
040-311-00
100-084-00
105-464-00
110-025-00
115-361-00
115-364-00
115-389-00
115-418-00
120-097-00
122-081-00
123-009-00
123-056-00
125-030-00
130-021-00
130-038-00
130-078-02
140-025-00
140-042-00
140-049-00
140-066-00
140-073-00
140-080-00
140-097-00
140-112-00
140-115-00
140-119-00
140-123-00
140-147-00
145-162-00
DIS 18GA 1010 GNYL 5 HKLG
RES CF .125W 5% 30K OHM
RES MF .125W 1% 60K4 OHM
RES CF .25W 5% 100 OHM
RES MF .25W 1% 5K11 OHM
RES MF .25W 1% 6K04 OHM
RES MF .25W 1% 10K0 OHM
RESISTOR CF 20K0 1%
RES MO .5W 5% 10K OHM
RES MO 2W 5% 2K2 OHM
RES MO 3W 5% .22 OHM
RES MO 3W 5% 20 OHM
RES WW 5W 5% .22 OHM
POT TRIM 10KB HORIZ
POT TRIM 500B HORIZ
POT 12MM DUAL 10KZD REVLOG
RES TF SM .1W 5% 10 OHM
RES TF SM .1W 5% 51 OHM
RES TF SM .1W 5% 100 OHM
RES TF SM .1W 5% 510 OHM
RES TF SM .1W 5% 1K0 OHM
RES TF SM .1W 5% 2K0 OHM
RES TF SM .1W 5% 10K OHM
RES TF SM .1W 5% 39K OHM
RES TF SM .1W 5% 51K OHM
RES TF SM .1W 5% 75K
RES TF SM .1W 5% 100K OHM
RES TF SM .1W 5% 1M OHM
RES MF SM .1W 1% 47R5 OHM
30K
60K4
100
5K11
6K04
10K0
20K0
10K
2K2
0.22
20
.22
10KB
500-B
10KZD
10
51
100
510
1K0
2K
10K
39K
51K
75K
100K
1M
47R5
5%
1%
5%
1%
1%
1%
1%
5%
5%
5%
5%
5%
145-193-00
145-210-00
145-226-00
145-234-00
145-239-00
RES MF SM .1W 1% 100 OHM
RESISTOR MF SMT
RES MF SM .1W 1% 221 OHM
RES MF SM .1W 1% 267 OHM
RES MF SM .1W 1% 301 OHM
100
150
221
267
301
1%
1%
1%
1%
1%
145-246-00
145-255-00
145-258-00
145-268-00
145-277-00
145-281-00
145-289-00
145-312-00
145-314-00
145-326-00
145-331-00
RES MF SM .1W 1% 357 OHM
RES MF SM .1W 1% 442 OHM
RES MF SM .1W 1% 475 OHM
RES MF SM .1W 1% 604 OHM
RES MF SM .1W 1% 750 OHM
RES MF SM .1W 1% 825 OHM
RES MF SM .1W 1% 1K00 OHM
RES MF SM .1W 1% 1K74 OHM
RES MF SM .1W 1% 1K82 OHM
RES MF SM .1W 1% 2K21 OHM
RES MF SM .1W 1% 2K49 OHM
357
442
475
604
750
825
1K00
1K74
1K82
2K21
2K49
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
145-335-00
145-339-00
145-341-00
145-346-00
145-350-00
145-354-00
145-356-00
RES MF SM .1W 1% 2K74 OHM
RES MF SM .1W 1% 3K01 OHM
RES MF SM .1W 1% 3K16 OHM
RES MF SM .1W 1% 3K57 OHM
RES MF SM .1W 1% 3K92 OHM
RES MF SM .1W 1% 4K32 OHM
RES MF SM .1W 1% 4K53 OHM
2K74
3K01
3K16
3K57
3K92
4K32
4K53
1%
1%
1%
1%
1%
1%
1%
A-4
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
1%
REFERENCE DESIGNATORS
P1
R189 R215
R177 R203
R266
R156 R238
R25 R45 R78
R256
R220 R222
R261 R263-264
R254-255
R183 R240 R249 R260
R248 R262
R152 R201
R62 R267
R202 R212
R265
R22
R157 R237
R1-2 R29 R115 R140 R162
R47-48 R55-56
R226 R246
R14
R35 R61 R63-64 R85
R107
R70
R71
R26 R57-60 R93
R75
R6 R145 R223-224 R231-232 R242-244
R247 R275
R28
R173 R193 R196 R221
R76 R191 R217
R138
R158 R176 R184 R200 R208 R214 R233
R235 R239 R241 R250 R257
R280
R174-175 R197-198
R72
R218 R229
R182 R210
R27
R20-21 R83
R126
R230 R234 R251 R258
R204 R209
R13 R73 R109 R141 R146 R154 R171-172
R190 R192 R194-195 R216 R219
R18
R137
R87
R84 R276
R116 R160
R123 R153
R38 R40 R43-44 R90-92 R94-97 R103
R105-106
227c
PART NO.
DESCRIPTION
VALUE
REFERENCE DESIGNATORS
145-358-00
145-361-00
RES MF SM .1W 1% 4K75 OHM
RES MF SM .1W 1% 5K11 OHM
4K75
5K11
1%
1%
145-369-00
145-371-00
145-373-00
145-375-00
145-377-00
145-381-00
145-384-00
145-389-00
RES MF SM .1W 1% 6K19 OHM
RES MF SM .1W 1% 6K49 OHM
RES MF SM .1W 1% 6K81 OHM
RES MF SM .1W 1% 7K32 OHM
RES MF SM .1W 1% 7K50 OHM
RES MF SM .1W 1% 8K25 OHM
RES MF SM .1W 1% 8K87 OHM
RES MF SM .1W 1% 10K0 OHM
6K19
6K49
6K81
7K32
7K50
8K25
8K87
10K0
1%
1%
1%
1%
1%
1%
1%
1%
145-390-00
145-394-00
145-395-00
145-406-00
145-409-00
145-412-00
145-418-00
RES MF SM .1W 1% 10K2 OHM
RES MF SM .1W 1% 11K3 OHM
RES MF SM .1W 1% 11K5 OHM
RES MF SM .1W 1% 15K0 OHM
RES MF SM .1W 1% 16K2 OHM
RES MF SM .1W 1% 17K4 OHM
RES MF SM .1W 1% 20K0 OHM
10K2
11K3
11K5
15K0
16K2
17K4
20K0
1%
1%
1%
1%
1%
1%
1%
145-422-00
145-435-00
145-437-00
145-439-00
145-441-00
145-442-00
145-454-00
145-471-00
145-473-00
145-477-00
145-479-00
145-485-00
145-498-00
145-514-00
145-518-00
145-522-00
145-550-00
145-553-00
145-560-00
145-565-00
150-009-00
150-037-00
150-045-00
RES MF SM .1W 1% 22K1 OHM
RES MF SM .1W 1% 30K1 OHM
RES MF SM .1W 1% 31K6 OHM
RES MF SM .1W 1% 33K2 OHM
RES MF SM .1W 1% 34K8 OHM
RES MF SM .1W 1% 35K7 OHM
RES MF SM .1W 1% 47K5 OHM
RES MF SM .1W 1% 71K5 OHM
RES MF SM .1W 1% 75K0 OHM
RES MF SM .1W 1% 82K5 OHM
RES MF SM .1W 1% 86K6 OHM
RES MF SM .1W 1% 100K OHM
RES MF SM .1W 1% 137K OHM
RES MF SM .1W 1% 200K OHM
RES MF SM .1W 1% 221K OHM
RES MF SM .1W 1% 243K OHM
RES MF SM .1W 1% 475K OHM
RES MF SM .1W 1% 511K OHM
RES MF SM .1W 1% 604K OHM
RES MF SM .1W 1% 681K OHM
RES FUS .25W 5% 2.2 OHM
RES FUS .25W 5% 33 OHM
RES FUS .25W 5% 68 OHM
22K1
30K1
31K6
33K2
34K8
35K7
47K5
71K5
75K0
82K5
86K6
100K
137K
200K
221K
243K
475K
511K
604K
681K
2.2
33
68
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
5%
5%
5%
R42 R99-100
R3-4 R9 R11 R30 R66-69 R79-81 R102 R120
R124 R127 R142
R15
R111-112 R159
R136
R89
R46 R98 R101 R169
R139
R37
R7-8 R19 R23-24 R31-33 R36 R88 R108
R117 R129 R132-133 R143 R161 R165
R268-273
R150-151 R274
R148
R134
R16 R34 R135
R119 R281
R279
R41 R121-122 R144 R167 R170 R225
R227-228 R245 R252-253 R259
R5 R12
R50 R53-54 R113-114 R125
R277
R74
R278
R49 R52
R10 R77
R39 R51
R118 R147 R163
R128 R166
R86
R110 R168
R104
R17
R65
R130
R155
R131
R149
R82
R164 R178 R180 R206 R211 R236
R179 R181 R186-188 R199 R207 R213
R185 R205
Components noted with this symbol shall be replaced only by the component specified. A-5
This is required to maintain product safety.
227c
PART NO.
DESCRIPTION
VALUE
REFERENCE DESIGNATORS
200-004-02
200-023-00
200-024-00
200-027-02
PLY .047UF 10% 100V TR
PLY/BX .001UF 20% 250V Y2
PLY/BX .01UF 20% 250V Y2
PLY .1UF 5% 100V TR
0.047
.001uF
.01uF
0.1
10%
20%
20%
5%
200-041-00
200-042-02
205-001-02
205-002-02
212-001-00
PLY/FL .01UF 10% 250V
PLY/BX .22UF 10%250V TR
MICA 180PF 5% 500V T/A
MICA 270PF 5% 500V TR
CER .01UF 10% 50V X7R SM
0.01
0.22
180pF
270pF
0.01
10%
10%
5%
5%
10%
212-003-00
212-004-00
212-006-00
212-010-00
212-020-00
212-021-00
212-023-00
212-035-00
212-041-00
220-001-02
220-002-02
CER 100PF 5% 50V NPO SM
CER 220PF 5% 50V NPO SM
CER 470PF 5% 50V NPO SM
CER .1 +80/-20 25V Z5U SM
CER 750PF 5% 50V NPO SM
CER 27PF 5% 50V NPO SM
CER .001UF 10% 50V NPO SM
CER 560PF 5% 50V NPO SM
CER 75PF 50V NPO 0805
LYT 22UF 20% 25V RAD TR
LYT 47UF 20% 25V RAD TR
100PF
220PF
470PF
.1UF
750PF
27pF
0.001
560PF
75pF
22UF
47UF
5%
5%
5%
-400
220-004-02
220-005-02
220-027-02
220-030-00
220-051-00
224-002-00
224-003-00
224-006-00
224-007-00
224-009-00
224-010-00
224-013-00
224-014-00
224-015-00
224-016-00
224-017-00
224-021-00
224-024-00
224-025-00
224-026-00
224-031-00
224-034-00
LYT 470UF 20% 6.3V RAD TR
LYT 470UF 20% 25V RAD TR
LYT 10UF 20% 50V RAD TR
LYT 1000UF 20% 6.3V RAD
LYT 6800UF 20% 50V RAD
PLY .0012UF 2% 50V SM
PLY .0018UF 2% 50V SM
PLY .0047UF 2% 50V SM
PLY .0068UF 2% 50V SM
PLY .01UF 2% 50V SM
PLY .1UF 2% 50V SM
PLY .015UF 2% 50V SM
PLY .033UF 2% 50V SM
PLY .047UF 2% 50V SM
PLY 470PF 2% 50V SM
PLY .0015UF 2% 50V SM
PLY .33UF 5% 16V SM
PLY 560PF 2% 50V SM
PLY .068UF 2% 50V SM
PLY .056UF 2% 50V SM
PLY .0056UF 2% 50V SM
PLY .47UF 5% 16V SM
470UF 10%
470UF 10%
10UF
10%
1000UF 10%
6,800UF 20%
0.0012 2.00%
0.0018 2.00%
0.0047 2.00%
0.0068 2.00%
0.01
2.00%
0.1
2.00%
0.015 2.00%
0.033 2.00%
0.047 2.00%
470pf 2.00%
0.0015 2.00%
0.33
5%
560PF 2.00%
0.068 2.00%
0.056 2.00%
0.0056 2.00%
0.47
5%
C130 C141
C168 C169
C172
C118 C123 C128 C133 C136 C144-145
C152 C163-164
C162 C167
C174-175 C177-178
C131 C143
C129 C140
C2 C10 C16-17 C19 C23 C28-29 C31-32
C34 C36 C38-39 C41 C45-46 C48-50
C54-55 C57 C59 C63-65 C67 C69-70 C72
C77-79 C85 C87 C92 C95 C98 C101-102
C108-111 C114 C124-125 C138 C142
C151
C8 C52-53 C56 C74 C81 C90
C6-7 C51 C100
C22 C27
C26 C61
C89 C121 C127 C134-135 C148 C154
C147
C3-5 C120 C150 C155 C160
C42-43 C82-83
C137
C96 C126
C13 C24-25 C30 C35 C47 C119 C146
C149 C153 C157-159
C1
C156 C165
C80 C88 C94 C122 C132 C139 C176
C161
C166 C170-171 C173
C18 C99 C115
C112
C33 C60 C66 C68 C71 C97
C91 C93 C180-181
C9 C11 C103-105 C179
C84 C116
C113
C73
C12 C14 C76 C86
C58 C106
C107
C62 C75
C15
C117
C21 C37 C44
C40
C20
A-6
10%
5%
10%
20%
Components noted with this symbol shall be replaced only by the component specified.
This is required to maintain product safety.
227c
PART NO.
DESCRIPTION
VALUE
REFERENCE DESIGNATORS
300-003-00
DIO SW DL4148 100V SM
DL4148
300-010-00
301-019-00
301-021-00
301-023-00
302-025-03
302-026-00
304-027-02
304-029-02
310-014-00
310-015-00
310-024-00
310-025-00
310-028-00
310-029-00
310-035-00
310-036-00
310-037-00
310-038-00
310-050-00
310-053-00
310-054-00
311-001-00
311-002-00
311-007-00
311-008-00
311-019-00
311-020-00
320-006-00
320-012-00
320-015-00
323-002-00
400-041-00
400-060-00
400-132-00
400-133-00
400-139-00
400-163-00
400-171-00
400-173-00
400-223-00
400-243-00
400-307-00
450-227-00
500-026-00
500-037-00
510-013-00
510-011-00
510-024-00
620-025-00
706-033-10
712-021-01
712-062-00
760-107-00
DIO SIG RLS245 220V 200MA
DIO PWR BRDG 25A 400V SIP
DIO PWR DL4004 SM
DIO PWR SR505
DIO ZEN DL5245B 15V SMT
DIO ZEN 1N4744A 15V 1W
LED RED W/.425 SPACER TR
LED GRN W/.425 SPACER TR
XSTR PNP MJE2955
XSTR NPN MJE3055
XSTR PNP 2SB817
XSTR NPN 2SD1047
XSTR PNP 2SB940A POWER
XSTR NPN 2SD1264A POWER
XSTR PNP 2SA1478
XSTR NPN 2SC3788
XSTR NPN MJE340 POWER
XSTR PNP MJE350
XSTR NPN 2SC1567A
XSTR MOSFET PCH IRFP9140N
XSTR MOSFET IRFP150N
XSTR NPN IMBT4401 SM
XSTR PNP MMST4403 SM
XSTR PNP 2SA1415
XSTR NPN 2SC3645
XSTR PNP 2SB792 SM
XSTR NPN 2SD814
OPAMP 2068E
OPAMP NJM4560M
IC, VCA
LM339D QUAD COMP SM
XLR VERT MALE PCMNT
FUSE CLIP PCMT
IEC MALE RTA PCMT
HDR 6CK 11A/600V
SHUNT 2P .100
HDR 4P .165X2 M V W/PEGS
HDR 2P .100X1 STR
TERM .25 QKDS PCMT STABLE
XLR PCMNT NEUTRIK-AP SER
HDR 2P .098X1 SHRD
HDR 6P .098X1 SHRD RTA
PCB, SRM450: AMPLIFIER
THERMOSTAT 67F070 PCMNT
SWITCH 2PDT PUSH V SNAPIN
FUSE SB 7A 5X20MM 250V
FUSE SB 4A 5X20 250V IEC
FUSE SB 8A 5X20MM 250V
CBL 3P .100 3.25IN
STDF SWAGE NO.4 X .527L F
RVT CL END .125X.062-.125
BRKT ANG 6-32 ONE HOLE
BTN 2 COLOR 9X5MM
RLS245
25A
DL4004
SR505
DL5245B
1N4744
RED
GRN
A
A
2SB817
2SD1047
2SB940A
2SD1264A
2SA1478
2SC3788
MJE340
MJE350
2SC1567A
IRFP9140N
IRFP150N
IMBT4401
IMBT4403
2SA1415
2SC3645
2SB792
2SD814
NJM 2068
NJM4560M
SSM2164SMD
LM339
D1-15 D19-21 D23-25 D27-31 D35 D37-41
D44 D47-48 D54
D26 D32 D34 D36
D55-56
D16 D22 D33 D42 D45 D52 D57
D50-51
D17-18 D43 D49
D46 D53
D59 D61
D58 D60
Q34 *
Q35 *
Q3 Q32
Q8 Q21
Q10 Q19 Q34 (Q34 may be a MJE2955) *
Q9 Q20 Q35 (Q35 may be a MJE3055) *
Q23
Q12
Q14-15
Q4-5
Q11 Q18
Q33
Q2
Q1 Q29 Q42
Q30-31 Q41 Q43
Q6 Q17 Q22 Q24
Q7 Q13 Q16 Q36
Q27-28 Q39-40
Q25-26 Q37-38
U3 U20
U1-2 U4 U6-8 U10-19 U21-26
U9
U5
J18
Z4-5
J1
J12
Z11
J16
J6-8 J15 J20-21
J2-5
J17
J13 Z100
J14
Z50
TH1
SW1-3
F1
For 120V units
F1
For 230V units
F1
For 100V units
J19
SO1-3
Z6
Z104
Z8-10
67F070
2P2T
A
1
B
1
A
1
Components noted with this symbol shall be replaced only by the component specified. A-7
This is required to maintain product safety.
SRM450 Bias Adjustment, sheet 1 of 2
Model:
SRM450 Active Speaker
Serial Number: ALL
Effective:
June 1999
Problem: The Amplifier Bias of every SRM450 must be carefully adjusted as follows.
Procedure:
1. Place the SRM450 on its side so that the heatsink fins are horizontal.
2. Connect the power cord and turn it on, with no input signal applied.
Make sure that the TIMED TURNOFF switch is OFF.
3. Let it sit this way for an hour or more to allow the
heatsink temperature to rise. You can play music
through to speed things up.
If you have a thermometer, the bias adjustment
procedure is best done when the heatsink temperature is 45 to 50 deg C.
4. Turn off the SRM450 and remove the power cord.
5. Remove the complete amplifier/heatsink assembly from the plastic
speaker case but leave all wires connected, including the speaker wires.
Support the amplifier so it can be safely turned on again.
6. Replace the power cord and turn on the amplifier and take care not to touch
any exposed live AC components.
7. No input signal is applied.
8. Low frequency amplifier bias adjustment:
While the heatsink is still warm, measure the DC voltage across the 2 pins of J21.
Adjust R202 until a reading of 4mV to 4.5mV is reached.
See sheet 2 for the location of J21 and R202.
Important: When finished adjusting, secure R202 with a small drop of paint, such
as nail varnish.
9. High frequency amplifier bias adjustment:
Measure the DC voltage across the 2 pins of J20. Adjust R212 until a reading of
4mV to 4.5mV is reached.
Important: Secure R212 with a small drop of paint.
10. This completes the adjustment procedure. Reassemble and perform a full test.
SRM450 Bias SSE June 1999
HIGH FREQUENCY
BIAS ADJUSTMENT POT
LOW FREQUENCY
BIAS TEST POINT
HIGH FREQUENCY
BIAS TEST POINT
LOW FREQUENCY
BIAS ADJUSTMENT POT
+15 VDC
-15 VDC
+80V
-80V
+45V
-45V
THE MACKIE FIXER • MACKIE DESIGNS SERVICE NEWS
SRM450 Bias Adjustment, sheet 2 of 2
SRM450 Bias SSE June 1999
Description
Initial Release
Rev
A
Date
SRM450 Pole Mount Insert
Rework Instructions
851-033-00 REV A
Prepared by: ______________________________Date: _____________
Chad Trani
Manufacturing Engineer
Approved by: ______________________________Date: _____________
Ray Vancour
Field Service Manager
Approved by: ______________________________Date: _____________
John Ray
Quality Assurance Manager
SRM450 Pole Mount Insert Rework Instructions
Note: These instructions are to be used along with Mackie kit P/N 020-006-00 to
repair SRM450s which already have the pole mount insert stripped out. The
pole mount bolt assembly (bolt, knurled brass insert and alignment bushing)
must still be with the unit as the parts will be recycled and also used during the
rework.
1) Remove stripped out pole mount bolt assembly. This can be done by hand – one
or two sharp jerks on the bolt should pull the assembly free.
Pole Mount Bolt Assembly
2) Unscrew the defective brass knurled insert from the bolt and remove the black
metal bolt bushing.
3) Screw the metric nut (M6x1.00) onto the insert installation tool until it stops.
4) Screw the new replacement threaded brass insert onto the end of the installation
tool until it stops against the nut.
Replacement Insert
(Mackie P/N 712-073-00)
5) Slide the black metal bushing down onto the insert tool so it is behind the nut
(shoulder on the bushing should be away from the nut) – this will be used to align
the new insert during installation.
Page 2 of 4
Installation Tool Assembly
Insert Installation
6) Place the tool (insert first) into the pole mount hole.
7) Using the small pipe, gently tap the bushing into place so it fits snug. The
bushing only needs to be partially installed (as a guide) since it will be removed
shortly. Remove the pipe.
Tapping bushing into place with pipe
8) Attach drill or similar device to insert tool and drive insert into position
clockwise. Insert will stop against shoulder when at correct installed depth.
NOTE: DO NOT drive the insert in fast! Doing so will damage the plastic
hole and decrease the effectiveness of the repair. Drive the insert in
relatively slowly while applying downward pressure. You will feel the new
threaded insert (self-tapping) catch, start cutting and then bottom out once
the shoulder contacts the bottom of the hole. Once you feel this, STOP! DO
NOT force the insert past this bottoming out point or you will strip out the
new threads.
Page 3 of 4
9) Reverse the drill and back the tool out. A quick, sharp twist once you start to
back the tool out will break the tool free from the insert. You do not need to
remove the tool slowly as with the installation. The metal bushing will easily pull
out along with the installation tool.
10) Using a small flathead screwdriver or similar tool, remove the plastic chips from
inside the pole mount hole on the bottom of the speaker. If compressed air is
available, blow out the inside of the new threaded insert to remove any plastic
chips that may be present.
Plastic burrs from insert installation
11) Take the installation tool out of the drill and remove the metric nut from the
threaded end of the tool.
12) To reinstall the black metal bushing, screw the installation tool back into the
insert a few threads and slide the bushing back down the tool – with the shoulder
of the insert up. Again, using the piece of pipe, permanently tap the insert into
place until it bottoms against the shoulder. Take care to reinstall the bushing
straight.
13) Remove the insert tool and pipe.
14) Reinstall the original pole mount bolt. There may be some additional friction in
the threads. This is due to plastic burrs protruding slightly through the slots in the
insert – this friction will decrease the more the pole mount bolt is used.
Page 4 of 4
SRM450/C300 stabilizing feet
1
2
3
©2000 Mackie Designs Inc. All rights reserved
The following are trademarks or registered trademarks of
Mackie Designs Inc.: “Mackie” and the “Running man” figure.
Part No. 820-158-01 Rev A 8/2000
SRM450/C300 stabilizing feet
1
2
3
©2000 Mackie Designs Inc. All rights reserved
The following are trademarks or registered trademarks of
Mackie Designs Inc.: “Mackie” and the “Running man” figure.
Part No. 820-158-01 Rev A 8/2000