DBX 162 Manual

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DBX 162 Manual | Manualzz
TE Vr FE
Preliminary Technical Service Manual
dbx Professional Products
May 1, 199]
dbx:
User/ Operator Description
Test Procedures
INITIAL FACTORY TEST & ALIGNMENT PROCEDURE
DRX MODELS 160 AND 161
WITHOUT R47 4 R39 (LATE 160 & 161)
TEST EQUIPMENT REQUIRED:
TYPE OR EQUIVALENT
QUANTITY ITEM
1 Signal Oscillator Kron-Eite 4200, Heath 1272
1 Digital Multimeter Dana 3300, B € K 282, Digitec 2110
1 Oscilloscope Any (covering 2udio band)
1 _ Wide Range db meter DBZ SK-C-1026, HP 427
1 Barmonic distortion meter DEX SK-B-1070, Heath 1M58, HP330,
GR1500, GR1900
1 + 5 db meter (calref. 1 volt) DBX SKC-1071
(optional) -
1 | Resistor Substitution Box Any. ¥ W 5% veluves, typically 10K
to 470K
NOTE: On model 160, tie " - " terminals to Gnd, for normel testing.
osc. | <
| £
NY OUT
MoD 166 = _ а . DSTD CTI
or 161 SCOPE METERS) METER
UNDEK
TEST
Геу{ сей 4-20-77
250025-03
1)
2)
2A)
3)
4)
5)
160/161 INITIAL PROCEDURE
Before applying power to unit, check mechanical zero of meter.
Supply Trim: Put resistance substitution box across Rl4 and measure DC
voltage at (+) side of C7. Turn sub box until voltage is +15 volts
+ 50 MV (+14.950 to + 15.050). Solder appropriate resistor in
Place. Check (-) side of CB to verify that it is -15 volts + 200 MV
(-14.800 to -15.200)
RMS Trim: (205) Connect sub box across the two RMS trim pins, and measure
the offset at the input pin of the RMS module. Trim the sub box until
voltage is zero + 15 MV, and solder appropriate resistor in place.
(209) With input of 1.228 VRMS at 100 Hz, place sub box between + v and
the trim pin on the RMS module. Drop input level to - 60 db and adjust
sub box until a symmetrical waveform is observed on comp pin, insert’
value chosen in R36 spot (typ 8K to 75KR)
VCA & RMS Symmetry:
Set oscillator to 1.228 VRMS
a) 100 Hz (Tune for peak on distortion meter) Set front panel
compression knob to "3" and output gain to +20. Turn threshold
control counter clockwise from "3v" until external db meter reads
"0" db. Turn trim pots R27 and R34 until distortion reads minimum.
Level Calibration:
Set oscillator to 1.228 VRMS
a) 100Hz turn R63 until the voltage at the end of R79 (closest to
the center of unit) is -.Oll VDC
Threshold Calibration:
Turn front panel "Threshold Control" until both led's are off.
knob and position so that pointer indicates just past "lV" and retighten.
(When both leds are off the input signal is at threshold level.) (See
fig. 1.) Step the oscillator up and down in 10 db steps verifying that
the threshold level matches the input signal at successive calibration
marks on the threshold dial.
Loosen
o! 3
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FIGURE Y
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dBx Model
163 TEST PROCEDURES
Before and After Burn-In
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DBX 3erTYorTb
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meter +hat can
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a
In addition to equipment shown on first page, use a known good 163 as a visual
reference for repair purposes.
Test Phase Prior to Burn-In
Switchable load can be built on banana plug such as Pamona MDP.
Preparation
a) Connect equipment as shown in Figure 1.
b) Adjust oscillator for 1 kHz and 1.26 VRMS (+2 dBv) using a voltmeter.
c) Determine frequency response errors of dB meters at 20 Hz, 200 Hz and 20kHz
1)
2)
a)
b)
3)
a)
b)
с)
а)
е)
Е)
9)
h)
i)
3)
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4)
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b)
с)
а)
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9)
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i)
5)
a)
b)
с)
using 2 kHz as reference. If the meters read low at a particular frequency
expect them to read low by the same amount when fed through a flatly responding
163.
163 Preparation
Set R25 (RMS Sym), R61 (VCA Sym), and R68 (Log)- to midrange.
Supply Voltage
Adjust R6 (Supply Voltage) for +12 +/- .1 VIC at point indicated in Figure 2,
Camon lead of voltmeter can be connected to point shown in Figure 3.
Measure for -12 +/- .4 VDC at point shown in Figure 2.
Distortion
Set oscillator to 100 Hz and +2 dBv.
Set rear panel switch to +4.
Switch cut 600 ohm load.
Set sliding pot to right (less). See Figure 2.
Adjust R33 (Threshold) so that the -6 dB lamp just lights.
Set R44 (Level) for +2 dBv out.
Set sliding pot to left. | | |
Alternate between R61 (VCA Sym) and R25 (RMS Sym) as you adjust for minimum
distortion. Two passes 1s usually encugh.
Reduce oscillator output by about 20 dB.
Adjust R68 (Log) for minimum distortion.
Set oscillator to +2 dBv.
Adjust R61 (VCA Sym) far distortion less than .056%.
DC Tracking
Set oscillator to 2 kHz and +2 dBv.
Switch in 600 ohm load.
Set sliding pot to right.
Adjust R33 (Threshold) so that -6 dB light just cames an.
Adjust R44 (Level) for +2 dBv out.
Set sliding pot to left. Observe that leds all light.
Suddenly reduce oscillator output to below -50 dBv. Observe that leds extinguish
at a uniform rate.
Set oscillator to +2 dBv. |
Reduce oscillator output by 40 dB. The -4 dB lamp must be on and the -8 de lamp must
be off.
Rear Panel Switch
Set oscillator to +2 dBv.
Set sliding pot samewhere in mid-range. Observe output level.
Check that output does not change by more than 1 dB when the sliding pot is
moved to either extreme fram the center position.
2,5 2 [09
Rev A
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Q Q É Ё © |dEx Model 163 Pre Burn-In Test
e ©
3 2 a В = H. Gardiner
99| ID
о o | & Underlined entries represent changes fram previous
step.
i set-up prep - - - - - Attach special load; adjust oscillator for
1.26 VRMS (+2 dBv) at 1 kHz. Check meter accuracy. --
163 Prep. . - - - - - Set R68, R61 and R25 midrange,
Supply Voltage - - - - - Adjust R6 for +12 +/- .1 VDC, check for
-12 +/- ‚4 VDC.
Distortion 100 |+2 [IR |+4_ [Out Adjust R33 so -6 dB lamp just lights, adjust R44
for +2 dBv out. |
100 | +2 | 1, |+4 [Cut Adjust R61 and R25 for minimum distortion,
100 №20 | L |+4 [out Adj R68 for minimum distortion.
100 ¡ +2 | L [+4 [Cut Adj R61 for minimum distortion less than ,056%.
DC Tracking 2kHz| +2 | R ¡+4 In Adj R33 so -6 lam just lights, R44 for +2 dBv out.
2kHz| +2 | L |¡+4 [In All lamps evenly lit.
2kHz [Off | L |+4 |Tn Lamps extinguish at even rate,
2kHz |+2 L [+4 [In - |
12kHz 1440 | L 1+4 |In | -4 lamp оп, -8 1апр off.
2kHz | +2 ¡L--R|+4 |In Output within 1 dB fram that at slider pots center
position,
Rear Switch 2xkHz | +2 | L |-10 In Output -11 +/- 3 dBv.
2kHz | +2 | L |Adj.|In Rotate R38 rear panel cw; Output +6 +/- 3 dBv.
2kHz | +2 | L' |Adj.|In Rotate R38 rear panel ccw; output -19 +/- 3 dBv.
Freg. Resp. 2kHz| +2 | R |+4 [In Output is reference level,
20k | +2 | R [+4 [In Reference level +/- 1 dB.
20Hz| +2 | ® |+4 [Out о"
200 ; +2 { R (+4 |In "
Noise 200 | +2 | R [+4 |Tn Short input after disconnecting fram oscillator.
Output less than -82 dBv. Reconnect to oscillator.
Wa x pots .
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INITIAL FACTORY TEST AND ALIGNMENT PROCEDURES
DBX MODEL 162
TEST EQUIPMENT REQUIRED:
Quantity TE . e TEL A ED
1 Signal Oscillator Xron-Hite 4200
l Digital Multimeter Dana 3300 .
1 Oscilloscope Any (covering audio range)
1 Wide Range dB Meter DBX SK-C-1026, HP427
1 Harmonic Distortion Meter DBX SK-B-1070, Heath IM58 or IM5258
HP330, GR1500, 1500
1 + 3 dB Meter (Cal. Ref. 1 Volt) DBX SK-C-1071
1 Test Unit DBX Model 162
1 Test Adaptor (optional) DBX TA-162
l Tone Burst Generator GR1396 В, 73X --26É72L7
3 Phono-to-Phono Shieided Cables
2 Input/Output Phono Shielded Cables
162 TEST SET-UP
our
TEST
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ide EXPANDED DisT
ANGE RAN GE METER.
DB DB
„ТВ ТЕХ. METER
a
E .
e
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1 Y Fower Supnlv Adiust:
+ ,*) Measure the voltage at pin 7 of the FC 7 connector, anú
adjust 121 for +*5 volts + ,0! volts, “easure the
ze at pin $ of the same connector. [Must measure
between - 14,85 to - 15.15 vcits.
21 Jual AMS Calibration:
+
In the followi procedure, anvthing written in double
parenthesis (C5) concerns channel 2.
2.1) Apply *.0 VA“S 2 1 hz to both crannels, measure the voltage
on the minus side of С29 {minus side of £2%4)). Adjust R20
€3:0)) for * 0 " volts + ,00! volts . ( with switch set for
input mode)
2.2) “nnitor the half wave rectified siznal at the junction of
23 and 215 Ciunction of #3 and 249) of the dual 3IMS module.
Step the oscillator бо -%0 ib ani adjust 223021) if
necessary, for a half wave.
2,3) Short the oscillator znd adjust 224 ((7221) for a DC voltage
of +,4530 volts. ( 2e-aijust 22320072: if required).
2.4) Yeasure "zin 3 " on both JCA
T
e
15. reading must de within т
f not, aijust 2!
(ne
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us
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2.5) “epeat sters 2,1 thru 2, til the Dual RMS tracks zs
follows:
-10 db -.0%0 vic (+ ‚001 )
0 db -.700 vi (‚029 )
-10 4b +,040 vie ((+.001 )
-20 4 +,120 vie (+.002 )
-30 4b +,150 vdc (+.003 )
-40 db +.240 vic (+,004 >)
-50 db +,300 vde —(+,012 >)
-~0 ib + ‚350 vide (+ 024 )
Shorted +,430 vice (+.425 to +.480)
6,3) Turn power off and adjust the mechanical zeroes of
M1 and M2. Turn power back on.
Cow 7ro! LOCATION D'AGRAM
Oo са
2123 Ri2S.
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R 127 | Al ¡EL © 72%
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6.4) Mode switch " input ". Apply 1 VaMS @ 1 khz to " both"
5.5)
7.2)
channels. Adjust R124 A R1228 for odb on M1 € M2 À.
Step oscillator from - 30 db to + 10 db. Adjust R115
8 2107 so that M1 € M2 track properly from - 30 to
+ 10 35.
Set mode switch (F.P.) to " output". Set compression
control to "6" , Apply 1 VEIMS 8 1 khz to " both "
channels. Step oscillator to - 30 db and adjust threshold
control until both LEDS go out,
Step oscillator to + 10 db and adjust front panel gain
control for a convenient reading on M1 & M2 N. Step
oscillator to - 30db and adjust El32 € R133 № Гог
minimum change оп М1 € M2 №, from previously, set reading.
8) Gain Change M1:
8.1)
8.2)
Apply 1 VAaMS 8 1 khz to " bothfchannels. Set compression
control to " 1 ". Place mode switch to * gain change"
ad just R124 to obtain a "O" db reading on Mi.
Place mode switch to " input". Adjust R125 (R.P.) for
"0" db on M1.
11) Output Cain Check:
11.1)
11.2)
11.3)
Apply 1.00 VEMS at 1 khz to "both" channels. Place
mode switch to " output", Set compression control
to "1" Set front panel gain control to "0", №1
and M2 should both read "О" а5 well as the external
meters.
Set front panel gain control fully clockwise. M1 and
M2 must read +20db, Check external meter both channels
(+ 14b)
Set front panel sain control fully counter-clockwise.
¥1 and M2 must read -20 db. Check external meter both
channels (+ 1db)
12) Compression Check:
12.1)
12.2)
12.3)
12.4)
Apply 1.00 VAMS at 1khz to * both " channels. Set mode
switeh to " output? Set compression control to" 09".
Monitor channel 1 on the external mete». “Step oscillator
to -30 db and adjust the threshold control so that both
LEEDS are off, Note reading on the meters, Step oscill-
ator to +10 db. Neither M1 or M2 or the external meter
should change, more than + 1db.
Zepeat step(12.1) while monitoring channel 2 on the
external meters.
Set compression to "4", ‘hile still monitoring channel
2 on the external meters, step oscillator to -30 db and
ad just the front panel gain control for a convenient
reading on the external meter. E.G. -30 db. Step
oscillator to +10 db. XZeading should change 1095 adjust
=28, if necessary.
After R88 is properly adjusted, step oscillator from
-30 db to +10 db in 10 ib steps. External meter should
vary in 2.5 db steps.
12.5) Set threshold fully CW, apply 1.0 VRMS at 1KHz to both channels, Vary
13) Distortion Ad inst
ssion LATA Should be no change noted on external meters,
13.1) Apply 1.00 VRMS at 100hz to "both" channels. Place mode
switch to " output ". Flace compression control to "oO".
Set front panel gain control fully clockwise. Monitor
channel 1 and adjust the threshold control for a reading
of "O" on the external meter. Adjust the pot on the
channel 1 VCA for minimum distortion. Must be less than
1%.
13.2) Repeat step (13.1) while moxnfturing channeF-7 di adjust
the pot on the channel 2 VCA.
rage $
18) Ground Compensation:
18.1) Apply 1.00 VRMS at lkhz t o "both" channels. Set U.U.T.
for unity gain on the external meters. Place ground comp.
switch to " GROUND CCMP.". The external meter must read
less than -40db, Perform this step for "both" channels,
Return ground comp. switch to its normal position.
({( Low side of DZM'S must be ungrounded for this test)).
19) Output Level:
19.1) Apply +10dbv at lkhz to "both" charnels, Set compression
control to "1", Monitor the output to the scope with an
AC DVM,
19.2) Place the 500/10K switch to 10K. Adjust the front panel
gain control until clipping is observed, Must occur at
over 15.46 RMS,
19.3) Place the switch to 600. Adjust front panel gain control
until clipping is observed. Must occur at over 12.28 VRMS.
19.4) Perform steps ( 19.1 ) thru ( 19.4 ) om both channel 1
and channel 2,
19.5) Place $00/10K switch to the 10K position.
20) Juad Couvler Test:
20.1) Master Position
1) Connect the connector from the Quad Coupler Test Box
to the Jones connector on the rear of U.U.T. Note that
both "PLUS" and "MINUS" LED'S are lit. Monitor the out-
put of the test box with a D.V.M. apply 1.00 VRMS
at lkhz to"BOTH" channels. Set "THRESHOLD" fully
CCA, Set "COMPRESSION" to "1", Place mode switch to
"CUTPUT", Place "MASTER/SLAVE" switch to "MASTER",
2) Place test box to position #1. D.V.M. should read
-.018+ .002 VDC,
3) Place test box to position #2. D.V.M. should read
O+ .1VOC.
Place test box to position #3. Vary the front panel
gain control to fully CW D.V.M. should vary from 7+1VX to
-1VDC,
5) Place test box to position #4. D.V.M. should read
O + .,1VDC,
6) Place test box in position #5 2,V.M. should read
O+.002 VDC, Zotate "COMPRESSION" fully CW, D.V.M.
should ready -.2 VDC.
7) Flace test box in position #6. D.V.M. should read
0+ 1 VDC.
4)
23) Seal Potentiometers:
23.1) Seal all pots except R125 and R123,
23.2) Install tie wraps to secure all modules.
24) Burn-In:
24.1) Place burn-in racks with appropriate input power applied.
( 120 or 240 volts.)
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Key Features

  • Dual-channel VCA design for accurate and musical compression
  • RMS level detection for precise level control
  • Sidechain filter for frequency-dependent compression
  • Variable attack and release times for customized dynamics processing
  • Auto mode for automatic gain control
  • Stereo link mode for linked operation

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Frequently Answers and Questions

What is the difference between dbx 162 and other compressors?
dbx 162 is a dual-channel VCA compressor with RMS level detection, which sets it apart from other compressors. This combination provides accurate and musical compression, making it ideal for a wide range of audio applications.
What is RMS level detection?
RMS level detection measures the average power of an audio signal over time, providing a more accurate representation of the signal level than peak detection. This results in more consistent and natural-sounding compression.
How do I use the sidechain filter?
The sidechain filter allows you to apply compression to specific frequency ranges of the audio signal. This can be useful for controlling resonances, reducing sibilance, or creating other frequency-dependent effects.
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