JBL PSW-D112 User manual

JBL Consumer Products Inc.
250 Crossways Park Drive
Woodbury, N.Y. 11797
1-800-336-4JBL in the USA
A Harman International Company
Rev E 7/2001
PSW-D112/DPS-12
Powered Subwoofer
SERVICEMANUAL

SAFETY INFORMATION
Warning
Caution
Leakage/Resistance Check
List of Safety Components Requiring
Exact Replacements
(all parts POWER AMP PCB except TR2)
C6 (Rev0)4.7uf 100V 80/-20% Electrolytic redial NP
C6 (Rev1)4.7uf 100V 80/-20% Electrolytic redial NP
TR2 MPS A13 30V NPN(Darl)
R4a/b/c 0.1 0.5W 5% metal film
R9 3.3 5W 5% ceramic wirewound
R15 100k 0.5W 5% carbon film
DBR Bridge Rect 200V Use only factory replacement.
R1 10M 0.25W 5% carbon film
R16, 17 1.8k 5W 5% ceramic wirewound
R33 (Rev0) only) 332 0.5W 5% carbon film
R50 (Rev0) only) 332 0.5W 5% carbon film
R52, 57 2.7k 5W 5% ceramic wirewound
R61 3.9k 3W 5% carbon film
S64AMI Power output module. Use only factory
replacement
Faceplate Faceplate. Use only factory replacement
CMC1 Use only factory replacement
L1 Use only factory replacement
Fuse PCB Use only factory replacement
Main PCB Use only factory replacement
4700uF,50V electrolytic filter caps. Be sure
replacement part is at least the same
working voltage and capacitance rating.
Also the lead spacing is important.
Incorrect spacing may cause premature
failure due to internal cabinet pressure and
vibration.
2
Amplifier/Subwoofer PSW-D110/DPS-10
F1
PWRCORD
TRX1
C1, 2
Transformer. Use only factory replacement.
SPT-2 or better with polarized plug, UL
approved wire with the hot side to fused
side. Use with factory replacement panel
strain relief only.
Fuse SLO BLO 1.25A 250V UL approved
Any person performing service of this unit will be exposed
to hazardous voltages and the risk of electric shock. It is
assumed that any person who removes the amplifier from
this cabinet has been properly trained in protecting against
avoidable injury and shock. Therefore, any service
procedures are to be performed by qualified service
personal ONLY!
Before returning the unit to the customer, perform a
leakage or resistance test as follows:
Leakage Current. Note there is no power switch on this
unit. When the power plug is plugged in, the unit is live.
Connect the unit to its rated power source. Using an
ammeter, measure the current between the neutral side of
the AC supply and chassis ground of the unit under test. If
leakage current exceeds 0.5A, the unit is defective.
Reverse the polarity of the AC supply and repeat.
Resistance. Measure the resistance from either side of the
line cord to chassis ground. If it is less than 500k ohms, the
unit is defective.
WARNING! DO NOT return the unit to the customer if it
fails one of these tests until the problem is located and
corrected.
This unit does not have a power switch. Hazardous
voltages are present within the unit whenever it is
plugged in.
Before the amplifier is plugged in, be sure its rated voltage
corresponds to the voltage of the AC power source to be
used. Incorrect voltage could cause damage to the
amplifier when the AC power cord is plugged in. Do not
exceed rated voltage by more than 10%: operation below
90% of rated voltage will cause poor performance or may
shut the unit off.
00465-2
IMPORTANT SERVICE NOTES: When testing the PSW-D112/DPS-12 Series amplifier, a load must always be
connected to the output terminals, whether the woofer, or a 4 to 8 ohm resistive load.
All AC powered test instruments (meters, oscilloscopes, etc.) must have a floating ground, i.e., be
connected to an isolation transformer.
Critical Components
All components identified with the IEC symbol
in the parts list and the schematic diagram
designate components in which safety can be
of special significance when replacing a
component identified with . Use only the
replacement parts designated in the parts list or parts with
the same rating of resistance, wattage or voltage.

3
Amplifier/Subwoofer PSW-D112/DPS-12
TABLE OF CONTENTS
SAFETY INFORMATION .......................................................2
TABLE OF CONTENTS.........................................................3
GENERAL SPECIFICATIONS ...............................................3
DETAILED SPECIFICATIONS...............................................4
CONTROLS AND THEIR FUNCTION...................................6
OPERATION...........................................................................7
SPEAKER CONNECTIONS...................................................8
TROUBLESHOOTING .........................................................10
TEST SET UP AND PROCEDURE......................................11
TESTING PROCEDURE......................................................12
POWER AMP MODULE TESTING FLOW CHART............14
SERVICE BULLETIN JBL2001-02 - FEBRUARY 2001........16
SERVICE BULLETIN JBL9903 Rev 1 - FEBRUARY 2001..15
CABINET EXPLODED VIEWS ............................................17
AMPLIFIER EXPLODED VIEW ...........................................18
MECHANICAL PARTS LIST................................................19
PACKING EXPLODED VIEWS....................................20
Rev0 PCB (Component Side)......................................21
Rev0 PCB (Solder Side)..............................................22
PCB (Component Side) PREAMP Rev1,
PWRAMP Rev1............................................................23
PCB (Solder Side) PREAMP Rev1,
PWRAMP Rev1............................................................24
ELECTRICAL PARTS LIST (Rev0) .............................25
ELECTRICAL PARTS LIST Rev1 PCB.......................27
INTEGRATED CIRCUITS ............................................29
SCHEMATIC 1 of 3 (Rev0) .........................................30
SCHEMATIC 2 of 3 (Rev0) .........................................31
SCHEMATIC 3 of 3 (Rev0) .........................................32
PREAMP SCHEMATIC Rev1 ......................................33
POWERAMP SCHEMATIC Rev1.0.............................34
POWERAMP SCHEMATIC Rev1.1.............................35
GENERAL SPECIFICATIONS
Amplifier Power (RMS)........250watts
Driver 12" .............High-Polymer Laminate
Inputs ...............Line Level and Speaker Level
Outputs ..............Line Level and Speaker Level
Low-Pass Frequency ........Continuously variable from 60Hz – 180Hz
High-Pass Frequency ........Continuously variable from 60Hz – 180Hz
when using line-level inputs
150Hz when using speaker-level inputs
Frequency Response ........28Hz – low-pass crossover setting
PSW-D112 DPS-12
Dimensions (HxWxD).......17-1/2 x 17-1/2 x 19-1/8" 22-1/8 x 17-1/2 x 17-1/2"
(445 x 445 x 486mm) (562 x 445 x 445mm)
Weight ...............40lbs/18.2 kg 38 lbs/17.3kg
NOTE: CERTAIN DRAWINGS AND CONNECTIONS WERE DEPICTED INCORRECTLY IN SOME EARLY COPIES
OF THE PSW-D112 AND DPS-12 OWNER'S MANUALS .
THEY INCLUDE:
1. DRAWING OF RCA LINE LEVEL INPUT/OUTPUT JACKS ON PAGES 3, 4, & 5; ALL CHANNELS - RIGHT SIDE
SHOULD BE “LINE OUT”, LEFT SIDE SHOULD BE “LINE IN”.
2. CONNECTION ON PAGE 4 OF OWNER'S MANUAL - SINGLE CABLE DIRECT INPUT (FOR DOLBY DIGITAL OR
DTS SURROUND); SINGLE CABLE FROM YOUR RECEIVER/PROCESSOR SHOULD CONNECT TO:
Rev0 version - THE “CENTER CHANNEL LINE IN” JACK ON YOUR SUBWOOFER.
Rev1 version - EITHER LEFT OR RIGHT INPUT JACK ON YOUR SUBWOOFER.
THOSE DRAWINGS ARE CORRECT IN THIS DOCUMENT, SEE PAGES 8 & 9.

DETAILED SPECIFICATIONS
LINE VOLTAGE Yes/No Hi/Lo Line Nom. Unit Notes
US 120vac/60Hz Yes 108-132 120 Vrms Normal Operation
EU 230vac/50-60Hz Yes 207-264 230 Vrms Normal operation, MOMS required
Parameter Specification Unit Test Limits Conditions Notes
Amp Section
Type (Class AB, D, other) D n/a Class D Preferred...Sink required for Class
AB
Load Impedance (speaker) 8Ohms n/a Nominal Z-curve required
Rated Output Power 250 Watts 150 1 input driven Peak power
THD@ Rated Power 0.3 %122k filter 160w (Power Bandwidth 30-100Hz) @ 120
VAC
THD @ 1 Watt 0.5 %0.8 22k filter
DC Offset <20 mV-DC 10mV @ Speaker Outputs
Damping factor >90 DF >50
Input Sensitivity
Input Frequency 40 Hz Nominal Freq. 1 input driven
Line Input 265 mVrms ±2dB To Rated Power/ Vol @ Max 1 input driven: AP source Z = 600 ohms
Speaker/Hi Level Input 9.3 Vrms ±2dB To Rated Power/ Vol @ Max 1 input driven: AP source Z = 25 ohms
Signal to Noise
SNR-A-Weighted 100 dBA 90 Relative to rated output A-Weighting filter
SNR-unweighted 75 dBr 70 Relative to rated output 22k filter
SNR rel. 1W-unweighted
(22k) 65 dBr 55 relative to 1W Output 22k filter
Residual Noise Floor 2mVrms 2.5 Volume @max, using RMS reading DMM/VOM (or A/P) , BW <20KHz
Residual Noise Floor 1.5 mVrms(max
)2Volume @max, w/ A/P Swept Bandpass Measurement (Line freq.+ harmonics) , BW<20Khz
Input Impedance
Line Input 10K ohms n/a Nominal
Speaker/Hi Level Input 5K ohms n/a Nominal
Filters 0dBr = 1w @ 50Hz
Low Pass (fixed or variable) Variable
Low Pass filter (point or
range) 60-180 Hz ±2dB -3dB Point
Slope 24 dB/Octave n/a
Q1Damping n/a
Subsonic filter (HPF) 25 Hz ±2dB -3dB Point
Slope 12 dB/Octave n/a
Q1Damping n/a
AV Boost YES —
4
Amplifier/Subwoofer PSW-D112/DPS-12

Limiter (yes/no) yes
THD at Max. Output Power 10 %functional ck. Maximum Output Power Maximum THD as a result of limiting.
Features
Phase Switch (yes/no) YES —functional ck.
Volume pot Taper (lin/log) LOG —functional ck.
Input Configuration —
Line In (L,C,R,AC3,Mono) L,R,C —functional ck.. Enabled w/Line/Spkr Input
Select Switch
Line Outputs (L,C,R) L,R,C —functional ck.. Buffered Output / Pre-Volume control
Line-Out Adj. X-over 130-240 Hz functional ck.. Var-HPF (Pot CCW and CW
positions) Rear panel Variable xover
Spkr/Hi Level In
(L,C,R,mono) L,R,C —functional ck.. Enabled w/Line/Spkr Input Select Switch
Spkr Out: Hi Pass Filter 100 Hz functional ck.. 8 ohm Satellite: 6dB/oct
passive xover Driven from zero ohms source impedance
Signal-Present LED Yes n/a Bi-Color LED (green=signal/ red=no signal)
Signal-Present Input Freq. 100 Hz Nominal 200uF Series Cap on PCB
Signal-Present Level 2mV 100Hz into Line Input w/ 1
ch. driven
Signal-Present Bandwidth 1k Hz Signal-Present-LPF for noise
immunity
Signal-Present Turn-on time 0sec. Amp connected and AC on, then input signal applied
Auto Mute/ Turn-OFF Time 15 min. T before muting, after signal
is removed
Power on Delay time 0.1 sec. 5AC Power Applied
Transients/Pops
Signal-Present Transient 5mV-peak n/a @ Speaker Outputs
Turn-on Transient 500 mV-peak 2v-pp @ Speaker Outputs AC Line cycled from OFF to ON
Turn-off Transient 500 mV-peak 4v-pp @ Speaker Outputs AC Line cycled from ON to OFF
Efficiency
Stand-by Input Power 25 Watts 25 @ nom. line voltage
Power Cons.@rated power 245 Watts 245 @ nom. line voltage
Efficiency 102.04% %65 Relative to rated output
Protection
Short Circuit Protection yes functional ck.. Direct short at output
Line Fuse Rating 2Amps 2Type-T or Slo Blo
5
Amplifier/Subwoofer PSW-D112/DPS-12

1. Power LED - Will illuminate when the unit is turned on
with the main power switch. This light will be RED when
the unit is plugged in and not receiving a signal; when
the PSW-D112 receives a signal, the light will cycle to
GREEN. If no signal is received after 10 – 15 minutes
the light will cycle back to RED (standby) until a signal is
present again.
2. Main Power Switch - Main Power Switch to the
PSW-D112/DPS-12; turn ON to energize the subwoofer.
Under normal operation, Power Switch may be left ON to
utilize the Auto ON/OFF feature. For extended periods of
non-use, or vacations, it is recommended that the
subwoofer's Power Switch be turned OFF.
3. Level Control - The subwoofer Level Control,
(PSW-D112, located on the front panel, DPS-12, on the
rear panel) adjusts the volume of the subwoofer relative
to the rest of the system.
4. Video Contour - The subwoofer Video Contour
Control, (PSW-D112, located on the front panel)
optimizes the subwoofer's performance for movie
listening. When the video-contour switch is “on” the
subwoofer's performance is tailored to deliver the impact
and excitement of today's movies. The green LED will
illuminate when the video-contour switch is on.
5. Speaker In Jacks - Main Input connection to
subwoofer when line level, subwoofer, or pre-amp output
connectors are not available, or when a high pass filter
(set at 150Hz) to main loudspeakers is desired through
the Speaker Output Jacks.
6. Speak Out Jacks - Connected to main loudspeakers
when the Speaker Input Jacks are used.
7. Phase Switch - Changes the subwoofer's output to be
in phase or 180 degrees out of phase with the program
material.
8. Line Input - Main Input connection to subwoofer
(preferred).
9. Line Output - When using the Line-Level Input jacks,
these are connected to an external power amplifier or
receiver to power the main loudspeakers with a high pass
filter if desired.
10. Direct In - If you will be connecting the PSW-D112 to
a receiver/processor containing a Dolby Digital or DTS
surround technology, use this single RCA connection.
See the owner's manual for complete instructions.
11. Direct Out - (rev0 version only) This connection
allows you to connect more than one PSW-D112 or
DPS-12 together; connect this output jack to the Direct
Input jack on the second subwoofer.
12. High Pass Control - Controls the roll-off point of the
lowest frequency produced at the Line Level Output
Jacks.
13. Low Pass Control - Controls the roll-off point of the
highest frequency the subwoofer will produce.
6
Amplifier/Subwoofer PSW-D112/DPS-12
min
max
video contour
level
60
90 150
180
120
60
90 150
180
120
180o0o
Phase
Low
Pass
High
Pass
D
i
r
e
c
t
L
I
N
E
I
N
L
I
N
E
O
U
T
Direct Out
L
C
R
L
C
R
L
C
R
Power
OnOff
SPKR In
SPKR Out
Front Panel ( only)PSW-D112
Rev0 version PSW-D112/DPS-12
Rev1 version
of the is
shown in this illustration, which has Center channel
input and output connectors; is missing
these, along with the “Direct Out”RCA connector.
Rear Panel
3
1
4
6
2
7
8
12
13
11
5
10
9
PSW-D112/DPS-12 CONTROLS AND THEIR FUNCTION

OPERATION
Crossover Adjustments
High-Pass Control
If you hooked up your subwoofer as shown in Speaker
Connection 4 on page 9. you also have the capability of
adjusting the high-pass frequency. The High-Pass control
determines the frequency at which the main speaker will
start reproducing sounds. If your main speakers can
comfortably reproduce some low-frequency sounds, also
set this control to a lower frequency setting, between 50Hz –
100Hz. This will concentrate the subwoofer’s efforts to the
ultradeep bass sounds, while your main speakers continue
to reproduce the mid-bass information. If you are using
smaller bookshelf speakers that do not extend to the lower
bass frequencies, set the high-pass crossover control to a
higher setting, between 125Hz –180Hz. With this setting,
your main speakers will not have the burden of reproducing
any low-frequency sounds.
If you hooked up your subwoofer as shown in Speaker
Connection 1 on page 8, the high-pass frequency is fixed at
150Hz.
If you hooked up your subwoofer as shown in Speaker
Connection 2 or 3 on page 8 and 9, no high-pass control
adjustment can be made from the subwoofer. Unless you
receiver/amplifier incorporates a high-pass crossover, your
main speakers will continue to get a full-range signal.
Final adjustment and blending of the low-pass and
high-pass controls may evolve over several listening
sessions. A good starting point would be to set both the low-
and high-pass controls to the same frequency and adjust
from that point.
Low-Pass Control
The Low-Pass control determines the highest frequency at
which the subwoofer reproduces sounds. If your main
speakers can comfortably reproduce some low-frequency
sounds, set this control to a lower frequency setting,
between 50Hz –100Hz. This will concentrate the
subwoofer’s efforts on the ultradeep bass sounds required
by today’s films and music. If you are using smaller
bookshelf speakers that do not extend to the lower bass
frequencies, set the low-pass crossover control to a higher
setting, between 120Hz –180Hz.
Phase
Phase Control
The Phase Control determines whether the subwoofer
speaker’s piston-like action moves in and out with the main
speakers, 0°, or opposite the main speakers, 180°. There is
no correct or incorrect setting. Proper phase adjustment
depends on several variables such as room size, subwoofer
placement and listener position. Adjust the phase switch to
maximize bass output at the listening position.
Remember, every system, room and listener is different.
There are no right or wrong settings; any setting you choose
will result in excellent performance. Should you decide to
fine-tune your system for optimum performance, be patient
and trust your ears. It will be worth the effort involved to fully
“tweak”your system.
7
Amplifier/Subwoofer PSW-D112/DPS-12

SPEAKER CONNECTIONS
1) If your receiver/amplifier has no
subwoofer outputs or preamp outputs
for the left, center and right channels.
See Figure 1.
2) If your receiver/amplifier has
subwoofer outputs or preamp output
jacks for the left and right channels.
See Figure 2.
8
Amplifier/Subwoofer PSW-D112/DPS-12
NOTE: The rear plate for the PSW-D112 is shown, which has the level control on the front panel. The DPS-12 has this
level control on the rear panel (amplifier). In addition, the Rev0 version of the PSW-D112/DPS-12 is shown in these
illustrations, which has Center channel input and output connectors; Rev1 version is missing these, along with the
“Direct Out” RCA connector.
60
90 150
180
120
60
90 150
180
120
180o0o
Phase
Low
Pass
High
Pass
D
i
r
e
c
t
L
I
N
E
I
N
L
I
N
E
O
U
T
Direct Out
L
C
R
L
C
R
L
C
R
SPKR In
SPKR Out
LEFT
SPEAKER
RIGHT
SPEAKER
SPEAKER OUTPUT
LEFT RIGHT
RECEIVER/AMPLIFIER
Figure 1
60
90 150
180
120
60
90 150
180
120
180o0o
Phase
Low
Pass
High
Pass
D
i
r
e
c
t
L
I
N
E
I
N
L
I
N
E
O
U
T
Direct Out
L
C
R
L
C
R
L
C
R
SPKR In
SPKR Out
Figure 2
RIGHT
LOUDSPEAKER
LEFT
LOUDSPEAKER
MAIN SPEAKER OUTPUT
SUBWOOFER OUT
LEFT
LEFT
RIGHT
RIGHT
RECEIVER/AMPLIFIER

3a) If your receiver/amplifier has a single
(mono) subwoofer output or LFE output,
connect the output using a “Y”-connector
(not included) to both Left or Right line-level
inputs on the subwoofer. Plug the single
male end of the “Y”connector into the
receiver/amplifier, and connect the 2
interconnect cables to the Left and Right
line-level inputs on the subwoofer.
3b) If you will be connecting the
PSW-D112/DPS-12 to a receiver/processor
containing a Dolby Digital or D.T.S. surround
technology:
1. For the Rev0 version, connect the
subwoofer or LFE output from your
receiver/processor to the Center.
line-level input as shown in Figure 3b.
2. For the Rev1 version, (with no center
channel input jack), connect the
subwoofer or LFE output from your
receiver/processor to EITHER Left or
Right line-level input jack with a single
RCA cable.
3. Set the “Low-Pass”control to the full
clockwise 180Hz setting.
The connection labeled “Direct”(on Rev0
version of the subwoofer) is an output that
allows you to connect several subwoofers, if
your system contains more than one
subwoofer.
4) If your receiver/amplifier has preamp
output jacks and main input jacks for the left
and right channels or you have a separate
pre-amp/ processor and power amplifier.
See Figure 4.
This method of hookup can offer the highest
level of performance for your complete
loudspeaker system. The PSW-D112/
DPS-12 incorporates a variable high-pass
crossover in addition to a variable low-pass
crossover. When hooked up as shown
above, the subwoofer will limit the
low-frequency information that is returned to
your receiver/amplifier. Your receiver/
amplifier does not need to waste valuable
power reproducing the low frequencies. In
addition, since no low-frequency information
is being sent to your main loudspeakers, they
are able to reproduce mid and high
frequencies with greater clarity
9
Amplifier/Subwoofer PSW-D112/DPS-12
180o0o
Phase
D
i
r
e
c
t
L
I
N
E
I
N
L
I
N
E
O
U
T
Direct Out
L
C
R
L
C
R
L
SPKR In
SPKR Out
Figure 3a
SUBWOOFER
OUTput/LFE
RECEIVER/PREAMPLIFIER
Figure 3b
SUBWOOFER
OUTPUT
RECEIVER/PREAMPLIFIER
180o0o
Phase
D
i
r
e
c
t
L
I
N
E
I
N
L
I
N
E
O
U
T
Direct Out
L
C
R
L
C
R
L
SPKR In
SPKR Out
60
90 150
180
120
60
90 150
180
120
180o0o
Phase
Low
Pass
High
Pass
D
i
r
e
c
t
L
I
N
E
I
N
L
I
N
E
O
U
T
Direct Out
L
C
R
L
C
R
L
C
R
SPKR In
SPKR Out
Figure 4
RIGHT
LOUDSPEAKER
LEFT
LOUDSPEAKER
MAIN SPEAKER OUTPUT
LEFT
RIGHT
RIGHT
CENTER
LEFT
RECEIVER/AMPLIFIER
PRE
OUT
MAIN
IN

TROUBLESHOOTING
If you used the high-level (speaker) inputs and
there is no sound from any of the speakers, check
the following:
nReceiver/amplifier is on and a source is playing.
nPowered subwoofer is plugged in.
nCheck all wires and connections between
receiver/amplifier and speakers. Make sure all wires
are connected. Make sure none of the speaker
wires are frayed, cut or punctured.
nReview proper operation of your receiver/amplifier.
If there is low bass output, check the following:
nMake sure the connections to the left and right
“Speaker Inputs”have the correct polarity (+ and –).
nMake sure that the subwoofer is plugged into an
active electrical outlet.
nAdjust the crossover point.
nFlip the Phase Control Switch to the opposite
position.
nIf you are using a Dolby* Digital/DTSÒreceiver or
processor, make sure that the subwoofer
adjustments on the receiver/processor are set up
correctly.
nSlowly turn the level Control clockwise until you
begin to hear the desired amount of bass.
If you used the line-level inputs and there is no
sound from the subwoofer, check the following:
nReceiver/amplifier is on and a source is playing.
nPowered subwoofer is plugged in.
nCheck all wires and connections between receiver/
amplifier and subwoofer. Make sure all wires are
connected. Make sure none of the wires are frayed,
cut or punctured.
nReview proper operation of your receiver/amplifier.
nSlowly turn the level Control clockwise until you
begin to hear the desired amount of bass.
nMake sure that you have configured your
receiver/processor so that the subwoofer/LFE output
is on.
10
Amplifier/Subwoofer PSW-D112/DPS-12

NOTE:When testing the PSW-D112/DPS-12 amplifier, a load must always be connected to the
output terminals, whether the woofer, or a 4 to 8 ohm resistive load.

12
Amplifier/Subwoofer PSW-D112/DPS-12
PSW-D112/DPS-12 TESTING PROCEDURE (REV0 ONLY)
A. Power Amp Sect on
1. Resistance Check Resistance from O/P of the module to GND should be >1M (NO OAD)
Resistance from V+ of the module to V- of the module should read >5k
Resistance from V+ of the module to O/P of the module should read >1M
Resistance from V- of the module to O/P of the module should read >1M
2. Power Up ED RED
- With a 35mV signal to ow level input, ED should change to GREEN
3. D.C. Operation
-Voltage measurements (DVM)
Between +6V V+ O/P V- +15V S/D FR I/P GND -15V
And V- GND GND GND GND V- GND GND GND GND
Should
be
Reading
+6.2V +90.1V 0V -90.1V +15.5V +5.75V 0V 0V 0V -15.5V
4. Check Switching Frequency
-Use scope (EITHER USES AN ISO ATION TRANSFORMER OR ATTACHES THE
PROBE TIP TO SPK- and REFERENCE EAD TO SPK+)
-Reading 100kHz +/-10%,500mVpp
B. Pre Amp Sect on
1. ow evel Input Sensitivity
-Set up Turn level and ow-Pass Pot Fully CW
Generator set at 100mV@39Hz
Signal to ow level input
-Voltage measurements
OP AMP
U1(14) U1(7) U1(1) U2(8) U2(14) U2(1) U4(1) U4(7)
SPEAKER
OUTPUT
271mV 409mV 486mV 471mV 456mV 460mV 2.94V 2.67V 17.4V
2. High evel Input Sensitivity
-Set up Turn level and o Pass Pot Fully CW
Set Generator at 3.6V@39Hz
Signal to High level input
-Voltage measurements 17.4V at speaker output

13
Amplifier/Subwoofer PSW-D112/DPS-12
3. ow-Pass
-Set up Set Generator at 100mV@100Hz
Signal to ow level input
Measure voltage at speaker output
-Voltage measurement
ow-Pass Pot Setting Output
CW 12.2V
CCW 1.2V
4. High-Pass
-Set up Set Generator at 100mV@100Hz
Signal to ow level input
Measure voltage at high-pass output
-Voltage measurement
High-Pass Pot Setting Output
CW 24mV
CCW 55mV
5. Direct out
-Set up Set Generator at 100mV@100Hz
Signal to ow level input
-Voltage measurement 100mV at direct out
See flow chart next page for diagnostics.

14
Amplifier/Subwoofer PSW-D112/DPS-12
PSW-D112/DPS-12 POWER AMP MODULE TESTING FLOW CHART (REV0 ONLY)

JBL Incorporated 250 Crossways Park Dr. Woodbury, New York 11797 [phone]
Service Bulletin
Service Bulletin JBL9903 Rev1 -February 2001 This is considered aMinor repair
To: All JBL Service Centers
Models: PSW-D110, PSW-D112,ARC SUB 8, ARC SUB 10
Subject: Check Solder Joints in Event of Failure
Some performance related complaints in the PSW-D110, PSW-D112, ARC SUB 8or ARC SUB 10 powered
Subwoofers may be caused by cold solder connections between the 28 pins of the Power Amp Module and the
main circuit board. When troubleshooting, failure to check these joints can result in erroneous conclusions or
wasted time.
In the event you receive aPSW-D110, PSW-D112, ARC SUB 8or ARC SUB 10 Subwoofer with the
complaints “Dead, or No Output, or Motorboating (Oscillation)”, perform the steps listed below first before
any further troubleshooting takes place:
1) Unplug all cables, lay the subwoofer on apadded surface.
2) Remove all Philips screws around the outer perimeter of the amplifier faceplate.
3) Remove amplifier assembly; you should be able to remove the amplifier far enough out of the cabinet to service it
without removing the woofer wires.
4) Locate the Power Amp Module; it is the large gray component with ametal case. On the solder side of the circuit
board are the 28 soldered connections to the Module.
5) Regardless of whether you can visibly see breaks in any of the connections or not,carefully re-solder all 28 pin
connections, adding 60/40 rosin core solder. Take care not “bridge” any connections on the board with solder.
6) Inspect the solder joints to the main filter capacitors C1 and C2 on the main PCB and re-solder if needed.
7) Replace the amplifier assembly back into the cabinet; replace the screws.
8) Test the unit by applying asignal from a music source, adjust the volume to amoderate level and confirm the
original problem has been corrected.
IMPORTANT SERVICE NOTES:When testing the PSW-D, or ARC Series amplifier, aload must always be
connected to the output terminals, whether the woofer, or a 4 to 8ohm resistive load.
All AC powered test instruments (meters, oscilloscopes, etc.) must have afloating ground, i.e. be connected to
an isolation transformer.
15

JBL Incorporated 250 Crossways Park Dr. Woodbury, New York 11797 [phone]
Service Bulletin
Service Bulletin JBL2001-02 -February 2001 This is considered aMinor repair
To: All JBL Service Centers
Models: PSW-D112 rev0*, DPS-12, PSW-D115
Subject: Check Ribbon Cable Connection In Event Of Failure
Some performance related complaints in the PSW-D or DPS Series powered Subwoofers may be caused by
broken or cold solder connections in the ribbon cable connector between the premamp and main PCB.
When this condition occurs, it may also damage the Input Op-Amps U1/U2.
When troubleshooting, failure to check this connector and Input Op-Amps U1/U2 can result in erroneous
conclusions or wasted time.
In the event you receive aPSW-D112*, DPS-12, or PSW-D115 Subwoofer with any of the complaints
“Dead, or No Output, or Motorboating (Oscillation)”, perform the steps listed below before any further
troubleshooting takes place:
1) Unplug all cables, lay the subwoofer on apadded surface.
2) Remove all Philips screws around the outer perimeter of the amplifier faceplate.
3) Remove amplifier assembly; you should be able to remove the amplifier far enough out of the cabinet to service it
without removing other connecting wires.
4) Locate the ribbon cable connector between the premamp PCB and the main PCB. See illustration.
5) Desolder the connection on that cable where the cable attaches to the premamp PCB; to access, you may have to
carefully remove or scrape adhesive from this area.
6) Cut approximately ½” of ribbon from the cable end, then strip enough of the insulator on each of the six conductors
to allow re-connection. Take care not to damage the wire. Solder the cable end back onto the premamp PCB.
7) Test the unit by applying asignal from a music source, adjust the volume to amoderate level and confirm the
original problem has been corrected.
8) If not, troubleshoot Op-Amps U1 and U2 by standard methods; replace if defective:
Make sure plus/minus voltages are present on pins 4and 11.
Make sure DC voltages are not present at output pins 1,7,8,14. (See schematic)
Apply asignal and confirm there is an output on pins 1,7,8,14. (See schematic)
9) Replace the amplifier assembly back into the cabinet; replace the screws.
*Rev 0of the PSW-D112 subwoofer is easily identified by the presence of Center channel Input and Output connectors
IMPORTANT SERVICE NOTES:When testing the
PSW-D or DPS Series amplifier, aload must
always be connected to the output terminals,
w
hether the woofer, or a 4 to 8ohm resistive load.
All AC powered test instruments (meters,
oscilloscopes, etc.) must have afloating ground,
i.e. be connected to an isolation transformer.
16

17
Amplifier/Subwoofer PSW-D112/DPS-12
CABINET EXPLODED VIEWS
SCREWS (12)
SCREWS (8)
JBL Logo
#200512
FEET
#200582
CABINET
NOT FOR
SALE
12" WOOFER
#200700
AMPLIFIER
ASSEMBLY
SCREWS (12)
SCREWS (8)
FOOT PART 1
#200670
FOOT PART 2
#200870
CABINET
NOT FOR
SALE
12" WOOFER
#200700
AMPLIFIER
ASSEMBLY
DPS-12
CABINET ASSEMBLY
PSW-D112
CABINET ASSEMBLY
GRILLE
#200710
CONTROL
PANEL
#200760
VOLUME KNOB
#70313
VIDEO CONT.
BUTTON
#70314
VIDEO CONT.
SWITCH
#70152

18
Amplifier/Subwoofer PSW-D112/DPS-12
AMPLIFIER EXPLODED VIEW
55
44
33
22
11
A
A
B
B
C
C
D
D
E
E
F
F
G
G
PSW-D112/DPS-12
Rev0
(PSW-D112 shown here)
Amplifier Assembly
Exploded View
shown here
13
14
12
17
15
11
6
19
7
2
5
16
4
8
10
S64AMI

19
Amplifier/Subwoofer PSW-D112/DPS-12
PSW-D112/DPS-12 MECHANICAL PARTS LIST
Ref. # Part Number Description Qty
PSW-D112/DPS-12
1 70302 Knob, 3 pcs on DPS-12, 2 pcs on PSW-D112
2 70312 Faceplate PSW-D112
2 70311 Faceplate DPS-12
3 70316 Amp PCB support
4 70150 Phase switch 1
(also DPS-12 Video Contour switch)
5 70151 Power switch Safety part
6 70170 #4x0.5" Screws to secure input jack
7 70171 #10 x 1" Screw machine screw
Bolts for transformer 4 per unit
8 70172 #10 keps Nuts for transformer 4 per unit 4
9 70173 #6 x 0.5" Screws for fuse PCB 2per unit 2
10 80116 Transformer #4632 Safety part 1
11 80117 250V, 2.0A, T type SLO BLO fuse Safety part
12 80118 Preamp board, D112,D115,DPS12 Safety part
13 80119 Power amp board D112, D115,DPS12
Safety part
14 80120 High level input PCB D112,D115,DPS12
Safety part
15 108116 High level 5way binding post(pr) (4) or (6)
16 108322 Six line RCA input jack (Rev0) 1
108321 Quad RCA input jack (Rev1) 1
17 108323 Single RCA input jack (Rev0 version only) 1

20
Amplifier/Subwoofer PSW-D112/DPS-12
PACKING EXPLODED VIEWS
DPS-12
PSW-D112
WARRANTY CARD
OWNER'S MANUAL
#200730 (120V)
#331993-001
WARRANTY CARD
#331993-001
OWNER'S MANUAL
#200830 (120V)
TOP FOAM PAD
#200722
TOP STYROFOAM
RAILS (2)
PER BOX
#200821
PSW-D112
DPS-12
BOTTOM
FOAM PAD
#200721
BOTTOM
STYROFOAM
RAILS (2)
PER BOX
#200822
CARTON
#200720
CARTON
#200820
BOTTOM
STYROFOAM
PAD
#200824
PLASTIC BAG
PLASTIC BAG
DPS-12
PSW-D112