JBL DS 10 (serv.man2) Service Manual ▷ View online
1 3
Amplifier/Subwoofer
ARC SUB10/DS-10
ARC SUB10 / DS-10 POWER AMP MODULE TESTING FLOW CHART
No
Yes
No
Yes
No
Yes
No
Yes
No
No Yes
Yes
H
No
No
Yes
No
No
Yes
START
Check V+,
V-, +/-15V
voltage to
module
Check fuse
transformer,
CMC,
rectifier, C1,
C2
Check
switching
frequency
100KHz
+/-10%
~1Vpp
Check I/P of
module to
GND 0V D.C.
Power up with
no signal I/P
LED RED
OK
OK
OK
OK
OK
OK
OK
OK
Check C12
and Pre-AMP
Check O/P to
module for
80Vpp square
wave
measure to
GND
Check L1,
L2, C6, C24
Check 6V to
module
measure to V-
Replace
Module
Power AMP
OK
END
Check D1,
R1, Q3, Q4,
Q5 and SCP
Check
transformer,
CMC,
rectifier, C1,
C2, D9, D10,
R16, R17
Check S/D
voltage to
module (5V)
measure to V-
voltage to
module (5V)
measure to V-
Check D6,
R9, R46
Resistance
check
between V+
V- and O/P
O/P to GND
should > 5K
check
between V+
V- and O/P
O/P to GND
should > 5K
SERVICE BULLETIN JBL9903 - APRIL 1999
To all JBL Service Centers
This considered a Minor repair
Model: ARC SUB10 / DS-10
Subject: Check Solder Joints in Event of Failure
Some performance related complaints in the ARC SUB10 / DS-10 powered subwoofer 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 a ARC SUB10 / DS-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 a padded 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 a metal case. On the Solder side of the
circuit board are the 28 Solder 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 a signal from a music source, adjust the volume to a moderate level and confirm the
original problem has been corrected.
1 4
Amplifier/Subwoofer
ARC SUB10/DS-10
SERVICE BULLETIN JBL2000-01 - JANUARY 2000
To all JBL Service Centers
Warranty labor rate: MINOR repair
Model: ARC SUB10 / DS-10
Subject: Failure of C6
In the event you receive a JBL subwoofer corresponding to one of the above models with the complaint “no output” and
capacitor C6 (10uf 50v NPE) is damaged in the amplifier, replace with the following part: JBL part# 30712 (10uf 100v NPE)
General reference for location only; not all parts or designators may conform to these drawings
It is also recommended following the repair that the instructions included in bulletin #JBL9903 are followed.
Models
Serial number 120/230V
Status
Action
ARC SUB10 / DS-10
All serial numbers affected
Replace if damaged
Replace C6 with JBL part# 30712
1 5
Amplifier/Subwoofer
ARC SUB10/DS-10
TROUBLESHOOTING TIPS AND SOLUTIONS TO COMMON SERVICE PROBLEMS
For models: ARC SUB 8, ARC SUB 10
TIP# JBLTT2000-01
Complaint:
How do you replace or service any of the front panel components on the Subwoofer faceplate for model ARC
SUB 10 ?
Probable Cause:
The High level Input terminals, potentiometers, RCA jack, and switch(es) are behind a sealed cover to protect the
air-tight integrity of the cabinet enclosure.
Solution:
1)
Unplug all external cables from the subwoofer; place the cabinet on a padded surface.
2)
Remove any subwoofer grille; remove the woofer from the cabinet. Detach the two connections from the
woofer terminals.
3)
Remove all Phillips screws holding the amplifier to the cabinet; remove the amplifier.
4)
Remove all knobs, nuts, and Philips screws from the outer control section of the amplifier faceplate.
5)
Locate the sealed cover on the inside of the amplifier faceplate (see illustration); the bead of adherent must
be broken to remove the main PCB with front panel components from the plastic faceplate. This is most
easily accomplished by CAREFULLY using a box cutter, exacto knife, or similar sharp instrument. First scrape
all excess material from the three surfaces; then force the blade into the groove between the rear cover and
the faceplate. DO NOT attempt to remove the rear cover from the main PCB.
6)
When enough material is removed, the main PCB with cover can be pulled away from the faceplate,
exposing the components.
7)
After servicing, a bead of “silicon seal” or similar adherent must be applied to all surfaces where it was
removed. Reassemble the rest of the components in reverse order.
1 6
Amplifier/Subwoofer
ARC SUB10/DS-10
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