Troubleshooting – Exploded view – Circuit Diagram - JBL- ARC SUB10
and JBL- DS-10 Powered Subwoofer
Amplifier Power (RMS) 100
watts
Driver 10" . . . . . . . . . . . .. High-Polymer Laminate
Inputs . . . . . . . . . . . . . . . . Line Level and Speaker Level
Outputs . . . . . . . . . . . . . . Speaker Level (only active if Speaker Level Inputs are used)
High-Pass Frequency . . . High-Pass filter at 180Hz (only active if Speaker Level Inputs are used)
Frequency Response . . . 50Hz - 150Hz (determined by crossover setting)
Driver 10" . . . . . . . . . . . .. High-Polymer Laminate
Inputs . . . . . . . . . . . . . . . . Line Level and Speaker Level
Outputs . . . . . . . . . . . . . . Speaker Level (only active if Speaker Level Inputs are used)
High-Pass Frequency . . . High-Pass filter at 180Hz (only active if Speaker Level Inputs are used)
Frequency Response . . . 50Hz - 150Hz (determined by crossover setting)
In the event you receive a ARC SUB10 / DS-10 Subwoofer with the
complaints “Dead, or No Output, or Motor boating (Oscillation)”, perform the
steps listed below first before any further troubleshooting takes place:
1 Unplug all cables; lay the sub-woofer on a padded surface.
2 Remove all Philips screws around the outer perimeter of the
amplifier face-plate.
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.
EXPLODED VIEW
SCHEMATIC & AMP MODULE CONNECTION DETAILS
TROUBLESHOOTING
THE FOLLOWING PROCEDURES MUST BE FOLLOWED WHEN INSTALLING NEW
S53AMI/S64AMI AMP MODULES
FAILURE TO FOLLOW ONE OR MORE OF THESE STEPS MAY RESULT IN THE INSTANT DESTRUCTION OF THE MODULE WHEN POWERED UP.
FAILURE TO FOLLOW ONE OR MORE OF THESE STEPS MAY RESULT IN THE INSTANT DESTRUCTION OF THE MODULE WHEN POWERED UP.
* Align white indent marker on Amp Module with indent marker on main
PCB; alternately observe position of label on the top of the module;
incorrectly replacing the Module 180 in the PCB slot will result in its
destruction.
* All AC powered test instruments (meters, oscilloscopes, etc.) must
have a floating ground, i.e. be connected to an isolation transformer.
* Align and position the Amp Module before soldering.
* Attach the amp Module with the mounting screws or powering up.
Use only rosin-core or non-acid core solder; thoroughly de-flux the surfaces after soldering.
* Align and position the Amp Module before soldering.
* Attach the amp Module with the mounting screws or powering up.
Use only rosin-core or non-acid core solder; thoroughly de-flux the surfaces after soldering.
> Check fuse F1. If blown visually check transformer for
discoloration, and large capacitors (C1, C2) for bulges or venting. Check for
shorts with an Ohmmeter, (see schematic).
> With ohmmeter, verify voice coil of woofer is 3.9 ohms, and winding of transformer for continuity.
> Examine board and wiring for obvious damage, broken or poorly
soldered connections, or discoloration.
> Repair or replace items identified above.
> For live power testing, attach a 4 ohm 100 watt resistor to the
output wires.
> If the LED is not on, check for fuse continuity and then for cold
solder joints on CMC1 and bridge diode.
> With a signal present at the input, the output to the power amp is
at pin-8 of U1. If the signal is not present at pin 8, there is a problem with
preamp section. Most likely, a cold solder joint will be the problem. Track
back the signal path to locate problem.
> If signal present at pin 8, but still no sound, check for cold
solder joints on all power resistors, R4a and R4b and the the power amp module.
If C24 is blown, C6 is not soldered or is defective. Check the signal at R2. On
the down signal side, the voltage signal should be very small. If signal is
similar on both sides of R2, the amp module is likely defective.
> If you hear a mechanical clicking noise from the amp module, this
indicates that the short circuit protection has been engaged. Check that Q3, Q4
and Q5 are soldered correctly. Also check that Q3 is not shorted to power amp
case.
If you have to replace the power module, be very, very patient
with the solder removal from this single sided PCB. COMPLETELY REMOVE SOLDER
BEFORE TRYING TO REMOVE THE MODULE.
Crossover pot Gnd wire from PCB pad to POT barrel. (Only physical
contact required between pot body and face-plate).