Troubleshooting - Usl JSD-80 Manual

Section 11: Troubleshooting
PROBLEM
SOUND SYSTEM
DOES NOT WORK
and no LEDs are lit on
the Front Panel.
SOUND SYSTEM
DOES NOT WORK and
+5 V and +/-12 V LEDs
on the Front Panel are
lit.
Note: the Backup Pow-
er LED should be lit to
indicate operation of the
Backup Supply.
NO SOUND IN ONE
OR MORE FRONT
CHANNELS
NO SOUND IN
SURROUND
CHANNEL
3rd Edition. February, 2006
CHECK
Power source
Power cord
Power supply fuse
Power amplifi ers
Change-over
Exciter lamp
Stereo solar cell on
projector
LED indicators on
the INPUT
and OUTPUT
modules
Turn off main
power switch to
put unit in BYPASS
mode. Note: This
mode puts sound
in all three front
channels.
Turn off main power
switch to put unit in
BYPASS MODE.
Press other Format
switches.
Power amplifi er
Speakers or wiring
Page 35
SOLUTION
Reset circuit breaker or replace fuse.
Make sure power cord is fi rmly seated.
Replace Fuse - SLO BLO 500 mA, 250 V
Make sure amplifi ers are operating and volume
controls are up.
Switch change-over to operating projector.
LED lights on the Input Module indicate which
projector is in use.
Replace bulb or repair exciter supply.
Make sure the solar cell is illuminated and
clean. Use compressed air. DO NOT USE
ORGANIC SOLVENTS OR ALCOHOL.
Make sure the Input Module's indicator
LEDs are fl ickering with program material.
If not, there is a problem with the solar cell,
the wiring, or the Preamp. If indicator LEDs
are fl ickering, the problem is most likely
the unit wiring, the power amplifi ers, or the
loudspeakers.
If sound comes out of the three front speakers,
then the problem is in the JSD unit. If there is
no sound, the problem is somewhere else.
If the channel or channels are still dead, the
problem is an amplifi er, speaker, or wiring. If all
front channels work, then the problem is in the
JSD unit.
Check different formats to determine if only one
format has a problem. Refer to later section in

TROUBLESHOOTING.

Replace speaker fuse or main fuse. Replace
amplifi er.
Speakers are often series-connected, so if one
fails they all will not work.
If NON/SYNC MUSIC plays but the STEREO does
not, there is a problem in the soundhead wiring.
USL, Inc. JSD-80 Instruction Manual