Trouble Shooting - JVC UX-M55 Service Manual

UX-M55

Trouble shooting

Circuit Symptom
General No sound
MW No sound, weak sound
(Low sensitivity)
FM No sound, weak sound
(Low sensitivity)
Tape No sound/recording,
unsteady tape sound,
weak sound
CD Cannot read the table
of content.
No sound
1-20
Cause
Speakers are not connected.
Wrong function is selected.
Defective volume control
Defective earphone jack
Defect in IC402
Defect in IC301
Improper location of unit
Defect in IF T101
Defect AM antenna coil L103 or oscilloscope
coil L102
Intermediate frequency tuning faulty
RF tracking faulty
Defective IC101
Defective IC102
Poor contact in antenna circuit
FM antenna not connected
Defective band selector switch
Defective IC101
Defective IC102
Intermediate frequency tuning faulty
Poor contact in FM antenna circuit
Dirty capstan or head
Irregular cassette tape winding
Defective IC201
Defective IC202
Cassette erasure prevention tabs broken out
Disc is inserted upside down.
Disc is dirty.
Disc is scratched.
Disc is seriously warped.
A non-standard disc has been inserted.
Moisture has formed inside the CD deck.
Defective IC701
Defective IC704
Defective IC703
Defect in the CD pickup mechanism
Remedy
Check the speaker connection.
Set switch to the proper position.
Set the volume control to a proper sound
level.
Replace the earphone jack.
Check voltages. Replace if necessary.
Check voltages. Replace if necessary.
Rotate or reposition the unit.
Check resistance, voltage, and current.
Replace as needed.
Replace if necessary.
Readjust (see "Adjustment method").
Readjust (see "Adjustment method").
Check voltages. Replace if necessary.
Check voltages. Replace if necessary.
Check resistance and resolder.
Connect the built-in or external antenna.
Replace or repair the switch.
Check voltages. Replace if necessary.
Check voltages. Replace if necessary.
Readjust (see "Adjustment method").
Resolder or repair as required.
Clean the capstan or head with alcohol.
Replace tape.
Check voltages. Replace if necessary.
Check voltages. Replace if necessary.
Replace tape or cover tab openings with
adhesive tape.
Insert disc correctly.
Wipe clean with a soft cloth.
Use a new disc.
Use a new disc.
Use only a brand name disc.
Wait about 20 to 30 minutes.
Check voltages. Replace if necessary.
Check voltages. Replace if necessary.
Check voltages. Replace if necessary.
Replace as required.