Troubleshooting - JVC PC-X290 Service Manual

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

TROUBLESHOOTING

•
Speakers are not connected:
Check the speaker connection.
•
Wrong function is selected:
Set switch to the proper position.
•
Defective volume control:
Set the volume control to a proper sound level.
•
Defective earphone jack:
Replace the earphone jack.
•
Defect in IC404
Check voltages. Replace if necessary.
•
Defect in IC401
Check voltages. Replace if necessary.
•
Improper location of unit:
Rotate or reposition the unit.
•
Defect in IF T101:
Check resistance, voltage, and current. Replace as needed.
•
Defect AM antenna coil L103 or oscilloscope coil L104:
Replace if necessary.
•
Intermediate Frequency tuning faulty:
Readjust (see "Alignment and Adjustment").
•
RF tracking faulty:
Readjust (see 'Alignment and Adjustment").
•
Defective IC101:
Check voltages. Replace if necessary.
•
Defective IC102:
Check voltages. Replace if necessary.
•
Poor contact in antenna circuit:
Check resistance and resolder.
•
FM antenna not connected:
Connect the built-in or external antenna.
•
Defective band selector switch:
Replace or repair the switch.
•
Defective IC101:
Check voltages. Replace if necessary.
•
Defective IC102:
Check voltages. Replace if necessary.
•
Intermediate Frequency tuning faulty:
Readjust (see "Alignment and Adjustment").
•
Poor contact in FM antenna circuit:
Resolder or repair as required.
•
Dirty capstan or head:
Clean the capstan or head with alcohol.
•
Irregular cassette tape winding:
Replace tape.
•
Defective IC201:
Check voltage. Replace if necessary.
•
Defective L203:
Check voltages. Replace if necessary.
•
Cassette erasure prevention tabs broken out:
Replace tape or cover tab openings with adhesive tape.
•
Disc is inserted upside down:
Insert disc correctly.
•
Disc is dirty:
Wipe clean with a soft cloth.
•
Disc is scratched:
Use a new disc.
•
Disc is seriously warped:
Use a new disc.
Cause and Remedy
PC-X290
30/MAR/2004
5