(No.MB330)1-23
SECTION 5
TROUBLESHOOTING
Ciruit
Symptom
Cause and Remedy
General
No sound
Defect in IC801
Check voltages. Replace if necessary.
Defect in IC301
Check voltages. Replace if necessary.
AM
No sound, Weak sound
(Low sensitivity)
Defect in IF T101, T102, T103
Check resistance, voltage and current. Replace as needed.
Defect AM antenna coil T106 or oscilloscope coil T104
Replace if necessary.
Intermediate frequency tuning faulty
Readjust.
RF tracking faulty
Readjust.
Defective IC101
Check viltagese. Replace if necessary.
FM
No sound, Weak sound
(Low sensitivity)
Defective IC101
Check viltagese. Replace if necessary.
Intermediate frequency tuning faulty
Readjust.
Tape
No sound/Recording,
Unsteady tape sound, Weak sound
Dirty capstan or head
Clean the capstan or head with alcohol.
Defective IC201
Check voltages. Replace if necessary.
Cassette erasure provention tabs broken out
Replace tape or over tab openings with adhesive tape.
CD
Cannot read the TOC.
No sound
Moisture has formed inside the CD deck
Waite about 20 to 30 minutes.
Defective IC601
Check voltages. Replace if necessary.
Defective IC602
Check voltages. Replace if necessary.
Defective IC603
Check voltages. Replace if necessary.
Defective IC605
Check voltages. Replace if necessary.
Defective IC606
Check voltages. Replace if necessary.
Defective IC608
Check voltages. Replace if necessary.
Defective IC609
Check voltages. Replace if necessary.
Defective IC610
Check voltages. Replace if necessary.
Defective IC611
Check voltages. Replace if necessary.
Defect in the CD pickup mechanism
Replace as required.
