TROUBLESHOOTING
Circuit Symptom Cause and Remedy
General No sound •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.
•Mute function is active:
Release it by remote control.
AM No sound, weak sound
(Low sensitivity) •Improper location of unit:
Rotate or reposition the unit.
•Defect AM antenna coil or oscilloscope coil:
Replace if necessary.
•Intermediate Frequency tuning faulty:
Readjust (see “Alignment and Adjustment”).
•RF tracking faulty:
Readjust (see “Alignment and Adjustment”).
•Defective TA2111
Check voltages. Replace if necessary.
•Poor contact in antenna circuit:
Check resistance and resolder.
FM No sound, weak sound
(Low sensitivity) •FM antenna not connected:
Connect the built-in or external antenna.
•Defective band selector switch:
Replace or repair the switch.
•Defective TA2111:
Check voltages. Replace if necessary.
•Intermediate Frequency tuning faulty:
Readjust (see “Alignment and Adjustment”).
•Poor contact in FM antenna circuit:
Resoled or repair as required.
CD Cannot read the table of
contents,
no display,
no sound.
•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.
•A non-standard disc has been inserted:
Use only a brand name disc.
•Moisture has formed inside the CD Pick-up Head:
Wait about 20 to 30 minutes.
•Defect in the servo control board:
Replace or repair as required.
•Defect in the pickup mechanism:
Replace as required.
