Roadstar CDR-4611 UDMP, Service Manual, Page: 8 / 24

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.