Trouble Shooting - JVC RC-BX30 Service Manual

Trouble shooting

Circuit Symptom
General No sound
MW No sound, weak
sound
(Low sensitivity)
SW 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 display, no sound
Cause
Speakers are not connected.
Wrong function is selected.
Defective volume control
Defective earphone jack
Improper location of unit
Defect in IFT102
Defect MW antenna coil L102 or
oscilloscope coil L105
Intermediate frequency tuning faulty
MW tracking faulty
Defective IC101
Defective Q101, Q102, Q103, Q104, Q105
SW antenna not connected
Defect in IFT102
Defect SW antenna coil or oscilloscope coil
Intermediate frequency tuning faulty
SW tracking faulty
Defective IC101
Defective Q101, Q102, Q103, Q104, Q105
FM antenna not connected
Defective band selector switch
Defective IC101
Intermediate frequency tuning faulty
Poor contact in FM antenna circuit
Dirty capstan or head
Irregular cassette tape winding
Defective IC201
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.
Defect in the servo control board
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.
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.
Connect the built-in external antenna
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.
Connect the built-in external antenna
Replace or repair the switch
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.
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.
Replace or repair as required.
Replace as required.
RC-BX30
1-17