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Before assuming that your CR-420 is faulty, check this trouble-shooting list. It details many steps
you can take yourself without having to call a service representative.
AUDIO SECTlOfy
Fault
Cause
Cure
No power although POWER switch in ON (POWER
LED unlit).
AC power line not plugged-in to supply socket.
AC main fuse has blown.
Plug firmly into the supply socket.
Contact your service representative for a replacement.
No sound although power is connected.
Volume too low.
Turn up volume.
INPUT SELECTOR in wrong position.
Check and change as necessary.
Input pin plugs incorrectly inserted, loose, or disconnected.
Check and insert fully in the correct positions.
Speaker connections faulty.
Check and make good.
Both SPEAKERS push-buttons non-depressed.
Depress one or both (A, B, or A + B).
Sound comes only, or mainly, from either L or R
Speaker connections faulty.
Check and make good.
speaker.
Input connections faulty.
Check and make good.
BALANCE control not properly adjusted.
Set to give correct stereo balance.
Sound suddenly ceases during audition.
The protective circuit has gone into operation.
Check for incorrect (too low) speaker impedances or short
circuits and correct.
If the fault persists, switch off and wait briefly before switching
on again.
AC main fuse has blown.
Contact your service representative for a replacement.
Poor bass response and badly defined stereo image.
Speaker + and — connections are incorrect.
Reverse the connections to one speaker, not both.
A loud 'hum' is heard with or instead of, the record
when attempting PHONO audition.
Either the pin-plugs from the phono cartridge are not firmly
plugged into the input sockets, or the braided shielding wire
is defective.
Plug in firmly, replacing the defective shielding if necessary.
Check and make good the GND (ground) wire connection.
The volume control cannot be raised during record
audition without a loud 'booming' noise.
This is caused by feedback of sound from the speakers to the
phono cartridge stylus, and is called 'howling.'
Increase the separation between turntable unit and speakers,
avoiding locations directly in line with the speakers.
Bass and treble frequencies are unnaturally exaggerated.
The LOUDNESS volume control is set too low.
Turn to the FLAT position (fully clockwise) and reset main
and LOUDNESS volume controls according to the instructions.
Your tape recorder does not record the program you
are monitoring.
The REC OUT selector is not set to the required program
source.
Turn to the required setting.
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