Audio Section - Yamaha CR-840 Owner's Manual

AUDIO SECTION
Fault
■
' 'Cause Cure
No power although POWER switch in ON {POWER
AC power line not plugged-in to supply socket.
Plug firmly into the supply socket.
LED unlit).
AC main fuse has blown.
Contact your service representative for a replacement.
No sound although power LED lights.
Volume too low.
Turn up volume.
ADAPTOR switch is in the ON position but no audio equip¬
ments are connected to the ADAPTOR terminals.
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 position.
Speaker connections faulty. Check and make good.
SPEAKER switch is set to OFF. TURN to the A, B, or A + B position.
Sound comes only, or mainly, from either L or R
speaker.
Speaker connections faulty. Check and make good.
Input connections faulty. Check and make good.
BALANCE control not properly adjusted. Set to give correct stereo balance.
Sound suddenly ceases. The protective circuit has gone into operation. Check for incorrect (too low) speaker impedance or short
circuits and correct.
If the fault persists, switch off and wait briefly before switching
on again.
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 This is caused by feedback of sound from the speakers to the Increase the separation between turntable and speakers.
audition without a loud 'booming' noise.
phono cartridge stylus, and is called acustic feedback. avoiding locations directly in line with the speakers.
Bass and treble frequencies are unnaturally exaggerated.
The LOUDNESS control is set too low.
Turn to the FLAT position (fully clockwise) and reset main
volume and LOUDNESS controls according to the instructions.
Your tape recorder does not record the program you
The REC OUT selector is not set to the required program
Turn to the required setting.
are monitoring. source.
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