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AUDIO SECTION
RX
No
sound
Check if
speaker wiring is
connected
properly.
OK
Check if
volume, squelch
controls are adjusted
properly.
OK
Check IC501
AF power IC and Q10.
OK
If CB
Check if Q7
voltages are as shown
in voltage chart.
OK
Check
Q6, 8, 9, and 12
voltages are as shown in
voltage
chart.
OK
Check RF section.
NG
Replace or resolder.
NG
Check volume and
wire connections.
OK
Adjust volume and
squelch control.
NG
Replace IC501 AF power IC
and/or Q10.
Change CB/WX/PA
If PA
switch to PA.
NG
Che
ck Q7 and
associated circuit.
NG
Check microprocessor
section.
NG
Replace wire or resolder.
Connect PA speaker and PTT on.
Input 1kHz signal to MIC.
Sound from
NG
PA speaker?
OK
Check voltage
of Q204, Q206,
Q208, Q209.
Check PA
speaker
or CB/WX/PA switch
connection.
Good.
PA function is good.
— 11 —
NG
Replace
defective parts.
OK
NG
Resolder.
OK
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