Service manual

CB-32
CB TROUBLESHOOTING
3. No Tuning
Start
Are all tuner
voltages
present? (Refer
to schematics.)
Check tuner
power supplies.
Is IF present at
pin 11, WT1200?
Does changing
the tuner fix the
problem?
Check clock and
data lines.
Replace IC6000
if clock & data
lines OK.
Is IF present at
pins 5, 6,
IC1200?
Check IF line.
Replace U1200
if necessary.
Is IF present at
pin 17, IC1200?
Check IC1200
power supplies.
Replace IC1200
if necessary.
Refer to No Audio and No
Video Troubleshooting.
Yes
No
No
No No
No
Yes
Yes
Yes
This procedure may be
applied to the 2nd tuner
section as well.