Service manual

CB-30
CB TROUBLESHOOTING
Start
1. No Power
Plug receiver
into AC source.
Replace
FX3401.
Replace
FX3402.
Check RX3423.
Replace TX3401 if
necessary.
Check DX3406,
DX3407, CX3410.
Replace ICX3412
if necessary
Replace
ICX3402.
Yes
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Replace
IC6000.
Check +15VSB
supply at CX3428.
Check ICX3401.
Check Q3402 &
Q3405.
Replace
IC2200.
Refer to shutdown
troubleshooting.
No
No
No
No
Yes
Yes
Yes
Yes
Is AC
connected?
Does FX3401
conduct?
Is B+ present at
CX3420?
Does FX3402
conduct?
Is pin 3,
ICX3412
switching?
Is +12VSB
present across
CX3427?
Is +5VSB
present across
C3426?
Does pin 32,
IC6000 emit a
DC pulse at
startup?
Is +9VSB
present across
C3429?
Is +9VSW
present across
CX3436?
Is Horz & Vert
drive present on
pins 13, 14, 19,
IC2200?
Are ICX3406
and ICX3403
OK?
No
Yes
Replace
ICX3403,
ICX3406 as
necessary.