Panasonic JB-3300 Technical Manual page 323

Check Pin of
Micro-
processor
Level is Low?
Check if Key
Data is Output
Key Data No
is Output?
Check Pin 1
of Micro-
processor
. No
Level is High?
Check if Clock
Pulse is Out-
put
Clock No
Pulse is
Output?
Check for Short
and Wire Breakage
to Connector Section
Yes
]
Recheck from
Beginning
No
Repari Short
or Wire
Breakage
Note: See the circuit diagram.
Figure 7-1 Troubleshooting