Panasonic JB-3300 Technical Manual page 322

7. TROUBLESHOOTING
This is the troubleshooting method when operation of the
unit correspond-
Troubleshooting
(1)
A) Connection Check for
Check Broken Wires
Yes
Replace Connection Wire
No
B) Self-Test . p : Input reset signal from unit
Check urn on rower : Request self-test from unit
Code is OUtput
Self-Test OK
Troubleshooting 2)
Check Pattern if
Output Waveform
is not Available
Check Output of IC (Note 3) Found Repair Shorted
Connected to Microprocessor Check for Short Location
Scan Output
Check Pattern if : 4
No
i s Mad me} Output Waveform Microprocessor or
Output 1s Made is not Available P
: Ic Connected to
Microprocessor is
Defective
Press Keys and
Check Microproces-
sor Input (Note 3)
Matching the Matrix
Repair Short and
Breakage
Check
for Short and
Breakage
Found
IC which does not
Is Input Made?
> Output is Defective
Defective Flexible Pattern (Pattern Breakage, Defective
Soldering, etc.), Key Unit, Diode, Composite Resistors,
Composite capacitors, or Microprocessors
Figure 7-1 Troubleshooting
IV - 22