Epson PX-8 Technical Manual page 242

REV.-A
Check KSC and KRTN
lines for those keys
for discontinuity.
Check continuity of
that line. Measure line
resistance with diodes
in forward direction.
N
N
N
All keys cannot be
typed in.
Examine continuity of
FPC cable signal lines
'including connector
contacts.
N
N
Replace bad diode.
5-41
Check KSC and KRTN
lines for that key for
any short circuit with
another signal.
y