Epson PX-8 Technical Manual page 250

REV.-A
Check signals of IC5
pins 12 and 13.
<
Are pulses observed
at those pins which
are
opposite in phase?
Replace diode 06.
N
N
Check continuity of
diode 02.
5-49
Replace transistor Q4.
Is LEO
always on?
Replace LED.
y
y
Replace C shaft.