— 12 —
2-A2
A2
Is Q403
emitter 8V?
Is waveform
at C964 4.7UF (FSO) like that
shown in figure 12?
No
l
Check circuit around Q403.
No
l
Check circuit around pin
16 (FSO) of IC902.
l
IC902 is defective.
Yes
Is
waveform at pins 21 to 23
of IC903 like that shown
in figure 13?
Yes
l
Check circuit around
pins 20~23 of IC903.
Yes
Yes
l
Check 15P flat cable.
l
Check focus coil of pickup
(DC resistance : 8
Ω
).
Vref
0.2 V
Vref
2.5 V
Figure 12
Figure 13
