Casio ZD-1

1.10V
Figure 19
3-A1
Does <3 V
appear at pin 33 (LD)
of IC701 ?
* Check IC701.
* Check circuit around Q701.
* Check CN701.
* Check Q701.
* Check pickup.
No
Yes
A1
20
3-A2
Dose +9 V
appear at pins 19 of
IC703 ?
* Check circuit around IC703.
Is waveform at
pin 16 of IC703 like that
shown in Fig. 19 ?
* Check CN701.
* Check pickup.
Is waveforn at
pin 6 (FEO) of IC701 like
that shown in Fig.20 ?
No
No
No
Yes
Yes
Yes
A2
* Check circuit around
IC701.
* Check IC703.
* Check circuit around
and soldering IC703.
* Check IC701 and IC702.
750mV
Figure 20