Casio PZ-3100, Руководство по обслуживанию

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1
Is +3.2 V lines normal ?
No
Yes
*
RESUME switch (SW101) off position.
*
Q106, Q107 or Q108 is defective.
*
Check circuit around IC101 and IC104.
Is the waveform
at IC104 pin 28 like that
shown in fig. 1 ?
No
Yes
*
IC101 is defective.
*
Check circuit around IC101 and IC104.
Does 5 MHz clock pulse
appear at IC104 pin 29 ?
No
Yes
*
Crystal (X102) is defective.
*
IC104 is defective.
*
Check circuit around IC104 and X102.
*
IC104 is defective.
*
Check circuit around IC104 and
CN102 for loose soldering and heat
seal connecting.
Repair Item 1: At power on, “00” is not displayed.
Repair Item 2: “-- --” is displayed instead of playing first song track.
2
Check how much times it takes until “-- --”
is displayed after PLAY button is pressed.
A B
About
14 sec
Over
14 sec
Figure 1
3.2 V
Power on
5