Casio CD-311S Service Manual page 14

1. At power on, "00" is not displayed.
Is +5 V lines normal
Does 16.93 MHz
clock pulse appear at
IC502 pin 79 ?
clock pulse appear at
IC801 pin 30 ?
Check and circuit around IC801.
Check LCD.
Check wire connector.
2. "-- --" is not displayed total track numbers.
How long times it takes until "-- --" is
displayed after CD door has closed.
About
5 sec.
A
1
(for IC801)?
Yes
Yes
Does 1.4 MHz
Yes
2
Check Q510, Q511 and D510.
No
Check Q504, Q505 and D504.
Check circuit around IC801.
No
Check X501.
Check circuit around X501 and IC502.
No
Check circuit around IC502 pin 72.
About
16 sec.
B
12