Hitachi GCR-8480B User Manual page 10

F. TOC isn't read.
Is the Focus Servo ON?
(Does FEO (TP15) signal
appear?)
YES
Is the Tracking Servo ON?
(Does TEO (TP14) signal
appear?)
YES
Does RFI signal appear?
YES
Is Spindle Servo ON?
(Does SP0 signal (TP25)
appear?)
YES
Is TOC area on the disc
read? (Does LED flicker?)
YES
Normal
Does A, B, C, D signal
NO
appear at IC102 pin
?
8
YES
Replace IC102.
NO
Does E, F signal appear
at IC102 pin ,
9
NO
Does RFIN signal appear
at IC102 pin ?
6
YES
Replace IC102.
NO
Replace IC501.
NO
Does the other disc
operate normally?
YES
Disc is defective.
NO
,
7
NO
?
10
NO
NO
Replace Main Circuit
Board or MD Ass'y.
Refer to C.
(The Laser of Pick-Up
doesn't light.)
29