Sega CD II User Manual

8-2. Tracking Circuit Flowchart
Are IC409-CDl@/@9V?
1---~ Check the power circuit.
YES
....------.1..-------. YES ....-------------.. YES
Is the TOC read? (Page
IO)
1---~ Can all tracks be searched precisely?
1..-------....-------' NO
NO
Docs the waveform shown below NO Check the pickup
(din on lens. laser
appear at TP-X?
1---M power 90-120 µ. W) and tracking
: Servo
OFF Servo ON .__ci_rc_u_it_ . -----------'
Vrcf
Approx. 2V
YES
Does the waveform shown below
NO ....---------------.
appear at IC403- @? 1---~ Check tracking circuit (IC403).
Servo
OFF I Servo ON
......
v~r ---i""'
YES Tracking is OK. Proceed to the feed
circuit flowchan.
8-3. Disc Circuit Flowchart
NO
Are IC409-CD/ @/@9V?
1---M Check the power circuit.
YES
NO
Is the disc stopped in the stop mode? 1---M Is IC403-@2.5V ?
YES
Does the disc tum 1-2 seconds after
SW401
is set to ON from OFF?
YES
Check IC409.
NO
OK
Proceed to the feed circuit flowchan.
YES
NO
Is it +3V between IC409-@ and @? 1---~ Docs the following waveform
appear at
IC403-®? (Page IO [9])
Docs the disc stop immediately
when the stop button
is pressed?
YES
OK
YES
Check the disc motor
(MSOI) and its
connections.
Check the disc motor (M501) and its Is it -3V between
IC409-@ and@
connections. ---1 when the stop button is pressed?
Check the path between
IC403-®
and IC409-@, and also check
IC409.
NO
.._Y_ES~ ls IC403-® +IV when the stop
button
is pressed?
NO
YES
Check the connection between
IC403-® and JC409-@ , and also
check IC409.
Check IC401 and disc circuit 1C403.
13

Sega CD II Specifications

General

Brand	Sega
Model	CD II
Category	Game Console
Language	English