8.
GUIDES FOR SERVICING
Is
the
EF
balance adjustment OK?
YES
Proceed to the tracking circuit
flowchart.
'--~~~~--.~~~~~-'NO
Proceed to the feed circuit
flowchart.
Proceed to the disc circuit flowchart.
Check the pickup.
(Din
on lens,
laser power measurement:
90 -
120
/.1
W)
Check the audio circuit.
Proceed to the control circuit flow-
chart.
Power ON
YES
Does the LED flash normally?
YES
Is the SEGA CD Il/MEGA CD Il NO
introduction picture normal?
YES
Does the control picture appear
when the start button is pressed?
YES
Does the cursor move?
YES
Does
the counter read "00:00"
when the CD door is closed?
YES
Is the
TOC
read? (Sec the flowchart NO
on page
IO
until the TOC is read)
YES
Can
the first track
of
test CD be
played?
YES
ls
the TP-RF at IC402-
®normal?
-
NO
YES
Can each track
be
searched cor-
rectly?
YES
ls
the sound output?
YES
Check general operation.
YES
Is each operation in the control
picture nonnal?
YES
OK
YES
Check the control circuits.
Check the control circuits.
Check the control circuits.
Check the control circuits.
Check the control circuits.
NO
.-----@
NO
Refer to pagel2.
Does
the disc rotate?
YES
ls
the tracking loop engaged?
IC403-@
1..--
Servo ON
vm
-1liill\lllllo
(ls the wavcfonn
of
IV
/div.,
05s/div. observed?)
NO
Proceed to the tracking circuit
flowchart.
Is an RF wavcfonn
of
approx.
l .SVp-p observed at IC402- ®
TP
RF.
-
NO
Check RF circuit IC402 and pickup
(din on lens, etc.).
Proceed to the disc circuit
flowchart.
YES
11
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