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Laser does not light.
Is "3.5V" applied to pin80
of IC801?
YES
Did pickup return to
innermost circular?
YES
Does it stop at inner pick
circular after shift?
YES
Is power supplied to laser Q501?
(Q501 collector: about 1.8V)
YES
Does laser current flow?
(R508's voltage are 1.0V)
NO
NO
Is data transferred from
MICOM IC ?
Does voltage appear at IC
502 pin18, 19?
Is defect output from LM
SW applied to pin 5 of
PN503?
YES
OPEN
NO
YES
NO
YES
NO
CLOSE
YES
NO
»
YES
R508
1.0V
YES
«
R508
1.0V
- 2-4 -
Defective MICOM.
Defective IC501, 502
Defective slide motor and/or
connector.
Defective LMT SW and/or
connector.
Defective MICOM.
Defective connector.
Defective Q 501 and/or laser.
Defective laser and/or
connector.
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