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8
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Only for training and service purposes
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- 3-6 -
When laser does not light
Is IC1 pin90 voltage about 2.5V?
Has laser power source
returned to the Q5?
Flow laser current?
Both voltage of R33 is
about 1.0?
Are data transferrd form IC1?
Does voltage appear at
IC2 17, 18?
IC1 defective.
IC1 defective.
Connector defective .
IC1, 2 Defective.
Slide motor defective.
Connector defective.
LMT SW defective.
Connector defective.
Q5 defective.
laser defective
Defective laser and/or
connector.
Has pick-up returned to the
innermost position?
Does pick-up stop after
naving moved to the
innermost position?
Are input/output detected
at CON1 pin5?
R33
»
1.0V
R33
«
1.0V
OPEN
CLOSE
(Q5 collector voltage about
1.7V)
Yes
Yes
No
No
No
Yes
Yes
No
No
Yes
Yes
No
Yes
Yes
Yes