Open Close - LG LAC-M7600 Service Manual

A
When laser does not light.
Is "2.4V~3.4V" applied to
pin42 of IC506?
➀ 3.4V ➁ 2.4V)
(
OV
Did pickup return to
innermost circular?
Does it stop at inner pick
circular after shift?
YES
Is power supplied to laser Q501?
(Q501 collector: about 1.8V)
NO
NO
Is data transferred
YES
Does voltage appear at
IC504 Pin 13, 14?
Is defect output from LMT
SW applied to 68 of IC510?
YES
OPEN
NO
from IC510
YES
NO
YES
CLOSE
YES
NO
- 2-4 -
Defective MICOM (IC510)
Defective IC506.
Defective slide motor and/or
connector. (PN504)
NO
Defective LMT SW and/or
connector. (PN504)
Defective MICOM. (IC510)
Defective IC506