LG LAC-M0510, Service Manual

Page: 9 / 30

- 2-4 -
NO
NO
NO
NO
NO
NO
When laser does not light.
Is “2.4V~3.4V” applied to pin2 of IC502?
(
➀
3.4V
➁
2.4V)
Is power supplied to laser Q501?
(Q 501 collector: about 1.8V)
Is data transferred from
MICOM IC ?
Does voltage appear at
IC504 Pin 13, 14?
Defective MICOM or CN503.
Defective MICOM.
Defective IC502
Defective IC501,IC502
Defective slide motor and/or
connector.(CN501)
Defective LMT SW and/or
connector. (CN501,CN503)
Did pickup return to
innermost circular?
Does it stop at inner pick
circular after shift?
Is defect output from LMT
SW applied to Pin 4 of
PN505?
YES
YES
YES
YES
OPEN CLOSE
YES
YES
YES
A
OV