LG FFH-185A Service Manual page 12

B
Laser lights.
Does lens move up/down?
Confirm
Does Test Pin RF signal appear even in
initial low level?
read with
disc
Is laser output adjustment correct?
Does FOK(focus ok) signal appear?
IC501 Pin
74
IC501 pin
(FOK)
NO
YES
YES
YES
(RF)
40
YES
C
Does IC 501 out focus
search signal?
IC 501 pin (FEO)
48
YES
Is focus search signal
applied to pin , of
13
16
PN502?
YES
NO
NO
NO
- 2-6 -
NO
Defective IC501
NO
Defective IC502
Open activator and/or
connector.
Open connector and/or
defective IC 501.
Incorrect turntable height.
Degraded laser diode.
Defective IC 501.