LG LAC-M5600 Service Manual page 14

3. Initial reading is not carried out.
Slide motor moves.
(With disc)
YES
NO
Spindle motor turns.
(Refer to FIG3.)
YES (with disc)
Does RF waveform
appear at IC506 Pin
(Refer to FIG4.)
Check the Voltage change of
NO
PN502 Pin
YES
Check the Voltage change of PN506
26 42 76 77
Pins , ,
YES
Check the Data transmission
from IC510 pins
(Refer to FIG7.)
YES
Check the Data transmission
42
from IC510 pins
(Refer to FIG8.)
YES
Check the TRVP
Voltage.
(IC506 Pins
YES
Check the change of
SL +, SL – Voltage.
(IC504 Pins
Laser light check A ?
YES
Does FA+ waveform appear
at IC504 Pin 15 ?
(Refer to FIG1.)
YES
Does TE waveform appear at
R517? (Refer to FIG2.)
YES
Is rotation normal?
YES
Is there no dropout of RF signal?
- 2-3 -
NO
1 (6.4~6.8V).
NO
, . (1.4V~1.8V).
NO
58 70 72
, ,
NO
48 , 57 , 71
NO
23 )
NO
, 14 )
13
YES
Defective contact
PN501 or PICK-UP
NO
NO
NO
Defective IC506 or
YES
PICK-UP
Defective
Connector. (PN502)
Defective IC506
Defective MICOM
Defective IC506
Defective IC506
Defective IC504