JVC TH-A25 - Disc Presence;Absense Judgment

(No.MB141)1-21
5.2.4 Disc Presence/Absense Judgment
Disc Presence Judgment
Turn On Laser
Does lens move
with UP/DOWN
full stroke in focus
direction?
Is focus search
voltage developed
at pin 11 of SIC1
Check PI
(pin36 of RU1)
signal and FE
(pin42 of RIC1)signal
Y
N
N
N
No Disc OK
Check connection between RIC1 and RCN1.
Check BUS line RIC1and SIC1.
Check RIC1
Check
peripheral
circuit of DRIC1
Check BUS
line between
SIC1 and MIC1
Y
YNo signal
Normal
Disc is presence
4