Disc Presence/Absense Judgment - JVC TH-A25 Service Manual

5.2.4 Disc Presence/Absense Judgment

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