Sharp 27DV-S100 Service Manual page 69

The disc tray cannot be opened and closed.
Is the signal from the pins(70) and
No
(69) of IC504 input into the pins(1)
and (28) of IC7701?
Yes
No
Is loading motor drive voltage output
from the pins(9) and (10) of IC7701?
Yes
Is the loading motor drive voltage
No
applied to the terminal of loading
motor?
Yes
Check for mechanism and gear
engagement and breakage.
FLOW CHART No.3-1
Check the LD-RVS/FWD signal line
between IC7701 and the IC504.
Check PC 8V line.
No
Is 8V voltage applied to the pin(8) of
IC7701?
Yes
Replace IC7701.
Check the line between the IC702
and the loading motor.
The [No Disc] indication. (In case of focus error)
No
Does the optical pickup move up and
down after the disc is removed?
(Checking of symptom.)
Yes
No
Is FE signal output to the pin(21)
of IC301 when the disc is set?
Yes
No
Is FE signal inputted into the pin(150)
of IC701?
Yes
Check or replace IC701.
FLOW CHART No.3-2
See FLOW CHART NO.6
<The [No Disc] indication.
(In case focus servo does not
function.)>
Replace IC301.
Yes
Is there input signal on the pins(52),
(53), (54) and (55) of IC301?
No
Check the connection of optical pickup
cable.
Check the line between the IC301
and IC701.