Sharp DV-NC100X, Service Manual

Page: 26 / 117

1-10-4
H9745TS
2. DVD Section
Yes
No
FLOW CHART NO.1
The key operation is not functioning.
Are the contact point and the installation state of
the key switches (SW2020, SW2021, SW2022) normal?
When pressing each key switches (SW2020,
SW2021, SW2022), do the voltage of each pin
of CN1051 (shown below) change to "H" (3.3V)
from "L" (0V)?
SW2020
→
CN1051 24PIN
SW2021
→
CN1051 26PIN
SW2022
→
CN1051 25PIN
Check the key switches (SW2020, SW2021,
SW2022) and their periphery, and service it if
defective.
No
Re-install the key switches (SW2020, SW2021,
SW2022) correctly or replace the poor switch.
FLOW CHART NO.2
No DVD operation is possible from the remote control unit. (Operation is possible from the unit.)
Replace the RM2001 (remote control receiver).
Replace remote control unit if needed.
Check the line between the RM2001 (remote
control receiver) and Pin(22) of CN1051, and
service it if defective.
Is the "L" pulse sent out from Pin(1) terminal of the
RM2001 (remote control receiver) when the remote
control unit is activated?
Is the "L" pulse signal supplied to Pin(22) of
CN1051?
Replace the DVD Main CBA.
Yes
Yes
Replace DVD Main CBA.
Yes
Yes
Is 5V voltage supplied to Pin(3) terminal of the
RM2001 (remote control receiver)?
Yes
No
Check AL+5V line, and service it if defective.
No
No
FLOW CHART NO.3
The disc tray cannot be opened and closed. (It can be done using the remote control unit.)
Does the voltage of Pin(24) on CN1051 become
3.3V when pressing "OPEN/CLOSE" button on
the unit?
Refer to "FLOW CHAR NO.4" <The disc tray
cannot be opened and closed.>
Replace the "OPEN/CLOSE" button (SW2020).
No
Yes
FLOW CHART NO.4
The disc tray cannot be opened and closed. (It can not be done using the unit and the remote control unit.)
Replace the DVD Main CBA.
Original DVD Main CBA is poor.
Replace the DVD Mechanism.
No improvement can be found.
No