Sony UDA-1 Service Manual page 23

5. When remote commander does not work
START
When remote commander
does not work.
6. When volume operation of remote commander does not work
START
When volume
NG
operation of remote
commander does
not work.
Check that the IC500 on the
NG
FRONT-R board is soldering
normal.
OK
Check that the harness which
connects FRONT-L board
(CN402) and FRONT-R board
(CN500) is normal.
OK
Check that the harness which
connects FRONT-L board
(CN401) and DIGITAL board
(CN305) is normal.
OK
Check the following parts and
the surrounding circuit, and
exchange the defective parts
or board.
DIGITAL board: IC306
Press the [VOL+]/[VOL–]
NG
buttons on the remote
commander, check that drive
signal is outputted from the
following pins (F IN, R IN).
DCDC board: CN190 pin 1, 2
OK
Check that the IC190, RV190
on the DCDC board.
OK
Exchange the DCDC board.
Check the following parts and
NG
the surrounding circuit.
FRONT-R board: IC500
Exchange the FRONT-R board.
NG
Repair the harness.
NG
Repair the harness.
Check that the harness which
NG
connects DCDC board
(CN190) and DIGITAL board
(CN308) is normal.
OK
Check the following parts and
the surrounding circuit, and
exchange the defective parts
or board.
DIGITAL board: IC306
UDA-1
Repair the harness.
23