Sony SRG-300SE, Service Manual

Page: 60 / 84

3-2 (E)
SRG-300SE/301SE
3-2. Power Trouble
No No
Yes
Yes
Is the fuse (F1801) on the
SY-437 board disconnected?
No
Is the harness between the
SY-437 board and LED-530
board connected correctly?
Yes
“No” or the fuse is disconnected again after replacement.
Yes
Is a voltage of 3.3 V on the
SY-437 board output from
pin-1 of CN1202 normally?
No
Yes
Replace the SY-437 board.
(Refer to Section 1-4-5.)
Replace the SY-437 board.
(Refer to Section 1-4-5.)
F1801
CN1202
SY-437 board (Side B)
Replace the fuse.
(Refer to Section 5.)
Connect the harness correctly.
If there is any abnormality,
replace it. (Refer to Section 5.)
Is a power supply of 12 V ( 10%)
output normally from the AC
adaptor alone?
Does this unit receive a power
supply of 12 V (
10%) normally
from the AC adaptor?
Replace the AC adaptor.
Replace the LED-530 board.
(Refer to Section 1-4-6.)