Sony HKDV-900, Maintenance Manual

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2-17 (E)
HKDV-900
(5) Black-colored LEDs in the following figure do not light properly.
2-3. Troubleshooting
A D
D A
G G
E
F
C
B
F
E
B
C
Is the harness between CN401 (A-3) on the
CP-364 and CN2 (A-1 : B side) on the
CP-365 boards properly connected?
Connect harness connectors properly and
recheck them
OK
Is WR signal of control IC (IC308 (F-2) on
the CP-364 board) proper?
NG
NG
OK
Connection defect between IC200 (G-1) and
IC308 on the CP-364 board
OK
Is output signal (ON :
+
3 V to
+
4 V/OFF :
GND) of control ICs (1Q1 to 2Q3 of IC308
on the CP-364 board) proper?
Is power supply (anode : + 2 V) to LED proper?
NG
IC308 defect on the CP-364 board
NG
Defect of resistor block (on CP-365 board)