Hitachi P50H401/DW3-U Service Manual page 130

TROUBLESHOOTING THE 50AE1 PANEL
SDRU
SDRD
YSUS
CN32
[YSUS - XSUS]
13
-Vs
12
-Vs
11
NC
10
GND
9
NC
8
Vcc
7
NC
6
Vx
5
NC
4
GND
3
NC
2
Vs
1
Vs
(1)
Remove SDR from the following
two connectors of Y-SUS.*
CN34 CN35
On CN801 on SDRU,
or CN811 on SDRD,
short circuit in following
connection?
(2)-(6), (20)-(24),
(28)-(30), (46)-(50)
N
X-BUS board
CN63 (1)-(9)
are shorted.
N
CN63 (1)-(9)
Y-SUS board
CN32 (1)-(4) pins or
CN32 (6)-(4) pins or
CN32 (8)-(10) pins or
CN32 (10)-(13) pins
are shorted.
N
(2)
128
*For procedure to remove SDM,
Refer to Chapter 5.3
Y
Y
Remove the six XFPCs
(Disconnect CN61, CN62, CN63, CN64, CN65, CN66)
Y
X-BUS
X-BUS board is
board
N
X-BUS
board
CN63 (1)-(9)
N
Y
Y-SUS board is
defective.
Switching circuit (power supply)
has a short-circuit.
SDU or D is
defective
defective.
Y
X-SUS board
is defective.
X-BUS board
is defective.
PANEL chassis
is defective.
End of analysis