Hitachi P50H401/DW3-U Service Manual page 132

TROUBLESHOOTING THE 50AE1 PANEL
Connect CN23(X-SUS),
Connect SDR U /D (with CN34 and CN35)
Connect CN 26 (X-SUS).
Turn off the AC power.
Connect CNR3(ABUSR)
(3)
CN32(Y-SUS), and
Vsago turns on
On PSU board
Vcc (5V), Vs(85V),
Va(65V) exists ?
Y
Turn off AC power
Vsago turns on
On PSU board
Vcc (5V), Vs(85V)
exist ?
Y
Turn off AC power.
Vsago turns on
On PSU board
Va (65V) exists ?
Y
Vsago turns on
(4)
N
Logic board or X-SUS board or
In case that Vs Power system or Va Power
system of X-SUS or Y-SUS is defective, Vcc
starts but goes down in a few seconds.
Turn Off AC power and disconnect YFPC
N
from CN812, CN822, CN823,
CN831, CN832, CN833, and Turn on AC power.
PSU board
Vcc(5V), Va (65V)
exists ?
Y
Turn off AC power.
And remove ADMs from following connectors
N
CNR4, CNR5, CNR6, CNR7
Reapply power, Vsago turns on
On PSU board
Va (65V) exists ?
Y
130
Y-SUS board is defective.
N
SDR U or D board is defective
YFPC or Panel is defective
N
ABUSR board is defective.
ADM is defective
(Panel chassis is defective.)
ADM (Connector with COF attached)
Turn off AC power, End of analysis