Christie DWU851 Service Manual page 14

DWU851(DD1-WU70P/71P) / DHD851(DD1-HD70P/71P) / DWX851(DD1-WX70P/71P)
Power cannot turn on.
Is
voltage
supplied at pins (5) and
(7) of E800 on the MAIN
PCB?
YES
Listen
carefully to the
sound from the POWER
UNIT COOLING while re-
plugging the cord
after 30 sec.
Is
voltage
supplied at pins (1)
and (3), (9) and (19), (20)
and (19) of
E800?
(1) +16.8V (Normal STBY)
YES
(3) GND for (1)
(9) +5.4V
(19) GND
(20) +16.8V
DWU851/DHD851/DWX851
Service Manual
020-000755-01 Rev. 1 (11-2014)
*: Be sure to unplug the power cord before measuring resistance.
NO
resistance* between
pins (5) and (7) of
(5): +14.3V
(7): GND
Disconnect
TSW1 (CNTS1)
and TSW2 (CNTS2) from
the LAMP DOOR RELAY
PCB, and measure the
No sound
voltage supplied at
pins (9) and (19) of
Replace POWER UNIT CIRCUIT1.
Replace POWER UNIT COOLING.
the resistance*
NO
between pins (1) and (3),
(9) and (19), (20) and
(19) of E800.
0V (Saving STBY)
Replace POWER UNIT CIRCUIT1.
Measure
0
E800.
order)
0
resistance.
NG (open)
Is
NO
E800?
(9) +5.4V (Normal STBY)
YES
0V (Saving STBY)
(19) GND
or
Measure
0
Open
13
Replace MAIN PCB.
or
Replace POWER UNIT CIRCUIT1.
Replace POWER UNIT CIRCUIT1.
or
Replace POWER UNIT COOLING.
or
Replace LAMP DOOR RELAY PCB.
Replace MAIN PCB.
or
Replace POWER UNIT CIRCUIT1.
Replace MAIN PCB.
or
Replace POWER UNIT CIRCUIT1.