Power Can Not Be Turned On - Hitachi CPX1 Service Manual

Power can not be turned on

Are
voltage
supplied at pins (7)
and (11) of E800 on the PWB
assembly MAIN in standby
mode?
YES
Are
voltage supplied
at pins (1) and (6) of E800
on the PWB assembly
MAIN in standby
mode?
YES
What are the state
of LAMP (D303) and TEMP
(D302) indicator?
Not light blink (D303)
Measure
resistance*
between pins (1) and
(2) of S801 when the
lamp door is
secure.
0Ω
PWB assembly MAIN
CPX1(M1-20)
*: Be sure to unplug the power cord before measuring resistance.
NO
between pins (7) and (11) of
(7): GND
(11): +6.0V
from power unit circuit, and
NO
between pins (1) and (3),
and between pins (4) and
(1): +15V
(3): GND(for +15V)
(6): +17V
(7): GND(for +17V)
else
Open
Lamp door
Re-attach lamp
door
Re-attach PWB
assembly MAIN
Measure
resistance*
E800.
Open
Disconnect TSW
measure resistance of
TSW.
Short
Power unit (circuit)
Mea-
sure resistance*
(7) of E800.
Open
Power unit (circuit)
Go to the next page
12
0Ω
PWB assembly MAIN
Power unit (circuit)
Open
Termal switch (TSW)
Fuse on the power unit
(circuit)
0Ω
PWB assembly MAIN
Power unit (circuit)