Hitachi CP-X807(EDX50WL) Service Manual page 14

Power can not be turned on
Are
voltage
supplied at pins
(9),(12) and (14) of E800 on
the PWB assembly MAIN in
standby mode?
(9): +6.0V
(12): +4.0V
YES
(14): GND
Are
voltage supplied
at pins (2) and (7) of E800
on the PWB assembly
MAIN in standby
mode?
(2): +15V
(4): GND(for +15V)
YES
(7): +17V
(11): GND(for +17V)
Does
LAMP (DK03) or
TEMP (DK02) indicator light
or blink?
Measure
resistance*
between pins (1) and
(2) of E808 when the
S941 is pushed.
0Ω
PWB assembly MAIN
CP-X807(EDX50WL)
*: Be sure to unplug the power cord before measuring resistance.
resistance* between
NO
pins (9) and (14), and
between pins (12) and
Disconnect TSW
from power unit circuit, and
measure resistance of
Power unit (circuit)
resistance* between
NO
pins (2) and (4), and between
pins (7) and (11) of
Power unit (circuit)
YES
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Open
PWB assembly SW
E808, E941
Lamp door Re-attach lamp
door
Measure
0Ω
(14) of E800.
Open
Open
TSW.
Short
Fuse on the power unit
Measure
0Ω
E800.
Open
14
PWB assembly MAIN
Power unit (circuit)
Thermal switch (TSW)
(circuit)
PWB assembly MAIN
Power unit (circuit)