Hitachi CP-SX635W, Service Manual

Page: 14 / 102

14
CP-SX635(ED3SX40N)
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?
Are
voltage supplied
at pins (2) and (7) of E800
on the PWB assembly
MAIN in standby
mode?
NO
YES
(9): +6.0V
(12): +4.0V
(14): GND
Does
LAMP (DK03) or
TEMP (DK02) indicator light
or blink?
YES
(2): +15V
(4): GND(for +15V)
(7): +17V
(11): GND(for +17V)
*: Be sure to unplug the power cord before measuring resistance.
Measure
resistance* between
pins (9) and (14), and
between pins (12) and
(14) of E800.
Disconnect TSW
from power unit circuit, and
measure resistance of
TSW.
Open
0
Ÿ
PWB assembly MAIN
Power unit (circuit)
Thermal switch (TSW)
Open
Power unit (circuit)
Fuse on the power unit
(circuit)
NO
Measure
resistance* between
pins (2) and (4), and between
pins (7) and (11) of
E800.
0 Ÿ
PWB assembly MAIN
Power unit (circuit)
Power unit (circuit)
Short
Open
Go to the next page
YES
PWB assembly SW
E808, E941
Open
Lamp door Re-attach lamp
door
Measure
resistance*
between pins (1) and
(2) of E808 when the
S941 is pushed.
PWB assembly MAIN
0
Ÿ