Hitachi CP-X880 Service Manual page 13

DC fan malfunction
Measure the voltage
at each pin
Set AC to ON and
enter standby status
The voltage is
H (3.3V)
Turn on the
power supply and check
the voltage
The voltage
(about 1 sec.)
H (3.3V)
OK
Check the fan connector
connection
FAN
NG
Connector connection
CP-X880/CP-X885
Lamp does not light
What is the state of
LAMP indicator D302
during operation?
Not light
Connect
NO
E302 (for PWB
assembly Sensor)
H (3.3V)
DC FAN
INTAKE B : E801 1
INTAKE G : E802
1
INTAKE R : E803 1
EXHAUST : E804
1
EXHAUST(POWER) : E809
LAMP : E808
1
Infinity
PWB assembly
Sensor
once
Normal
to L (0V)
about 1 sec.
H
OK
AC ON Power ON
H
NG
Light
Change the lamp.
Does lamp light?
Not light
Is the
voltage at collector
of Q801 on the PWB assembly
Drive fixed to "L" during
warming-up?
NO
Power unit (ballast)
Blinks
What is the state of
Is E302
(PWB assembly Sensor)
surely connected with
PWB assembly Drive
by the cable?
at pin
YES
the PWB assembly Drive
Measure
sure voltage at
the 2 of I256 on the
PWB assembly
Drive.
L (0V) Power unit (ballast)
1
Measure
the resistance of
TH950 on the PWB
assembly Sensor at
disconnecting
E302.
about 4.7k
PWB assembly Drive
13
Light
Lamp
YES
PWB assembly Drive
"L" = 0V
Power unit (circuit)
TEMP indicator
D301?
Not light
Is the voltage
3 of E805 on
NO
set to "L" during
"L" = 0V
warming-up?
YES
PWB assembly Drive