Sharp SJ-F750SP-BK Service Manual page 21

[ 3 ]
EE 03 / EH 63
(DEF-thermistor system diagnosis)
Power OFF
Remove 4P connector (flat) from
E.V. cover Assy and measure the
thermistor resistance between
and .
OK
Check the Def-thermistor
system wiring
Replace DEF-thermistor.
[ 4 ]
(Ambient air temperature - thermistor system diagnosis)
Replace LCD-PWB.
Ambient air
temperature thermistor
is installed on
LCD-PWB.
Turn power OFF. Reopen door and re-energize.
Forced defrosting (Measurement is impossible when
DEF-thermistor is set at 10°C or higher because
defrosting ends immediately)
OK
NG
Disconnect CN1 from the main PWB. Measure the
resistance between
See CHAPTER 4. (Heater resistance)
NG
Check cause of defrosting failure
· Check door packing
· Check mounting seal of E.V. cover Assy
Replace main PWB.
Resistance of 3P connector on E.V.
cover K is normal?
Check defrost heater wiring for loose
connection or disconnection.
EE 04 / EH 64
[ 5 ]
EE 07
(Defrosting diagnosis)
(Buzzer beeps continuously)
After approx. 15 sec., the voltage
measured across and of CN1
on the main PWB is equal to supplied
voltage? (e.g. 240 V)
NO
Replace main PWB.
and of CN1 on the wiring.
NO
OK?
YES
YES
9 – 4
SJF800SPSL
YES
2P connector on E.V. cover
Assy is carrying current?
YES
Replace fuse Assy.
NO
Replace defrost heater.
NO