Sharp SJ-F750SP-BK Service Manual page 22

SJF800SPSL
[ 6 ]
EE 08 / EH 66
(F fan motor system diagnosis)
Turn OFF and ON power.
F fan motor
rotates?
YES
Check cause of defrosting
failure
· Dislocation of fan
· Check door packing
· Installation of E.V. cover Assy
· Defective seal
Fan locked?
YES
Check position of fan.
Measure voltage between
of CN5 on the main PWB.
CN5 - : Approx. 14 V
- : Approx. 2~4 V
NO
Replace main PWB.
Replace F fan motor.
[ 7 ]
(C fan motor system diagnosis)
Measure voltage between
of CN5 on the main PWB:
Approx. 9 to 13 VDC?
NO
Loose connection or disconnection of
C fan motor system (motor connector
voltage)
Replace C fan motor.
NO
Adjust and power ON again.
YES
and
Replace main PWB or C fan motor.
EE 09 / EH 67
and
NO
YES
(If OK)
NO
Fan locked?
YES
9 – 5
[ 8 ]
EE 10 / EH 68
(R fan motor system diagnosis)
Measure voltage between and
7 8
of CN4 on the main PWB:
Approx. 9 to 13 VDC?
YES
Loose connection or disconnection of
R fan motor system (motor connector
voltage)
(If OK)
Replace R fan motor.
NO
Fan locked?
YES
Adjust and power ON again.
Replace main PWB or R fan motor.
NO