Sharp FACSIMILE FO-4500 Service Manual page 56

FO-4500H
(3) Fusing malfunction
Does the Heater Lamp
turn ON when the
power is ON?
H1 check
S3 check
Is there electrical con-
ductin between
CN2-1 and CN2-3?
(4) Exit fan malfunction
Does the Exit Fan Motor
(M3) rotate when the
power is ON?
3. OTHER TROUBLE SHOOTING
(1) No Power
YES
NO
NO
Is H1 conductive? Replace
H1.
YES
Replace the
NO
Thermistat (S3)
or the Fusing Unit.
YES
Replace the Power
Unit (PWB-E) or
PWB-A.
YES
NO
NO
Replace M3.
Has the Power ON/OFF
Swicth been turned ON?
YES
Has the Power Cord been securely
connected to the printer?
YES
Has the Power Cord been securely
connected to the outlet?
YES
Has the fuse in the Power Unit
(PWB-E) blown?
YES
Replace the fuse.
TH1 check
YES
Is the Thermistor (TH1)
surface dirty?
NO
Is there electrical con-
YES
ductin between
CN2 of TH1?
NO
Replace TH1.
Replace PWB-A.
NO
Replace PWB-E or PWB-A.
2 – 40
Clean TH1
Replace PWB-E
or PWB-A.