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Problem
(27)
Cooling fan motor 3
does not operate.
(28)
Cooling fan motor 4
does not operate.
(29)
The scanner fan
motor does not oper-
ate.
(30)
The lamp fan motor
does not operate.
(31)
The LSU fan motor
does not operate.
(32)
Developing fan motor
1 or 2 does not oper-
ate.
1-5-62
Causes
Broken cooling fan motor 3
coil.
Poor contact in cooling fan
motor 3 connector termi-
nals.
Defective cooling fan motor
3.
Defective engine PWB.
Broken cooling fan motor 4
coil.
Poor contact in cooling fan
motor 4 connector termi-
nals.
Defective cooling fan motor
4.
Defective engine PWB.
Broken scanner fan motor
coil.
Poor contact in scanner fan
motor connector terminals.
Broken lamp fan motor coil.
Poor contact in lamp fan
motor connector terminals.
Defective lamp fan motor.
Defective scanner PWB.
Broken LSU fan motor coil.
Poor contact in LSU fan
motor connector terminals.
Defective LSU fan motor.
Defective engine PWB.
Broken developing fan
motor 1 or 2 coil.
Poor contact in developing
fan motor 1 or 2 connector
terminals.
Defective developing fan
motor 1.
Check procedures/corrective measures
Check for continuity across the coil. If none, replace cooling fan
motor 3.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Run maintenance item U037 and check if cooling fan motor 3
operates when YC5-31 on the engine PWB goes low. If not,
replace cooling fan motor 3.
Run maintenance item U037 and check if YC5-31 on the engine
PWB goes low. If not, replace the engine PWB.
Check for continuity across the coil. If none, replace cooling fan
motor 4.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Run maintenance item U037 and check if cooling fan motor 4
operates when YC13-5 on the engine PWB goes low. If not,
replace cooling fan motor 4.
Run maintenance item U037 and check if YC13-5 on the engine
PWB goes low. If not, replace the engine PWB.
Check for continuity across the coil. If none, replace the scanner
fan motor.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Check for continuity across the coil. If none, replace the lamp fan
motor.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Run maintenance item U037 and check if the lamp fan motor
operates when YC2-1 on the scanner PWB goes low. If not,
replace the lamp fan motor.
Run maintenance item U037 and check if YC2-1 on the scanner
PWB goes low. If not, replace the scanner PWB.
Check for continuity across the coil. If none, replace the LSU fan
motor.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Run maintenance item U037 and check if the LSU fan motor oper-
ates when YC5-32 on the engine PWB goes low. If not, replace
the LSU fan motor.
Run maintenance item U037 and check if YC5-32 on the engine
PWB goes low. If not, replace the engine PWB.
Check for continuity across the coil. If none, replace developing
fan motor 1 or 2.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Run maintenance item U037 and check if developing fan motor 1
operates when YC2-9 on the fan motors drive PWB goes low. If
not, replace developing fan motor 1.
Service Manual
Y104350-7
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