Lexmark 11C0200 Service Manual - Page 68

Lexmark 11C0200 - Optra SC 1275 Color Laser Printer Manual

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Service Checks Fuser Service Check FRU 1 • Heater Lamp (H1) • Thermostat (S4) • Power Unit (PU1) • Mechanical Controller Board (PWB-A) Action Be sure the heater lamp (H1) lights up when the power is turned on. (Open the rear door and activate the rear door interlock to see the fuser lamp.) If the lamp does not light up, check for voltage between CN2PU-1 and CN2PU-3 of the power unit (PU1). If there is voltage, replace the heater lamp (H1) or the thermostat (S4). If there is no voltage, replace the power unit (PU1) or the mechanical controller board (PWB-A). 2 • Fuser • Mechanical Controller Board (PWB-A) • Fuser • Mechanical Controller Board (PWB-A) Check for voltage between CN9A-6 and CN9A-7 of thermistor 1 (TH1). If there is no voltage, replace the fuser. If there is voltage, replace the mechanical controller board (PWB-A). Check for voltage between CN9A-8 and CN9A-9 of thermistor 2 (TH2). If there is no voltage, replace the fuser. If there is voltage, replace the mechanical controller board (PWB-A). 3 Diagnostic Information 2-33

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Diagnostic Information 2-33
Service Checks
Fuser Service Check
FRU
Action
1
•
Heater
Lamp (H1)
•
Thermostat
(S4)
•
Power Unit
(PU1)
•
Mechanical
Controller
Board
(PWB-A)
Be sure the heater lamp (H1) lights up when the
power is turned on. (Open the rear door and acti-
vate the rear door interlock to see the fuser lamp.) If
the lamp does not light up, check for voltage
between CN2PU-1 and CN2PU-3 of the power unit
(PU1).
If there is voltage, replace the heater lamp (H1) or
the thermostat (S4).
If there is no voltage, replace the power unit (PU1)
or the mechanical controller board (PWB-A).
2
•
Fuser
•
Mechanical
Controller
Board
(PWB-A)
Check for voltage between CN9A-6 and CN9A-7 of
thermistor 1 (TH1). If there is no voltage, replace
the fuser.
If there is voltage, replace the mechanical controller
board (PWB-A).
3
•
Fuser
•
Mechanical
Controller
Board
(PWB-A)
Check for voltage between CN9A-8 and CN9A-9 of
thermistor 2 (TH2). If there is no voltage, replace
the fuser.
If there is voltage, replace the mechanical controller
board (PWB-A).