Table of Contents
Advertisement
SHARP SERVICE MANUAL JX8200SM [11] TROUBLESHOOTING
Display 4
During printing
During diagnostics
Section
Fusing unit
PCU PWB
Power supply unit
Content
Fusing unit overheat trouble
Occurrence conditions
Fusing high temperature trouble
Details, causes
(The thermistor signal (RTH) rises above 4.1V. (The heat roller temperature exceeds 200˚C.))
(The heater lamp control signal is kept active.)
Heater lamp drive circuit trouble (Power supply PWB)
PCU PWB thermistor signal (RTH) input circuit trouble
Heater lamp drive circuit trouble (PCU PWB)
Heater lamp drive circuit trouble (Power supply unit)
Thermistor trouble (dirt)
Remedies
Clean or replace the thermistor.
Repair the power supply unit heater lamp drive circuit.
Repair the PCU PWB thermistor input circuit.
Repair the PCU PWB heater lamp control circuit.
Replace the power supply unit.
Replace the PCU PWB.
Display 5
During printing
During diagnostics
Section
Fusing unit
PCU PWB
Power supply unit
Content
Fusing unit low temperature trouble
Occurrence conditions
Fusing low temperature trouble
Details, causes
(The heat roller temperature does not reach the specified temperature within 60sec from turning on the power or
after canceling the sleep mode.)
(The thermistor signal (RTH) voltage does not rise.)
(The heater lamp control signal is kept inactive.)
Heater lamp drive circuit trouble (Power supply PWB)
PCU PWB thermistor signal (RTH) input circuit trouble
Heater lamp drive circuit trouble (PCU PWB)
Heater lamp drive circuit trouble (Power supply unit)
Thermistor trouble (dirt)
Remedies
Clean or replace the thermistor.
Repair the power supply unit heater lamp drive circuit.
Repair the PCU PWB thermistor input circuit.
Repair the PCU PWB heater lamp control circuit.
Replace the power supply unit.
Replace the PCU PWB.
Display 6
During printing
During diagnostics
Section
Fusing unit
PCU PWB
Content
Fusing unit thermistor trouble (open)
Occurrence conditions
Fusing thermistor trouble
Details, causes
(The thermistor signal (RTH) is kept at 0V.)
PCU PWB thermistor signal (RTH) input circuit trouble
Remedies
Replace the thermistor.
Repair or replace the PCU PWB thermistor input circuit.
LED
All LEDs are blink
MESSAGE
SERVICE (C4)
MESSAGE
HEATER HIGH
LED
All LEDs are blink
MESSAGE
SERVICE (C5)
MESSAGE
HEATER LOW
LED
All LEDs are blink
MESSAGE
SERVICE (C6)
MESSAGE
THERMISTER OPEN
11 – 4
Advertisement
Table of Contents
