Sharp MX-2314N Service Manual page 270

F2-22 Discharge lamp trouble (K)
Trouble content The lamp is kept open for 1 sec from turning on the
discharge lamp.
Detail PCU
Cause Contact trouble between the discharge lamp PWB (K)
and the PCU PWB.
Discharge lamp PWB (K) trouble.
PCU PWB trouble.
Check & Remedy Replace the discharge lamp PWB (K).
Check the harness and the connector.
Replace the PCU PWB.
F2-23 Discharge lamp trouble (C)
Trouble content The lamp is kept open for 1 sec from turning on the
discharge lamp.
Detail PCU
Cause Contact trouble between the discharge lamp PWB (C)
and the PCU PWB.
Discharge lamp PWB (C) trouble.
PCU PWB trouble.
Check & Remedy Replace the discharge lamp PWB (C).
Check the harness and the connector.
Replace the PCU PWB.
F2-24 Discharge lamp trouble (M)
Trouble content The lamp is kept open for 1 sec from turning on the
discharge lamp.
Detail PCU
Cause Contact trouble between the discharge lamp PWB
(M) and the PCU PWB.
Discharge lamp PWB (M) trouble.
PCU PWB trouble.
Check & Remedy Replace the discharge lamp PWB (M).
Check the harness and the connector.
Replace the PCU PWB.
F2-25 Discharge lamp trouble (Y)
Trouble content The lamp is kept open for 1 sec from turning on the
discharge lamp.
Detail PCU
Cause Contact trouble between the discharge lamp PWB (Y)
and the PCU PWB.
Discharge lamp PWB (Y) trouble.
PCU PWB trouble.
Check & Remedy Replace the discharge lamp PWB (Y).
Check the harness and the connector.
Replace the PCU PWB.
F2-39 Process thermistor trouble
Trouble content
Detail PCU
Cause Process thermistor trouble.
Process thermistor harness connection trouble.
PCU PWB trouble.
Check & Remedy Replace the process thermistor.
Check connection of the process thermistor harness
and the connector.
Replace the PCU PWB.
F2-40
Trouble content
Check & Remedy
F2-41
Trouble content
Check & Remedy
F2-42
Trouble content
Check & Remedy
F2-43
Trouble content
Check & Remedy
MX3114N TROUBLESHOOTING 7 – 15
Toner density sensor trouble (K)
Detail PCU
Cause Toner density sensor output abnormality.
Sensor connector and harness connection trouble.
Developing unit trouble.
PCU PWB trouble.
Replace the toner density sensor.
Check connection of the sensor connector and the
harness.
Replace the developing unit.
Replace the PCU PWB.
Toner density sensor trouble (C)
Detail PCU
Cause Toner density sensor output abnormality.
Sensor connector and harness connection trouble.
Developing unit trouble.
PCU PWB trouble.
Replace the toner density sensor.
Check connection of the sensor connector and the
harness.
Replace the developing unit.
Replace the PCU PWB.
Toner density sensor trouble (M)
Detail PCU
Cause Toner density sensor output abnormality.
Sensor connector and harness connection trouble.
Developing unit trouble.
PCU PWB trouble.
Replace the toner density sensor.
Check connection of the sensor connector and the
harness.
Replace the developing unit.
Replace the PCU PWB.
Toner density sensor trouble (Y)
Detail PCU
Cause Toner density sensor output abnormality.
Sensor connector and harness connection trouble.
Developing unit trouble.
PCU PWB trouble.
Replace the toner density sensor.
Check connection of the sensor connector and the
harness.
Replace the developing unit.
Replace the PCU PWB.