Phenomena
Cause
positions
Cause 1
Cause 2
Remedy
Offset
Charger roller
section
Charger roller kept in contact with transfer drum
Lift clutch defect
Lift mechanism section (cam, gear, spring) defect
Paper feed unit installing position defect
Charger roller cleaning
Lift clutch adjustment, replacement
Lift mechanism section parts replacement (cam, gear,
spring)
Paper feed unit installing position adjustment
Fusing unit
Oil leak
Oil excess
Cleaning failure
Fusing temperature improper
Oil blade defect (blade, tension spring)
Oil tank packing defect
Oil roller defect
Cleaning roller defect
Oil tank defect
Thermistor defect
Fusing unit replacement
Fusing unit cleaning
Sensor
Thermistor malfunction
Thermistor
defect
Fusing unit replacement
PCU PWB
Sensor
malfunction
Load control failure
Thermistor input circuit defect
Lift clutch control circuit defect
PCU PWB repair, replacement
White spot
Developing
unit
Undertoner
Development insufficient (Insufficient toner on the
developing roller)
Developer drop
Doctor gap improper (too large)
Developing roller main electrode position improper
Developer defect
Developing shutter defect
Developing shutter spring defect
Developing unit replacement
Developing shutter spring repair
OPC
drum
unit
OPC drum charging failure (unevenness)
OPC
drum
defect
(sectional
fatigue)
OPC drum defect (dirt, foreign material)
OPC drum unit replacement
OPC drum cleaning
Drive
section
Shutter ring failure
Developing roller clutch defect
Developing shutter clutch solenoid position improper
Developing shutter clutch defect
Developing shutter drive gear defect
Developing roller clutch defect
Developing roller clutch replacement
Developing shutter clutch solenoid position adjustment
Developing shutter clutch replacement
Developing shutter drive gear replacement
Developing roller clutch replacement
High voltage
PWB
Main charger output failure (abnormally low)
Developing bias output failure (abnormally high)
(Great difference between developing bias and OPC
drum potential)
Developer drop
High voltage PWB defect
High
voltage
PWB
replacement
Sensor
Temperature/humidity sensor malfunction
Toner concentration sensor malfunction
Temperature/humidity sensor defect
Toner concentration sensor (developing unit) defect
Temperature/humidity sensor replacement
Developing unit replacement
PCU PWB
Print quality control data (NV-RAM) defect
Sensor malfunction
Load control defect
NV-RAM data disturbance, defect, peripheral circuit
defect
Temperature/humidity sensor input circuit defect
Toner concentration sensor input circuit defect
Developing shutter clutch control circuit defect
Developing roller clutch control circuit defect
Toner clutch (color) control circuit defect
Toner motor (black) control circuit defect
Transfer bias control circuit defect
Developing bias control circuit defect
Discharger control circuit defect
Main charger control circuit defect
Print quality control data (NV-RAM) correction by diag
PCU PWB repair, replacement
11 – 27
SHARP SERVICE MANUAL JX8200SM [11] TROUBLESHOOTING
Содержание JX-8200
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