Phenomena
Cause
positions
Cause 1
Cause 2
Remedy
Density
unevenness
PCU PWB
Print quality control data (NV-RAM) defect
Sensor malfunction
Load control failure
NV-RAM data disturbance, defect, peripheral 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
Developing motor control circuit defect
Transfer bias control circuit defect
Developing bias control circuit defect
Print quality control data (NV-RAM) correction diag
PCU PWB repair, replacement
Breakdown
(color missing)
Charger roller
section
Moisture absorption of paper (The charger roller does
not properly make contact with the transfer drum.)
Lift clutch defect
Lift mechanism section (cam, gear, spring) defect
Charger roller earth defect
Charger roller cleaning
Lift clutch adjustment/replacement
Lift mechanism section parts replacement (cam, gear,
spring)
Earth check
Transfer drum
section
Uneven
transfer
Transfer drum defect (dirt, deformation)
Dew
Transfer voltage failure
Transfer drum replacement
High voltage
PWB
Transfer bias voltage output failure (abnormally high)
Discharge voltage output failure (abnormally high)
High voltage PWB defect
Transfer bias electrode section improper contact
Discharge high voltage PWB defect
High voltage PWB replacement
Discharge bias electrode replacement
Discharge high voltage PWB replacement
Discharger
Transfer discharge voltage failure (abnormally high)
Discharger
defect
Discharger dirt
Discharger rail defect
Discharger cleaning
Discharger replacement
Discharger rail replacement
Paper
Paper
defect
Moisture absorption, too thick
Paper replacement
Sensor
Temperature/humidity sensor malfunction
Toner concentration sensor malfunction
OHP sheet sensor malfunction
Temperature/humidity sensor defect
Toner concentration sensor (developing unit) defect
OHP sensor defect
Temperature/humidity sensor replacement
Developing unit replacement
OHP sheet sensor replacement
PCU PWB
Print quality control data (NV-RAM) failure
Sensor malfunction
Load control failure
NV-RAM data disturbance, defect, peripheral circuit
defect
Temperature/humidity sensor input circuit defect
Lift clutch control circuit defect
Transfer bias control circuit defect
Discharger control circuit defect
Print quality control data (NV-RAM) correction by diag
PCU PWB repair, replacement
11 – 31
SHARP SERVICE MANUAL JX8200SM [11] TROUBLESHOOTING
Содержание JX-8200
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