Sharp MX-C300W Service Manual

MX-C250 TROUBLESHOOTING 7 – 8
F2-23 Discharge lamp trouble (CMY)
F2-39 Process thermister trouble
F2-40 Toner density sensor trouble (BLACK)
F2-41 Toner density sensor trouble (CYAN)
F2-42 Toner density sensor trouble
(MAGENTA)
F2-43 Toner density sensor trouble
(YELLOW)
F2-45 K image density sensor trouble
F2-47 Ozon duct thermister trouble
F2-49 LSU thermister trouble
Cause Contact trouble between the discharge lamp PWB
(C) and the PCU PWB.
Discharge lamp PWB (C) trouble.
MFPC PWB trouble.
Check & Remedy Replace the discharge lamp PWB (C).
Check the harness and the connector.
Replace the MFPC PWB.
Cause Process thermister trouble.
Process thermister harness connection trouble.
MFPC PWB trouble
Check & Remedy Replace the process thermister.
Check connection of the harness and the
connector.
Replace the MFPC PWB.
Cause Toner density sensor output abnormality (Sample
level 25 or less, or 231 or above)
Connection trouble of the connector and the
harness.
Developing unit trouble. MFPC PWB trouble
Check & Remedy Replace the toner density sensor.
Harness and connector connection trouble.
Replace the developing unit.
Replace the MFPC PWB.
Cause Toner density sensor output abnormality (Sample
level 25 or less, or 231 or above)
Connection trouble of the connector and the
harness.
Developing unit trouble.
MFPC PWB trouble
Check & Remedy Replace the toner density sensor.
Harness and connector connection trouble.
Replace the developing unit.
Replace the MFPC PWB.
Cause Toner density sensor output abnormality (Sample
level 25 or less, or 231 or above)
Connection trouble of the connector and the
harness.
Developing unit trouble.
MFPC PWB trouble
Check & Remedy Replace the toner density sensor.
Harness and connector connection trouble.
Replace the developing unit.
Replace the MFPC PWB.
Cause Toner density sensor output abnormality (Sample
level 25 or less, or 231 or above).
Connection trouble of the connector and the
harness.
Developing unit trouble.
MFPC PWB trouble.
Check & Remedy Replace the toner density sensor.
Harness and connector connection trouble.
Replace the developing unit.
Replace the MFPC PWB.
Cause K image density sensor sensitivity adjustment
trouble.
K image density sensor trouble.
Harness and connector connection trouble.
K image density sensor dirt.
Calibration plate dirt.
Calibration plate solenoid trouble.
MFPC PWB trouble.
Check & Remedy Replace the K image density sensor.
Check connection of the connectors and the
harness.
Clean the K image density sensor.
Replace the calibration plate.
Replace the calibration plate solenoid.
Replace the PCU PWB.
Use SIM44-2 to adjust the process control sensor
sensitivity.
Cause
The ozone duct thermister trouble.
Harness and connector connection trouble
between the ozone duct thermistor and the
MFPC PWB.
MFPC PWB trouble.
Check & Remedy
Check connection of the connectors and the
harness between the ozone duct thermistor
and the MFPC PWB.
Replace the MFPC PWB.
Cause The LSU detection temperature is outside of -28C
- 78C.
LSU thermister trouble.
Harness and connector connection trouble.
MFP PWB trouble
LSU control PWB trouble.
Check & Remedy Check connection of the connectors and the
harness.
Replace the MFPC PWB.
Replace the LSU.

Sharp MX-C300W Specifications

General

Print Technology	Laser
Print Speed (Black)	30 ppm
Print Speed (Color)	30 ppm
Print Resolution	600 x 600 dpi
Copy Speed (Black)	30 cpm
Copy Speed (Color)	30 cpm
Copy Resolution	600 x 600 dpi
Scan Resolution	600 x 600 dpi
Fax Transmission Speed	33.6 Kbps
Duplex Printing	Yes
Mobile Printing	Yes
Max Paper Size	8.5" x 14"
Connectivity	USB, Ethernet, Wireless
Display	4.3-inch color touchscreen
Weight	29 kg
Scan Type	Flatbed, ADF