44015503TH Rev. 1
26 /
Oki Data CONFIDENTIAL
2. DESCRIPTION OF OPERATION
Error checking methods and remedial methods
The color registration correction test function among the other self-diagnostic functions is
employed to check errors. (Section 5.3.2.6)
Remedial methods against different errors
• CALIBRATION (L or R), DyNAMICRANGE (L or R)
Check 1: If the above indication appears, check the connected state of the sensor
cable (FFC).
If the connected state is found abnormal, restore it to the normal state.
Check 2: Check to see whether the sensor surface is stained with toner, paper dust
or any other foreign matter.
If it is found stained, wipe it clean.
Check 3: Check to see whether the sensor shutter opens and closes normally, by
the MOTOR & CLUTCH TEST of the self-diagnostic function. If the shutter
operates imperfectly, replace the shutter unit.
If no problem was found by the checks 1 through 3, there is a problem
with the circuit.
Replace each of the color registration sensor PCBs (PRC PCB), the relay board (P6y
PCB), the PU board (PU PCB) and the cable one by one and check that no error will
occur again.
• BELT REFLX ERR
Check 4: If this indication appears, check the cleaned state of the toner remaining
on the belt surface, in addition to making the above checks 1, 2 and 3.
Take out the belt unit, turn the drive gear located on the left rear side, and
ensure that the belt surface has been cleaned thoroughly.
If cleaning is not achieved perfectly and there still remains toner on the
belt surface after the drive gear has been turned, replace the belt unit.
• (y or M or C) LEFT, (y or M or C) RIGHT, (y or M or C) HORIZONTAL
Check 5: If the above indication appears, check to see whether the toner is running
short, based on an NG-issuing color.
Replace the toner cartridge, as needed.