44473001TH Rev.1
45 /
Oki Data CONFIDENTIAL
2. DESCRIPTION OF OPERATION
Error checking methods and remedies
The color registration correction test function among the other self-diagnostic functions is
employed to check errors. (Section 5.3.2.6)
Remedies for 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.
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.
I
f
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 shut-
ter operates imperfectly, replace the shutter unit.
I
f
no problem was found by the checks 1 through 3, there is a problem
with the circuit.
Re
place each of the color registration sensor board, the CU/PU board
and the connector 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 for 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.
I
f
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 toner of NG-issuing
color is running short.
R
e
place a toner cartridge, as needed.
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