YC26（Engine PCB）
C6720 occurs
due to poor
connection
Identify the measured fuser unit (PI poor contact )
Method 1: Change “2” for part of serial no.
Method2：Even above number is 1, if the connector color
of PI is white on fuser unit, it has been modified.
White: Modified,
black: Not modified
KX8021X02529
Method1
Method2
Item code of harness
6550ci/7550ci :302LF46590
6500i/8000i :302K946590
Check firmware Ver (engine)
6550ci/7550ci : 2K9_1000.004.006
6500i/8000i : 2LF_1000.003.006
Whether it is after above version.
For C6600, IH PCB is not
necessary checked.
Check as referring to the
contents at left.
OK
OK
Check YC4 of IH PCB
NG
OK
OK
Replace the IH PCB
NG
OK
OK
NG
Replace the engine PCB
OK
OK
NG
Replace the harness between the
engine PCB and fuser unit.
OK
OK
C6600/C6720
Check firmware Ver.
OK
NG
NG
Check YC26 of Engine PCB
OK NG
Check the fuser unit (left lower fig.) Re-connect
Replace the fuser unit
NG OK
OK
OK
NG
Firmware Version Up
OK
NG
OK
C. Perform below checking.
C6600（Fuser Belt Rotation Error）/C6720（Fuser IH Belt
Rotation Error）/Fuser Belt Failure
For 6500i/8000i
90
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