17. Malfunction code
Field Service Ver. 1.0 Jun. 2008
308
T
roubleshooting
17.5.35
C3421: Fusing heaters trouble (heating side)
17.5.36
C3423: Fusing heaters trouble (pressurizing side)
17.5.37
C3721: Fusing abnormally high temperature detection (heating side)
17.5.38
C3723: Fusing abnormally high temperature detection (pressurizing side)
Relevant parts
Fusing unit
DC power supply (DCPU)
Printer control board (PRCB)
Step
Action
WIRING DIAGRAM
Control signal
Location (Electri-
cal component)
1
Check the fusing unit for correct installation
(whether it is secured in position).
—
—
2
Check the open/close operation of the
upper right door.
—
—
3
Check the fusing unit, PRCB and DCPU for
proper connection and correct or change
as necessary.
—
—
4
Change fusing unit
—
—
5
Change PRCB
—
—
6
Change DCPU
—
—
Relevant parts
Fusing unit
DC power supply (DCPU)
Printer control board (PRCB)
Step
Action
WIRING DIAGRAM
Control signal
Location (Electri-
cal component)
1
Check the fusing unit for correct installation
(whether it is secured in position).
—
—
2
Check the open/close operation of the
upper right door.
—
—
3
Check the fusing unit, PRCB and DCPU for
proper connection and correct or change
as necessary.
—
—
4
Change fusing unit
—
—
5
Change PRCB
—
—
6
Change DCPU
—
—
d-Color MF201
Service Manual Y109660-1