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Field Service Ver. 2.0 Jul. 2009
19. TROUBLE CODE
809
TROUBLESHOOTING
19.5.119 C3721: Fusing abnormally high temperature detection
(Center of the heating roller)
19.5.120 C3722: Fusing abnormally high temperature detection
(Edge of the heating roller)
19.5.121 C3725: Fusing abnormally high temperature detection (NC sensor)
19.5.122 C3724: Fusing abnormally high temperature detection (soaking side)
Relevant parts
Fusing unit
IH power supply (IHPU)
Relay drive board (REDB)
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, IHPU, MFPB and
REDB for proper connection and correct or
change as necessary.
—
—
4
Change fusing unit
—
—
5
Change IHPU
—
—
6
Change PRCB
—
—
7
Change REDB
—
—
Relevant parts
Fusing unit
IH power supply (IHPU)
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, IHPU, MFPB and
DCPU for proper connection and correct or
change as necessary.
—
—
4
Change fusing unit
—
—
5
Change IHPU
—
—
6
Change PRCB
—
—
7
Change DCPU
—
—
Y110571-1 Service Manual
Summary of Contents for d-color MF651
Page 1: ...d Color MF651 d Color MF551 d Color MF451 Color Printer SERVICE MANUAL Code Y110571 1...
Page 24: ...MEASURES TO TAKE IN CASE OF AN ACCIDENT S 22 Blank Page...
Page 27: ...d Color MF651 d Color MF551 d Color MF451 Color Printer SERVICE MANUAL Code Y110571 1...
Page 1053: ...UPDATING STATUS DATE UPDATED PAGES PAGES CODE 10 2009 1ST EDITION 1053053 Y110571 1...