NOTE:
Go into service mode = copier / option / body / FN-ENTMP set it to -4.
Error detection of fixing end cooling system
Shutter Fan Position Drive Control
The duct that passes air has a shutter mechanism to enable sending air to the ideal area of the fixing film by
opening/closing the shutter by 6 steps (from full-close to full-open) according to the paper size.
The
shutter opening/closing position that corresponds the paper size has 7-point (A4R, LTRR, B4, EXE, K8, LTR, home
position).
Open/close positions of the shutter is detected by the fan shutter HP sensor (PS28) and fan shutter position
sensor (PS29). When sub-thermistor 1 (TH2) detects temperature listed below, fan shutter motor (M15) is
rotated until the fan shutter HP sensor detects the shutter. And then, positive rotation of the fan shutter motor
(M15) is initiated and the shutter is moved to a position corresponds to the paper size chosen. The fan shutter
motor is reversely rotated in the last-rotation period, and the shutter is returned to the home position. If paper
size is changed during continuous printing, the shutter is returned to its home position first and then the shutter
is moved to a position corresponds to the paper size chosen.
a. Fault of end cooling fan
(1) Timing of detection
Implement detection at each time of end cooling fan ON.
(2) Error determination
Error determination is made when the lock signal of the fan has not been ON for one continuous second.
(3) Operation after detection
Display the following message on control panel.
"Check fixing unit cooling mechanism. Call service rep".
At this time, this control is not done, and the down sequence is controlled though the print operation can be continued (control that lengthens between paper and drops the print speed).
b. Unclear position of fan shutter opening/closing
(1) Timing of detection
- At the time of operation of fixing end cooling (using small-sized papers and during raising temperature of
fixing end)
- At the time of changing paper size (small size to/from large size)
- At the time of completing printing
(2) Error determination
If 2000msec or more of the input value of fan shutter detection sensor cannot be detected at the time of moving
fan shutter to the determined position, error is determined.
(3) Operation after detection
"Check fixing unit cooling mechanism. Call service rep".
At this time, this control is not done, and the down sequence is controlled though the print operation can be
continued (control that lengthens between paper and drops the print speed).
c. Unclear fan shutter HP
(1) Timing of detection
- At the time of power ON
- At the time of operation of fixing end cooling (using small-sized papers and during raising temperature of
fixing end)
- At the time of changing paper size (small size to/from large size)
- At the time of completing printing
(2) Error determination
If 2000msec or more of the input value of fan shutter HP sensor cannot be detected at the time of moving fan
shutter to the determined position, error is determined.
(3) Operation after detection
Stop printing, display the following error message on control panel.
Error code:
E840-0000: Edge Cooling Fan (front and rear) Error
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