Canon MF4500 Series, Service Manual

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Technical Overview > Fixing System > Service Works > Notes on service works
Technical Overview > Fixing System > Service Works > Notes on service works
● Other Functions
■
Throughput Down Control
This machine performs the throughput down control that extends the paper interval and lower
the printing speed to prevent the edge of the fixing heater from overheating at continuous
printing of small paper (the paper with narrow width) and to prevent the fixing heater unit from
overheating at high-volume continuous printing.
An extended paper interval lowers the fixing heater temperature between the papers,
preventing the edge of the roller of fixing assembly and the delivery unit from overheating.
This control has the following 6 modes and the operation sequence differs depending on each
modes.
Paper Size
Paper Type Large-sized Small-sized or Narrow Long and Narrow 16K
Length: 271
mm or more
Width: 190
mm or more
Length: less than 271 mm
(Width: less than 190 mm)
Length: less
than 313 mm
Width: less
than 190 mm
Length: 313
mm or more
Width: less
than 190 mm
Length:
270 +/- 15
mm
Plain Paper 25 (Full
speed)
-> 12 (Half
speed) * 1
(2)
3 ppm
(half speed)
1 ppm
(half speed) * 2
(5)
Plain Paper L 25 (Full
speed)
-> 12 (Half
speed) *
1
(2)
3 ppm
(half speed)
1 ppm
(half speed) *
2
(5)
Heavy Paper
- (1)
3 ppm
(half speed)
1 ppm
(half speed) *
2
(6)
Rough Paper 1
- (1)
3 ppm
(half speed)
1 ppm
(half speed) *
2
(6)
Rough Paper 2
-
(1)
3 ppm
(half speed)
1 ppm
(half speed) *
2
(6)
(3)
(In the case of user
definition)
Label Paper - - - - -
Transparency - - - - -
Postcard (4) (4) - - -
Envelope - (1) - - -
*1 : When the number of fed paper reaches 270 after starting from Cold state, the speed
changes from full speed to half speed, and the throughput changes from 25ppm to 12ppm.
The number of fed paper at which the throughput changes from full speed to half speed
may vary according to temperature control of the Fixing Assembly.
T-2-8
*2 : Measures against wrinkle and curl.
Number of Fed Sheets
(1) (2) (3) (4)
Half speed Half speed Half speed Half speed
1 to 2 11 ppm 12 ppm 6 ppm 7 ppm
3 to 5 9 ppm 12 ppm 4 ppm 5 ppm
6 to 10 8 ppm 11 ppm 4 ppm 4 ppm
11 to 15 6 ppm 11 ppm 3 ppm 4 ppm
16 to 20 6 ppm 8 ppm 3 ppm 4 ppm
21 to 30 6 ppm 8 ppm 3 ppm 4 ppm
31 to 40 4 ppm 7 ppm 3 ppm 4 ppm
41 to 75 4 ppm 6 ppm 3 ppm 4 ppm
From 76 4 ppm 6 ppm 3 ppm 4 ppm
Number of Fed Sheets
(5) (6)
Full speed Half speed
1 to 55 20 ppm 10 ppm
56 to 110 16 ppm 8 ppm
111 to 120 13 ppm 7 ppm
121 to 150 11 ppm 6 ppm
151 to 250 10 ppm 5 ppm
From 251 8 ppm 4 ppm
Service Works
■ At parts replacement
No work is required for this product at parts replacement.
■
Maintenance
No periodically replaced parts, durable parts or periodical service is set for this product.
■ Notes on service works
None.
T-2-9
T-2-10