Canon PIXMA MP640, Service Manual, Page: 21 / 57

Carriage rail
and main
chassis See 3-2. Part Replacement Procedures ,
and Parts Catalog.
At replacement:
1. Apply grease to the sliding
portions.
[See
4-3. Grease Application ,
for details.]
- Service test print
Idler pulley
parallel pin
APP code
wheel gear
shaft
Document
pressure
sheet (1) Cassette unit
(2) Left and right side covers
(3) Document pressure plate unit
(4) Scanner unit At replacement:
1. Confirm the document
pressure plate sheet position.
[See
4-4. Special Notes on
Servicing, (4) Document
pressure sheet replacement
, for
details.]
- Service test print
Document
bottom
cover
Scanner unit
Panel board
ass'y (1) Right side cover
(2) Document pressure plate unit
(3) Panel board
(4) LCD viewer
- Be cautious not to scratch or damage the
LCD cable.
At replacement:
1. Perform button and LCD test.
[See 4-2. Service Mode , for
details.]
- Service test print
LCD viewer
unit
Timing slit
strip film See 3-2. Part Replacement Procedures ,
and Parts Catalog.
- Upon contact with the film, wipe the
film with ethanol.
- Confirm no grease is on the film. (Wipe
off any grease thoroughly with
ethanol.)
- Do not bend the film.
After replacement:
1. Perform print head alignment
in the user mode.
2. Perform LF / Eject correction
in the service mode (only
when uneven printing or
streaks appear on printouts
after replacement).
[See
4-2. Service Mode , for
details.]
- EEPROM information print
- Service test print
Timing slit
disk feed
film
Timing slit
disk eject
film
Print head After replacement:
1. Perform print head alignment
in the user mode.
- Service test print
Wireless
LAN board
ass'y (1) Cassette unit
(2) Left and right side covers
(3) Document pressure plate unit
(4) Scanner unit
(5) Main case
(6) WLAN board
After replacement:
1. Reset the LAN settings in the
user mode.
2. Print the EEPROM
information in the service
mode to confirm that the
WLAN MAC address is
properly updated.
- EEPROM information print
- Service test print
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