Canon PIXMA MP640, Service Manual, Page: 19 / 57

3. REPAIR
3-1. Major Replacement Parts
MP640 / MP648 TABLE OF CONTENTS
Service
part
Recommended removal
procedure
*1
/ Notes on
replacement
*2
Adjustment / settings Operation check
Logic board
ass'y (1) Cassette unit
(2) Left and right side covers
(3) Document pressure plate unit
(4) Scanner unit
(5) Main case
(6) Rear cover
(7) Logic board ass'y
- Before removal of the logic board ass'y,
remove the power cord, and allow for
approx. 1 minute (for discharge of
capacitor's accumulated charges), to
prevent damages to the logic board
ass'y.
- Before replacement, check the ink
absorber counter value (by service test
print or EEPROM information print).
After replacement:
1. Initialize the EEPROM.
2. Set the ink absorber counter
value.
3. Set the destination in the
EEPROM.
4. Correct the CD / DVD and
automatic print head alignment
sensors.
5. Check the ink system function.
6. Perform LF / Eject correction
(only when streaks or uneven
printing occurs).
7. Perform button and LCD test.
Perform 1 to 7 in the service
mode.
[See
4-2. Service Mode , for
details.]
8. Perform print head alignment
in the user mode.
9. Set the language displayed on
the LCD in the user mode.
- EEPROM information print
- Service test print
- Printing via USB connection
- Copying
- Direct printing from a digital
camera (PictBridge)
Absorber kit (1) Cassette unit
(2) Left and right side covers
(3) Document pressure plate unit
(4) Scanner unit
(5) Main case
(6) Rear cover
(7) Print unit
(8) Ink absorber
- See
3-2. Part Replacement Procedures,
(11) Ink absorber replacement, for
details.
After replacement:
1. Reset the ink absorber counter.
[See 4-2. Service Mode , for
details.]
- Ink absorber counter value
print (After the ink absorber
counter is reset, the counter
value is printed
automatically.)
Carriage unit (1) Cassette unit
(2) Left and right side covers
(3) Document pressure plate unit
(4) Scanner unit
(5) Main case
(6) Rear cover
(7) Timing slit strap
(8) Carriage rail
(9) Carriage unit
- Before removal of the carriage rail, put a
mark of the carriage rail position.
- Keep the timing slit strap (carriage
encoder film) free from stain or damage.
When returning the strap, make sure of
its orientation (left and right, front and
At replacement:
1. Apply grease to the sliding
portions of the carriage rail.
[See
4-3. Grease Application ,
for details.]
2. Check the ink system
function.
[See
4-2. Service Mode , for
details.]
3. Perform print head alignment
in the user mode.
- Service test print (Confirm
CD / DVD sensor correction
value, automatic print head
alignment sensor value, and
ink system function.)
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