Repair; Major Replacement Parts; Adjustment / Settings; User Mode - Canon PIXMA MX870 Service Manual

MX870

3. REPAIR

3-1. Major Replacement Parts (and Notes on Disassembling / Reassembling)
Est.
Service time Recommended removal procedure
part required
(min.)
Logic 15 (1) Cassette unit
board (2) Left and right side covers
ass'y (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).
Absorber 15 (1) Cassette unit
kit (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
Printer unit removal & Ink absorber
replacement,
Carriage 20 (1) Cassette unit
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 back).
- See
Carriage unit
Switch 30 (1) Cassette unit
system (2) Left and right side covers
unit (3) Document pressure plate unit
Notes on replacement
3-2. Part Replacement Procedures, (3)
for details.
3-2. Part Replacement Procedures, (7)
removal, for details.
*1
/

Adjustment / settings

*2
After replacement:
1. Initialize the EEPROM.
2. Set the ink absorber counter value.
3. Set the destination in the EEPROM.
4. Correct the automatic print head
alignment sensor.
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
8. Perform print head alignment in the

user mode.

9. Set the language displayed on the LCD
in the user mode.
After replacement:
1. Reset the ink absorber counter.
[See 4-2. Service
At replacement:
1. Apply grease to the sliding portions of
the carriage rail.
[See 4-4. Grease
details.]
2. Check the ink system function.
[See 4-2. Service
3. Perform print head alignment in the
user mode.
At replacement:
1. Adjust the paper feed motor.
[See 4-5. Special Notes on Servicing,
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TABLE OF CONTENTS
Operation
- EEPROM
information
print
- Service test
print
- Printing via
USB
connection
- Copying
- Direct
printing
from a
Mode, for details.] digital
camera
(PictBridge)
- Ink absorber
counter value
Mode, for details.] print (After
the ink
absorber
counter is
reset, the
counter value
is printed
automatically
- Service test
print
(Confirm ink
Application, for system
function.)
Mode, for details.]
- EEPROM
information
print
check