Canon PIXMA MP750 User manual

PIXMA MP750/780
SERVICE
MANUAL
REVISION 0
PIXMA MP750 H12-4562 120V USA
PIXMA MP750 H12-4563 230V EMB
PIXMA MP750 H12-4564 230V GB
PIXMA MP750 H12-4565 230V EUM
PIXMA MP750 H12-4566 120V CND
PIXMA MP750 H12-4568 230V AUS
PIXMA MP780 H12-4582 120V USA
PIXMA MP780 H12-4583 230V EE/NE
PIXMA MP780 H12-4584 230V GB/ME/NORD/ZA
PIXMA MP780 H12-4585 230V AT/CH/DE
PIXMA MP780 H12-4586 230V WEST
PIXMA MP780 H12-4587 120V CND/LTN
PIXMA MP780 H12-4588 230V AUS
PIXMA MP780 H12-4589 230V AE
PIXMA MP780 H12-4597 230V CHN
HY8-13A3-000
COPYRIGHT2004 CANON INC. CANON PIXMA MP750/780 NOV. 2004

Scope
This manual has been issued by Canon Inc., to provide the service technicians of this product with the
information necessary for qualified persons to learn technical theory, installation, maintenance, and repair of
products. The manual covers information applicable in all regions where the product is sold. For this reason, it
may contain information that is not applicable to your region.
Revision
This manual could include technical inaccuracies or typographical errors due to improvements or changes made
to the product. When changes are made to the contents of the manual, Canon will release technical information
when necessary. When substantial changes are made to the contents of the manual, Canon will issue a revised
edition.
The following do not apply if they do not conform to the laws and regulations of the region where the manual or
product is used:
Trademarks
Product and brand names appearing in this manual are registered trademarks or trademarks of the respective
holders.
Copyright
All rights reserved. No parts of this manual may be reproduced in any form or by any means or translated into
another language without the written permission of Canon Inc., except in the case of internal business use.
Copyright © 2004 by Canon Inc.
CANON INC.
Inkjet MFP Quality Assurance Div.
5-1 Hakusan 7-Chome, Toride-city, Ibaraki 302-8501, Japan

I. MANUAL OUTLINE
This manual consists of the following three parts to provide information necessary to service the PIXMA
MP750/MP780:
Part 1: Maintenance
Information on maintenance and troubleshooting of the PIXMA MP750/MP780
Part 2: Technical Reference
New technology and technical information such as FAQ's (Frequently Asked Questions) of the PIXMA
MP750/MP780
Part 3: Appendix
Block diagrams and pin layouts of the PIXMA MP750/MP780
Reference:
This manual does not provide sufficient information for disassembly and reassembly procedures. Refer
to the graphics in the separate Parts Catalog.

II. TABLE OF CONTENTS
Part 1: MAINTENANCE
1 - 1 1. MAINTENANCE
1 - 1 1-1. Adjustment, Periodic Maintenance, Periodic Replacement Parts, and Replacement
Consumables by Service Engineer
1 - 3 1-2. Customer Maintenance
1 - 4 1-3. Product Life
1 - 4 1-4. Special Tools
1 - 5 1-5. Serial Number Location
1 - 6 2. LIST OF ERROR DISPLAY / INDICATION
1 - 6 2-1. Users Error Messege
1 - 9 2-2. Users Error Code
1 - 9 2-3. Service Call Errors
1 - 14 2-4. New Error Codes and Recovery Methods
1 - 16 2-5. Warnings
1 - 17 2-6. Troubleshooting by Symptom
1 - 22 2-7 Processing Communication Problems (MP780 only)
1 - 22 2-7-1 Initial Identification of Problems
1 - 24 2-7-2 Procedures for Processing Communication Problems
1 - 25 2-7-3 Procedures for Processing Communication Problems with Canon Facsimile.
1 - 26 2-7-4 Procedures for Processing Communication Problems with other Manufacturer's
Facsimiles.
1 - 27 3. REPAIR
1 - 27 3-1. Notes on Service Part Replacement (and Disassembling / Reassembling)
1 - 30 3-2. Special Notes on Repair Servicing
1 - 30 3-2-1 Flexible Cable and Harness Wiring, Connection
1 - 33 3-3. Adjustment / Settings
1 - 33 3-3-1 Paper Feed Motor Adjustment
1 - 33 3-3-2 Gear Phase Adjustment
1 - 35 3-3-3 Lift Cam Shaft Ass’y Adjustment
1 - 36 3-3-4 Solenoid Cam Spring Location
1 - 36 3-3-5 Carriage Shaft Clip Location
1 - 37 3-3-6 White Sheet Location
1 - 39 3-3-7 Grease Application
1 - 41 3-3-8 Waste Ink Counter Setting
1 - 41 3-4. User Data Flow
1 - 46 3-5. Service Switches
1 - 46 3-5-1 Hardware Switches
1 - 46 3-5-2 Service Data Setting
1 - 47 3-5-3 Service Data Registration / Setting Method
1 - 48 3-5-4 Service Data Flowchart
1 - 54 3-5-5 Explanation of service data
1 - 55 3-5-6 New SSSWs / parameters added to this model
1 - 60 3-5-7 SSSW Default Setting
1 - 78 3-6. Test Mode / Factory Mode
1 - 78 3-6-1 Test Mode / Factory Mode Overview

1 - 79 3-6-2 Test Mode Menu
1 - 80 3-6-3 Factory Mode
1 - 81 3-6-4 Operation Panel Test
1 - 83 3-6-5 Print Test
1 - 85 3-6-6 CD-R Calibration (230V only)
1 - 85 3-7. Upgrading the version of SPCNT Flash ROM
1 - 86 3-8. Verification Items
1 - 86 3-8-1 Users Report Service Test Print
1 - 87 3-8-2 Service EEPROM Information Print
1 - 88 3-8-3 System Data List (MP780 only)
1 - 95 3-8-4 System Dump List (MP780 only)
1 - 99 3-8-5 Service Activity Report (sending/receiving) (MP780only)
1 - 101 3-8-6 EEPROM Information Print
1 - 102 4. Cleaning Your Machine
1 - 102 4-1 Caution
1 - 102 4-2 Cleaning the Exterior
1 - 102 4-3 Cleaning the Scan Area
1 - 103 4-4 Cleaning the Interior
1 - 103 4-5 Cleaning the Feeder Cover
1 - 104 4-6 Cleaning the Rubber Sheet / Paper Feed Rollor / Separate Rollor
1 - 104 4-7 Cleaning the Paper Feed Rollor
1 - 105 4-8 Cleaning the Bottom Plate
1 - 106 5. Transportation
Part 2: TECHNICAL REFERENCE
2 - 1 1. New Technologies
2 - 3 2. Cleaning Mode and Amount of Ink Purged
2 - 5 3. Print Mode
2 - 9 4. FAQ (Problems Specific to the MP750/MP780 and Corrective Actions)
Part 3: APPENDIX
3 - 1 1. Wiring Diagram
3 - 2 2. Circuit Diagram
3 - 3 2-1 NCU Circuit Diagram1
3 - 4 2-2 NCU Circuit Diagram2
3 - 5 2-3 Relay Circuit Diagram
3 - 6 3. Specification

Part 1
Maintenance

1 - 1
1. MAINTENANCE
1-1 Adjustment, Periodic Maintenance, Periodic Replacement Parts, and
Replacement Consumables by Service Engineer
(1) Adjustment
Adjustment Timing Purpose Tool Approx
time
ALL CLEAR
(EEPROM
initialization)
*1
AtSPCNTBOARDASS’Y
replacement To initialize settings other than the following
-1-touch speed dialing
(MP780 only)
-Service/User soft SW
(MP780 only)
-Tx/Rx infomation
(MP780 only)
-Various counters
-TYPE Setting
None
To initialize
the settings,
select #8
CLEAR–ALL
in the service
mode
1 min
TYPE settings
(EEPROM
settings)
*1
-AtSPCNTBOARDASS’Y
replacement
-AtexcecutingAllclear
-To set the type
-To set the destination None Select #5
TYPE in the
service mode
Power SW
OFF/ON*1
1 min
Waste ink
counter resetting
(EEPROM
settings)
At bottom case unit
replacement
At ink absorber INK
ABSORBER
(HY7-2885/2886/2887/28
88/2889/2890/2891/2953)
To reset the waste ink
counter.
None
Select #7
PRINTER in
the service
mode, and
input “0” at #5
INK ABS
CAPA.
1min
Waste ink
counter setting
(EEPROM
initialization)
At SPCNTBOARDASS’Y
replacement Waste ink counter setting None Print out the
EEPROM
information,
and select #7
PRINTER in
the service
mode.
Then, register
at #5 INK ABS
CAPA.
1 imn
CD-R sensor /
automatic print
head alignment
sensor correction
(EEPROM
settings)
(230V only)
At SPCNTBOARDASS’Y
replacement
At carriage unit
replacement
To correct the CD-R and
automatic print head
alignment sensor.
None.
(Correction
performed
through
FACTORY
MODE-[2]PRI
NTER-SHUK
KEN at the
same time as
printing.)
1 min

1 - 2
Adjustment Timing Purpose Tool Approx
time
Print head
alignment
- At print head
replacement
- At SPCNTBOARDASS’Y
replacement
To ensure accurate dot
placement.
None.(Main
body
buttons)
Computer
(settings via
the printer
driver)
2 min
Paper feed motor
position
adjustment*
*2
-At paper feed motor unit
replacement
To adjust the belt tension.
(Position the paper
feed motor so that the belt
is stretched tight.)
None
For the
adjustment,
refer to [3-3
Adjustment/Se
ttings
(1) PAPER
FEED
MOTOR
Installation
Adjustment.
2 min
Grease
application
-At carriage unit
replacement
-At chassis' upper gear
replacement
-At LIFT CAM SHAFT
replacement
-To maintain sliding
properties of the carriage,
carriage shaft, and shaft
lift.
-To protect the chassis'
upper gear.
-To LIFT CAM SHAFT
replacement
-FLOIL
KG-107A
-MOLYKOTE
HP300
1 min
Note: DO NOT loosen the red screws on both sides of the main chassis, securing the carriage shaft
positioning.
*1: When SPCNT BOARD ASS’Y isreplaced, be sure to select the settings of [#8CLEAR]-[ALL]
and [#5TYPE] in Service Mode, and turn thepower OFF/ON with the Power button (Software
Power: OFF/ON). DO NOT turn the power OFF/ON by removing and inserting the power code
(Hardware Power: OFF/ON). In this case, data may not be written correctly.
*2: Red screws of paper feed motor
The red screws securing the paper feed motor may be loosened only at replacement of the paper
feed motor unit.
(2) Periodic maintenance
Adjustment Timing Purpose Tool Approx.
time
None

1 - 3
(3) Periodic replacement parts
Adjustment Timing Purpose Tool Approx.
time
None
(4) Replacement consumables
Adjustment Timing Purpose Tool Approx.
time
None
1-2 Customer Maintenance
Adjustment Timing Purpose Tool
Approx.
time
Print head
alignment At print head replacement. To ensure accurate dot placement. None Main body
buttons
Computer
(automatic
settings
via the printer
driver)
3min
Print head cleaning
When print quality is not satisfying.
To improve nozzle
conditions.
None
Main body
buttons
Computer
(settings via the
printer driver)
1 min
Print head deep
cleaning
When print quality is
not satisfying, and not
improved by print head
cleaning.
To improve nozzle
conditions.
None
Computer
(setting via the
printer driver)
.
2min
Ink tank
replacement
When an ink tank
becomes empty.(No ink
error) - -
2min
Paper feed roller
cleaning
When paper does not
feed properly.
To clean the paper feed
rollers.
None
Main body
buttons
2min
CD-R print position
adjustment
(230V only)
At CD-R printing, when
necessary
To correct CD-R print
position.
None
Computer
(application
software)
2min
Bottom plate
cleaning
When the back side of
the paper is smeared
To clean the platen ribs.
None Computer
(application
software)
1min

1 - 4
1-3 Product Life
(1) Main body
Specified print volume (a), (b), or the years of use (c), whichever comes first.
(a) Scanning Section: 15,000 pages
(b) Printing Section: 18,000 pages
Copy Print FAX
1,500 character pattern + Post card
Address printing
3,240 pages
(MP780)
3,420 pages
(MP750)
3,780 pages
(MP780)
3,960 pages
(MP750)
-
Bk
1,500 character pattern - - 360 pages
(MP780)
A4, 7.5% duty per color pattern 2,520 pages 2,880 pages -
A4, photo, borderless printing 180 pages 360 pages -
L, photo, borderless printing 1,080 pages 1,980 pages -
Color
Postcard, photo, borderless printing 360 pages 1,260 pages -
(c) Years of use
5 years of use
(2) Ink tank
BCI-3eBK: 900 pages (JEIDA STD patternJ1, plain paper standerd mode)
740 pages (Black 1,500 character pattern, plain paper / standard mode)
1,300 pages (ISO JIS-SCID No. 5 / plain paper / standard mode)
BCI-6C: 550 pages (ISO JIS-SCID No. 5 / plain paper / standard mode)
BCI-6M: 430 pages (ISO JIS-SCID No. 5 / plain paper / standard mode)
BCI-6Y: 360 pages (ISO JIS-SCID No. 5 / plain paper / standard mode)
BCI-6BK: 2,000 pages (ISO JIS-SCID No. 5 / plain paper / standard mode)
1-4 Special Tools
Name Tool No. Application Remarks
MOLYKOTE
HP300
CK-8012-000 To be applied to the chassis' upper gear,
and to the sliding portion of the shaft lift.
New
FLOIL KG-107A QY9-0057-000 To be applied to the sliding portion of the
carriage and the bearing portion of the
carriage shaft.
In common wit
h
other models.