Canon PIXUS 50i User manual

PIXUS 50i
i70
SERVICE MANUAL
Revision 0
QY8-1388-000
COPYRIGHT  2003CANON INC. CANON PIXUS 50i / i70 102001 XX 0.00-0 PRINTED IN JAPAN (IMPRIME AU JAPON)

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, 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 byany means or translated into
another language without the written permission of Canon Inc., except in the case of internal business use.
Copyright2003by Canon Inc.
CANON INC.
iPrinter Products Quality Assurance Div.
16-1, Shimonoge 3-chome, Takatsu-ku, Kawasaki, Kanagawa 213-8512, Japan

I. MANUAL OUTLINE
This manual consists of the following three parts to provide information necessary to service the i70:
Part 1: Maintenance
Information on maintenance and troubleshooting of the i70
Part 2: Technical Reference
New technology and technical information such as FAQ’s (Frequently Asked Questions) of the i70
Part 3: Appendix
Block diagrams and pin layouts of the i70
Reference:
This manual does not provide sufficient information of disassembly and reassembly procedures. Refer to the
graphics in the separate Parts Catalog.

II. TABLE OF CONTENTS
Page Part 1: MAINTENANCE
1-11.MAINTENANCE
1-11.1 Adjustment, Periodic Maintenance, Periodic Replacement Parts, and Replacement
Consumables by Service Engineer
1-21.2 Customer Maintenance
1-21.3 Product Life
1-21.4 Special Tools
1-31.5 Serial Number Location
1-42. LIST OF ERROR DISPLAY / INDICATION
1-42.1 Operator Call Errors (by LED Blinking in Orange)
1-42.2 Service Call Errors (by LED Blinking in Orange and Green Alternately, or Lit in
Orange)
1-52.3 Warnings
1-62.4 Troubleshooting by Symptom
1-73. REPAIR
1-73.1 Notes on Service Part Replacement (and Disassembling/Reassembling)
1-93.2 Special Notes on Repair Servicing
1-15 3.3 Adjustment / Settings
1-19 3.4 Verification Items
1-21 4. PRINTER TRANSPORTATION METHOD
Part 2: TECHNICAL REFERENCE
2-11. NEW TECHNOLOGIES
2-22. CLEANING MODE AND AMOUNT OF INK PURGED
2-33. FAQ (Specific Problems and Solutions)
Part 3: APPENDIX
3-11. BLOCK DIAGRAM
3-22. CONNECTOR LOCATION AND PIN LAYOUT
3-22.1 Logic Board Ass’y
3-62.2 DC-DC Board Ass’y
3-82.3 USB Board Ass’y
3-92.4 Coin Battery Unit
3-92.5 Panel Board Ass’y
3-10 2.6 DCD Board Ass’y

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
EEPROM
initialization At logic board ass’y replacement To initialize settings other than the following:
-USB serial number
-Destination setting
-On-arrival cleaning flag
-Waste ink counter
-Infrared Plug& Play
on/off flag (to enable/disable
Plug & Play installation of
the printer driver for the
IrDA I/F)
None. 1 min.
Destination settings At logic board ass’y
replacement To set the destination. None. 1 min.
Waste ink counter
resetting When the following 4 items are replaced at the
same time:
-Drain pack ass’y
(QL2-0194)
-Ink absorbers
(QC1-1210/1211/1212)
To reset the waste ink
counter. None. 1 min.
Print head alignment At print head or logic
board ass’y replacement To ensure accurate dot placement. Computer (settings via
the printer
driver)
2 min.
(2) Periodic maintenance
No periodic maintenance is necessary.
(3) Periodic replacement parts
There are no parts in this printer that require periodic replacement by a service engineer.
(4) Replacement consumables
There are no consumables that require replacement by a service engineer.

1 -2
1.2 Customer Maintenance
Adjustment Timing Purpose Tool Approx.
time
Print head alignment At print head
replacement To ensure accurate dot placement. Computer (settings via
the printer
driver)
5 min.
Print head cleaning When print quality is
not satisfying. To improve nozzle conditions. Printer, or computer
(settings via
the printer
driver)
30 sec. to
1 min.
Print head deep cleaning When print quality is
not satisfying, and not
improved by print head
cleaning
To improve nozzle
conditions. Computer (settings via
the printer
driver)
1.5 to 2.5
min.
Ink tank replacement When an ink tank
becomes empty. ----- ----- 2 min.
Paper feed roller
cleaning When paper does not feed properly. To clean the paper feed rollers. None. 2 min.
Battery charging When the batterypower
becomes low. To charge the battery. Battery charger
120 min.
1.3 Product Life
(1) Printer
The value (i) or (ii), whichever comes first.
(i) 10,000 pages of printing (3,500 pages in color + 6,500 pages in black)
-Color: 7.5% duty per color pattern printing
-Black: 1,500 character pattern printing
(ii) 5 years of use
(2) Print head
10,000 pages of printing (3,500 pages in color + 6,500 pages in black)
-Color: 7.5% duty per color pattern printing
-Black: 1,500 character pattern printing
(3) Ink tank
BCI-15Black: 185 pages (1,500 character pattern in black printing, plain paper, standard mode)
390 pages (ISO JIS-SCID No. 5 pattern, plain paper, standard mode)
BCI-15Color: 100 pages (ISO JIS-SCID No. 5 pattern, plain paper, standard mode)
(4) Battery pack (option)
300 times of charging and discharging
1.4 Special Tools
Name Tool No. Purpose Remarks
MOLYKOTE 7508 QY9-0059-000 To be applied to the surface of
the mold part at the joint of the
purge unit at drain pack ass’y
replacement
5g tube
Tape, Yellow QY9-0060-000 To secure the flexible cable and
harness
Tape, Black QY9-0061-000 To protect the harness from
damaged by the plate edge.

1 -3
1.5 Serial Number Location
On the back of the printer unit (the base unit)

1 -4
2. LIST OF ERROR DISPLAY / INDICATION
Errors are indicated by the LED, and warnings are displayed on the monitor of the computer connected to
the printer.
2.1 Operator Call Errors (by LED Blinking in Orange)
LED
blinking in
orange Error Solution Remarks
2 times No paper. Set the paper, and press the
Resume/Cancel button.
3 times Paper jam. Remove the jammed paper, and press
the Resume/Cancel button.
6 times The print head is not installed. Install the print head, and close the print
head cover.
7 times The print head is not installed
properly. (EEPROM data of
the print head is faulty.)
Re-install the print head, or with the
print head installed, turn the printer off
and on.
8 times Warning: The waste ink
absorber becomes almost full
(to approx. 95% of the
maximum capacity).
Pressing the Resume/Cancel button will
exit the error, and enable printing.
In repair servicing, replace the 4-item
set of the drain pack ass’y (QL2-0194)
and the 3 ink absorbers
(QC1-1210/1211/1212) at the same
time.
The service call
error, indicating the
waste ink absorber
is full, is likely to
occur soon.
9 times The black or color ink tank is
not installed, or not installed
properly.
Install both the black and color ink
tanks. If they are installed, reseat them
properly.
If the error persists
after the ink tanks
are seated properly,
the ink tank sensor
is likely to be
faulty.
10 times Low battery Charge the battery, or connect the AC
adapter to resume printing.
2.2 Service Call Errors (by LED Blinking in Orange and Green Alternately,or Lit
in Orange)
LED
alternate blinking
in orange and
green
Error Solution
2 times Carriage error Replace the logic board ass’y*1, or the print unit.
4 times Purge unit error Replace the print unit.
6 times Internal temperature
error Replace the print unit.
7 times Waste ink absorber full Replace the 4-item set of the drain pack ass’y (QL2-0194) and
the 3 ink absorbers (QC1-1210/1211/1212) at the same time*2.
8 times Print head temperature
rise error Replace the print head, or the logic board ass’y*1.
9 times EEPROM error Replace the logic board ass’y*1.
Lights in orange RAM error Replace the logic board ass’y*1.
*1: As the waste ink counter is reset when the logic board ass’y is replaced, also replace the 4-item set of the
drain pack ass’y (QL2-0194) and the 3 ink absorbers (QC1-1210/1211/1212) at the same time.
*2: The waste ink absorber full error occurs when either the main waste ink absorber (drain pack ass’y) or the
borderless printing waste ink absorber (ink absorber) becomes full. For this reason, all the waste ink
absorbers should be replaced at the same time.

1 -5
2.3 Warnings
(1) Printer (no LED indications)
Displayed warning Remarks
Low black ink warning 1 (About half of the full amount
remains.)
Low color ink warning 1 (About half of the full amount
remains.)
Low black ink warning 2 (Little ink remains. “!”)
Low color ink warning 2 (Little ink remains. “!”)
Low black ink warning 3 (An unknown amount remains.
“?”)
Low color ink warning 3 (An unknown amount remains.
“?”)
The status is displayed on the monitor ofthe
computer connected to the printer*1.
Print head temperature rise warning If the print head temperature is high when the
print head cover is opened, the warning is
displayed*2. When the print head temperature
falls, the warning is released.
Protection of excess rise of the print head temperature If the print head temperature exceeds the
specified limit, a Wait is inserted during
printing,
Battery low warning The status is displayed (except under Windows
95/98/Me) on the monitor of the computer
connected to the printer, and the warning is
indicated by the battery charger LED.
*1: Only when the remaining ink amount detection function is enabled. (When it is disabled, there is no status
display.)
*2: At the warning, the carriage does not move to the ink tank replacement position when the print head cover
is opened.
(2) Battery charger (indicated by the lighting/blinking of the charger’s 3 green
LEDs)
LED status Warning Remarks
3 LED’s light during use of
the printer. Sufficient battery power.
2 LED’s light during use of
the printer. Some battery power used.
1 LED lights during use of
the printer. Warning of remaining battery power. The battery needs to be charged.
1 LED blinks during use of
the printer. Low battery error. The battery needs to be charged. On the printer, the LED blinks in orange 10 times.
3 LED’s blinks sequentially
during use of the printer. The battery power is being checked.
3 LED’s blink during
charging. Charging not sufficient.
3 LED’s light during
charging. Charging almost completed. (not full) When the battery is fully charged, the 3 LED’s are extinguished.
2 LED’s at both ends blink
alternately. The battery is faulty. Replace the battery pack.
2 LED’s at either end and at
the center blink alternately. Out of the specified operating environment temperature
range (5 to 35C),
high temperature of the battery
pack,
faulty battery, or
faulty battery charger.
Use the unit in the specified temperature (5
to 35C),
remove the AC adapter and wait for a while,
replace the battery pack, or
replace the battery charger.

1 -6
2.4 Troubleshooting by Symptom
Symptom Solution Remarks
The power does not turn on.
The power turns off immediately
after power-on.
Replace the
-AC adapter,
-battery pack,
-DCDC board ass’y, or
-logic board ass’y*1.
To check the AC adapter,
with the AC adapter alone
and turned on, connect the
tester, and confirm that the
output voltage fluctuates
regularly between 13.5V
to 16.5V.
The print head is not recognized.
The print head does not move to the
home position.
Remove and re-install the print
head, or replace the print head, or
logic board ass’y*1.
A strange noise occurs. Remove foreign material, or
attach a removed part if any.
The ink tank is not recognized. (The
no ink tank error occurs even when
the ink tanks are seated.)
Replace the print unit (the ink
tank sensor is faulty).
Faulty operation
Printing stops mid-way. Replace the logic board ass’y*1.
Multiple sheets feed. Replace the print unit.
Paper does not feed. Remove foreign material, or
replace the print unit, or the
pressing plate unit.
Paper feed problems
Paper feeds at an angle. Remove foreign material, adjust
the paper guide, or replace the
pressing plate unit.
No printing, or no color ejected. Replace the
-ink tank,
-print head*2,
-DCDC board ass’y,
-logic board ass’y*1, or
-print unit.
Printing is faint, or white lines
appear on printouts even after print
head cleaning.
Line(s) not included in the print
data appears on printouts.
Remove and re-install the print
head, or replace the
-ink tank,
-print head*2,
-print unit, or
-logic board ass’y*1.
Paper gets smeared. Feed several sheets of paper, clean
the paper path with cotton swab or
cloth, or replace the print unit.
A part of a line is missing on
printouts. Replace the -ink tank, or
-print head*2.
Color hue is incorrect. Replace the print head*2.
Printing is incorrect. Replace the
-print unit, or
-logic board ass’y*1.
No ejection of black ink. Replace the
-ink tank, or
-print head*2.
Unsatisfactory print quality
Graphic or text is enlarged on
printouts. Clean grease or oil off the timing slit strip film, or replace the print
unit, or logic board ass’y*1.
*1: As the waste ink counter is reset when the logic board ass’y is replaced, replace also the 4-item set of the
drain pack ass’y (QL2-0194) and the 3 ink absorbers (QC1-1210/1211/1212) at the same time.
*2: Replace the print head only after the print head deep cleaning is performed 2 times, and when the
problem persists.

1 -7
3. REPAIR
3.1 Notes on Service Part Replacement (and Disassembling/Reassembling)
Service part Notes on replacement*1 Adjustment/settings*2 Operation check
Print unit
(QM2-0290) -Be careful ofthe ferrite core position.See page
1-9 (1), for details.
After replacement:
-Perform the print head
alignment in the user
mode.
-Service test print
Logic board ass’y
(QM2-0237) -Also replace the 4-item set of the drain pack ass’y
and the 3 ink absorbers.
See page 1-12 (3), for
details.
-The absolute time setting
is necessary, as the coin
battery unit is removed.
See page 1-12 (2), for
details.
After replacement:
1. Initialize the
EEPROM.
2. Set the destination in
the EEPROM.
3. Perform the print head
alignment in the user
mode.
4. Perform the printhead
cleaning 1 time.
-Service test print
DCDC board ass’y
(QM2-0238) -Service test print -Printing with the
battery power
Coin battery unit
(QM2-0292) -The absolute time setting is necessary. See page
1-12 (2), for details.
-Special attention should
be paid to disposal of the
coin battery unit*3.
After replacement:
1. Perform the print head
alignment in the user
mode.
2. Perform the print head
cleaning 1 time.
-Service test print
Drain pack ass’y
(QL2-0194)
Ink absorber
(QC1-1210/1211/1212)
-These 4 items should be
replaced at the same time.
See page 1-12 (3), for
details.
-Confirm that no ink
leakage occurs from the
joint point between the
drain pack ass’y and the
purge unit. See page 1-12
(3), for details.
At replacement:
1. For the drain pack
ass’y, apply a thin coat
of grease (QY9-0059)
to the surface of the
mold part at the joint
of the purge unit. See
page 1-12 (3), for
details.
After replacement:
2. Reset the waste ink
counter.
-Service test print
Pressing plate unit
(QM2-0300) -The spring can be extended only 5mm or
less.
-In installing the unit,
make sure that the paper
lifting plate is not under
the paper return tab. See
page 1-13 (4), for details.
-Service test print
Main case unit
(i70: QM2-0287)
(PIXUS 50i:QM2-0310)
-In assembling, keep the
print head cover closed,
to protect the cover sensor
from damage. See page
1-14 (5), for details.

1 -8
(Notes on Service Part Replacement -cont’d-)
Service part Notes on replacement*1 Adjustment/settings*2 Operation check
Base ass’y
(QL2-0193) -Service test print
Door sensor board ass’y
(QM2-0240) -Service test print after the print head
cleaning
DCD board ass’y
(QM2-0242) -Direct printing from a digital
camera
USB board ass’y
(QM2-0312) -Printing via the USB cable
Timing slit strip film
(QC1-1143) -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.
-Perform the print head
alignment in the user
mode.
-Service test print
Print head
(QY6-0046) -Perform the print head alignment in the user
mode.
-Service test print
*1: General notes:
-Make sure that the flexible cables and wires in the harness are in the proper position and connected
correctly. See page 1-9 (1), for details.
-Do not drop the ferrite core, which may damage it.
-Protect electrical parts from damage due to static electricity.
-Do not touch the timing slit strip film. No grease or abrasion is allowed.
-Protect the units fromsoiled with ink.
-The blue screws are removable, and do not require any specific adjustment.
*2: If the yellow tape (QY9-0060) or black tape (QY9-0061) is removed, attach the new tape.
*3: For environment protection, dispose of the coin battery unit’s lithium battery according to local regulations.

1 -9
3.2 Special Notes on Repair Servicing
(1) Flexible cable and harness wiring, connection
Be careful of wiring of the flexible cables and harness, and positioning of the yellow tape (QY9-0060) to
fix the harness and the black tape (QY9-0061) to fix the coin battery unit and to protect the harness from
damaged. Improper wiring or connection may cause breakage of a line, leading to ignition or emission of
smoke.
<Flexible cables to the flexible cable holder>
<Carriage flexible cable wiring and connection>
Carriage flexible cable
Ferrite core for the carriage
flexible cable (WE8-6074)
DCDC board ass’y
(QM2-0238)
Logic board ass’y
(QM2-0237)
Purge sensor flexible cable
(QK1-0053)
Panel flexible cable
(QK1-0051)
IrDA flexible cable
(QK1-0052)
Bottom View

1 -10
<Harness wiring>
DCD harness
Coin battery unit
CR motor harness
AP motor harness
Shield plate
USB harness
DC jack harness
(under the shield plate)
LF motor cable
Complete Harness Wiring
Coin Battery Unit Removed
Shield Plate Removed
Bottom View

1 -11
<Yellow tape locations>
<Black tape locations>
To secure the panel flexible cable
(QK1-0051)
To secure the DCDC board harness
Print Unit and Drain Pack Ass’y Top View
To secure the panel flexible cable
(QK1-0051)
To secure the purge sensor flexible cable
(QK1-0053)
To secure the flexible cable holder
(QC1-1310)
Print Unit and Drain Pack Ass’y Bottom View
To protect the carriage motor harness
To securethe built-in coin battery unit
(QM2-0292)

1 -12
(2) Absolute time setting when the coin battery unit is removed
To keep the absolute time, a Real Time Clock (RTC) is built into the coin battery unit (QM2-0292). When
the coin battery unit is removed, the RTC is reset. After re-installing the coin battery unit, be sure to set the
absolute time to the RTC in the following procedures:
How to set the absolute time:
1) To set the absolute time to the RTC, connect the printer to the computer, and perform the print head
alignment from the printer driver utility. (Printing from the connected computer can also set the
absolute time.)
2) To set the last cleaning time to the EEPROM, perform the print head cleaning.
Note: If the absolute time is not set, the long timer cleaning (for more than 2 minutes, with high ink
usage) will be performed at start of the second printing after installation of the printer by a
customer.
(3) Waste ink absorber (drain pack ass’y, ink absorber) replacement
Be sure to replace the 4-item set of the drain pack ass’y (QL2-0194) and 3 ink absorbers
(QC1-1210/1211/1212) always when the following occurs:
-when the waste ink counter is reset
-when the logic board ass’y is replaced
Reason for replacement of the 4 items:
When the waste ink counter is reset, the ink amount data of both the main waste ink absorber (the drain
pack ass’y) and the borderless print waste ink absorbers (the ink absorbers) are reset.
When installing the drain pack ass’y, take care of the following:
-Apply a thin coat of Molykote 7508 (QY9-0059) to the surface of the cylinder-shaped mold at joint of the
purge unit (shown in the figure below). Do not apply the grease to anywhere other than the specified area.
-Pull out the absorber at the joint of the purge unit 2 to 3mm and straighten it (as shown in the figure
below), so that it will fit it into the slot of the drain pack ass’y. Make sure that the absorber is not caught
between the drain pack ass’y and the purge unit. (If caught, ink leakage is likely to occur.)
Drain pack ass’y (QL2-0194) Apply Molykote 7508 (QY9-0059) here.
Drain pack ass’y (QL2-0194)
Purge unit joint absorber:
Pull this out 2 to 3mm,
and straighten it.

1 -13
(4) Pressing plate unit installation
When installing the pressing plate unit (QM2-0300), take care that the paper lifting plate is not under the
paper return tabs of the print unit. (If placed under the paper return tabs, the paper lifting plate will not
move up and down properly.) With regard to the spring, do not extend it more than 5mm. (If the spring is
extended more than 5mm, it may cause skewed paper feeding.)
<Paper lifting plate positioning -not under the paper return tabs ->
-Paper return tab location (2 locations)
-Pressing plate unit parts should not be set under the paper return tabs
-Correct position of the paper lifting plate and paper return tab
Make sure these parts are not
under the paper return tabs.
Paper return tab
Before Installing the Pressing Plate Unit
Correct position of the paper lifting
plate and paper return tab
Sheet Feeder Side View
Pressing Plate Unit Back Side View

1 -14
(5) Main case unit assembling
When assembling the main case unit (QM2-0287/0310), assemble with the print head cover in the closed
position. If the print head cover is open, the print head cover switch on the back of the main case unit will
contact the cover sensor of the door sensor board ass’y (QM2-0240), and the sensor is likely to be
damaged.
<Print head cover when assembling the main case unit>
<Print head cover switch on the back of the main case unit>
<Cover sensor>
The print head cover should be closed.
Print head cover switch
(when the print head cover is closed)
Cover sensor:
Special attention should be paid,
as it is easy to bend.

1 -15
3.3 Adjustment / Settings
(1) User mode
Function Procedures Remarks
Print head manual cleaning -Cleaning both black and color:
See “Standalone printer operation”below.
-Cleaning black orcolor separately, or both
black and color:
Perform from the printer driver utility.
Print head deep cleaning -Cleaning black or color separately, or both
black and color:
Perform from the printer driver utility.
Paper feed roller cleaning See “Standalone printer operation”below.
Nozzle check pattern printing See “Standalone printer operation”below.
Print head alignment 1. Perform the print head alignment printing
from the printer driver utility.
2. According to the printout, set the optimum
values.
Print head replacement 1. Open the print head cover. (The carriage
will move to the ink tank replacement
position.)
2. Press and holdthe Resume/Cancel button
for 2 seconds or longer. (The carriage will
move to the print head replacement
position.)
3. Replace the print head.
<Standalone printer operation>
1) Turn on the printer.
2) Press and hold the Resume/Cancel button until the LED blinks the specified number of times listed in
the table below, and release it. The operation starts.
LED blinking Operation Remarks
1 time Print head manual cleaning
2 times Nozzle check pattern printing
3 times Paper feed roller cleaning
4 times or more Unspecified
(2) Service mode
Function Procedures Remarks
Service test print
Destination
ROM version
Waste ink amount
Number of pages printed
See “Service mode operation
procedures”below. Set a sheet of A4-or larger-sized paper. For print sample, see page 1-20.
EEPROM initialization See “Service mode operation
procedures”below. The following items are not initialized: -USB serial number (0 to 5)
-Destination settings (JPN / Overseas)
-Cleaning on arrival flag
-Waste ink counter
-Infrared PnP on/off flag (the flag to
enable/disable Plug & Play installation
of the printer driver for the IrDA I/F)
Waste ink counter reset See “Service mode operation
procedures”below. Both the main and the borderless print waste ink counters are reset at the same
time.
Destination settings See “Service mode operation
procedures”below. Overseas: i70 Japan: PIXUS 50i