Canon BJC-55 Series User manual

BJC-55
SERVICE
MANUAL
Canon

Issued by BJ Products Quality Assurance Center, Canon Inc.
NO. :
DATE:
MODEL:
Printed in Japan
DETAIL
This bulletin has been issued to notify of the differences between the BJC-50/50v and
BJC-55/BJ M40 for servicing. This has been issued as a substitute for the Service
Manual, which will not be issued. The details of this bulletin are included in the electronic
manual for the BJC-55/BJ M40 (CD-ROM, QY8-9035-D1C) as a reference manual.
C.IWS applies to the BJC-55/BJ M40.
TABLE OF CONTENTS
1. PRODUCT OUTLINE
2. CHANGES FROM THE BJC-50v
3. EXTERNAL APPEARANCE
4. SPECIFICATIONS
4.1 Printer Specifications
4.2 Number of Pages Printable of the Cartridges
4.3 Printer Driver / Scanner Driver Type
4.3.1Restrictions on IrDA communication under Windows 2000
4.4 Interface Specifications
4.4.1IrDA interface
4.4.2USB interface
4.5 Photo BJ Cartridge Specifications
5. OPERATION
5.1 Function Setting
5.2 Ink Low Warning Reset By Button Operation
5.3 Direct Printing Function Of Images From Digital Cameras
5.4 Flash ROM Writing Operation
5.4.1Writing method
5.4.2Writing error
5.4.3USB port selection
6. TECHNICAL REFERENCE
6.1 5V Power Supply Circuit Change
7. SPECIAL TOOLS
8. PARTS LIST
9. CIRCUIT DIAGRAM
BJ M40 / BJC-55
Rev. 01: Augst 22, 2000
The information on the BJC-55 has been added.
QK-12E-0129
July 5, 2000
Main Unit
Differences between BJC-50/50v and BJC-55/BJ M40

1. PRODUCT OUTLINE
The BJC-55/BJ M40 are mobile, color BJ printers targeting the personal-use market. As a
successive model of the BJC-50/50v, the ease of connection has been improved, mobile
printer function has been strengthened, and the following functions have been added:
(1) The high-speed IrDA (Ver.1.1) enables the printer to attain print speed comparable
to that of the Centronics interface.
(2) Direct printing from digital cameras with IrTran-P. (BJ M40 only)
(3) Support of the USB I/F function.
(4) Photo printing function.
2. CHANGES FROM THE BJC-50/50v
1) New adoption of the photo cartridge (Photo printing function has been added.)
2) The IrDA version upgrade from Ver. 1.0 to 1.1 has enabled faster transmission.
3) New adoption of IrTranP (Direct printing from digital cameras/BJ M40 only).
4) Parallel interface has been eliminated. USB I/F has been adopted.
5) Button reset of the ink low warning is added.
6) Demonstration pattern printing is eliminated.
(The other self test print can be performed by the same operation as with the BJC-50/50v.)
7) Various specifications
8) A special tool (spur cleaner) is included.
3. EXTERNAL APPEARANCE
The BJC-55/BJ M40 has the same appearance as the BJC-50/50v, except for the following:
(1) The USB I/F connector has been positioned on the left side of the printer. Along with
this, the IrDA module has been moved, and the parallel interface has been eliminated.
(2) The color of the panel switch has been changed from an opaque to a transparent purple.
(3) The color of the lock switch has been changed from black to the same purple as the
panel switch.
(4) The line direction along the head cover of the upper cover has been changed.
1
Changed from black to purple.
Changed from an opaque to
a transparent purple.
The line direction has been changed.
IrDA Interface Module
USB Interface Connector

4. SPECIFICATIONS
4-1. Printer Specifications
Type Mobile serial color bubble jet printer
Paper feeding Manual sheet feed / Auto sheet feed (when the optional ASF-50 has
method been installed.)
Printing speed Throughput: High Speed Standard High Quality
BC-10 Bk Cartridge
New monochrome pattern (E) 5.5 ppm 5.0 ppm -----
New monochrome pattern (J) 5 ppm 5.0 ppm -----
BC-11e Color Cartridge
New color pattern (E) 2 ppm 1.6 ppm -----
New color pattern (J) 2.0 ppm 1.8 ppm -----
BC-12e Photo Cartridge ----- ----- 0.1 ppm
Full address printing
Printing direction Unidirectional (automatically selected according to the print data)
Max. Print Width 203 mm (8 inches)
Line feed pitch 136 ms/line (128" /360" line feed)
Built-in print LQ mode (BJC-55 only) / BJ mode (BJ M40 only) / Native mode /
control mode BJL command
Detection functions Presence of paper: Available
Presence of BJ cartridge: Available
Waste ink amount: Available
Paper width: Not available
Distinction of BJ cartridge: Available
Ink low: Available (by using the dot-count)
Noise Sound pressure level: conforms to ISO9296
Approx. 43 dB (A) or less during operation (HQ/HS mode)
Environmental During operation Temperature 5oC to 35oC (41oF to 95oF)
requirements Humidity 10%RH to 90%RH (no condensation)
Non operation Temperature 0oC to 35oC (32oF to 95oF)
Humidity 5%RH to 95%RH (no condensation)
Power supply Input voltage/Frequency: AC100 -240V, 50/60 Hz
Power consumption
Printing status Standby status Soft power off Charging status
Approx. 23 W* Approx. 1.7 W** Approx. 0.9 W** Approx. 10 W**
Approx. 1.8 W*** Approx. 1.0 W*** Approx. 10 W***
Approx. 2.6 W**** Approx. 1.6 W**** Approx. 10 W****
*: Approx. 30 W when the AC adapter is used.
**: When the input power is AC 100V.
***: When the input power is AC 120V.
****: When the input power is AC 230 - 240V.
External dimensions 302 mm (W) x 112.5 mm (D) x 50 mm (H)
Weight Approx. 0.9 Kg (including BJ cartridge)

3
4-2. Number of Pages Printable of the Cartridges
Black BJ Cartridge BC-10: Approx. 270 pages (JAIDA J1 Pattern: Japanese
measurement pattern for pages printable)
(1500 character pattern: Overseas measurement
pattern for pages printable)
Color BJ Cartridge BC-11e: Bk: Approx. 160 pages (ISO JIS-SCID N5 Pattern)
Cl: Approx. 50 pages (ISO JIS-SCID N5 Pattern)
Color BJ Cartridge BC-12e Photo: Bk: Approx. 60 pages
(ISO JIS-SCID N5 Pattern, High resolution paper)
Cl: Approx. 20 pages
(ISO JIS-SCID N5 Pattern, High resolution paper)
Bk: Approx. 90 pages
(ISO JIS-SCID N5 Pattern, Plain paper)
Cl: Approx. 35 pages
(ISO JIS-SCID N5 Pattern, Plain paper)
Note: See
"4-5 Photo BJ Cartridge Specifications" for details of the BC-12e.
4-3. Printer Driver / Scanner Driver Type
Valid driver and interface part combinations for this printer are shown below.
Printer Driver Scanner Driver
USB I/F Infrared I/F USB I/F Infrared I/F
Windows 95/98 ∆*1 ∆*2 Ο∆
*4
Windows 2000 Ο∆
*3 Ο∆ *4
Windows CE ΟΟ XX
Macintosh ΟXΟX
Ο: Compliant ∆: Conditionally compliant X: Not compliant
*1 The operation of the printer driver supporting USB is assured only in preinstalled
Windows 98 PCs.
*2 IrDA 1.1 is assured only in preinstalled Windows 98/2000 PCs,
except PC-9800 series.
*3 Except PC-9800 series. Restricted as shown in 4-3-1.
*4 Except PC-9800 series.
4-3-1. Restrictions on IrDA communication under Windows 2000
The following restrictions or problems occur in case of communication via IrDA under
Windows 2000, connecting with this printer.
<Restrictions>
As only one-way communication is possible, status information of the main unit cannot be
obtained, causing the following restrictions:
1) The status monitor does not function.
Therefore, the status monitor is disabled by default in the printer driver of this printer
in the case of communication via IrDA under Windows 2000. Users can start the
status monitor by selecting "Start Status Monitor" from the "Property" sheet, however,
"Communication Impossible" is indicated.

2) The installed cartridge is unknown.
3) The possibility of ink-low error is displayed only by printer LED. (The information
is not displayed on the host computer.)
4) The print job cannot be canceled from the host computer when an error has occurred.
After the cause of the error is resolved, the printer can be recovered by pressing the
RESUME button on the printer's operation panel. The error can then be recovered on
the host computer, although the ongoing print job is deleted.
Plug and Play is not supported.
<Possibly occurring problems>
1) The host computer occasionally fails to recognize the infrared port of the printer in
4Mbps communication. "Hard power reset," i.e. disconnection of the printer from mains
power and removal of the battery, is required to recover from this condition. The
frequency of occurrence and the duplication are low. In case of frequent occurrence,
however, this problem can be avoided by lowering the communication speed.
2) If the cleaning operations, etc., start during printing, the error message "Write error"
may be displayed on the host computer. When the cleaning operations, etc. are
finished, the error message disappears, and printing operations continue.
3) If another operation is executed at the host computer (eg., launching another
application) while printing a large file (printing photo images from Photoshop etc.),
paper may automatically be ejected, or the printer may reset.
4-4. Interface Specifications
The interface specifications of this printer are shown below.
1) Infrared Interface
IrDA Interface Ver. 1.1 / IrTranP
ASK Interface
2) USB Interface
<Differences from the BJC-50/BJC-50v>
1) The supported version of IrDA has been changed from Ver. 1.0 to 1.1.
2) IrTranP compliant. (BJ M40 only)
3) USB interface compliant.
4) Parallel interface has been eliminated.
4-4-1. IrDA Interface
1) Interface
IrDA Version 1.1 compatible
2) Optical specifications
Light generation
Wavelength: 0.85 to 0.90 µm
Intensity: 100 to 500 m W/Sr
Light angle: Approx. ±15o (along optical axis)
4

Light interception
Wavelength: 0.85 to 0.90 µm
Intensity: 4µ W/cm2to 500m W/cm2
10µ W/cm2to 500m W/cm2
(when the communication speed is more than 0.576 MHz.)
Light angle: Approx. ±15o (along optical axis)
3) Transfer speed 9600/19200/38400/57600/115.2k/576k/1.152M/4M bps
4) Communication Half duplex, start/stop system (bidirectional):
method when the transfer speed is less than 115.2kbps
Half duplex, frame synchronization system (bidirectional):
when the transfer speed is more than 0.576Mbps
5) Communication 0 to 1m: when the transfer speed is less than 115.2kbps
distance 0 to 0.8m: when the transfer speed is more than 0.576Mbps
6) Maximum data 2048 byte/packet
reception
7) Modulation method 3/16 RZI (Return to Zero Invert):
when the transfer speed is less than 115.2kbps
1/4 RZI (Return to Zero Invert):
when the transfer speed is 0.576Mbps and 1.152Mbps
4 PPM (Pulse Position Modulation):
when the transfer speed is 4Mbps
4-4-2. USB Interface
<Specifications>
1) Device structure Self-powered device
2) Data transfer Half duplex serial interface
method Universal Serial Bus Specification Revision 1.0 compatible
Universal Serial Bus Device Class Definition for Printing
Device Version 1.0 compatible
Signal rate: 12Mbps (full speed)
Transfer type: Control transfer/Bulk transfer
3) Input/output circuit No. Signal name
1 Vcc
2 -Data Data signal line
3 +Data Data signal line
4 GND
<Signal level>
Vcc: "H" level input voltage: +2.0V to +5.5V
"L" level input voltage: +0.0V to +0.8V
-Data, +Data: Differential input sensitivity: Min. 0.2V
"H" level input voltage: +2.8V to +3.6V
"L" level input voltage: +0.0V to +0.3V
4) Interface cable Material: AWG No.28 or larger
Full speed device cable (twisted pair shielded cable)
Less than 5 m
5) Interface connector Printer-side: USB (Series B) receptacle
Cable-side: USB (Series B) plug
5
Series B
12
43

4-5. Photo BJ Cartridge Specifications
Photo cartridge BC-12e
BJ cartridge BC-12e: Replaceable color BJ cartridge
(drop modulation adopted)
Ink cartridge BCI-12Bk: Black (64 nozzles)
Ink cartridge BCI-12Color: Yellow, Magenta, Cyan (24 nozzles x 3)
Weight Approx. 29 g (including both ink cartridges)
Print speed Approx. 0.1 ppm
(A4 full address printing: reference value)
Nozzle check pattern Same as the BC-11e
HR-Fine mode
Carriage motion: 3 pass
Printing nozzle: 8 nozzles
Resolution: 360 dpi
Carriage driving frequency: 5.00 kHz
Photo print mode can be used to obtain high level gradation print quality when using the
Photo BJ cartridge. These cartridges contain low density ink which achieves a rich
gradation and reduced graininess by printing several times over the same dot.
The printer driver divides the pixel data into a maximum of 4-values (not printed, print 1
dot, print 2 dots and print 3 dots) enabling each pixel to be printed in up to 4 gradations.
The printer therefore makes three passes using a maximum of 150% more ink than usual.
This Photo cartridge adopts drop modulation, decreasing granularity of the low density
parts by efficiently ejecting large and small ink droplets.
Head ID
Carriage ribbon cable contact part pin No. / Signal name
Head 11/ID0 12/ID1 13/HCONT
BC-10 L L H
BC-11e H L L
BC-12e H H L
No head installation error H H -----
The printer cannot detect ink cartridge type, and the ink cartridges suitable for the BC-11e
and BC-12e heads are not incompatible, so that the following installation problem may
occur. Regardless if the BCI-12 Bk/Color low density photo ink cartridge is installed in the
BC-11e by mistake, the printer recognizes it as the usual BC-11e color cartridge, resulting
in low density imaging. Likewise, if the BCI-11 Bk/Color cartridge is installed in the BC-
12e head, the opposite occurs and high density image printing takes place.
6

5. OPERATION
5-1. Function Setting
Default setting
The default settings can be selected by button operation when the power is turned on.
When the printer is turned on, hold down the
POWER button until the beeper sounds the
specified number of times for the desired function setting (BJ M40: Table1&2), and
release the POWER button to set. Function Setting
Mode Beeper Remark
Table 1 7 times Factory default setting (Japan/CCSI
/Canada/low voltage regions)
Table 2 8 times
Table 3 9 times Factory default setting (Others)
Table 4 10 times
Table 5 11 times
Table 6 12 times BJC-55 only
BJC-55
<Points of difference from the BJC-50>
1) No BJ mode setting
2) Addition of setting to enable/disable the ink low warning.
3) Addition of euro font setting (Code Page 858).
Table 1 Table 2 Table 3 Table 4 Table 5 Table 6
Print mode HQ HQ HQ HQ HQ ---
Left Margin LTR LTR A4 A4 A4 ---
Text Scale Mode Disable Disable Disable Disable Disable ---
Paper Feed Position 8.5 mm 8.5 mm 8.5 mm 8.5 mm 8.5 mm ---
Smoothing Disable Disable Disable Disable Disable ---
Reduction 1/1 1/1 1/1 1/1 1/1 ---
Automatic Power Off Enable Enable Enable Enable Enable ---
Font Roman Roman Roman Roman Roman ---
Font Lock Disable Disable Disable Disable Disable ---
Input/Download Buffer 25kB/0kB 25kB/0kB 25kB/0kB 25kB/0kB 25kB/0kB ---
Automatic Line Feed CR CR CR CR CR ---
International Character Set USA USA USA USA USA ---
Character Set Italics Italics Italics Italics Graphics Graphics
Code Page 437 437 437 437 858 858
Ink Low Warning Disable Enable Disable Enable Disable ---
Note:
The setting to enable Table 6 changes only "Character Set" and "Code Page." (That is,
"Character Set" and "Code Page" are changed to "Graphics" and "858," respectively.)
7

BJ M40
<Difference from the BJC-50v>
1) No setting regarding the LQ mode
2) The setting to enable/disable the ink low warning is added.
Table 1 Table 2
Operation mode change BJ BJ
Print mode HQ HQ
Automatic power off Enable Enable
Smoothing Disable Disable
Remaining ink Disable Enable
Reduction 1/1 1/1
Paper feed position 8.5 mm 8.5 mm
Receive buffer 23kB 23kB
ANK character quality Normal Normal
ANK character set Katakana Katakana
CR function (+LF) CR CR
ANK international Japan Japan
character
8

5-2. Ink Low Warning Reset By Button Operation
Ink low warning
This printer detects the remaining ink level by counting the number of ejected ink dots in
the same way as the BJC-50/50v. When the setting of the ink low warning is enabled, and
the remaining ink gets low, the beeper sounds twice, and the
ERROR INDICATOR blinks.
Pressing the Cartridge Replacement button will sound the beeper and move the carriage
to the center, and the ERROR INDICATOR indicates the ink cartridge for which the
remaining ink is low as shown below.
The ink low warning reset function by button operation is added to this printer. The button
operation procedures are shown below. (The ink low warning of the BJC-50/50v can be
reset from the host computer only.)
Operation
1) Turn on the printer.
2) Press the
Cartridge Replacement button to move the carriage to the center.
If the carriage was moved to the center by the driver, the reset operation by the
button operation is not possible.
3) Make sure that the proper cartridge is installed in the carriage. If not, install the proper
one. (The ink dot counter reset is effective only to the ink cartridge type installed in
the carriage.)
4) Press and hold the
RESUME button for the number of beeps corresponding to the
warned ink type to select the ink type for which the dot counter is to be reset, and
release the
RESUME button. The number of beeps is as follows:
Once: The dot counter of the BCI-10/BCI-11Bk/BCI-12Bk is reset.
Twice: The dot counter of the BCI-11Color/BCI-12 Color is reset.
3 times: The dot counter of the BCI-11Bk&Color/BCI-12Bk&Color is reset.
4 times: The selected ink type is canceled.
5) Press the
Cartridge Replacement button.
The dot counter of the ink selected in the procedure 4) and the ink low warning are
reset, and at the same time, the carriage returns to the home position.
9
Blinks once: when the remaining ink of the BCI-10 / BCI-11Bk / BCI-12Bk is little
Blinks twice: when the remaining ink of the BCI-11Color / BCI-12Color is little
Blinks 3 times: when the remaining ink of the BCI-11 BK & Color / BCI-12 BK & Color is little

5-3. DIRECT PRINTING FUNCTION OF THE IMAGE FROM DIGITAL CAMERAS
(BJ M40 only)
<Difference from the BJC-50/50v>
The new adoption of IrTranP has enabled the printing of data sent directly from
digital cameras compliant to IrTranP standards, not through the host computer, but
via IrDA communication.
Specifications
Data communication form: IrTranP standards compatible
Input image size: 640 x 460 pixels
Input image capacity: 128 Kbyte or less
Output image size: Landscape: 90 x 68 mm
Portrait: 77 x 103 mm
Seal printing: 19 x 26 mm x 16 images
Paper size: Postcard
Operation
<Image printing>
If the printer is powered on and receives print data from digital camera, the printing
operation will start.
<Reprinting>
The image data is also maintained in memory after printing, and will not be abandoned
until new image data is received from the digital camera, or print data is input from the
host computer. Reprinting of data is possible by pressing the
RESUME button (and
releasing before the beeper sounds).
<Printing cancellation>
During the printing of image data, printing is cancelled by pressing the RESUME button
until the beeper sounds once, then releasing. In this case paper is delivered. The
remaining data halfway through printing is abandoned. (As the image data has been
maintained, it is possible to reprint the data, without resending the data from the digital
camera.)
<Printing position definition>
To select the printing position, press the POWER button and Cartridge Replacement
button simultaneously when the power is on, and release the buttons after the beeper
sounds the number of times applicable to the printing position to be selected. This setting
returns to the default (Landscape) by powering off. The number of beeps is as follows:
Once: Portrait
Twice: 16-image seal printing
3 times: Photo glossy card landscape
4 times: Photo glossy card portrait
5 times: Setting completed.
10

5-4. Flash ROM Writing Operation
<Difference from the BJC-50/BJC-50v>
As the BJC-55/BJ M40 does not have a parallel interface, the firmware of the Flash
ROM is written using the "USB Loader."
5-4-1. Writing method
a) Download the USB Loader to the host computer.
(1) Send the USB Loader from the "Software download" page on QISS to the host
computer.
This software will operate only on Windows 98 OS computers.
Also, the BJC-55 / BJ M40 printer driver must be installed.
(2) Connect the printer which the firmware is to be written with the host computer.
Note that the printer should be turned off.
The other USB devices should be unplugged from the host computer.
(3) Open the USB loader with a double-click.
<Main Dialog Box of the USB Loader>
b) Enter the writing mode of the printer.
(1) Remove the DC plug of the universal adapter and the Lithium Ion Battery.
(2) While pressing the
RESUME button and Cartridge Replacement button, insert
the DC plug of the universal adapter and release the buttons after one long beep.
(3) Press the
RESUME button, and release the button after one short beep. When the
initial sequence finishes, another short beep will sound, the Power LED lights, and
the printer will enter the writing mode (stand-by-to-receive state.)
The
RESUME button does not work while in the writing mode.
Do not turn off the power with the
POWER button while in the writing mode.
c) Download the firmware.
(1) Download the firmware for upgrading from the software download page in QISS
into the host computer.
(2) Select "AUTO" from the "USB Port" in the main dialog box of the "USB loader."
11
Select a port.
Exit USB loader.
About USB loader.
(Version etc.)
Send the selected
file to the printer.
Open the dialog box for selecting a file.Select the file to be sent to the printer.

(3) Click "Open" to open the "Open" dialog box.
Select the file downloaded in the procedure (1).
Be sure to select the file from the "Open" dialog box. If the file name is input directly
in the "File Name" of the main dialog box, the file name will not be selected properly.
(4) Make sure that the selected file name and pass name are correctly indicated in the
"File Name" of the main dialog box.
(5) Click "Send" to download the selected file to the printer.
The writing process takes approx. 40 seconds, however, it may occasionally
take longer, depending on the performance of the host computer and the transfer
speed of the OS.
Please be careful not to turn off the power by unplugging the DC plug during
file-writing operation.
(6) The Power Indicator of the printer blinks while the Flash ROM is being written to.
(7) When the short beeps sound twice on the printer side, and the Power LED lights,
the writing operation has completed.
(8) After confirming the completion of the writing operation, unplug the DC plug from the
printer. Unplugging the DC plug ends the writing mode.
(9) Confirm whether the writing has normally finished by outputting the list of the
function setting status.
<How to output the list of the function setting status>
Attach the DC plug of the Universal Adapter, and install the battery in the printer.
Then, press the
POWER button at soft-power-off status, and release the button after
two beeps. (For details, refer to "3.4. Self Test" in Chapter 3 "OPERATION" of the
BJC-50/50v Service Manual.) 12
Click here after
selecting the file.
Select the file to be
sent to the printer.
Make sure that the selected file
name and pass name are correctly
indicated.
Pass Name File Name
Example:
C:¥My documents¥BJC55v 1000.DL

5-4-2. Writing error
If a writing error occurs, the following information is indicated on the printer:
Error Condition Power LED Error LED Beeper
Data error Lights Blinks Two long beeps
Flash error Blinks Reverse blink with the Power LED Two long beeps
RAM error Blinks Synchronous blink with the Power LED Two long beeps
If an error occurs, implement the following countermeasure:
Data error occurs:
As error checking is performed with each data set, when the error is been detected, the
data has already been written. After also confirming the connection to the computer, re-
enter the writing mode and transfer the correct data.
Flash error occurs:
As error checking is performed with each data set, when the error is been detected, the
data has already been written. Re-enter the writing mode and transfer the correct data. If
the same error occurs, the flash ROM may be damaged. Replace the Control Board.
RAM error:
Occurs when the RAM memory to be used for writing on the printer side is checked. The
writing operation is not being performed. Replace the Control Board of the printer.
5-4-3. USB port selection
Each machine with a USB I/F has a unique ID, and the USB port of the host computer
(USBPRNxx) is exclusively assigned to this. If a new USB device is connected, a USB
port for the device is newly assigned. The USB port for the writing mode is assigned in the
ROM writing mode of BJC-55/BJ M40. The ports which are enabled by the USB Loader
are from 1 to 99. Note that only the USB ports assigned for writing mode from
"USBPRN01" to "USBPRN99" are correctly written to.
13

6. TECHNICAL REFERENCE
6-1. 5V Power Supply Circuit Change
The signal lines for obtaining head information (HRANK signal, ID0 signal, ID1 signal,
HCONT signal, and HDIS signal) are common with the power resource "Vcc1" for the
Logic Board IC of the BJC-50/50v. The Vcc4 power resource circuit has newly been
added as a 5V power resource of the BJC-55/BJ M40 for the signal lines for obtaining
head information.
The Vcc4 is the sequence which goes ON periodically, and only at soft-power-on. As a
result, the load to the print head caused by applied voltage has been reduced.
<5V/3V Power Creation Circuit Block Diagram>
<Head Interface (Changed Part)>
14
+5V DC
Power Source
: Sensors
: BJ cartridge
(Logical power source)
:MPU, EEPROM, DRAM
Printer Controller
Motor Driver
Control ROM
: USB Interface
Regulator
(IC17)
DC/DC
Converter
(IC4)
Newly-assigned circuit
V2-ON
V3-ON
Printer Controller
(IC6)
Vcc1 (+5VDC)
Vcc2 (+5VDC)
Vcc3 (+5VDC)
3Vcc (+3.3VDC)
Vcc4 (+5VDC):
For obtaining head information
V4-OFF
Amplifier
Circuit DIA
ID0
ID1
21
19
18
17
20
1
Vcc4Vcc4
Vcc4
CNH1
TOP
ID0
ID1
IHKS2
DIK
HRANK
HDIS
Vcc4
HCONT

7. SPECIAL TOOLS
If spur marks are left on the print images, the spurs can be cleaned by using the spur
cleaner. The spur cleaner is reusable until it loses its' effectiveness.
Special tool (part number) Remarks
Spur cleaner (QY9-0055-000) For cleaning spurs
Usage
1) Moisten the fabric part of the spur cleaner with Approx. 5cc of water. Moisten the fabric
with the water, as shown below, so that the fabric absorbs the water from end to end.
Be especially careful that the area contacting the spurs absorbs enough water.
In case too much water is used, there is the possibility that water will be wrung
from the spur cleaner when passing through the paper feed roller, spread inside the
printer, and cause failure.
2) Open the paper feeding tray.
3) Set the spur cleaner with the fabric-affixed part of the cleaner face-up and away. When
the spur cleaner is set into the paper feeding opening, it is automatically fed into the
main unit, and stops at the print start position.
4) Press the
RESUME button, and release it after the beeper sounds once. The spur
cleaner is delivered. For heavy soiling, repeat procedures 3) to 4) approx. 5 times.
5) Set a single sheet of paper to the ASF and repeat procedures 3) and 4). (To remove the
moisture remaining in the paper feeding path.)
15
Fabric (white-colored)
Spur Cleaner
Part moistened with water
Be careful that the water
is absorbed by the
fabric from end to end.
Transparent film
Spur cleaner
Fabric

8. PARTS LIST
BJC-55 BJ M40
Upper Case Unit QG5-1536 QG5-1537
Head Cover QB1-4700 QB1-4701
Instruction Film QB1-4763 QB1-4762
Upper Case QB1-4696 QB1-4697
Control PCB Ass'y QG2-3208 QG2-3209
Flash ROM QH8-0893 QH8-0894
Other parts are common with the BJC-55/BJ M40.
For details, refer to the BJC-55/BJ M40 Parts Catalog (QY8-31AT-010).
16

9. CIRCUIT DIAGRAM
Control Board (Common to BJC-55/BJ M40)
17
12345678910
A B
C D
E
F
G
CONTROL PCB ASS'Y 01
Vpp Vcc1
Vcc1
Vcc1 Vcc2 Vcc3
VH
Vpp
CNBT1
1 2
F1
ZD1 C1
0.1µ,25V C2
470µ,25V
R1
11.5K,1/16W
D5
R2
1K,1/16W C3
0.1µ,25V C4
1µ,16V
1 2 3 4
8 7 6 5
CT VSC OUT GND
RESET
VSA
VSB/RIN
VCC
IC1
C5
0.1µ,25V
C6
0.1µ,25V
R3 180K,1/16W R4 33K,1/16W
R5 10K,1/16W
C7 100p,50V
RESET
Q6
Q7
Q9
Q17
12
3
12
3 2
1
3
3
2
1
ZD2
D3
V2-ONC
V3-ONC
R9 4.7K,1/16W
C12 1000µ,6.3V
R8
100,1/16W
L1
D2
1 24
3
VIN SW GND
F/B
IC4
ICP1
Q5
R7 1M,1/16W
32
1
L2 D8
LF-PRT
D9 ZD3
C19 470µ,35V
C17 0.1µ,25V
R25 15K,1/16W
R24
68K,1/16W
R26
820,1/16W
C16
3300p,50V
Q16
Q14
Q15
3
2
1
32
1
3
2
1
R27
330K,1/16W
R23
330K,1/16W
LFREF1
DCLEV
C15
3300p,50V
Q13
32
1
Q12
3
2
1
3
2
1
Q11
D7
R22
1K,1/16W
R21
200,1/16W
R37
23.2K,1/16W
R38
10K,1/16W
R36 2K,1/16W
ZD9
8 7 6 5
1 2 3 4
Cd Si V+ INV
Cs
Es
Ct
GND
IC5
C14 330p,50V
C13 0.1µ, 25V
Q2
Q10
32
1
3
12
R20 1K,1/16W
R19
10K,1/16W
VH-ON
<03-B8>
<05-F5>
<03-B8 > <03-F1>
<02-F1> <05-F5> <05-F1>
R28 51,1/10W
Q8
12
3
OP-Vcc
C18
470µ,35V
R29
10K,1/16W
OP-VH
R30
2.7K,1/16W
Q18
2
1
3
EMI
FB1
EMI
FB2
C82 0.01µ,50V
C81 0.01µ,50V
1 2 3 4
8 7 6 5
CS ES CT GND
CD
SI
V+
INV
IC2
Q3 2
1
3
C10
0.1µ,25V
ZD4
CHG-ON
<02-F3>
R44 47K,1/16W
R117
0,1A C9
2.2µ,16V
D1
R10
0.13,1/4 R11
0.13,1/4
D6
ICP2
R12
7.5K,1/16W
R13
7.5K,1/16W IC3
Vpp
R14
300K,1/16W
R15
300K,1/16W
C11 0.1µ,25V CHGLEV <03-G5>
Vpp
R35 47K,1/16W R34 22K,1/16W
Vcc1
R32
100K,1/16W
R33 47K,1/16W
R17
23.2K,1/16W
R18
10K,1/16W
ZD5
R16
2K,1/16W
BATLEV <03-F1>
CNBT2
2 1EMI
FB5 R31
7.5K,1/16W
Vcc1
ZD6
D10
R114
2.2K,1/16W
R115
1.5K,1/16W
R39
1K,1/16W
D13
D15
THBAT <03-G5>
PWRON <04-D8>
BAT-ON <02-A3>
1 3 2
CNDC1
Q1
5
67
8 4
IC3
3
21
8 4
+
–
T
C
Q19 2
1
3
4
6578
213
R6 220,1/4W
<04-E7>
OP-ON <04-F7>
BTC
ZD7
Q26
3
12
Vcc4
R71
47K,1/16W
V4-OFF <03-B8>
R73 10K,1/16W
C64 0.01µ,50V
R72 1K,1/16W
R78 47K,1/16W
<03-E8>

18
12345678910
A B
C D
E
F
G
CONTROL PCB ASS'Y 02
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
VH
VH
Vcc4Vcc4
Vcc2
Vcc4 Vcc4Vcc4Vcc4
Vcc1
Vcc1
16
10
MD <15..0> MA <9..0>
PULLUP
C83
0.01µ,50V 0
1 2 3 4 5 6 7
9 0 1 2
15 14 13 12 11 10
9 8
8 7 6 5 4
LCAS UCAS OE
RESET
<01-B10>
<03-E1> <03-E1>
<03-D4>
<03-D1> <03-D1>
<03-B1>
<03-B1>
R43 1M,1/16W
R42
100,1/16W
X2 48MHz
C31
3p,50V
3VDD 5VDD MD0 MD1 MD2 MD3 MD4 MD5 MD6 MD7 UW RAS MA9 MA0 MA1 MA2 LW PLUG PULUP USBD USBD 3VDD VSS MA3 MD15 MD14 MD13 MD12 MD11 MD10 MD9 MD8 LCAS UCAS OE MA8 MA7 MA6 MA5 MA4 LPA2 RES 5VDD 3VDD
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
VSS
VSS
5VDD
TEST
LXI
LXO
MTEST
LPA3
SNMI
NMIO
LPB3
LPB2
LPB1
LPB0
CSSEL
LPA6
LPA5
LPA4
IRRXD
FIRRXD
IRTXD
VSS
5VDD
SELIN
INIT
AFXT
FAULT
SLCT
PE
BUSY
ACK
IFD7
IFD6
IFD5
IFD4
IFD3
IFD2
IFD1
IFD0
STB
VSS
5VDD
VSS
VSS
<04-F8>
<04-C8>
<04-B8>
<04-C8>
<04-B8>
<04-E8>
<04-D8>
C89 0.01µ,50V
CC-SW
RCV-SW
BZOUT
CHG-ON
PW-LED
ERR-LED
BATT-LED
C90 0.01µ,50V
132 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89
ASIC
IC6 15
14 13 12 11 10
9 8 7 6 5 4 3 2 1 0
16 D <15..0> <03-B1>
<03-B1>
20
C93 0.01µ, 50V
176
175
174
173
172
171
170
169
168
167
166
165
164
163
162
161
160
159
158
157
156
155
154
153
152
151
150
149
148
147
146
145
144
143
142
141
140
139
138
137
136
135
134
133
VSS
VSS
5VDD
HCONT
HCLK
HDATA
HLAT
BENB3
BENB2
BENB1
ODENB
EVENB
HENB3
HENB2
HENB1
HENB0
MCHE1
MCHE0
WHEAT
HDRES
IFSEL
LPA0
LPA1
WAIT
INT0
INT1
INT2
INT3
CS0
CS1
D0
D1
D2
D3
D4
TEST2
SXIN
SXOUT
SXO
SXI
TEST1
5VDD
VSS
VSS
<05-F1>
<05-E1>
<05-E1>
<03-A1>
A <20..1>
R48
3.9K,1/4
R47
2.7K,1/16W
Q20
3
2 1
R50 330K,1/16W R49
1K,1/16W
MCH0 MCH1 W-HT
<05-E5> <05-E5>
R57 10K,1/16W
R58
10K,1/16W
C38 1µ,50V
CNH1
DA2
HZM6.8FA
DA2
HZM6.8FA
DA3
HZM6.8FA
DA3
HZM6.8FA
DA4
HZM6.8FA
DA4
HZM6.8FA
DA5
HZM6.8FA
DA5
HZM6.8FA
DA6
HZM6.8FA
DA6
HZM6.8FA
43
2
51
2
34
2
15
2
43
2
51
2
43
2
51
2
43
2
51
2
R59 470K, 1/10W R62
100K, 1/16W
R64 100, 1/16W
76
5
4 812
3
4 8
R60
33K,
1/16W
R61
12K,
1/16W R63
100K,1/16W
R65 180K,1/16W
C42
0.01µ,50V R66
7.5K,1/16W R67
1K,1/16W
VHG VHG MCH0 MCH1 HVH HVH TOP DIA ID0 ID1 INKS2 HVSS HENBA EVENENB HENBB HENBD ODDENB BENB0 BENB1 BENB2 HVDD HCLOCK HLATCH HRES HENBC HDATA DIK
IC7IC7
MCHE1
MCHE0
WHEAT
W-HT INKS1
<05-E5>
FB
FB
FB3
FB4
C8 0.1µ,25V
<01-C1>
HRANK
<03-G1>
HDIS
<03-F1>
1 2 3 4
8 7 6 5
1 2 3 4
8 7 6 5
1 2 3 4
8 7 6 5
Vcc4
R84 10K,1/16W
ID0
<03-D7>
HCLK HDATA BENB2 BENB1 ODDENB HCONT HLAT BENB3 HRES EVENB HENBC HENBB HENBA HENBD
RA1
RA2
RA3
3Vcc
C84
0.01µ,50V
Vcc1
UW
RAS
USBD+
USBD-
PLUG
< 04-B2 >
C85
0.01µ,50V
Vcc1
3Vcc 3
<05-F1> V3-ON
C86 0.01µ,50V
3Vcc
C87 0.01µ,50V
Vcc1
C88 0.01µ,50V
L4
C32
1000p,50V
MODE
NMI
C45 100p,50V
FNMI
CP5
RXD
<04-F8> FRXD
TXD
<04-F8 >
<04-F8>
C91 0.01µ,50V
C92 0.01µ,50V
3Vcc
Vcc1
<03-A1>
RD
WR
HWR
0
1
2
3
4
3Vcc
23 22 21 20 19 18 17 16
5 6 7 6 9
10
11
12 13 14 15
C95 0.01µ, 50V
3Vcc
C94 0.01µ, 50V
Vcc1
3VDD 5VDD
D5 D6 D7 D8 D9
D10
D11
D12 D13 D14 D15
A23 A22 A21 A20 A19 A18 A17 A16
VSS
3VDD
A15 A14 A13 A12
A11
A10
A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
RD
WR
HWR
5VDD 3VDD
C97
0.01µ,50V
Vcc1
BAT-ON <01-G3>
V2-ON <05-F1>
MTSTB <05-C1>
WAIT <03-E8>
INT4 <03-F8>
INT5
INT6
INT7
CE1
SXOUT <03-E8>
FB
FB6
C29
8p,50V
R41 1M,1/16W
R40
100,1/16W
X1 23.04MHz
C28
8p,50V
C96 0.01µ, 50V
Vcc1
1 2 3 4
8 7 6 5
RA8
CP4
RA4
Vcc3
RA5RA6RA7
R70
47K,1/16W
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
< 04-B2 > < 04-B2 > < 04-B2 >
CP3
<03-C7>
<04-C8>
<03-B8>
<03-E1>
<03-F9>
<03-F9>
<03-F9>
ID1
<03-D7>
Vcc4
R83 10K,1/16W
R68
47K,
1/16W
<03-E8>