Canon PH-72 User manual

SERVICE MANUAL
PARTS CATALOG
REVISION 0
COPYRIGHT 1999 CANON INC. CANON PAPER HANDLING CONTROLLER PH-72 REV. 0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
RY8-1397-000
JAN. 1999
PAPER HANDLING
CONTROLLER

COPYRIGHT ©1999 CANON INC.
Printed in Japan
Imprimé au Japon
Use of this manual should be
strictly supervised to avoid
disclosure of confidential
information.
Prepared by
PERIPHERAL PRODUCTS QUALITY PLANNING DIV.
PERIPHERAL PRODUCTS TECHNICAL DOCUMENTATION DEPT.
CANON INC.
5-1 Hakusan 7-chome, Toride-City, Ibaraki-Pref.,302-8501 Japan

PREFACE
This Service Manual contains basic information required for after-sales service of Paper
Handling Controller PH-72. This information is vital to the service technician in maintaining
the high quality and performance of the controller.
This manual consists of the following chapters:
Chapter 1: Product information
Features, specifications and basic operation
Chapter 2: The Mechanical System
Installation procedure and malfunction troubleshooting
Chapter 3: Parts Catalog
Paper handling controller PCB assembly
Appendix: Paper handling controller circuit diagram
Information in this manual is subject to change as the product is improved or redesigned.
All relevant information in such cases will be supplied in Service Information Bulletins.
A thorough understanding of this controller, based on information in this Manual and Service
Information Bulletins is required for maintaining its performance and for locating and repairing
malfunctions.

DTP system
This manual was produced on an Apple PowerMacintosh 9500/200 personal computer and output by an
Apple LaserWriter 16/600 PS laser beam printer; final pages were printed on AGFA Selectset avantra 25.
All graphics were produced with Macromedia FreeHand (E), and all documents and page layouts were
created with QuarkXPress (E).
The video images were captured with SONY degital video camcorder and Radius Photo DV capture
board, and modified with Adobe Photoshop(J).

CONTENTS
CHAPTER 1 PRODUCT INFORMATION
I. FEATURES ............................. 1-1
II. SPECIFICATIONS.................... 1-2
A. Paper Handling Controller . 1-2
B. Interface Connector
Locations .......................... 1-2
C. System Block Diagram....... 1-3
D. Interface Connector .......... 1-4
III. BASIC OPERATION ................. 1-6
A. Outline.............................. 1-6
B. Operations by Block .......... 1-7
C. Operation Outline.............. 1-8
CHAPTER 2 THE MECHANICAL SYSTEM
CHAPTER 3 PARTS CATALOG
I. INSTALLATION PROCEDURE .. 2-1
II. MALFUNCTION
TROUBLESHOOTING .............. 2-3
A. Initial Check ..................... 2-3
B. Malfunction
Troubleshooting ................ 2-3
I. PAPER HANDLING CONTROLLER
PCB ASSEMBLY...................... 3-1
APPENDIX
I. PAPER HANDLING CONTROLLER
CIRCUIT DIAGRAM................. A-1

CHAPTER 1
PRODUCT INFORMATION
I. FEATURES ............................. 1-1
II. SPECIFICATIONS.................... 1-2
III. BASIC OPERATION ................. 1-6

I. FEATURES
1. Option I/O device connection
By installing the Paper Handling Controller in the printer, connections with optional input
devices (high capacity decks with multiple decks of up to 10 decks with a maximum capacity of
6300 pages) and optional output devices (sorters and staple stackers with a maximum of 63
bins) are made possible.
2. Wide range of options capability
By installing the Paper Handling Controller in the printer, a maximum of 5 optional I/O devices
can be connected.
1 - 1
CHAPTER 1

II. SPECIFICATIONS
A. Paper Handling Controller
1) CPU NEC UPD784020GC-3B9
Memory (RAM) 512 bytes
Frequency 25 MHz
2) EPROM TEXAS INSTRUMENTS TMS27C512-12JL
64K bytes
3) SRAM TOSHIBA TC55257DFL-70L
32K bytes
B. Interface Connector Locations
Figure 1-2-1
1 - 2
CHAPTER 1
Paper Handling Controller I/F
Paper Handling Controller Optional input/output device I/F

C. System Block Diagram
Figure 1-2-2
1 - 3
CHAPTER 1
Paper Handling
Controller PCB
DC Controller
PCB
Video Controller
PCB
Optional input/output
device I/F
Paper Handling
Controller I/F
Video Interface
PCB
External device (host computer,etc.)
External Video I/F
Internal Video I/F
Printer
Optional
input/output
driver PCB
Optional input/output
device

D. Interface Connector
1. Paper Handling Controller Interface
Table 1-2-1 outlines the connectors and signals which connect the Paper Handling Controller
and Video Controller.
Table 1-2-1
1 - 4
CHAPTER 1
A1
B1
A10
B10
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
Abbreviation
+5V
RESET
/PRINT
/SPCHG
/PDLV
/undetermined 1
N.C.
/CKEN
/TX
GND
+5V
N.C.
/VSYNC
/PFED
RETURN-BACK (GND)
/undetermined 2
/STROBE
/RX
/CLK
GND
Signal
Reset signal (unused)
Print signal (unused)
Speed change signal (unused)
Paper delivery signal
For expansion
Communication ready signal
Send data line
Vertical synchronized request signal
Paper feed signal
Connection confirmation
For expansion
Strobe signal
Receive data line
Synchronized clock signal
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Output
Output
Input/
Output
Pin

2. Optional I/O Device Interface
Table 1-2-2 outlines the connectors and signals which connect the Paper Handling Controller
and optional I/O devices.
Table 1-2-2
1 - 5
CHAPTER 1
1
2
3
4
5
11
12
13
14
15
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
/TX
GND
/RX
/TERMINATE
+24V
/CLOCK
GND
GND
GND (KEY)
+24V
GND
/STROBE
PWRON
GND
+24V
Output
Input
Input
Output
Output
Output
Signal
Abbreviation
Send data line
Receive data line
Communication ready signal
Synchronized clock signal
Mis-insertion prevention
Strobe signal
Power ON signal
Input/
Output
Pin

III. BASIC OPERATION
A. Outline
To install an optional I/O device into the printer, the Paper Handling Controller must first be
attached to the printer. The Paper Handling Controller uses an 16 bit micro computer (IC101)
that controls serial communication with the Video Controller and serial communication with
optional I/O devices. The Paper Handling Controller controls up to 5 optional I/O devices simul-
taneously according to the various commands and signals sent from the Video Controller and
signals sent from the DC Controller.
Figure 1-3-1
1 - 6
CHAPTER 1
IC101
Serial communication
Printer
Paper Handling
Controller PCB
DC Controller
PCB
Optional input/output
driver PCB
Option 1
Option 2
Option 5
Serial communication
Video Controller
PCB External device
Paper Handling Controller I/F
Optional input/output device I/F
Serial communication
Serial communication
Optional input/output
driver PCB
Optional input/output
driver PCB

B. Operations by Block
1. CPU (IC101)
An NEC 1 chip micro computer (UPD784020GC-3B9) is used. The CPU communicates with the
Video Controller and optional I/O driver, and controls the optional I/O devices.
2. EP-ROM (IC109)
The EP-ROM has a 64K byte memory capacity, and contains the optional I/O device's operation
control program.
3. S-RAM (IC110)
The S-RAM has a memory capacity of 32K bytes. The S-RAM contains communication data
(maximum of 40 pages) between the Video Controller and the optional I/O devices.
Figure 1-3-2
1 - 7
CHAPTER 1
IC101
CPU IC110
S-RAM
IC109
EP-ROM
J102
J101
BUS
I/O
I/O
Optional I/O
devices Video
Controller

C. Operation Outline
Figure 1-3-3
The Video Controller supplies a +5V power supply to the Paper Handling Controller when the
printer power is turned ON, and communication commences after a specified period of time.
The microcomputer (CPU) on the Paper Handling Controller sends a POWER ON (PWRON) sig-
nal to the optional I/O device, turning the optional I/O device's power ON. Following this, the
Paper Handling Controller and optional I/O device commence serial communication.
The Paper Handling Controller sends pick-up and delivery command data for each page print-
ed to the optional I/O device based on data and the VERTICAL SYNCHRONIZED signal
(/VSYNC) from the Video Controller along with PAPER FEED (/PFED) and PAPER DELIVERY
(/PDLV) signals output from the DC Controller. The optional I/O device then returns its paper
feed status back to the Paper Handling Controller.
The S-RAM (IC110) constantly stores the latest 40 pages of communication data allowing the
CPU to control the optional I/O paper feed in real time for each page printed. `The Video
Controller monitors the paper feed status of the optional I/O device in real time by obtaining S-
RAM information via the Paper Handling Controller interface.
1 - 8
CHAPTER 1
+5V
/VSYNC
/PDLV
/PFED
CPU
(IC101)
PWRON
RERURN-
BACK (GND)
GND
S-RAM
(IC110)
GND GND
PWRON
Paper Handling
Controller PCB
Optional
input/output device
driver PCB
Serial
communication
Video
Controller
PCB
DC
Controller
PCB
Serial
communication Serial communication
Optional
input/output device
driver PCB

CHAPTER 2
THE MECHANICAL SYSTEM
This chapter describes the installation and troubleshooting procedures of the paper handling
controller. Note the following precautions during installation and removal.
1. CAUTION: Before servicing the paper handling controller, disconnect the printer
power coad from the electrical outlet.
2. Installation is the reverse of removal unless otherwise specified.
3. Note the lengths, diameters, and locations of screws as you remove them. When installing the
paper handling controller, be sure to use them in their original locations.
4. Discharge electrical static from your body by touching the metal frame of the printer prior
to installing the paper handling controller in order to avoid any static charge causing
damage.
I. INSTALLATION PROCEDURE .. 2-1 II. MALFUNCTION
TROUBLESHOOTING .............. 2-3

I. INSTALLATION
PROCEDURE
1) The Paper Handling Controller is
installed in the slot on the right side of
your printer’s motherboad, when facing
the rear of the motherboad, as shown
below.
Figure 2-1-1
2) Place the motherboad on a flat surface
and remove the cover with a screwdriv-
er ➀ ➁.
Figure 2-1-2
3) Press down on the connector and insert
the protruding part of the controller
boad into the slot, as shown below.
Figure 2-1-3
4) Attach the cable by pressing the con-
nector into the slot at the rear of the
Paper Handling Controller.
Figure 2-1-4
2 - 1
CHAPTER 2
➀
➁

5) Press down on the connector and tight-
en the screws to fix the boad in place.
Figure 2-1-5
2 - 2
CHAPTER 2