Canon NP-70 User manual

CANON SERVICE MANUAL
NP•70
Total
Guaranty
System
L
c
CANON INC.

CANON SERVICE MANUAL
NP•70
CANON
INC.

PREFACE
This manual is
published for use
by
service
technicians when servicing the
Canon
NP
-70 photo-
copier. It is recommended
that
the
service technician use
this
manual
in confunction with
the
NP
-70
Parts Catalog, the NP
-70 Service Handbook
and
other
related publications when
performing his main-
tenance
work. The use of all NP
-70
—related publications will ensure that the repairman
retains his
familiarity with all
changes, and will enhance
his overall knowledge of the NP
-70.
The first and
second chapters of this manual are
introductory in nature. They
stress, respectively,
operator &process
familiarity and
generalized machine operation. These
two chapters are also useful
for training
or promotional
purposes.
The remaining
chapters are each
specific in nature
and
form
the bulk
of
the publication. When
working on
the NP -1100,
frequent reference to these
chapters will ensure that all
adjustments, proce-
dures, tolerances,
etc. are
satisfied. Also, for the convenience of
the service technician,
circuit diagrams
and layouts have been
appended in the rear of the manual.
This service manual
is written
with the intent that it be
applicable to all NP
-70 copiers, regardless
of
product number.
Thus,
any
section which
deals
with
a specific
product numbers) is
identified.
This
manual
contains information
to perform servicing on
the following NP -70
photocopiers:
~`"''
~~~
Prod.
No.
Input
Voltage
General
Destination
Manufacturing
Location
3 ~
~ ~
8-11154 230VAC ±
10% (SOHz)
NOTE: Switch
built-in for using
at
220VAC &
240VAC
Europe
Japan
8-11155 Same as
8-11154
Europe, Africa,
Middle
East
Germany
8-11156
100VAC ± 10%
(SOHz)
Universal
with
adapter
pedestal
Japan
8-11157
100VAC ± 10%
(60Hz)
Universal with
adapter
pedestal
Japan
8-11158
230VAC ± 10% (SOHz)
South East
Asia
South America
Central
America
Japan
8-11184
240VAC ± 10% (SOHz)
Australia
Japan
~ ~~~
We
welcome
your comments
on the
contents
of
this
NP -70
Service
Manual.
Canon
Inc.
Business
Machines Service
Division
Electrostatic
Photocopiers
Technical
Support
Section
©
CANON
INC.

POINT OF
DIFFERENCE
This table
shows the point of
difference
between Second
Printing and Third
Printing
Page
First Printing
Change
Addition
Second Printing
2-10
O
40
Sprocket
3-8
40 RSW
Multiple - -
-Switch
O
deletion
4-19 1) a) - - - ,the
Illumination
Assembly
and the
O
,the
right upper
2)
ADJUSTMENTS
The
width of
the aperture
slit - - - -adjustable
mask blades
mask
blades (see Fig. 4-24).
O
ADJUSTMENTS
The adjustment of - - - -
(see Fig. 4-24).
a)
b)
423 in
Fig. 4-28
Flange
(rear)
O
Flange (front)
O [NOTICE]
PROCEDURES - -- -
DRUM CYLINDER
4-24
4.5-1
1)
becomes approx.
+
1800 ±
100
volts.
becomes approx.
+
1800 ±
50 bolts.
4.5-2
Table 4-1 Corona
Wire
Specifications
Standard
High
16.5 ±
0.5 9.5 ±
0.5
Standard Hight about 16.5
(refer to
\Table )
about 9.5
(refer to
\Table )
4-26 2)
Perform the replacement
Assembly
as follows
O
Perform the
replacement
Assembly
an d Transfer Corona
Assembly
as follows
O
[Addition]
Paper
Guide Wire
Replacement
of Transfer
Corona Charge
4-51
4.9-1
The NP
-70 has four (4) - -- -
O
The
NP
-70 has s}x (6)
4-52 BS
97-5924 10.5
1.0
84.5
O O
BS
97-5925 10.5 1.0 84.5
Table
4-3
Letter
97-5924 10.0 1.0 79
Universal
97-5924
10.0
1.0
79
4-53
Table
4-4
O
Letter
400 ± 100 1200 ± 100
Universal 400 ± 100 1200 ± 100
[NOTICE]
1)
2)
O
©
CANON INC.

Page
First Printing
Change
Addition
Second
Printing
4-54
Fig.
4-58
'~
i
i~
Roller
Drive
~
Sprocket (A)
r~
~
Chain
Roller
Drive
Sprocket (B)
O
Roller Drive
Sprocket (A)
Roller Drive
Sprocket
i
Idler : ~
Sprocket ~
I,r'
Ladder
~~
Ladder
Chain
Roller Drive
Sprocket (B)
(A)
4-63
Fig.4-71
Tension
Sprocket
A
O
Tension Sprocket
A
/O
O
O
O
_
~
~`
/O
O
~-
O
~`~
O O
Tension
Sprocket B
Chain
Drive
Sprocket
Chain
Drive S
rocket
P
4-71
Fig.4-83
Up -down Actuation
Lever O
Up -down
Actuation
4-104 d) in the rest button
(and
the arm tripping
the micro-
switches)
moving upward.
in the rest button is
pushed up by
the lever and the
arm
tripping
the micro -
switches
move upward.
B-4 A.
T. R. Circuit
O
C-3
O
NFB4
X62-1047
125
VAC
NFB4 X62-1074
250 VAC
C-7 R131
R132
R133
O
deletion
©
CANON
INC.

TABLE
OF
CONTENTS
1 GUIDE TO THE NP
-70
1.1 FEATURES
OF
THE
NP
-70 COPIER
1.2
APPEARANCE
1.3 SPECIFICATIONS
1—
1
1—
2
1— 4
1.3-1 Performance Specifications
1— 4
1.3-2 Physical Specifications
1— 4
1.3-3 Paper
Specifications
1— 5
1.3-4
Colors
of
Paper Available
from
Canon
1—
5
1.4 OPERATING PROCEDURES
1— 6
1.4-1 Preparation
1— 6
1.4-2 Placing of Original
1— 6
1.4-3 Loading
of
Paper
1— 6
1.4-4
Copying Operations
1— 6
1.4-5 Image
Density 1— 7
1.4-6 Handling of Paper &Loading
of
Paper Cassette
1—
7
1.5
IMAGE
FORMING
PROCESS OF
THE
NP -70
1— 8
2 OUTLINE OF NP -70 OPERATION
2.1
BREAKDOWN OF THE NP -70 2— 1
2.2
PARTS
NOMENCLATURE 2— 3
2.3
OUTLINE OF MAIN ASSEMBLIES
2—
5
2.3-1 Copyboard Assembly
2—
5
2.3-2 Illumination Assembly
2— 5
2.3-3
Optical
Assembly 2— 5
2.3-4 Drum Assembly
2— 5
2.3-5
Corona Assemblies
2—
5
2.3-6 Developer Assembly
2—
6
2.3-7 Drum Cleaner
Assembly
2— 6
2.3-8
Cassette
and
Cassette
Holder Assemblies
2— 6
2.3-9 Paper Pickup Roller
Assembly
2— 7
2.3-10 Copy
Conveying Assembly
2— 7
2.3-11 Heater
Assembly
2— 7
2.3-12 Blowers and Fans
2— 7
2.3-13 Copy
Selector Subassembly 2— 7
2.3-14
Safety
Assembly
2— 7
© CANON
INC.

2.3-15 Copyboard
Driving Mechanism Assembly 2—
8
2.3-16
Pedestal Assembly
2—
8
2.4 OUTLINE OF THE
DRIVE SYSTEM
2—
9
2.5 OUTLINE OF
"ORIGINAL" MOVEMENT
2-12
2.6
OUTLINE OF COPY PAPER
MOVEMENT
2-13
3 ELECTRICAL
3.1
CIRCUIT
3.2 GENERAL
3.2-1
3.2-2
3.2-3
3.3 SIGNIFICANT
SYSTEM
DIAGRAM GRAPHIC
SYMBOLS
EXPLANATION OF CIRCUIT
OPERATION
3—
1
3— 9
3—
9
3-14
3-27
3-33
When Power is Turned
"ON" -
(START;
When Copies are
Desired -
(COPY
When Copy Paper Fails to Exit
the Copier (JAM
OPERATION TIMES
3.3-1 Heater Wait Time
3-33
3.3-2
Warm-up
Time
3-33
3.3-3
Prestart
for the First Feed
Interval
3-33
3.3-4
First Feed
Interval
3-34
3.3-5 Prestart Time
3-34
3.3-6
Copying Cycle
3-34
3.3-7
Second
Feed Interval
3-35
3.3-8 Neutral Time
3-35
3.3-9
STANDBY
3-35
3.4
OUTLINE OF
ELECTRICAL COMPONENTS AND
CIRCUITS.
3-39
3.4-1
Switchable Taps
for AC Line Voltage
Compensation
3-39
3.4-2 AC Line Voltage
Filter
3-39
3.4-3
Rectification Circuit Card
3-39
3.4-4 "Rapid
-Start"
Illumination Circuit
3-40
3.4-5 Heater
Wait
Control
Circuit
3-41
3.4-6 Developer Monitoring Circuitry
3-47
3.4-7 Developer Temperature
Control
Circuit
3-49
3.4-8 Paper
Cassette
Monitoring Circuitry
3-51
3.4-9 Heater Control Circuit
3-54
3.4-10 Heater Control Circuit - "Zero -Cross"
3-59
3.4-11 Voltage Adapter Pedestal
3-64
4
MECHANICAL SYSTEM
4.1
COPYBOARD ASSEMBLY
4—
1
©
CANON INC.-

4.1-1
Outline
of
Assembly Operation
4- 1
4.1-2
Assembly Main Components
4- 1
4.1-3
Removal/Installation Actions
4- 5
4.1-4
Repair/Servicing Actions
4- 7
4.2 ILLUMINATION ASSEMBLY
4-
9
4.2-1 Outline of
Assembly
Operation
4-
9
4.2-2 Assembly
Main Components
4-
9
4.2-3
Removal/Installation Actions
4-11
4.2-4
Repair/Servicing Actions
4-12
4.3 OPTICAL ASSEMBLY
4-13
4.3-1 Outline of Assembly Operation
4-13
4.3-2 Assembly Main Components
4-14
4.3-3 Removal/Installation Actions
4-15
4.3-4
Repair/Servicing Actions
4-19
4.4 DRUM ASSEMBLY
4-20
4.4-1 Outline of Assembly Operation
4-20
4.4-2 Assembly Main Components
4-20
4.4-3
Removal/Installation Actions
4-22
4.4-4 Repair/Servicing Actions
4-23
4.5
CORONA ASSEMBLIES 4-24
4.5-1
Outline of Assembly
Operation
4-24
4.5-2 Assembly Main
Components
4-24
4.5-3 Removal/Installation
Actions
4-25
4.5-4 Repair/Servicing Actions
4-29
4.6
DEVELOPER ASSEMBLY
4-30
4.6-1 Outline
of Assembly
Operation
4-30
4.6-2
Assembly Main
Components
4-31
4.6-3
Removal/Installation
Actions
4-39
4.6-4 Repair/Servicing
Actions 4-41
4.7
DRUM
CLEANER
ASSEMBLY
4-44
4.7-1
Outline of Assembly
Operation
4-44
4.7-2
Assembly Main
Components
4-44
4.7-3
Removal/Installation
Actions
4-46
4.7-4
Repair/Servicing Actions
4-46
4.8
CASSETTE HOLDER
ASSEMBLY
4-49
4.8-1 Outline
of Assembly
Operation
4-49
4.8-2
Assembly Main
Components
4-49
4.8-3
Removal/Installation Actions
4-50
©
CANON
INC_

4.8-4 Repair/Servicing Actions
4-50
4.9
PAPER CASSETTE ASSEMBLIES
4-51
4.9-1 Outline
of Assembly Operation
4-51
4.9-2
Assembly Main Components
4-51
4.9-3
Removal/Installation Actions
4-52
4.9-4 Repair/Servicing Actions
4-52
4.10
PAPER PICKUP ROLLER
ASSEMBLY (w/
CONTROLER ASSEMBLY)
4-54
4.10-1 Outline
of Assembly Operation
4-54
4.10-2 Assembly Main Components
4-62
4.10-3 Removal/Installation Actions
4-63
4.10-4 Repair/Servicing Actions
4-64
4.11 COPY CONVEYING ASSEMBLY
4-73
4.11-1
Outline
of
Assembly
Operation
4-73
4.11-2 Assembly Main Components
4-73
4.1 1-3 Removal/Installation Actions 4-76
4.1 1-4 Repair/Servicing Actions
4-78
4.12
PAPER SEPARATING
SUBASSEMBLY
4-81
4.12-1 Outline
of Assembly Operation
4-81
4.12-2 Assembly
Main
Components
4-82
4.12-3 Removal/Installation
Actions
4-83
4.12-4 Repair/Servicing
Axtions
4-84
4.13 HEATER ASSEMBLY
4-85
4.13-1
Outline
of Assembly
Operation
4-85
4.13-2 Assembly Main Components
4-86
4.13-3 Removal/Installation Actions
4-87
4.13-4 Repair/Servicing Actions
4-87
4.14 BLOWER &FAN ASSEMBLIES
4-88
4.14-1
Outline
of Assembly
Operation
4-88
4.14-2 Assembly Main Components
4-88
4.14-3 Removal/Installation Actions
4-90
4.14-4
Repair/Servicing Actions
4-90
4.15
COPY SELECTOR SUBASSEMBLY
4-92
4.15-1 Outline of Assembly Operation
4-92
4.15-2 Assembly Main
Components
4-92
4.15-3
Removal/Installation
Actions
4-96
4.15-4
Repair/Servicing Actions
4-97
4.1.6 SAFETY
ASSEMBLY
4-
99
©
CANON
INC.

4.16-1
Outline of
Assembly
Operation
4.16-2
Assembly
Main
Components
4.16-3
Removal/Installation
Actions
4.16-4
Repair/Servicing
Actions
4—
99
4—
99
4-104
4-104
4.17
COPYBOARD
DRIVING
MECHANISM
ASSEMBLY
4-106
4.17-1
Outline of
Assembly
Operation
4-106
4.17-2
Assembly
Main
Components
4-108
4.17-3
Removal/Installation
Actions
4-112
4.17-4
Repair/Servicing
Actions
4-112
APPENDIX A
(COPIER
-GENERAL)
Microswitch
Timing
Chart,
All Copiers
A-1
Photocopier
Schematic
Diagram,
Prod. No.
8-1
11 54/5 5 A-2
Photocopier
Schematic
Diagram,
Prod.
No.
8-11156/57
A-3
Photocopier Schematic
Diagram,
Prod.
No.
8-11158/84
A-4
Photocopier
Wiring Diagram,
Prod. No.
8-11154/55
(1
of 2)
A-5
Photocopier
Wiring Diagram,
Prod. No.
8-1 11
54/55
(2 of
2)
A-6
Photocopier
Wiring Diagram,
Prod. No.
8-11156/57
A-7
Photocopier Wiring
Diagram,
Prod.
No.
8-1 1 1
58/84
A-8
APPENDIX B
(SPECIFIC
CIRCUITS)
Heater
Control
Circuit
Schematic
Diagrams
B-1
Printed
-Circuit
Board Layouts
(1
of
3)
B-2
Printed
-Circuit
Board
Layouts
(2 of 3)
B-3
Printed
-Circuit Board
Layouts (3
of
3)
B-4
APPENDIX C
(ELECTRICAL PARTS)
Parts
List
-Copier
Common
Components
C-1
Parts List
-Product
Number
Distinctive
Components
C-7
Parts
List
-Heater
Control
Circuits
C-9
LIST OF
ILLUSTRATIONS
Fig. 1-1
General View
of
the NP -70
1—
2
Fig.
1-2 Control Panel
1—
3
Fig.
1-3 Original Positioning on Copyboard
1
5
Fig. 2-1 Breakdown of
the
NP -70
2—
1
Fig.
2-2
NP
-70 Parts Nomenclature
2— 3
©
CANON INC.