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.

r
Fig. 2-3
Fig. 2-4
Fig. 2-5
Fig. 2-6
Fig. 2-7
Fig. 2-8
Fig. 2-9
Fig. 3-1
Fig. 3-2
Fig. 3-3
Fig. 3-4
Fig. 3-5
Fig.
3-6
Fig. 3-7
Fig. 3-8
Fig. 3-9
Fig. 3-10
Fig. 3-11
Fig. 3-12
Fig. 3-13
Fig. 3-14
Fig. 3-15
Fig. 3-16
Fig. 3-17
Fig. 3-18
Fig.
3-19
Fig.
3-20
Fig.
3-21
Fig. 3-22
Fig. 3-23
Fig. 3-24
Fig. 3-25
Fig. 3-26
Fig. 4-1
Fig. 4-2
Fig. 4-3
Fig. 4-4
Fig. 4-5
Fig.
4-6
Fig. 4-7
General Diagram of the Drive System
2— 9
Components
of
the Drive
System
2-10
Block Diagram of the Drive System
2-1 1
Movement of the Original
2-12
Movement
of
Copy Paper
2-13
Conveying
Drive Mechanism
2-14
Diagram
of
Copy Paper Movement
2-15
(STARTS Flowchart
3-12
(COPY) Flowchart
3-21
(JAM)
Flowchart
3-31
Significant Operation Times
3-37
Low -Pass Filter
-Schematic
Diagram
3-39
Voltage Regulator -Typical
3-39
Voltage Regulator
3-40
Original Illumination Circuit
3-41
Heater Wait Control
Circuit &Associated
Components
3-42
"Heater Wait" Flowchart
3-45
Developer
Monitoring Circuitry
3-47
"Toner Feed"
Flowchart
3-48
"Developer Low"
Flowchart
3-48
Developer
Temperature Control Circuit &Associated Components
3-49
Developer
Cooling Flowchart
3-50
Paper Cassette Monitoring
Circuitry
3-51
"Cassette
Empty" Flowchart
3-52
"Cassette Not Seated" Flowchart
3-53
Heater Control
Circuit &Associated Components
3-54
Heater Operation
Flowchart
3-57
"Zero
-Cross" Heater
Con. Ckt.
&Associated
Components
3-59
1/4
Zero -Cross
Circuit
3-60
1/4
"Zero
-Cross" Waveforms
1 / 1
Zero -Cross Circuit
1/1
"Zero -Cross" Waveforms
Voltage Adapter Pedestal -Schematic
3-61
3-62
3-63
Diagram
3-64
Copyboard Assembly Main Components
4— 1
Front
Rail Components 4_
2
Rear
Rail
Components
4—
3
Roller Unit Positioning
4— 4
Copyboard Wire Installation (A)
4—
5
Copyboard Wire Installation
(B)
4—
6
Copyboard Wire Installation (C)
4—
6
© CANON
INC.

Fig.
4-8
Copyboard Wire Installation
(D)
4—
6
Fig. 49
Measuring of Wire Tension
4—
7
Fig. 4-10
Wire Tension
Adjustment
4— 7
Fig. 411
Location of Paper
Feed
Cam
4—
8
Fig.
4-12
Paper
Feed
Cam
Adjustment
4— 8
Fig. 4-13
Illumination Assembly Main
Components
4—
9
Fig. 4-14 Lamp
Illumination Pattern
4-10
Fig. 415
Electromagnetic
Field
Radiator
Mounting
4-10
Fig.
4-16 Removal of Lamps
4-11
Fig. 417
Block Diagram
of
Light
Travel
4-13
Fig. 4-18 Optical
Assembly Main Components
4-14
Fig. 4-19
Exposure Mask
Removal
4-15
Fig. 4-20
Adjust
Line
Replacement (A)
4-17
Fig. 4-21
Adjust
Line
Replacement (B)
4-17
Fig. 4-22
Adjust Line Replacement (C)
4-18
Fig. 4-23
Adjust Line Replacement (D)
4-18
Fig. 4-24
Exposure Mask
Adjustment
4-19
Fig. 4-25
Drum Assembly Main Components
4-20
Fig. 4-26 Drum
Unit
4-21
Fig. 4-27 Drum Position
in Copier (from copier front) 4-22
Fig. 428
Drum Unit Reassembly 4-23
Fig.
4-29 Eliminator
Assembly Removal
4-25
Fig. 4-30 Paper Guide Wire
Replacement
4-26
Fig. 4-31 Corona Wire Loop
4-27
Fig. 4-32 Attaching Corona Wire
4-27
Fig.
433 Wiring Procedure
4-28
Fig.
4-34
Corona Wire Adjustment
(Positive Corona
Assembly
Illustrated)
4-29
Fig. 4-35
Developer Assembly Main
Components
4-31
Fig. 4-36
ATR Subassembly Main Components
4-32
Fig. 4-37 Developer Flow Through
ATR Subassembly
4-33
Fig. 4-38 Toner Density Monitoring
4-33
Fig.
4-39 Developing Tray Main
Components
4-33
Fig. 440
Squeezing Roller Main
Components
4-34
Fig. 4-41 Reservoir
Cover Components
(Underside View) 4-35
Fig.
4-42 Circulation of Developer in
the
NP
-70
4-36
Fig.
4-43 Replenishing Mechanism
Main Components
4-36
Fig.
4-44 Toner Replenishment
Actuation
4-37
Fig. 4-45 Normal
Developer Level
4-38
Fig. 4-46 Lowered
Level
4-38
Fig.
4-47 Reservoir
Cover (Underside View)
4-39
Fig.
448 Components
of
Squeezing
Roller (Detailed)
4-40
©
CANON
INC.

Fig.
4-49 Replenishment Lever Adjustment
4-41
Fig. 4-50
Squeezing Roller Adjustment
4-42
Fig.
4-51 Developer
Float Adjustment
4-43
Fig.
4-52 Drum
Cleaner Assembly Main Components (from Copier Front)
4-44
Fig.
4-53 Drum Cleaner Assembly Main
Components (Exploded View)
4-45
Fig. 4-54
Adjustment of Cleaner Blade Pressure (A)
4-47
Fig. 4-55
Adjustment of Cleaner Blade Pressure
(B)
4-47
Fig.
4-56 Cassette Holder Assembly Main Components
4-49
Fig. 4-57
Cassette Assembly Main
Components
4-51
Fig.
4-58 Pickup Roller Rotation Drive
4-54
Fig. 4-59
Roller Up -down Drive Components
4-55
Fig.
4-60 Pickup Roller Up -down Drive
4-56
Fig.
4-61 Timing Roller Drive
Components
4-56
Fig.
4-62 Controller Assembly Operation (A)
4-57
Fig.
4-63 Controller Assembly
Operation (B)
4-57
Fig.
4-64 Controller Assembly
Operation (C)
4-58
Fig.
4-65 Controller Assembly Operation (D)
4-58
Fig.
4-66
Controller
Assembly
Operation (E)
4-59
Fig.
4-67
Controller
Assembly
Operation (F)
4-59
Fig.
4-68
Controller
Assembly
Operation
(G)
4-60
Fig.
4-69
Paper
Pickup/Feeding
Operation
4-61
Fig. 4-70 Paper
Pickup Roller
Assembly
Main
Components
4-62
Fig. 4-71
Drive Chain Removal
4-63
Fig. 4-72 Timing
Roller Drive
Main Components
4-64
Fig.
4-73
Timing Roller
Drive Disassembly
(A)
4-65
Fig. 4-74 Timing Roller
Drive Disassembly (B)
4-65
Fig. 4-75 Paper Feed
Cam Drive Main
Components
4-66
Fig. 4-76 Paper Feed
Cam Drive
Disassembly (A)
4-67
Fig. 4-77 Paper Feed Cam
Drive
Disassembly
(B)
4-67
Fig. 4-78 Paper Feed Cam Drive
Disassembly (C)
4-68
Fig.
4-79 Paper Feed
Cam Drive
Disassembly (D)
4-68
Fig. 4-80
Controller Spacing
4-69
Fig. 4-81
Pickup
Roller Spacing
4-69
Fig. 4-82 Pickup Roller Height
4-70
Fig.
4-83 Pickup
Roller Height
Adjustment
4-71
Fig. 4-84 Paper Feed
Cam Drive Lubrication
4-71
Fig.
4-85 Timing
Roller Drive Lubrication
4-72
Fig. 4-86
Copy
Conveying
Assembly Main Components
4-73
Fig. 4-87 Upper
and
Lower Rollers
4-74
Fig.
4-88 Copy
Paper Guide
and
Jam Detection Lamp
4-75
Fig. 4-89 Partitioning Plate
4-75
© CANON
INC.

Fig. 4-90 Copy Conveying
Assembly
(from copier front)
4-76
Fig. 491 Pivot
Shaft Removal 4-77
Fig. 4-92
Copy
Paper
Guide Lacing
Pattern 4-78
Fig.
4-93 Correct
Chain
Positioning
4-79
Fig. 494 Partitioning Plate Height Adjustment
4-79
Fig.
4-95 Positions
of
Screws A and B
4-80
Fig. 4-96 Movement
of Separation Belt (from copier
rear)
4-81
Fig. 4-97 Paper Separating Subassembly Main Components
4-82
Fig. 4-98 Heater
Assembly Main Components
4-86
Fig. 4-99 Heater Element Types
4-86
Fig. 4-100 Suction Blower
Assembly Main Components
4-88
Fig. 4-101
Air
Input
Blower Assembly Main
Components
4-89
Fig. 4-102 Fan Assembly Main Components 4-89
Fig.
4-103 Blower Blade Drum Adjustment
4-91
Fig.
4-104
Copy
Selector Subassembly
Main Components
4-92
Fig. 4-105
Ratchet Wheel Position
4-93
Fig. 4-106 Copy Selector
Operation (A)
4-94
Fig.
4-107 Copy Selector
Operation (B)
4-94
Fig. 4-108 Copy Selector
Operation (C)
4-95
Fig. 4-109
Copy Selector
Operation (D)
4-95
Fig. 4-110
Stop Button Operation
4-96
Fig.
4-111 Drive and Link
Stud
Positioning
4—
96
Fig. 4-112 Copy Selector
Reassembly
4—
97
Fig. 4-113 Click and
Ratchet Wheel Positioning (Top View)
4—
98
Fig. 4-114 Safety Assembly Main
Components
4—
99
Fig. 4-115 Door
Switch Group Main
Components
4-100
Fig. 4116
Door Switch
Group
Operation (A)
4-101
Fig.
4-117 Door Switch Group
Operation (B)
4-101
Fig. 4-118 Door
Switch Group Operation (C)
4-102
Fig. 4-119 Door Switch Group
Operation (D)
4-102
Fig. 4-120 Jam Stop Group
Main Components
4-103
Fig. 4-121 Jam Stop Group
Operation (A)
4-103
Fig. 4122
Jam
Stop Group
Operation (B)
4-104
Fig. 4-123
Adjustment
of
Front Safety
Lever
4-105
Fig. 4-124 Jam Stop
Group Adjustments
4-105
Fig. 4-125
Driving Mechanism Operation (A)
4-106
Fig. 4-126
Driving Mechanism
Operation (B)
4-106
Fig.
4-127 Driving
Mechanism Operation
(C)
4-107
Fig.
4-128 Copyboard Reciprocation
Operation
4-108
Fig.
4-129 Copyboard
Driving
Mechanism Assembly
Main
Components
4-109
Fig. 4-130
Forward
Clutch &Associated
Components
4-110
©
CANON
INC.

Fig. 4-131
Return
Clutch
&Associated Components
4-111
Fig.
4-132 Copyboard Return Drive Flow Diagram
4-11 1
TABLES
Table 1-1
Performance Specifications
of
the
NP -70
1 —
4
Table
1-2 Physical Specifications of the
NP -70
1 —
4
Table 1-3 Standard
of Paper
Sizes
1 —
4
Table
3-1
Electrical Components
3 — 1
Table
3-2 Explanation of
~START~
Flowchart
3
—10
Table
3-3 Explanation of
~COPY~
Flowchart
3
—15
Table 3-4
Explanation of
~JAM~
Flowchart
3
—28
Table 3-5
Explanation of
"Heater Wait"
Flowchart
3 —43
Table 3-6 Explanation of
Heater Operation Flowchart
3 —
55
Table 3-7 Voltage Converter Specifications
3 —64
Table 4-1 Corona Wire
Specifications
4
—24
Table
4-2
Adjustment
Plate
Movement
4
—48
Table 4-3 Spring Specifications 4 —
52
Table
4-4
Spring
Pressure for
Cassette Assemblies
4 —
53
Table
4-5
Heater
Assembly Specifications 4 —
85
©
CANON
ANC.

CHAPTER1
Guide to the NP
-70
1.1 FEATURES OF THE NP -70 COPIER
1.2 APPEARANCE
1.3
SPECIFICATIONS
1.3-1
PERFORMANCE SPECIFICATIONS
1.3-2 PHYSICAL
SPECIFICATIONS
1.3-3
PAPER SPECIFICATIONS
1.3-4 COLORS
OF PAPER AVAILABLE FROM
CANON
1.4
OPERATING PROCEDURES
1.4-1 PREPARATION
1.4-2
PLACING
OF ORIGINAL
1.4-3
LOADING
OF PAPER
1.4-4
COPYING
OPERATIONS
1.4-5
IMAGE DENSITY
1.4-6 HANDLING OF PAPER &LOADING
OF PAPER
CASSETTE
1.5
IMAGE
FORMING
PROCESS OF
THE NP -70

NP•70 1-1
1.1 FEATURES OF THE NP -70 COPIER
The
NP -70
electrostatic
copier is a completely
new
type copying machine which
has been develop-
ed
by Canon technology.
This development
places
the
NP
-70 in a new category
-the "Liquid,
Plain -paper
-type
Electrostatic
Copier".
Due
to
the
adaptation of
the
liquid development method for
use
with
PPC-type copying, integra-
tion for
the
first
time anywhere
of
the following features outstanding for conventional dry electro-
static copiers has been achieved.
1)
LARGE COPY SIZE
OBTAINABLE
Obtainable copy sizes are
from
7-1/8" x 10-1/8" to
11-5/8" x
16-1/2"
(JIS BS to A3).
Plain
paper
copying
above
size
10-1/8" x 14-5/6"
(JIS B4)
is
realized in the
NP -70 for the first
time
ever.
NOTE:
The
size
mentioned
are
approximate inch
equivalents of Japan
Industrial Standard
(JIS) sizes. Refer to the
specification
section
for
exact dimensions.
2)
HIGH
COPYING
SPEED
Approximately 15 half-size
sheets
(A4 or BS) can be
copied in one minute.
3)
DESK
-TOP COMPACTNESS
The
NP -70 copier is
designed highly compact so that the
least amount
of
space is
required.
As a result,
large copier performance
is obtained from
small copier
size.
4) AUTOMATIC
TONER
REPLENISHMENT (ATR)
EQUIPPED
ATR maintains a constant
density
of toner in
the
dispersant, resulting in
copying uniformity.
5)
BUILD
-IN
SAFETY FEATURES
In
the
event that
something
abnormal happens during
machine operation (ie:
a paper jam),
operations are
automatically
stopped.
6)
CASSETTE
-TYPE PAPER
FEEDING
Use
of different paper sizes is
easy
and
quick
due to the
cassette -type
paper
holder. Addition-
ally, any
troubles which might
be
caused by cassette
mis-feeding are
prevented by
build -in
safety circuitry.
© CANON INC. Second
Printing,lune,
1974

1-2 NP
-70
1.2
APPEARANCE
Fig 1-1 General
View of
the
NP
-70
Copyboard Cover
Copyboard:
Upper Access Door
Copy Tray
Handle
Control Panel'
Counter
Left Front Access
Door
Power
Switch
Power Lamp
Key Counter Socket:
Paper Cassette
Holds the
original on the
copyboard.
Moves
the
original horizontally during copying.
Can be
opened for
access
when something
goes wrong
with
paper
feeding.
Where
copied paper is collected.
Used
for opening/closing
copyboard
cover.
Contains machine controls.
Number
of half
size sheets
copied is indicated.
Opened/closed when supplying Premix developer an d concentrated
toner and when cleaning coronas.
Power is
switched on
when
the red -marked side
of
switch is pressed.
Lights up
when power is switched on.
Optional key counter is
positioned in
this
socket.
Copy paper is held for feeding into the copier.
Second
Printing,lune, 1974
©
CANON INC.

NP•70
1-3
n
~o ~
~
~~.~. .o
00
0
.
°
,~.R.
o®
,~.xY
o~
~F~KKE.~~
s
~_
Z.
O
Ready Lamp:
Copy Button:
Copy
Dial:
Dial Index
Mark:
Exposure Dial:
Stop
Button:
Paper Feed Check Lamp:
Paper
Supply
Lamp:
Developer Supply Lamp:
Starting Position
Mark:
Fig.
1-2
Control Panel
Flashes on
and
off for
some time
after main power is switched on.
Normal
copies
can
be
obtained even when
this lamp is fl ashing on
and
off;
however, do not
immediately touch
copies obtained under
this condition because toner on copy paper will not be sufficiently
dry.
Press
for
obtaining
copies.
Set the number
of
copies required to index mark.
Numbers on copy dial are set to this index mark.
Adjusts image density.
Press to stop copy operations
during
continuous
copying.
Lights up
when paper is not
properly
fed.
Lights
up
when paper inside the cassette
has
been depleted or when
the
cassette
is
not properly set inside the copier.
Lights up when the supply
of
Premix
developer has
been depleted.
Set the
mark on
the
copyboard
to this
mark when starting copying
operations.
©
CANON
ANC.
Second Printing,lune,
1974

1-4
NP•70
1.3 SPECIFICATIONS
1.3-1 PERFORMANCE
SPECIFICATIONS
Copying system : Canon
LP system
Developing process :
Liquid
system; Developing tray method
Copy
paper: Plain
paper
Originals :
Books,
single
sheets, three dimensional objects, and photographs.
Copying
speed :
15 half-size copies/min.
and 7
full-size
copies/min.
Paper sizes :
A3 (11.6" x
16.5"), B4
(10.1"
x
14.3"),
A4
(8.3"
x 11.7"),
BS (7.2" x 10.1 ")
Magnification: 1 1
Continuous
operation : Up to 25 sheets are automatically copied by setting the Copy Dial
to the
desired number;
more
than
26 copies are
obtained by
sett-
ing at
"M".
Toner
feeding :
Automatic feeding with ATR device.
Lens : 180 mm, F4.5 minor/lens
with diaphragm
Paper exposure :
Moving original exposure method
Image transfer : Corona transfer
Image fixing : Drying with heat
dispersion
plate
Table
1-1
Performance Specifications
of
the
NP -70
1.3-2 PHYSICAL SPECIFICATIONS
Dimensions
of body:
Width
Depth
Height
83.4
cm
(32-7/8") —Main body
only
125.0 cm
(49-3/16") -
w/ A3 cassette
&
copyboard in standard
position.
60.0 cm (23-5/8")
34.0 cm
(13-3/8")
Dimensions
of Pedestal
Width
Depth
Height
83.5 cm
(32-7/8") —Main body
only
153.5 cm (60-7/ 16") -
w/ side
tables
attached.
60.2 cm (23-11/16")
58.0 cm (22-13/16")
Power source: 100VAC (±
10%) 50/60Hz, 115VAC (±
10%)
60Hz
125VAC (±
10%)
60Hz, 220VAC (±
10%)
60Hz
230VAC
(±10%) SOHz, 240VAC (±10%)
SOHz
Power consumption:
1.2 kW
Operation atmosphere:
Temperature
Humidity
5
~
35 ° C (41
~
95°F)
20 ^- 85%
Table
1-2
Physical
Specifications of the NP -70
Second
Printing,June,
1974
©
CANON
INC.