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NP6251
Canon NP6251 Service Manual
Canon NP6251 Service Manual
Also see for NP6251:
Service manual
Service bulletin
Table of content
Contents
system configuration
Table Of Contents
Table Of Contents
Table Of Contents
Table Of Contents
Table Of Contents
Table Of Contents
Table Of Contents
Table Of Contents
Table Of Contents
I. FEATURES
II. SPECIFICATIONS
Performance
Others
B. Paper Deck-A1
III. NAMES OF PARTS
B. Cross Section
IV. OPERATING THE MACHINE
B. Extended Modes
C. User Mode
V. ROUTINE MAINTENANCE BY THE USER
VII. IMAGE FORMATION
basic operation
Holding Tray Feeding
B. Outline of the Electrical Circuitry
C. Basic Sequence of Operations
Basic Sequence of Operations at Power-On (2/2)
Basic Sequence of Operations
Basic Sequence of Operations in Page Separation Mode
D. Main Motor (M1) Control Circuitry
Operation
E. Inputs to the DC Controller
F. Outputs from the DC Controller
G. Inputs to and Outputs from Accessories
I. OUTLINE OF OPERATION
II. LENS DRIVE SYSTEM
Moving the Lens
III. SCANNER DRIVE SYSTEM
Scanner Sensors and the Signals
Movement of the Scanner in Page Separation Mode
Cable
Removing the Scanner Drive Cable
Adjusting the Tension of the Scanner Drive Cable
Adjusting the Scanner Home Position
Positioning the Scanner Locking Solenoid (SL1)
B. Lens Drive Assembly
Removing the Lens Stage Temporarily
Installing the Light-Blocking Belt Mount
Removing the Lens X Direction Drive Motor
Attaching the Lens X Direction Drive Belt
Replacing the Light Blocking Belt
Table Of Contents
I. PROCESSES
Control Method
Potential Measurement Circuit
B. Controlling the Intensity of the Scanning Lamp
Auto Exposure Control
Making Checks
C. Controlling the Primary/Transfer Corona Current
Controlling the Transfer Corona Current
D. Controlling the Separation/Pre Transfer Corona Current
Separation/ Pre-Transfer Corona Current
of the Separation/Pre-Transfer Corona Current
E. Controlling the Blanking Exposure Lamp (LED)
f. drum heater circuit
cleaning mechanism
A. Scanning Lamp Assembly
Removing the Thermal Fuse
C. Pre-Exposure Lamp Unit
D. Blanking Exposure Lamp Assembly
E. Photosensitive Drum
Replacing the Drum Heater
F. Potential Sensor Assembly
H. Pre-Transfer Charging Assembly
Separation Charging Assembly
J. Charging Wire
Stringing the Grid Wire of the Primary Charging Assembly
Adjusting the Height of the Charging Wire
Cleaning the Primary Charging Assembly Anti-Stray Sheet
K. Developing Assembly
Removing the Blade Unit
Cylinder and the Magnetic Seal
Cleaning the Developing Assembly Anti-Stray Sheet
L. Hopper Assembly
M. Drum Cleaner
Installing the Cleaning Blade
Installing the Side Seal
N. Separation Claw/Separation Claw Drive Assembly
O. Waste Toner Feeding Assembly
Table Of Contents
I. PICK-UP/FEEDING SYSTEM
II. CASSETTE PICK-UP
Outline
B. Cassette Lifter Operation
C. Identifying the Size of Copy Paper in the Cassette
Markings on the Width Guide Rail
Paper Size
Registering Paper Width Basic Value
b. lifter operation
d. high-speed pick-up
V. CONTROLLING THE REGISTRATION CLUTCH
VI. MAKING TWO-SIDED/OVERLAY COPIES
Outline of Operation
D. Reversal Delivery
Sequence of Reversal Delivery Operations
Sided/Overlay/Reversal Delivery Copies
Jogging Plate and the Trailing Edge Guide Plate
Detecting the Presence Absence of Copy Paper
F. Re-Pick Up from the Holding Tray
G. Skipping Operation
Outline of Operations
Skipping Operation (odd number of originals)
Reversal Delivery
VII. DETECTING JAMS
Registration Roller Delay Jam
Pick-Up Vertical Path Feeding 0/1 Delay Jam
Pick-Up Vertical Path Feeding 2 through 4 Delay Jam
Fixing Assembly Outlet Delay Jam
External Delivery Delay Jam
Internal Delivery Delay Jam
Holding Tray Inlet Delay Jam
Holding Tray Re-Pick Up Delay Jam
Holding Tray Registration Stationary Jam
VIII. DISASSEMBLY AND ASSEMBLY
A. Multifeeder Assembly
B. Front Paper Deck Assembly
Removing the Pick-Up Roller
Removing the Feeding Roller
Adjusting the Pressure of the Separation Roller
Orientation of the Separation Roller
Roller of the Cassette/Deck Pick-Up Assembly
Releasing Solenoid of the Cassette
Removing the Pick-Up Assembly from the Copier
Removing the Separation Roller
Roller Assembly of the Left Deck Pick-Up Assembly
Assembly
Construction
Removing the Registration Roller (upper rubber roller)
Removing the Fixing/Feeding Unit
Removing the Feeding Belt
H. Holding Tray Assembly
Removing the Holding Tray from the Copier
Removing the Holding Tray Registration Paper Sensor
Removing the Re-Pick Up Roller
Removing the Holding Tray Y Motor
Removing the Y Motor Home Position Sensor
Roller/Separation Belt Assembly
Removing the Separation Belt Assembly
Paper Deflecting Plate Drive Solenoid
Removing the Holding Tray X Motor
Removing the Holding Tray Paper Jogging Solenoid
Paper Jogging Guide Plate Assembly
the Holding Tray Assembly Paper Jogging Guide Plate
I. Holding Tray Feeding Assembly
Holding Tray Feeding Assembly
C. Controlling the Fixing Temperature
D. Reciprocating Mechanism for the Main Thermistor (TH1)
the Upper Separation Claw
F. SSR Error Detection Circuit for the Fixing Heater
G. Locking Operation (fixing/feeding unit)
H. Error Detection Circuit
Fixing Heater Error Activation Detection Circuit
Motor Error Rotation Detection Circuit
II. DISASSEMBLY AND ASSEMBLY
A. Fixing Assembly
Removing the Fixing Cleaning Belt
Installing the Fixing Cleaning Belt
Removing the Upper Fixing Unit
Removing the Fixing Heater
Installing the Fixing Heater
Installing the Upper Fixing Roller
Removing the Thermal Switch
Removing the Lower Separation Claw Assembly
Removing the Lower Roller
Adjusting the Nip (tightening the pressure adjusting nut)
Adjusting the Fixing Clutch
B. Delivery Assembly
Removing the Fixing/Feeding Assembly Locking Assembly
Paper Sensor and the Internal Delivery Paper Sensor
Removing the Internal Delivery Assembly Roller
Table Of Contents
I. CONTROL PANEL
LCD Processing
Automatic Control of LCD Contrast
Touch Switch Inputs
II. FANS
III. POWER SUPPLY
B. Power Supply Circuit
C. Date/Time Display Power Supply
IV. DISASSEMBLY AND ASSEMBLY
A. External Covers
Removing the Front Door
Removing the Inside Upper Cover
Removing the Fixing/Feeding Unit Front Cover
Sliding Out the Hopper Assembly
b. control panel
c. door switch assembly
d. fan unit
Removing the Cleaner Fan
Removing the Feeding Fan
F. Main Motor Assembly
G. Fixing/Waste Toner Drive Assembly
H. Main Drive Assembly (drum developing)
I. Vertical Path Drive Assembly
J. Pick-Up Drive Assembly
Removing
K. Duplexing Drive (1) Assembly
L. Lifter Drive Assembly
M. Cassette Pick-Up Drive Assembly
N. Attaching the Drive Belt
O. DC Controller PCB
P. DC Power Supply Assembly
Q. High-Voltage Transformer Assembly
R. Power Supply Inlet Assembly
paper deck-a
I. SIDE PAPER DECK
Outputs from the Side Deck Driver (1/1)
B. Pick-Up
Sequence of Operations (deck pick-up)
C. Detection of Paper for the Deck
D. Deck Lifter
Opening/Closing the Deck
Sequence of Operations (deck opening/closing)
Positioning the Roll
C. Drive System
Removing the Deck Main Motor (M101)
Removing the Deck Lifter Motor (M102)
Routing the Lifter Cable
D. Feeding System
Removing the Deck Pick-Up Roller
Removing the Deck Feeding Roller
Removing the Deck Separation Roller
Adjusting the Deck Separation Roller Pressure
E. Electrical System
Table Of Contents
I. SELECTING THE SITE
II. UNPACKING AND INSTALLING
A. Unpacking
B. Installing the Scanner
C. Installing the Fixing Assembly
D. Installing the AP Kit and the Charging Assemblies
E. Installing the Copy Tray
Replacing the Delivery Roller Leaf Spring
F. Checking the Developing Assembly
G. Installing the Pick-Up Assembly
H. Supplying Toner
i. connecting the rdf connector
III. RELOCATING THE MACHINE
IV. INSTALLING THE CONTROL CARD V
V. INSTALLING THE COPY DATA CONTROLLER-A1
installation procedure
B. Installing to the Copier
C. Checking the Operation
VI. INSTALLING THE REMOTE DIAGNOSTIC DEVICE II
I. PERIODICALLY REPLACED PARTS
II. CONSUMABLES AND DURABLES
Table Of Contents
a. image adjustment
b. exposure system
routing the scanner drive cable
c. image formation system
position of the roller electrode
d. pick-up/feeding system
e. fixing system
f. electrical system
a. initial checks
b. sample image faults
c. troubleshooting image faults
a. troubleshooting malfunctions
ac power is absent
dc power supply is absent
pick-up fails. (multifeeder)
the vertical path roller fails to rotate
the lens fails to move
pick-up fails. (paper deck-a)
a. copy paper jams
pick-up assembly
fixing/delivery assembly
cleaning assembly
b. feeding faults
a. sensors
c. motors and fans
d. clutches
f. pcbs
g. paper deck-a
check pins by pcb
ac driver pcb
control cpu pcb
holding tray driver pcb
potential measurement pcb
hvt1 pcb
hvt2 pcb
lamp regulator pcb
vii. service mode
b. using service mode
f. adjustment mode
h. options mode
i. counter mode
viii. self diagnosis
c. sorter
8)
Remove the two cable fixing screws (rear)
y
from the No. 1 mirror mount.
Figure 3-508
9)
Remove the two cable fixing screws (front) from the No. 1 mirror mount.
Figure 3-509
10) Loosen the tension screw
i
to loosen the scanner cable.
Figure 3-510
11) Remove the scanner cable.
i
u
y
COPYRIGHT
©
1997 CANON INC.
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 3
EXPOSURE SYSTEM
3-28
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This manual is suitable for:
NP6251
NP6350
