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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
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
I. BASIC MECHANISMS
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
Making Checks
C. Controlling the Primary/Transfer Corona Current
Controlling the Transfer Corona Current
D. Controlling the 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
b. standard white plate
c. pre-exposure lamp unit
e. photosensitive drum
f. potential sensor assembly
h. pre-transfer charging assembly
Outline
k. developing assembly
l. hopper assembly
m. drum cleaner
o. waste toner feeding assembly
Table Of Contents
b. cassette lifter operation
b. lifter operation
d. high-speed pick-up
d. reversal delivery
g. skipping operation
vii. detecting jams
registration roller delay jam
viii. disassembly and assembly
a. multifeeder assembly
b. front paper deck assembly
fixing system
motor error rotation detection circuit
Table Of Contents
b. operation
a. outline of power supply
b. power supply circuit
c. date/time display power supply
b. control panel
d. fan unit
e. removing the counter assembly
f. main motor assembly
n. attaching the drive belt
o. dc controller pcb
r. power supply inlet assembly
Table Of Contents
b. pick-up
c. detection of paper for the deck
d. deck lifter
f. controlling the deck motor
b. paper deck
c. drive system
e. electrical system
Table Of Contents
a. image adjustment
b. exposure system
c. image formation system
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
a. copy paper jams
b. feeding faults
f. pcbs
check pins by pcb
vii. service mode
b. using service mode
f. adjustment mode
i. counter mode
viii. self diagnosis
c. sorter
R. Power Supply Inlet Assembly
1)
Remove the rear cover.
2)
Remove the upper left cover and the lower left cover.
3)
Remove the four mounting screws
q
.
4)
Disconnect the four connectors
w
, and remove the power supply cord mount
e
.
Figure 7-470
q
q
w
e
COPYRIGHT
©
1997 CANON INC.
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 7
EXTERNALS/AUXILIARY MECHANISMS
7-54
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This manual is suitable for:
NP6251
NP6350
