Canon PC740 Support Question
Canon PC740 Support Question
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Question posted by darshan20172 on September 2nd, 2012
Leaves Lot Of Black Dust On The Copy
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Related Canon PC740 Manual Pages
Service Manual - Page 3
..., and PC770 differ from time to time to reflect improvements rendered to the copier; This Service Manual consists of the following respects:
Model
PC720 PC740 PC750 PC770
Singlefeeding (manual)
- - CHAPTER 5 "INSTALLATION" gives step-by-step instructions for installing the copier together with the generation of replacement parts and consumables. a Service Information Bulletin will...
Service Manual - Page 5
OPERATIONS
1-8
CHAPTER 2 COPYING PROCESS
I . POWER SUPPLY
3-60
II. STANDARDS AND
III. IMAGE FORMATION SYSTEM 3-17
ADJUSTMENTS
3-64
IV. UNPACKING AND
INSTALLATION
5-1
III.
...3-59
CHAPTER 4 MECHANICAL SYSTEM
I. DRIVE SYSTEM
4-5
AND CLEANING SYSTEMS
4-28
III. FEATURES II. EXPOSURE SYSTEM
4-26
VII. RELOCATING THE COPIER 5-7
5-2
COPYRIGHT © 1994 CANON INC.
Service Manual - Page 9
.... • The copier's top unit may be opened to ensure stable copy images.
5. I. average of 0.01 ppm or less, maximum of 0.02 ppm or less. (1/100 to business card may be replaced with considerations for ease in maintenance work to make jam removal easy. Extra touches to the copies. • The black toner cartridge...
Service Manual - Page 10
CANON PC720/740/7501770 REV.0 AUG.1994 PRINTED IN JAPAN EMPRIME AU JAPON)
System
Item
PC720
PC740
PC750
Copying
Indirect static reproduction
Charging
Roller (direct charging)
Exposure
Slit (moving light source)
Copy density adjustment Automatic (AE) or manual
Development
Dry
Auto Pick-up
Manual
Cassette (1 holder) Singlefeeder
Multifeeder
Separation
Curvature separation + ...
Service Manual - Page 11
...(approx.; COPYRIGHT © 1994 CANON INC. at 20°C/68°F)
Continuous copying 100 copies (max.)
Copying speed
See Tale 1-1.
fixed)
*As recommended by Canon.
or more)
Multifeeder
Plain... gm/2 paper)
Copy tray
100 sheets (approx.; VgAtiMAW. CANON PC7201740/750M0 REV.O AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPON)
1 -3 Performance
Item
PC720
PC740
PC750
PC770
Original ...
Service Manual - Page 12
...1-101
Model PC740/750
10 10 10 10 10 7 8
PC720 8 8 8 8 8 6 7
1- 4
COPYRIGHT © 1994 CANON INC. reference only) 0.4 kWh (approx.;
about 5 min; including cassette)
Copy paper Keep ... (approx.)
Weight
20.0 kg /44.0lb (approx.; Others
Item
PC720
PC740
Temperature 7.5 to 32.5°C/45.5 to 90.5°F
Operating Humidity environment Atmospheric
pressure
5 to 85% 810...
Service Manual - Page 23
...response to open /close lever to the following :
C) Open the right door, and check if
there is copy paper. CI The 'P' indication should go through the following conditions:
C) When the cassette has run out ...put the sheets in order, and set copy
paper. D. CDI Take out the stack of paper, set the stack back in the cassette, go off, and
the copier will make the remaining number of the ...
Service Manual - Page 31
Primary charging)
(2. Drum cleaning
(3. Transfer 5. Outline
The copier uses a direct charging/transfer system with each component block arranged as shown in Figure 2-101... fixing roller Figure 2-101
Transfer charging roller Static eliminator
Latent static Image Formation
. Fixing
4. COPYING PROCESS MI
I. CANON PC7201740R50M0 REV.O AUG.1994 PRINTEDIN JAPAN OMPRIME AU JAPONI
2 - 1 ...
Service Manual - Page 32
INN COPYING PROCESS
The copier's image formation block consists of aluminum (conductor). Time (t)
0
Light area
-500
Surface potential (V) -.r------
-1000 Primary
charging (...
Figure 2-103
B.
At the end of this block, the areas on the photosensitive drum corresponding to the black areas of the original are left with negative charges and those corresponding to the human eye and, therefore, ...
Service Manual - Page 33
...REV.O AUG.1994 PRINTED IN JAPAN pmplatt AU JAPON)
2 - 3
COPYRIGHT © 1994 CANON INC.
COPYING PROCESS OM
C.
The DC bias applied simultaneously with the AC bias, on the other hand, serves to...2)
Optical image
Dark area Light area
Figure 2-105
The surface of static latent images. The copier uses its primary charging roller to a DC bias.
The primary charging roller is made of the...
Service Manual - Page 34
...developing assembly)
As shown in a thin, uniform layer. The copier's toner is greater than the positive component. The depositing roller ... constructed of magnetite and resins. The developing cylinder receives both black and color) made mostly of a fixed magnet and a ...COPYING PROCESS
E. Development (step 3)
Blade
Developing cylinder
Toner
0
Cylinder}Developing
Magnet cylinder
...
Service Manual - Page 66
... drum. Controlling the Voltage Level of the DC Bias to Suit the Copy Density Setting The copier varies the DC bias control
signal (DCBPWM) according to the settings shown...copy density.
• setting of the density adjusting lever (manual control mode)
• output of the AE sensor (automatic control mode)
• type of developing assembly
Type of developing assembly DC bias
Black...
Service Manual - Page 67
... -
-300 -
-400 -
-500 -
11 Developing bias DC component (V)
Position of SW101 Right
Center
Left
Copy density adjusting lever
1
3.5
0
6.5
9
-100 -
-200 -
-300 -
-400 -
-500 -
CANON...{V)
AE Mode Figure 3-310
b.
OPERATIONS AND TIMING=
a.
Black Developing Assembly
Test Chart 0
Density of Newspaper original
Copy density adjusting lever
1
3.5
0
6.5
9
-100 -
-100 -
-200...
Service Manual - Page 87
... CANONINC.
The control temperature for the fixing heater is determined by any of copies made in continuous mode.
Black Developing Assembly
Heater temperature at first press on Copy Start key after power-on
1 Lower than 100°C
2 100°C...Copies
1 to 9 10 to 14 15 to 19 20 to 24 25 to 29 30 or more 1 to 9 10 to 14 15 to 19 20 or more 1 to the type of the Fixing Heater The copier...
Service Manual - Page 91
... temperature of the main thermistor (TH1) is 190°C or less for the black developing assembly or 195°C or less for the color developing assembly, the distance...the control panel, 'EU will be indicated on the control panel if the power switch is detected during copying operation, the copier once again will indicate `E000' through 'E003' on the control panel.
b. CANON PC720/740/7501770...
Service Manual - Page 105
...AE/intensity sensor PCB • scanning lamp
Preparing for Adjustment 1) Set the black cartridge in the copier. 2) Set the density correction switch
(SW101) to the center notch.
0
SW101 ...Obtain a newspaper with photos and large titles. • Obtain five sheets of VR1O1 and Copy Density
Direction
Density
Clockwise
Darker
Counterclockwise
Lighter
Table 3-702
O
Of
.11, 100JP3 V8104 VP105...
Service Manual - Page 113
...(keys on for 5 sec during standby.
• The scanning lamp remains off for 5 sec during copying.
• An error is detected in the communication between the DC controller PCB and the composite power ...be detected after the lens has traveled over its maximum distance.
• The lens does not leave the lens home position.
• The lens home position cannot be detected after the lens has ...
Service Manual - Page 144
... Cover Shutter If the photosensitive drum is provided to show white spots or black bands; the light-blocking shutter is exposed to strong light for a long period of time, the copies
can come to protect the photosensitive drum from the copier; MI MECHANICAL SYSTEM
V. CANON PC72M40/7501170 REV.O AUG.1994 PRINTED IN JAPAN...
Service Manual - Page 154
... 0 Power cord
C) User's Manual C) Copying Guide
Warranty card
2 Remove the screw from a cold place, leave it alone unpacked for one hour or more until it by hooking hands
accessories is called condensation, and a copier subjected to the room. under its left side. UNPACKING AND INSTALLATION
When a piece of metal is brought in from...
Service Manual - Page 165
... photosensitive drum cover. f. Nevertheless, exposure to the copier
or if white spots appear on the photosensitive drum through...:
1.
Do not shake the cartridge in its end or upside down on the copies as toner runs out, hold the cartridge level as 10,000 to touch the photosensitive...spots or black bands". Do not ever leave it . Reference: If the drum is exposed to vibration
or shocks...
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