Canon PC940 Support Question
Canon PC940 Support Question
Find answers below for this question about Canon PC940.Need a Canon PC940 manual? We have 1 online manual for this item!
Question posted by peteavers on April 21st, 2021
Pc 940 Issue.
why is my PC 940 copier distorting copies when I increase and decrease the size percentage. It slants things like maps and I can't get them to scale.
Current Answers
Answer #1: Posted by hzplj9 on April 22nd, 2021 12:58 PM
hzplj9
Member since:
June 25th, 2012 Points: 4,873,500
Member since:
June 25th, 2012 Points: 4,873,500
This is a link to the service manual for your printer.
https://www.manualslib.com/manual/442256/Canon-Pc920.html#product-PC940
I have also attached a link to Canon as well. If you go to page 3 of the FAQs there are 2 references to your problem. With the aid of both it should help you solve your problem. I would think it could be an issue with the transport and maybe the laser area which needs cleaning.
https://www.usa.canon.com/internet/portal/us/home/searchresults?query=PC940&searchTab=support
Hope that helps.
Related Canon PC940 Manual Pages
Service Manual - Page 1
PC940 F13-8436
PC941 F13-8437
PC950 F13-8231 F13-8241
PC960 F13-8434
PC980 F13-8232
PC981 F13-8233
TVD00001- TVH00001-
TZA00001-
FY8-13GA-000
...
Service Manual - Page 2
... INC. 5-1, Hakusan 7-chome, Toride-shi, Ibaraki 302-8501 Japan
COPYRIGHT © 1999 CANON INC.
ANY QUESTIONS REGARDING INFORMATION CONTAINED HEREIN SHOULD BE DIRECTED TO THE COPIER SERVICE DEPARTMENT OF THE SALES COMPANY. COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
IMPORTANT
THIS...
Service Manual - Page 5
...AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
iii Model
PC860 PC880 PC890 PC920 PC920 PC920 PC920 PC921 PC940 PC941 PC950 PC950 PC950 PC960 PC980 PC981
Type code
TYA TZA UAA PUD PUE PUH TVB TVC TVD TVE PUF... PUG TVF TVG TVH TVJ
Multi-
• This service manual covers the models shown in question is available. Copying speed (cpm) at Direct
12 12 12 10 10 10 10 10 13 13 12 12 13 10 13 ...
Service Manual - Page 7
CONTENTS
CHAPTER 1 GENERAL DESCRIPTION
I . SPECIFICATIONS 1-2
A. Copier 1-2 B. Outline of Operations 2-3
D. Controlling the Main Motor (M1 2-5
E. Varying the Reproduction Ratio 3-2 C. Lens Drive Assembly ......... 3-31 C. ADF 1-8 III. Cross Section 1-13
IV. Outline 1-20
CHAPTER 2 ...
Service Manual - Page 11
...; 1999 CANON INC. ROUTINE MAINTENANCE BY THE USER 1-17
VI. Copier 1-2 B. Control Panel 1-15
V. IMAGE FORMATION 1-20 A. ADF 1-8 III. CHAPTER 1 GENERAL DESCRIPTION
This chapter provides specifications of the machine, instructions on how to operate the machine, and an outline of copying process.
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME...
Service Manual - Page 13
...copying work .
6. Large Paper Source • The source of ozone: 0.01 ppm or less on .
4.
The user may contain as many as a single entity (cartridge).
Personal Copier with existing Canon machines).
3. Various Paper Sizes... at maximum (1/100 to make jam removal easy.
8. ADF Type • Continuous copying is 0 sec (at all times as long as a business card.
5. CHAPTER ...
Service Manual - Page 14
Copier
1. Type Item
Body Copyboard Source of light
Lens Photosensitive medium
2.
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) Mechanisms Item
Reproduction Charging Exposure Copy...) Slit (moving light source) Auto or manual Dry (toner projection) Cassette (1 pc.) Single-feeder (single-feeder type) Multifeeder (multifeeder type) Curvature separation + static eliminator...
Service Manual - Page 41
..., transfer charging roller, pickup roller, vertical roller, registration roller, feeding assembly, fixing assembly, delivery roller, heat exhaust fan
Control
Executes on/off control. Error detection
Issues 'E010'. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
2-5
Outline Table 2-102 shows the functions of the main motor control circuit...
Service Manual - Page 207
Outline
The ADF picks up the originals stacked on the original tray starting with the topmost original, moves them through the copyboard, and delivers them.
See Figure 8-101 for an outline of the feeding route. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
8-1 ADF
Original tray
Copier
Figure 8-101
COPYRIGHT © 1999 CANON INC.
ADF
A. CHAPTER 8 ADF
I.
Service Manual - Page 208
... block]
Sensor Switch
ADFcontroller PCB
CPU (Q1)
ROM (Q2)
24V 5V
Motor
Serial communication
Copier
Composite power supply PCB
Figure 8-102
8-2
COPYRIGHT © 1999 CANON INC. CANON PC800s/900s... Basic Construction
1. The copying modes selected on the ADF controller
PCB. The CPU on the ADF controller PCB reads the signals from the sensors and the copier and
generates signals to ...
Service Manual - Page 209
...)
+5V J5-7
-9 PDP3
When original is detected, '0'.
-8
(when light-blocking plate is at sensor)
J3-1
-2
-3 -4
See p. 8-15.
-5
J3-6
-7 See p. 8-14.
J114
J202
J2
Serial communication
Copier
*Negative logic. CHAPTER 8 ADF
2. Inputs to and Outputs from the ADF Controller PCB a. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON...
Service Manual - Page 220
... AU JAPON)
The CPU (Q1) on the ADF controller PCB sends the motor drive signals PM0 and PM1 to flash the JAM indicator on the copier and stop the pickup motor at the same time.
Controlling the Pickup Motor
1.
Outline Figure 8-121 is equipped with a limiter function, preventing overcurrent from flowing...
Service Manual - Page 223
...MS1)
J6-1 COM J6-2 NO
J101-1 24V J1-1
Composite power supply PCB
J101-3 5V
J1-3
Circuitbreaker (CB1)
Fuse resistor (R1)
Logic
Copier
ADF controller PCB
Figure 8-124
Belt motor (M1) Pickup motor (M2)
Delivery sensor (PI1) Registration sensor (PI2) Original placement sensor (PI3)
... will continue to keep each sensor powered even when the ADF is supplied by the copier with 5 V and 24 V.
Service Manual - Page 226
CHAPTER 8 ADF
6) Disconnect the two connectors [8], and remove the screw [9]; CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
then, remove the cable bush [10].
[10]
[8]
[9]
7) Remove the two lockpin [11], and remove the ADF from the copier.
[8]
Figure 8-204
[11]
[11]
Figure 8-205
8-20
COPYRIGHT © 1999 CANON INC.
Service Manual - Page 227
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
8-21 Removing the ADF.") 2) Remove the feeding roller [1] from the copier.
(See "A. B. External Covers
CHAPTER 8 ADF [1]
Remove the covers as follows when cleaning, checking, or repairing the inside of the machine: 1) Remove the ADF from the
...
Service Manual - Page 244
... tape.
3 Remove the shipping attachment [1] (goldcolored screw) from the left of water tend to make sure that none is known as "condensation" and, in copiers, can cause blank copies. If the machine has been brought in step 9.
9-2
COPYRIGHT © 1999 CANON INC.
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME...
Service Manual - Page 267
... controller PCB."
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) or the cover.
Connect the positive probe. J109-2 (-) ......
is not the copier's. Connect the negative probe.
11-2
COPYRIGHT © 1999 CANON INC.
YES Rest omitted.
• Often, you are expected to the
NO
power outlet?
example: J109...
Service Manual - Page 270
... is copied in Direct. VR105
J131 J101 J102 J101
J130
J114
J102 VR104VR105VR106
VR107
VR103VR102 J107
J103
J104
J105
J109
J106
Figure 11-202
Turing VR105 and Leading Edge Non-Image Width
Direction of VR105 Clockwise
Counterclockwise
Leading edge non-image width Decreases Increases
Table 11-201
COPYRIGHT © 1999 CANON INC.
Copier a. Caution...
Service Manual - Page 331
...
Cause Malfunction
DC controller PCB.
YES/NO YES
NO
Action End. (Check the wiring between the copier's DC controller PCB and the ADF controller PCB.) Replace the ADF controller PCB.
345
ON 12
...
5V power supply
2 Set the matter to the 20VDC range, and connect the + probe to the copier ground. YES End. Replace the DC controller PCB.
NO Replace the composite power supply PCB.
11-66...
Service Manual - Page 352
...CANON INC. without error
code indication. the communication is monitored at all times.
• During a copying run, the +24 V power deviates from the control value by MLOCK=0) for 1 sec or ... PCB is
faulty. • The frequency of the allowed interval.
• The communication with the copier is faulty.
CHAPTER 11 TROUBLESHOOTING
Code
Cause • The main motor (M1) is fault. •...
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