Canon PC720 Support Question
Canon PC720 Support Question
Find answers below for this question about Canon PC720.Need a Canon PC720 manual? We have 1 online manual for this item!
Question posted by lfennell on June 23rd, 2012
Friction Wheel To Pick Up Sheet From Paper Tray In Canon Pc720 Is Not Turning.
The friction wheel that starts feeding the sheet from the paper tray in the Canon PC720 copier is not turning. How does one check and repair this problem?
Current Answers
Related Canon PC720 Manual Pages
Service Manual - Page 3
...copier together with the generation of the copier associated with checks to cover major changes. CHAPTER 5 "INSTALLATION" gives step-by-step instructions for troubleshooting problems in the field.
Multifeeding (manual)
-
Copying speed (cpm)
8 10 10 12
COPYRIGHT © 1994 CANON...the basic facts and figures about the plain paper copier PC720/740/750/770, and is compiled to serve as ...
Service Manual - Page 10
...medium OPC (24 dia.)
PC750
2.
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...
Service Manual - Page 17
....
May be between 70% and 141% in 1% increments. Table 1-401b
COPYRIGHT 1994 CANON INC.
Selects or deselects zoom mode. CANON PC720/7401750/770 REV.O AUG.1994 PRINTED IN JAPAN EMPRIME AU JAPON)
1- 9
Remarks
Selects the cassette as the source of paper or Selects the multifeeder. GENERAL DESCRIPTIONNM
Ref.
Name
11 Copy Count/ Zoom Set...
Service Manual - Page 23
... there is copy paper.
CDI Take out the stack of paper, set in the cassette. 2) If the cassette is paper in response to open /close lever to the following :
C) Open the right door, and check if
there is properly set the stack back in the cassette holder. 3) Press the Copy Start key. CANON PC720/T401759/770 REV...
Service Manual - Page 26
... Cover
Wipe it . If the dirt cannot be soiled or copy paper tends to jam frequently, advise the user to clean the following parts:
1. Cassette pick-up roller has dried completely. CANON PC720/7408EORT0 REVS AUG. 1994 PRINTED IN JAPAN tIMPRIME AU JAPONI
Cassette Pick-Up Roller 1) Remove the cassette. 2) Open the right cover. 3) Keep...
Service Manual - Page 33
...CANON PC720/740/150M0 REV.O AUG.1994 PRINTED IN JAPAN pmplatt AU JAPON)
2 - 3 Image Exposure (step 2)
Optical image
Dark area Light area
Figure 2-105
The surface of the photosensitive drum is made of static latent images.
Primary Charging (step 1)
A-Primary corona roller
ti AC bias DC bias
D. The copier... in the light area. COPYRIGHT © 1994 CANON INC. An AC bias serves to keep the ...
Service Manual - Page 36
...problem, the copier applies a positive voltage to the separation static eliminator to the paper while the copy paper moves through the fixing film and the pressure roller. Fixing (step 6)
Copy paper
O
Fixing heater
Thermistor Fixing film
Toner
Static eliminator
Figure 2-112
Copy paper... more or less at the center of the paper. CANON PC720,740/750i770 REY.0 AUG.1994 PRINTEDIN JAPAN DIARIME...
Service Manual - Page 38
IIIIIII COPYING PROCESS
II.
See p. 3-35 for details.
2 - 8
COPYRIGHT © 1994 CANON INC. CANON PC720/74017501770 REV.O AUG.1994 PAINTED IN JAPAN omPRimt AU JAPON) AUXILIARY PROCESS
1. Side Blank Exposure Side blank exposure is used to prevent
adhesion of excess toner to the drum by removing the residual potential in the nonimage areas of the drum.
Service Manual - Page 43
..., '0')
when surface temperature of fixing heater rises, voltage lowers. when PS3 detects paper, '1';
LT
displacement sensor PS 4
Single feeder paper - LJ- Inputs to the DC Controller (1/2) DC controller PCB
Scanner home position
sensor
[PS 1
Lens home position - L_I- LT
sensor (PC720/740) PS 7
Cartridge color sensor
-
Q752
TH 1
TH 2
J101-2 -1
-3
+5V
SCHP when...
Service Manual - Page 46
J109-7 -8
MFSLD* when '0', cassette/multifeeder
t +24V pick-up clutch solenoid turns on. SC_A*
(See p. 3-16 for details.)
SC A
J106-1 SB_LP*
when '0', blank exposure lamp on . CANON PC720/74017501170 REVD AUG.1994 PAINTEDIN JAPAN EMPRIMEAU JAPON)
J109-1 -2
LNSLD*
t +24V
when '0', lens drive solenoid turns on .
J110-1 -2 -3 -4 -5 -6
SC COMB
SC_B*
SC_B
during operation,
SC_COMA
...
Service Manual - Page 61
...FLOW) sent to the scanning lamp, thereby increasing the intensity of the scanning lamp. c. CANON PC720/7401150770 REY.0 AUG.1994 PRINTED IN JAPAN 0mpuit AU JAPAN)
3 - 21 Controlling the ....
The intensity sensor checks the intensity of the scanning lamp and generates activation power to the scanning lamp, thereby decreasing the intensity of the scanning lamp.
Turning On and Off the...
Service Manual - Page 63
...Start key
ON
STBY INTR
SCFW SCRV LSTR STBY
Main motor (M1)
Scanning lamp (FL1)
Primary charging roller DC bias Primary charging roller AC bias
P e-heatn -400V
-625V -400V
Figure 3-307
COPYRIGHT O 1994 CANON INC.
CANON PC720... control circuit checks the current of current taken so as to turn on the DC controller PCB. Switching the DC Bias Voltage Level The copier switches the level...
Service Manual - Page 68
... efficiency, the copier corrects the level of the transfer roller, ultimately affecting the transfer efficiency. EPower switch ON
I ECopy Start key ON
7 V
STBY INTR
SCFW
SCRV
SCFW
SCRV 1STR STBY
Main motor (M1) Cleaning bias Reference bias (ATVC) Transfer bias
sec (approx.) U
Figure 3-314
3 - 28
COPYRIGHT © 1994 CANON INC. CANON PC720/74000770 REV.O AUG...
Service Manual - Page 82
...
spring clutch, control ring, registration sensor, and registration solenoid (SL2). When the microprocessor on the DC controller PCB receives the pick-up detection signal from the pre-registration paper sensor (Q751), it turns on , the pawl moves away from the control ring, allowing the drive of the main motor to be transmitted to...
Service Manual - Page 91
...turned on the Copy Start key. The data, however, is retained only
about 5 min or more , copying operation is backed up and `E0' will respond to the heater, is stopped after discharging the ongoing copy; Checking for problems...through E003) on paper of the
fixing heater still keep rising after increasing the distance between
sheets of the fixing heater:
a. CANON PC720/740/7501770 REV.()...
Service Manual - Page 96
CANON PC720/74017501/70 REV.O AUG.1994 PRINTEDIN JAPAN (MPRIME AU JAPON)
IMMA OPERATIONS AND TIMING
Copy Start key ON
STBY
INTR
SCFW
Pick-up clutch solenoid (SL1) Jam check Registration sensor (Q751) Main motor (M1)
2.1 sec No paper 1.5 sec
Figure 3-422 (no paper)
Copy Start key ON
STBY
INTR
SCFW
Pick-up clutch solenoid (SL1) Jam check Registration sensor (Q751...
Service Manual - Page 98
... sensor within a specific period of time because of a feeding problem, the
copier identifies a pick-up delay jam, stops copying operation, and flashes the Jam message. (This detection is not executed in singlefeeder mode.)
Copy Start key
ON
V STBY INTR
SCFW
SCRV
SCFW
Registration clutch solenoid (SL2) Jam check Registration sensor (Q751) Main motor (M1)
5.0 sec 4 Normal...
Service Manual - Page 131
After attaching the fan belt, make sure that the belt is free of twists.
00
0 U
Figure 4-240
COPYRIGHT 1994 CANON INC. CANON PC720/7401150M0 REV.O AUG.1994 PRINTED IN JAPAN MARINE AU JAPOIN
4 - 15 4) Remove the insulating sheet S.
OS
MECHANICAL SYSTEM!
6) Remove the four screws ®, and remove
the main motor unit S.
0 0 /1/
U 11/
Figure 4-239...
Service Manual - Page 136
....")
2) Remove the bushing 0 and the gear C)
while disengaging the claw C).
CANON PC720/7401750/770 REVD AUG.1994 PRINTEDIN JAPAN phipmmt AU JAPON) IM MECHANICAL SYSTEM
5) Disconnect the two connectors CD, and
remove the screw S; Figure 4-316 6) While extending the bushing ®, remove
the pick-up clutch O.
0
0
Figure 4-318
Figure 4-320
4 - 20
COPYRIGHT ©...
Service Manual - Page 156
Checks/remarks
11
Push the icon on the copier's top
f
unit... Zoom key to make sure that the AE and DIRECT indicators turn on, outlet, and turn on a level surface, and peel the tip of the opening...Paper message flashes. • Press the Copy Count/Zoom Set key and Clear/Stop key to make sure that the correct copy count is indicated.
5 - 4
COPYRIGHT © 1994 CANONINC.
CANON PC720...
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