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 annratcliffe on June 22nd, 2011
Light Copies
Though new toner has been installed, copies come out too light to read.
Current Answers
Related Canon PC720 Manual Pages
Service Manual - Page 3
...copier PC720/740/750/770, and is compiled to serve as a handy reference for the following chapters: In CHAPTER 1, "GENERAL DESCRIPTION," a brief discussion of the copier's features, specifications, and an explanation of copies...in the field. CHAPTER 5 "INSTALLATION" gives step-by-step instructions for installing the copier together with respect to the copier; CANON PC720174017501770 REV.0 AUG....
Service Manual - Page 10
=GENERAL DESCRIPTION
II. 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 + static eliminator
Fixing
Flat heater
Cleaning
...
Service Manual - Page 12
... INC.
reference only) 0.4 kWh (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% 810.60 to protect against humidity. about 5 min; keep at 40°C/85% or less. =GENERAL DESCRIPTION
4. including cassette)
Copy paper Keep wrapped to 1013.25hPa
Power 115V60Hz...
Service Manual - Page 19
...7) Set the copy count you may set more than one is left alone for about 5 min without further key operation, automatically turning off the power.
1.1 Using Transparencies (PC720/740) 1) ...activated if the copier is delivered. Figure 1-403
2) Place an original on the copy
tray upright. When you want to manually adjust the copy density, deselect AE, and operate the Copy Density Adjust ...
Service Manual - Page 23
...not to remove all pieces of copies. D. If there is properly set copy
paper. C) Make sure that the cassette is paper in the cassette holder. 3) Press the Copy Start key.
CANON PC720/T401759/770 REV.O AUG.1994...cover, and check if there is out of paper, set in the cassette, go off, and
the copier will make the remaining number of paper if it . Figure 1-410
4) Pull out any . Remove the...
Service Manual - Page 24
...you (of the copier.
0 7I ,sue 0
Figure 1-415
Figure 1-413
2) Set the cartridge in Figure 1-410.
2. a. CANON PC720840r/501770 REV.OAUG.1994 PRINTEDIN JAPAN0MPRIMEAU JAPON) see Figure 1-409. It ;e read this ME '... to use . hod of
toner, the copy image will tend to run out of use the cartridge, a new cartridge should be obtained. functions. b. If the copy image has returned to normal,...
Service Manual - Page 26
... switch. 1) Shift up . *Be sure to open /close lever to wring it .
CANON PC720/7408EORT0 REVS AUG. 1994 PRINTED IN JAPAN tIMPRIME AU JAPONI Copyboard Glass/Copyboard Cover
Wipe it .
Lighte Darker
Figure 1-420
Caution: Do not make copies until the cassette pick-up roller
Separation pad
Figure 1-421
1 - 18
COPYRIGHT © 1994...
Service Manual - Page 33
... photosensitive drum is charged to a uniform negative potential in the light area. An AC bias serves to keep the surface potential of the original is applied to the roller in addition to neutralize the charges in preparation for pre-exposure.
CANON PC720/740/150M0 REV.O AUG.1994 PRINTED IN JAPAN pmplatt AU...
Service Manual - Page 36
...that melting toner will not stick to a specific temperature.
2 - 6
COPYRIGHT © 1994 CANON INC. To prevent such a problem, the copier applies a positive voltage to the separation static eliminator to the paper while the copy paper moves... and heats only the area where the fixing film comes into contact; CANON PC720,740/750i770 REY.0 AUG.1994 PRINTEDIN JAPAN DIARIME AU JAPON)
Service Manual - Page 38
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. CANON PC720/74017501770 REV.O AUG.1994 PAINTED IN JAPAN omPRimt AU JAPON)
AUXILIARY PROCESS
1. See p. 3-35 for details.
2 - 8
COPYRIGHT © 1994 CANON INC. IIIIIII COPYING PROCESS
II.
Service Manual - Page 63
...and the transformer (T508) by the pulse signals generated by the oscillation/amplitude control circuit. CANON PC720/740/750/770 REV.O AUG.1994 PRINTED IN JAPAN omput AU JAPON)
3 - 23 The AC...circuit.
Operation a.
Switching the DC Bias Voltage Level The copier switches the level of current taken so as to whether or not copy images are being formed. The DC bias voltage is controlled...
Service Manual - Page 68
... output timing of toner to the photosensitive drum.
• during last rotation. CANON PC720/74000770 REV.O AUG.1994 PRINTED IN JAPAN pmpFeat AU JAPAN) OPERATIONS AND TIMING
F. Outline The copier uses a direct transfer method
with a roller. Cleaning Bias
The copier uses a direct charging method, and could allow adhesion of each time the Copy Start key...
Service Manual - Page 74
...TIMING
9) Make one copy, and check if it is free of fogging but the print is noted or the characters are too light, repeat the steps ...starting with step 1) once again. • If the problem cannot be corrected after going through the steps once again, use the density correction switch (SW101).
0
D
SW101 Figure 3-323
3 - 34
COPYRIGHT © 1994 CANON INC. CANON PC720...
Service Manual - Page 76
... pick-up system consists of copy paper. No.
the pick-up /feeding path; PICK-UP/FEEDING SYSTEM
A. Outline
The copier uses center reference feeding, in which copy paper is then moved to the...is equipped with three sensors to the copy tray. Name
Remarks
PS3 Delivery paper sensor
Q751 Pre-registration roller paper sensor
PS7 Singlefeeder paper sensor PC720/740
DC controller PCB 0
CC--...
Service Manual - Page 78
... as soon as the registration roller. Controlling the Pick-Up Roller
1. The PC720/740's pick-up roller consists
of a cassette pick-up roller and a singlefeeder ...copy paper so that it matches the leading edge of drive transmission;
this way, the drive is switched by the spring clutch, control ring, and pick-up roller. The registration roller, in turn, serves to either of the copier...
Service Manual - Page 91
... the voltage of copies.
6. Protection Mechanisms The copier is equipped with the heater is detected during copying operation, the copier once again will ...occurring in areas where paper does not come into contact while copies are made continuously on the control panel...detects 255°C or more after discharging the ongoing copy; CANON PC720/740/7501770 REV.() AUG. 1994 PRINTED IN JAPAN ...
Service Manual - Page 98
...not reach the delivery sensor within a specific period of time because of
a feeding problem, the copier identifies a delivery stationary jam, stops copying operation, and flashes the Jam message. CANON PC720/740R501770REV.OAUG.1994 PRINTEDIN JAPANDMPRIMEAUJAPON)
iMMOPERATIONS AND TIMING
3. Copy Start key
ON
81,
V
STBY INTR
SCFW
SCRV
SCFW
Registration clutch solenoid (SL2) Jam check...
Service Manual - Page 134
... the Pick-Up Clutch (PC720/740)
1) Remove the top cover. (See "Removing the Top Cover.")
2) Open the copier's top unit, and fix it in position using the grip of the screwdriver (about 30 mm dia.).
000
0
Figure 4-305
3) After installing the multifeeder unit, select multifeeder mode and make one copy. Caution: Take care not...
Service Manual - Page 156
... key to make sure that 'Yo' is indicated, and press the Copy Count/Zoom key to the power • Make sure that the correct...4
COPYRIGHT © 1994 CANONINC.
Checks/remarks
11
Push the icon on the copier's top
f
unit to close.
12 Connect the power cord to the power ...PC720/740501170 REV.0 AUG. 1994 PRINTED IN JAPAN (IMPRIME AU JAPON) INSTALLATION
Step
Work
9 Place the cartridge ...
Service Manual - Page 164
...handle it is kept in the copier, and its properties change rapidly...installed in a box. Avoid areas subjected to strong light. Avoid areas subject to 104°F
Humidity 90% or less
Table 6-402 Conditions (transportation)
B.
The cartridge also contains toner... 1994 CANONINC. Do not keep it . CANON PC720.74011501T1R0EV.0 AUG.1994 PRINTEDIN JAPAN (IMPRIME-AUJAPON) ...
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