Canon NP-6020 User manual

NP6020
SERVICE
MANUAL
(for'2201240V)
REVISION 0 MAY 1993
I Canon
FY8-13CT-000
COPYFtIGHT 1993 CANON INC.
CANON NP6020 REV.0 MAY 1993 PRINTED IN JAPAN
Download Free Service Manual and Resetter Printer at http://printer1.blogspot.com

1. GENERALDESCRIPTION-
---\/ I. FEATURES
1. Front-loading.
- The copier is designed to accept cassettes from the front for ease of use (two cassettes
holding 250 sheets each).
l The copier is given two cassette holders, thereby eliminating the need for cassette
replacement in making copies of different sizes.
* The copier’s multifeeder allows Jeeding multiple postcards.
2. Full line of automatic features
- The copier has an auto paper selection mechanism as standard, which selects paper of
the correct size in response to placement of a document.
- With the auto reproduction ratio selection mechanism, the copier calculates the correct
reproduction ratio according to the specified copy size.
* The AE (auto exposure) mechanism ensures crisp reproduction of newspapers and blue-
print documents.
I\ - The copier’s auto-start feature lets you press the COPY START key during the wait period
: sothat the copier will start making copies as soon as it becomes ready.
3. HQ jumping toner.
- The copier uses Canon’s own HQ (high quality) jumping toner for reproduction of clear
characters and photos.
l The toner is a single-component type, which provides stable images.
l In addition, a 30mm-dia. high sensitivity OPC drum is used to enable enhanced image
reproduction and a compact copier design.
4. Man-machine interface.
l As many as 20 copies (A4, landscape) may be made per minute.
- The zoom mechanism allows reduction down to 50% and enlarqement up to 200% of the
original image.
- The page separation mode serves to speed up copying bound documents.
- The copier accepts documents as small as a postcard or as large as A3.
* With the CT Unit (option), the copies may be in red, green, blue, or brown
-’ I
‘1
5. A variety of options to choose from for full automation.
The copier commun/cates with its options at a higher speed than ever, resulting in more
output per given time’.
* With options, up to 20 copies/min; 1:1 (A4, landscape).
* ADF-Al for automatic document feed.
- Sorter-Al for automatic sorting and grouping (20 bins)
l MS-Al for automatic sorting aid grouping (70 bins).
* Control Card V (configured as built-in) for copy volume control (up to 200 groups).
l Stapler Sorter-BNIl for stapling copies sorted in its ten bins.

- 1. GENERAL DESCRlPTlON
II. SPECIFICATIONS
A. Type
Body Desk top
Copyboard Fixed
Light source Halogen lamp (330 W)
Lens Zoom lens
Photosensitive medium OPC
6. Construction
Copying
Charging
Exposure
Copy density adjustment
Development
Pick-up Automatic
Manual
Transfer
Separation
Cleaning
Fixing
Indirect static photocopying
Corona
Slit (moving light source)
Automatic (AE) or Manual
Dry (toner projection)
2 cassettes
Multifeed (about 50 sheets of 80g/m2)
Corona
Curvature and Static eliminator
Blade
Heat roller (950 W)

1. GENERAL DESdRlPTlON -
C. Performance
Document type Sheet, Book, 3-D object (2 kg)
Document size (max.) A3 (297x420 mm)
Reproduction ratio See Table l-l ;50% to 200%, zoom.
Wait time 90 set or less (20°C)
First copy 8 set or less
Continuous copying 1to 99 copies
Copy size A3 (297 x 431.8 mm) max.
Postcard (100 x 148 mm) min.
COPYpaper Cassette Plain paper (64 to 80 g/m”), Tracing paper*,
Colored paper*
Multi feed tray Plain paper (64 to 128 g/me), Tracing paper’
Colored paper*, OHP film*, Postcard, Label’
Tow-sided Plain paper (64 to 128 gim2), Colored paper*,
Overlay copy Postcard
Cassette Claws, Front loading: 27 mm deep (about 250
sheets of 80 g/m*)
Copy tray 99 sheets (80 g/m*)
Non-image width 2.0 +1.5 mm (leading edge),
2.5 +1.5 mm (left/right)
Auto clear mechanism Provided. (2 min. standard)
Auto shut-off mechanism Provided. (2 hours, standard; may be disabled)
Auto start Provided.
Option Sorter-Al, MS-Al, Paper Deck Pedestal-J1,
Control Card V, CT Unit, Stapler Sorter-D1
Stapler Sorter-62
* Of a type recommended by Canon.

D. Others
(Sound power level as
prescribed by ISO)
Consumables
Keep in box or pedestal; avoid direct sun,
and keep it under 30% 85%
I

I, GENERAL DESCRIPTION -
Reproduction mode Paper size Cassette Copies/min
A3 (297x420mm) A3 11
A4 (21Ox297mm) A4 20
I
A4R (297x210mm) I A4R I 15
DIRECT 84 (257x365mm) (84) 12
85 (1e2x257mm) (85) 21
A5R (21Ox149mm) I A5R I 20
I 50%
REDUCE II A3 + A4R A4R 13
I A4R --3A3 A3 11
ENLARGE II 200%
Table l-1
~pecificafionsare subjecf lo change without notice.

A. External View
-1. GENERALDESCRIPTION
III. NAMES OF PARTS
@Control panel
@ Power switch
@ Upper cassette
@ Lower cassette
@ Front door
@ Delivery cover
Figure l-1
@ Copyboard glass
@ Multifeeder cover
@ Multifeeder tray
@! Developing assembly release lever
Feeder assembly release lever
@ Fixing assembly knob
Figure l-2

,-- j\
I
,
I
,,.=,
1. GENERALDESCRIPTION -
B. Cross-Sectional View
@ No. 3 mirror
@ No. 2 mirror
@ No. 1 mirror
@ Scanning lamp
@ Copyboard glass
@ Copyboard cover
0 Lens
@ Pre-exposure lamp
@ Primary corona unit
@ No. 6 mirror
0
Q
Q
0
63
63
@
Figure 1-3
No. 5 mirror
No. 4 mirror
Registration roller
Multifeeder tray
Vertical feed roller 1
Vertical feed roller 2
Cassette 1 pick-up roller
Cessette 2 pick-up roller
Feeder roller
Transfer corona unit
@ Static eliminator
@ Photosensitive drum
@ Cassette 1
Q Cassette 2
@ Feeder unit
@ Ozone filter
@ Exhaust fan
@ Fixing unit
@ Delivery roller
CANON NPS020 REV0 MAY 1993PRNTED NJWNN(IMFRMEW JUUN) I-7

- 1. GENERALDESCRIPTION
IKOPERATION
A. Control Panel
Figure l-4
SORT/GROUP/STAPLE SORT key
Press it to select the sort group, staple sort
or non-sort mode. The indicator remains
unlitwhen the non-sort mode is selected.
* sorting
z- grouping
0 staplesorting
PAGE OPERATlON key
Press itto seled the page separation mode.
JAM indicator
CONTROL CARD indcator
ADD PAPER indicator
ADD TONER in&&r
COPY COUNT/RATIO indiitor
It indiites the reproc+Jdon ratiowhen the %
key is pressed.
COPY START key
- glows orange when the copier isnot ready
forcopying.
- gk3wsgreen when the copier is ready for
copying.
RESET key
Press it to reset the copier to its default
settings.
Default Settings
* copy count 1
- DIRECT
- AE (may be turned OFF using ‘C15’ of
service mode)
CLEARSTOP key
STANDBY key
POWER switch
POWER indicator
The indicator remains ON while the power is
on.
Numeric keypad
% key
Press itto check the reproduction ratio on the
copy count indicator.
The display changes to the copy count 2 set
after the key is released.
ZOOM key
Press it to select a desired reproduction ratio
between 50% and 200% in 1% increments.
AUTO RATIO key
Press it to select or deselect the auto ’
reproduction ratio mode.
The key is effective when the ADF is
attached.
PAPER SELECT/JAM indicator
,A LED goes ON to indicate the locatin of
the paper or flashes to indicate the location of
thejam, ifany.
PAPER SELECT key
Press it to select automatic paper selection
(may be turned OFF using ‘CO7 of service
mode) or cassette or multifeeder as the
source of paper.
ENLARGE key
DIRECT key
REDUCE key ’ -.
AE (automatic exposure; density adjusbnent)
key
COPY DENSITY lever

B.
*-j 1)
2)
5)
,,=7, j/
’ ‘3)
Basic Copying Operation
Set the power switch to ON.
If the temperature of the fixing roller
is too low for copying, the indicator
of the COPY START key will blink
green.
When the temperature of the fixing
roller becomes high enough for
copying, the indicator will glow
green.
The normal *waiting time at room
‘temperature (20°C) is about 90
seconds.
Raise the copyboard cover, place an
original on the copvboard with the side
to be copied facing down, and align it
with the size index.
To adjust the copy density manually,
the AE key indicator should be OFF;
press the key once if it is ON. Set the
COPY DENSITY lever to suit the
original.
Check the size of paper in the cassette.
a) If the cassette does not have the
desired size of paper, remove it
and install a cassette with the
desired size.
Set the required number of copies (1 to
99) using the NUMERIC keypad and
confirm that the correct number
appears on the COPY COUNT/RATIO
indicator.
a) If an error was made in inputting
the number of copies, press the
CLEAR/STOP kev and reset the
number of copies. _
Press the COPY START key.
To stop a continuous copying
operation, press the CLEAWSTOP
key or RESET key. The copier will
complete the copy in progress,
then stop.
The COPY COUNT/RATIO
indicator will display the initial copy
quantity.
It is possible to switch from
automatic exposure control to
manual density adjustment at any
time from the start of copying to the
completion of the final copy.
However, it is not possible to switch
from manual density adjustment to
automatic.
C.
:;
:;
5)
6)
87;
9)
19)
11)
If the copy is too dark or too faint using AE,
cancel AE and vary the copy density with
the COPY DENSITY lever.
If the ADD PAPER indicator goes
ON during copying, the copier will
stop. Refill the cassette and press
the COPY START key. The
remaining number of copies will be
made automatically.
If the copier has an ADF, place a
document (original) on the
document tray. The document will
be fed automatically and copying
will start.
If no other operation is performed,
the copier will return to the
standard mode approximately 2
min after it completes a copy or
after the last key operation.
The copier shuts itself off auto-
matically 2 hours after power-on
(auto shut-off function; may be
turned off using ‘CO8’ of service
mode).
Pick-Up from Multifeeder
Set documents on the copyboard.
Press the PAPER SELECT kev to
select the multifeeder.
Open the multifeeder tray.
Open the multifeeder cover.
Set the slide guide to the size of the
copy paper.
Set copy paper.
0 As may as 50 sheets (80 g/mz) may
be set.
Close the multifeeder cover.
Set the desired reproduction ratio using
the DIRECT, REDUCE, ENLARGE, or
ZOOM key.
Cancel the AE mode, and set the
COPY DENSITY lever if manual
adjustment of the density is desired.
Enter the number of copies using the
numeric keypad.
Press the COPY START key.
Example:
l-9

D. Two-Sided Copying
Copy one side of a 2-sided original.
Turnover the original so that the same edge
faces the front. Turnover the copy in the
same way (from edge facing the front) and
feed it into the copier.
a) Use dry, uncurled paper.
b) Use paper in the weight range 60
to 128 glmz.
c) When making two-sided copies,
only one image can be made on
each side of the copy paper.
d) Both overlay and two-sided copies
cannot be made on the same
sheet of copy paper.
Figure l-5
E. Overlay Copy Operation
By changing the developing assembly,
a P-color copy can be made on the same
side of the copy paper.
Use paper in the range of 64 to
128 glm2.
When making an overlay copy, a
maximum of two images can be
made on one side of the copy
paper.
Overlay and two-sided copies
cannot be made on the same
sheet of copy paper.
F. Auto Start
The auto start mechanism may be
made use of while the copier isin the wait
mode (COPY START key blinking green);
i.e., after it is switched ON or after the
standby mode is canceled.
Set a document while the copier is in
the wait mode, and select the copy modes;
then, press the COPY START key.
The COPY START key changes from
blinking green to orange to indicate that the
auto start mechanism has been activated. ,-
The copier starts making copies as
soon as it enters the standby mode using \__
the selected copy modes,
The auto start mechanism may be
canceled by pressing the CLEAR/STOP or
RESET key.
G. Auto Shut-off
If the copier is not used for two hours,
the power will turn OFF automatically. (The
Standby key will flash orange.)
To turn the power back ON, press the
Standby key.
H. Replacing the CT Unit
1) Open the front door.
2) Swing the developing assembly release ’.__
lever counterclockwise.
3) Pull the developing assembly forward.
4) Grasp the handle of the developing
assembly, and raise it carefully.
Figure l-6
5) Place the CT carefully on the devel-
oping assembly guide rails and push it
in the copier.
6) Shift the developing assembly release
lever clockwise until it is horizontal.
7) Close the front door.
1i. ,D’o nbt~tilt~“or.handle the developing
“i as&mbly prthe CT unit roughly.’
:ii. Dp”not .plaq the develapinng assembly
dr the’,,CTunit on’the floor.: Be sure to 1
” .:place”,them ,in,their~storage.box or on, ,.
,---
1) the pede’stal~of,the.cqpier, ‘_
_“)” _“’ :““*^‘^,3 ,‘, I.__

1. GENERAL DESCRIPTION -
V. WARNING INDICATOR AND
REQUIRED ACTION
A. Jam Indicatorh
If an area of this indicator flashes while
copying is taking place, it is likely that the
paper has jammed at the position repre-
sented by the part that is flashing. Check
and take action as follows.
Sorter JAM indicator
Feeding unit indicator
Figure 1-7
When clearing a paper jam which has
occurred in an option unit (sorter or ADF),
refer to the SERVICE MANUAL for the
option unit.
l Multifeeder indicator
* ADF unit document JAM indicator
- Copier paper JAM indicator
l Right door OPEN indicator
l Feeding unit indicator
- Sorter JAM indicator
If paper jams inside the copier, check
the paper pick-up area, separation feeder
area, fixing/copy delivery area, and cartridge
area; and remove all jammed paper.’
1) Open the front door.
2) Remove the copies from the copy tray.
3) Operate the release and open the copy
delivery assembly.
4) Check if there is copy paper jammed in
the fixing assembly. If there is paper
jam in it, turn the knob of the fixing
rollers counterclockwise to remove the
jammed paper.
Figure 1-8
Close the copy delivery assembly.
Check if there is paper jammed in the
separation/feeder area. If there is,
swing the feeder release lever counter-,
clockwise to open the feeder, then
remove the jammed paper. Be careful
not to tear the paper.
Note-: ’ ,I,:-‘ .“, “, ;’ ‘” :I^“,” ((1;;,;,;
When removing jammed paper from the’1
:separation ‘area,. be very careful not,$
touch the photbsehsitivedrum.~ :(
(. S_” ,“I,/;
Figure 1-9

7) Open the multifeeder cover, and
remove the paper from the multifeeder
tray.
8) Hold the grip found at the bottom of the
multifeeder cover, and open the right
door; then, remove the jam.
Figure l-10
9) Close the right door.
Figure l-11
-10) Close the front door.
B. Add Paper Indicator& ,’
1. Cassette
The indicator goes ON when no ‘\
cassette is found in the cassette holder or
no paper is found inside the cassette.
1) Push the center of the cassette.
- The cassette springs out automati-
cally.
,_--
Figure l-l 2
2) Set copy paper inside the cassette.
* As many as 250 sheets of copy
paper (80 g/m*) may be set.
Figure I-13
3) Hold the center of the cassette, and
slide it into the cassette holder until it
stops.
2. ~Multifeeder
The indicator goes ON when the paper
on the multifeeder tray is not positioned
correctly or the multifeeder cover is left
open.
. As many as 50 sheets of copy paper
(80 iglmz) may be set on the multi-
feeder tray.
1-12

C. Add Toner Indicator&
This indicator flashes when the amount
of toner in the black developing assembly
has become low.
1.
:;
3)
4)
5)
3)
7)
8)
2,
ii)
12)
13)
Black developing assembly
Open the front door.
Turn the developing assembly release
lever counterclockwise.
Pull the developing assembly forward
as far as possible.
Open the top cover of the developing
assembly.
Shake the toner cartridge back and
forth about 10 times.
Place the toner cartridge on the
developing assembly.
While holding the toner cartridge in
place, remove the seal slowly to allow
the toner to flow out.
Figure l-14
Tap the top of the toner cartridge to
remove any toner remaining in the
cartridge.
Carefully remove the toner cartridge.
Close the top cover of the developing
assembly.
Put the developing assembly back into
the copier.
Swing the developing assembly release
lever clockwise.
Close the front door.
2. CT Unit (color developing unit)
If copy images become faint, the color ~
toner has probably run out. In this case,
replace the CT Unit. The copy image can
sometimes be temporarily restored by
agitating the CT Unit in its storage box.
The ‘CT :unit is‘ a &sjras&fe’ type. Wheh i
’ the color toner has be&n used up, toner ii.:
not a&fad to the dT.Unit; rather, the entfr&
unit is replaced: ;, ,”
_, ^, ‘,‘( _I,,;IIibii
D. Control Card Indicator IEB
The control card indicator operates on
a copier with a control card unit. It flashes in
the following cases:
4
b)
When-there is no control card in the
control card unit.
When there is a control card in the
control card unit but the indication on
the control card unit is ‘P’ or ‘EE’.

I 1. GENERAL DESCRIPTION
VI. DAILY INSPECTION TO BE PERFORMED BY
THE CUSTOMER
Carefully instruct the customer to be
sure to clean th’e following parts of the
copier once a week.
1. Primary Corona Assembly
Slide in and out the wire cleaner to
clean the corona wires.
2. Copyboard Glass
Clean the copyboard glass with a moist
cloth, then wipe it dry.
3. Copyboard Cover
Clean the copyboard cover with a mild
detergent solution, then wipe it dry.
4. Transfer Corona Assembly
Remove the transfer corona assembly
from the copier, then slide the knob
(wire cleaner) at the bottom of the
transfer corona assembly back and
forth to clean the corona wires.
Further, clean the static eliminator
using the cleaning brush (accessory).

2. COPYING PROCESS -
,,_~, I. IMAGE FORMATION
(/ PROCESS
A. Outline
$,_- - _+-.+
Primary corona assembly _ Developing
.r>
Figure 2-1

- 2 COPYING PROCESS
Electrostatic latent image formation block
~------__-_-- ------ --7
2. Primary corona
+ Direction of rotation of drum
/_. \
Figure 2-2
This copier consists of the units shown Step 3: Image exposure
in Figure 2-l. Step 4: Developing (positive plus AC)
The image forming process is divided Step 5: Transfer (negative DC)
into the right steps shown below. Step 6: Separation
Step 1: Preexposure Step 7: Fixing
Step 2: Primary corona (negative DC) Step 8: Drum cleaning

,-..\
2. COPYINGPROCESS0
The outer surface of the photosensitive
drum is a layer of organic photoconductor
(OPC). The base is an aluminum (conduc-
tive) cylinder.
Photoconductive
layer
Base
Figure 2-3
B. Electrostatic Latent Image
~ Formation Block
i i/.-- \ This stage consists of three steps. At
the end of the stage, the drum has a pattern
of negative electrical charges on its surface
corresponding to the dark parts of the
document image. The light areas of the
document image are represented on the
drum by the absence of charges.
The pattern of negative charges cannot
be seen by the eye, hence it is called an
electrostatic latent image.
Of- Time(1)-
Darkarea
Figure 2-4
C. Step 1 Pre-Exposure
Figure 2-5
Before the primary corona step, light
from the pre-exposure lamp is shone onto
the surface of the drum (pre-exposure). This
process eliminates residual charges and’
helps to make the density of the copy even.
D. Step 2 Primary Corona
Primarycoronaassembly
Figure 2-6
The primary corona (negative) applies
a uniform layer of negative charges over the
drum surface.
The drum surface potential is deter-
mined bv the arid ootential. The grid is
connected to ground through
which holds the drum potential
the varistor break-down voltage.
a varistor,,
constant at

- 2. COPYING PROCESS
E. Step 3 Scanning Exposure
Optical image
Figure 2-7
Light from the original is projected onto
the drum surface. Charges in these light
areas on the drum are neutralized by drum
photosensitive effects.
F. Step 4 Developing
} $$Jp’“Q
Figure 2-8
As shown in Figure 2-8, the developing
assembly consists of a developing cylinder
(a stationary magnet surrounded by a
rotating sleeve) and a blade made of
magnetic material. Black toner is a single
component type consisting of a fine powder
of mixed magnetite and resin binder. The
toner has insulating properties and is
charged to a positive potential by friction
with the rotating cylinder.
Color developer is a two-component
type consisting of iron powder (carrier) and
toner mixed together in a fixed ratio. The
main component of the toner is resin. The /---
toner is charged to a positive potential and ,
the iron powder to a negative potential by ’
friction with the rotating cylinder.
Figure 2-9
A concentrated magnetic field develops
between the magnet and the edge of the _
blade. This field attracts the charged
developer.
The developer is held virtually immobile
by the magnetic field, forming a curtain
along the edge of the blade. As the cylinder
rotates, this curtain skims the toner particles
on its surface to a thin uniform layer.
An AC bias plus a negative DC bias are
applied simultaneously to the developing
cylinder so that the waveform of the
developing bias has a larger negative
excursion than positive.
.q++fjyg
DC bias
Figure 2~10
During copying toner is attracted to the
drum by the charges on the drum surface
and by repulsion due to the developing bias
(during the positive excursion), transforming
the latent electrostatic image into a visible
image. Excess toner particles are attracted
back to the cylinder from the drum due to
the charges on the drum surface and the
developing bias (during the negative
excursion).
The DC bias affects copy density and _’
fogging: As the DC bias becomes less
negative (approaching OV), the density and _
degree of fogging both increase.

2. COPYING PROCESS -
( G. Step 5 Transfer
,? H. Step 6 Separation’
Transfer coro”a g\
4 Static charge
eliminator
i “-\ Figure 2-l 1 Figure 2-12
In this step, a negative corona is The copy paper is separated from the
applied to the back of the copy paper, drum by utilizing its stiffness. Thin paper,
attracting the toner from the surface of the however, is not stiff, and may wrap around
drum to the copy paper. the drum instead of separating from it. To
prevent this, a positive voltage is applied’to
the separation static charge eliminator,
weakening the attraction between the drum
and the copy paper. This enables the paper
to separate easily from the drum.