Canon NP-2120 User manual

SERVCE
MANUAL
(for 220/24OV]
REVN~N 2
._
canon
DEC. 1992
FY8-13AM-020
COPYRIGNI 0 1992 CANON ING. CANON NPZl20/2020
REY.2 LIEC. 1992 PRINTEO IN JAPAN {IMPRIME AU JAPONI d
L- __-- -.. - .)_

COPYRIGHT 0 1992 CANON INC.
Printed in Japan
Imprime au Japon
TI ”
disclosure of confidential in-
Prepared by
COPYING MACHINE TECHNICAL INFORMATION DEPT. .
COPYING MACHINE TECHNICAL INFORMATION DIV.
CANON INC.
890.12, Kashimada, Saiwai-ku, Kawasaki-shi, Kanagawa 211 Japan
COPYAIGHT 0 1992 CANON IHC. CANON
NP212012MO REY.1 JAN.1992 PAINTEU IN JAPAN IIMPAIME AU JAPUNI d

INTRODUCTION
This SERVICE MANUAL is intended to provide the serviceman with a basic knowledge of the NP21 20/2020
and has been compiled to serve as a handy referente for his work in the field.
The NP21 20/2020 is designed to accommodate the following for fully automated copy work:
1. Sorter-Al, MS-AI
2. ADF-AI
3. Paper Deck Pedestal
4. Control Card V
A separate service manual is made available for the Sorter-Al, MS-Al, ADF-Al, and Control Card; see the
respective manuals for discussions of each.
In CHAPTER 1 GENERAL DESCRIPTION, a brief discussion of the NP2120/2020’s features, diagrams of
its parts, and an explanation of its operation are given.
CHAPTER 2 COPYING PROCESS deals with the innerworkings of the NP2120/2020 which are associated
with the generation of copies.
CHAPTER 3 OPERATIONS AND TIMING explains how the NP2120/2020’s electrical and mechanical
systems are related to each other with respect to functions and timing of operations.
In CHAPTER 4 MECHANICAL SYSTEM. the NP2120/2020’s mechanical system is discussed as to its
operation. disassembly, reassembly, and adjustment.
CHAPTER 5 INSTALLATION gives step-by-step instructions for installing the NP2120/2020 together with
checks to make for each step.
CHAPTER 6 MAINTENANCE AND SERVICING contains tables of replacement parts and consumables.
In addition to the above chapters, this SERVICE MANUAL contains a set of appendixes consisting of a
general timing chart and general circuit diagrams.
A separate document entitled SERVICE HANDBOOK is also available for troubleshooting problems in the
NP2120/2020.
Note:
The contents of this manual may be updated from time to time to reflect improvements rendered to the NP2120/
2020; a Setvice Information Bulletin will be issued as necessary to cover majar changes.
All servicemen are expected to be thoroughly familiar with the information contained in this manual, SERVICE
HANDBOOK, and Service Information Bulletins, for quick response to the user’s needs.
COPYAIGHT Cc 1992 CANON INC. CANON
HPZlZO/ZMO RN.1JAH. 1592 PAIHTED IN JAPAH IIMPAIME AU JAPONI

SERVICE INFORMATION
Issued by Copying Mach& Quallty Assurance Cerner. Canon Inc
MOOEL:
NO. : F-E92-043
DATE: 1992, DEC.
LOCATION
SUBJECT
Document Release
NP2020 SERVICE MANUAL For 220/24OV
The SERVICE MANUAL for the NP2020 has been revised to accommodate the
introduction of the NP2120.
AH those concemed are hereby requested to discard the old SERVICE MANUAL
and use the document attached for purposes for which the document is intended.
FY8-13AM-02Y
Printed in Japan
Imprimé au Japon

REVISIONPAGELIST
R: Replacement,
S: Supplement, MODEL : NP21 20/2020
D: Destroyed,
Page 1
CHAP
rm PA
RJZVISION
CHAP
REVISION
GE
MAY JAN. DEC.
rm PA
GE MAY JAN. DEC.
1990 1992 1992 1990 1992 1992
1 1 0 + 1R 3 3 0 + 1R
3 lo++ 31 0 + -t
2 0 -t + 32 0 + +

REVISIONPAGELIST
R: Replacement,
S: Supplement,
MODEL : NP2 120/2020
D: Destroyed,
Page 2
CHAP
REVISION
CHAP
.JXR PA
I-ER PA
REVISION
MAY JAN. DEC.
GE 1990 1992 1992 MAY JAN.
DEC.
GE 1990 1992 1992
3 33 0 1R + 3 58 0 -t 1R
34 0 1R +
35 0 -t +
36 0 + -t 41 0 + 1R
37 0 + + 2 0 -t 1R
38 0 1R -t 3 0 1R -t
39 0 + -t 4 0 1R +
40 0 -t + 5 0 1R -f
41 0 + -t 6 0 + 1R
42 0 -t + 70++
42a - - os so++
42b - - OS
>
90++
43 0 1R + 10 0 1R -t
44 0 -t 1R 11 0 -t -t
45 0 + 1R 12 0 + +
46 0 -t 1R 13 0 + -t
47 0 -t -)
47a - - OS
47b - - OS
47c - - os
LS
48 0 -t +
49 0 + + 17 0 -f +
50 0 + -t 18 0 + -t
51 0 + + 19 0 + +
52 0 -t + 20 0 + -P
53 0 -t + 21 0 + -t
54 0 + 1R 22 0 + +
55 0 1R + 23 0 -t -t
56 0 + + 24 0 -t +
57 0 1R 2R 25 0 + -+

REVISIONPAGELIST
R: Replacement,
S: Supplement,
MODEL : NP2 120/2020
D: Destroyed,
Page 3
20 - OS 1R

REVISIONPAGEL
I S T
R: Replacement,
S: Supplement,
MODEL : NP2120/2020
D: Destroyed,
Page 4
23 - OS 1R
24 -
OS 1R
24a - - OS
24b - - OS
25 0 + -t
26 0 + +
27 0 -t +
28 0 -t +
29 0 -f +
30 0 -t +
31 0 -t 1R
32 - - -
33 0 + +
34 0 -t -t

REVISIONPAGELIST
R: Replacement,
S: Supplement,
D: Destroyed,
MODEL : PAPER DECK PEDESTAL-Cl
Page 5
2 1P 0 ++
2P 0 -t +
3P 0 + +
4P 0 + +
5P 0 1R +
6P 0 -t +
7P 0 + -t
8P 0 -t +
3 1P 0 +
+
2P 0 -p +
3P 0 + +
4P 0 + +
5P 0 + -t
6P 0 -t +
7P 0 + +
4 1P 0 +
+
A 1P 0 -t +
2P 0 + +
3P 0 + +
4P - --
5P 0 + +

1. FEATURES
............................................ 1-I D. Using the Manual Feed Tray
II. SPECIFICATIONS .................................
I-2
(NP2120) ..........................................
l-10
A. Type .................................................
I-2
E. Making Two-Sided Copies
............... 1-I 0
B. Construction ..................................... I-2 F. Making Overlay Copies. ...................
1-l 1
C. Pefformance .................................... I-3
G. Replacing the CT Unit
....................... 1-i
1
D. Others .............................................. I-4 H. Using the COPV DENSITY
III, NAMES OF PARTS ............................... I-7 CORRECTION
Lever.. ......................
I-l 1
A. Externa1 View ................................... I-7
1. Atuo-Start (NP2120) .........................
I-lla
B. Cross-Sectional View
.......................
I-8 V. WARNINGS AND ACTIONS TO TAKE l-12
IV. OPERATION .......................................... I-9 A. JAM Indicator ( 8% ) ‘........................ I-12
A. Control Panel ................................... I-9 B. ADD PAPER Indicator ( & )
...........
l-12a
B. Making Copies ................................. l-10 C. ADD TONER Indicator ( h )
..........
I-13
C. Using the Manual Feed Tray
... l-13
(NP2020)
D. CONTROL CARD Indicator (w)
.......................................... l-10
E. @glndicator..
................................ l-13
VI. ROUTINE WORK BV THE USER ..........
l-14
1, IMAGE FORMATION PROCESS
.......... 2-1
II. AUXILIARY PROCESSES
.....................
2-6
A. Outline ...............................................
2-1
A.
Blank Exposure Mechanism
............ 2-6
B. Ozone Filter .....................................
2-6
1. BASIC MECHANISMS ...........................
3-1
G. Developing Assembly and Drum
A. Functional
Construction
...................
3-l Cleaning Unit ...................................
3-36
B.
Electrical Circuitry ............................
3-2
H.
Blank Control ...................................
3-37
C.
Inputs lo DC Controller
.................... 3-4
1.
Controlling the Transfer Corona
D.
Outputs from DC Conlroller
............. 3-8 Wire Cleaning Mechanism ............... 3-38
E. Basic Sequence ...............................
3-I 1 IV.
PICK-UP/FEED SVSTEM ......................
3-39
ll. EXPOSURE SVSTEM ...........................
3-13
A. Outline..............................................
3-39
A.
Varying the Reproduction Ratio..
.....
3-13
B. Identifying the Cassette Size
........... 3-43
B. Lens Drive Syiem .............................
3-14
C. Fixing Assembly and Delivery
C. Scanner Drive System
..................... 3-18
Assembly .........................................
3-44
D.
Document Size Identification
...........
3-21
D. Error Detection Circuit (NP2020)
.....
3-47
III. IMAGE FORMATION SVSTEM
.............
3-24 E. Error Detection
Circuit (NP2120)
.....
3-47a
A. Outline.............................................. 3-24 F. Jam Detection ..................................
3-48
B. Basic Sequence of Image V. POWER SUPPLV ...................................
3-52
Formation .........................................
3-25 A.
DC Power Supply.............................
3-52
C.
Controlling the Scanning Lamp..
......
3-26
B.
DC Power Supply for Options
.......... 3-53
D. Controlling the Primaryflransfer VI. SERVICE MODES .................................
3-55
Corona Current and the Grid Bias
A.
Outline..............................................
3-55
Voltage .............................................
3-28 B.
Using the Service Mode
................... 3-56
E.
Controlling the Development Bias..
..
3-30 VII. SELF DIAGNOSTIC MECHANISM
........
3-57
F.
Measuring the Document Density..
..
3-33
COPYAIEHT 0 1992 CANONING. CANON NP2120/2020
RN.1 DLC. 1592 PRIHTEO IN JAPAN [IMPRIME AU JAPONI

1, EXTERNALS .......................................... 4-f
A. Externa1 Covers ............................... 4-I
B. Control Panel ................................... 4-5
C. Copyboard Cover ............................. 4-5
D. Fans ................................................. 4-5
II. DRIVE SVSTEM ....................................
4-7
A. Lens Drive Unit ................................ 4-7
B. Scanner Drive Unit ........................... 4-9
C. Main Motor Unit ................................ 4-12
III. FEEDSVSTEM ....................................... 4-13
A. Pi&Up Unit ..................................... 4-13
B. Feeder Unit ...................................... 4-16
IV. EXPOSURE SYSTEM . ..____._..._______....,.,, 4-18
A. Illuminating Unit ___...._._._._._.___.........,, 4-18
B. Blank Exposure Unit . . . . . . . . . . . . . . . 4-19
v. CORONA SVSTEM _.......___.___.._._..........., 4-21
A. Drum Unit . . . .._................................... 4-21
B. Primarv and Transfer
Coroná Units . . . . . . . . . . . . . . . . . . . . .
4-22
VI. DEVELOPMENT SVSTEM _..__._..........,.. 4-25
A. Developing Assembly
. . . . . . . . . ..__.. 4-25
VII. FIXING SVSTEM . . . . . . . . . . . . . . . . . . . .
4-28
A. Fixing Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-28
LOCATION
.............................................
5-I
E. Checking the Image ......................... 5-7
UNPACKING AND INSTALLING III. SETTING THE CASSElTE SIZE
.......... 5-8
THE COPIER ......................................... 5-2
IV. SEnlNG THE CT UNIT ........................ 5-13
A. Unpacking ........................................ 5-2 V. RELOCATING THE COPIER
................. 5-14
B. Mounting the Dium .......................... 5-4a
VI. SETTING CONTROL CARD V .............. 5-15
C. Checking the Operation ................... 5-5
VII. ATTACHING THE DOCUMENT
D. Adding Toner ................................... 5-6 HOLDER
................................................ 5-I 7
1. PERIODICALLV REPLACED PARTS.... 6-1 III. PERIODICAL SERVICING
___....._____...._., 6-3
ll. CONSUMABLES <.<,...___.......................... 6-2 IV. PERIODICAL SERVICING CHART
.,,.._, 6-4
1.
2.
3.
4.
5.
6.
7.
GENERAL TIMING CHAR-r.. ................. A-l
8. DC POWER SUPPLV FOR OPTIONS .. A-27
SIGNALSAND ABBREVIATIONS .......... A-3
9. ADJUSTING PCB .................................. A-28
GENERAL CIRCUIT DIAGRAM ............. A-5 10. PRE-EXPOSURE LAMP ........................
A-29
WIRING DIAGRAM ................................ A-6
11. AE SENSOR .......................................... A-30
DC CONTROLLER PCB ........................ A-ll
12. HVT ........................................................ A-31
MOTOR DRIVE PCB ............................. A-25
13. LIST OF SPECIAL TOOLS .................... A-33
DC POWER SUPPLV PCB .._....<......... A-26 14. LIST OF SOLVENT AND MATERIAL A-34
COPYAIGHT G 1992 CANOH IHC. CANONNP2120/2MO
RB.1 OEC.1992 PRINTEO IH JAPANIIMPAIME AU JAPONI

System Configuration
The NP21 20/2020 is designed lo accommodate the following for fully automated copy work:
ADF-Al
A stack of documents may be placed for automatic
pick-up and feed.
Sorter-Al
Upto 20 copies may be automatically sorted or
grouped by page.
MSAl
Up lo 10 copies may be automatically sorted or
grouped by page.
Control Card V
With the card. the volume of copy work
may te put under watch.
I
Paper Deck Pedestal
\-
Q-rl
Stapler Sorter-B2
Up to 10 sets of copies
may be automaiically
sorted and stapled.
Further, sorted copies
may be automatically
stapled.
COPYRICHT G 1592 CANON INC. CANON NP2120/2020 REY.1UEC. 1992 PRINTEO IN JAPAN IIMPAIME AU JAPONI
Stapler Sorter-Bl
Up to 10 sets of copies
may be automatically
sorted. Further, copies
may be automatically
sorted and then stapled in
sequence.

CHAPTER 1
GENERAL DESCRIPTION
1.
FEATURES.. I-1 V. WARNINGS AND ACTIONS .........................................
II.
SPECIFICATIONS ................................ 1-2 TOTAKE .............................................. I-12
III. NAMES OF PARTS .............................. l-7 VI. ROUTINE WORK BY THE USER.. ....... 1-14
IV. OPERATION......................................... 1-9
COPYRIGNT 0 1992 CANONING. CANON NPZl20/2MO KV.0 MAY1990 PAINTEU INJWAN IIMPRIME AU JAPONI

l.GENERALDESCRIPTION BW3
1. Front-loading.
- Thecopier is designed to aCCept cassettes from the frOnt for ease of use (two cassettes holding 250 sheets
each).
- The copier is given two cassette holders, thereby eliminating the need forcassetle replacement in making
copies of different sizes.
- The copier’s multifeeder allows you to feed multiple postcards (NP21 20)
2. Full line of auto mechanisms.
- 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.
- Thecopier’s auto-stafifeature lest you press the COPY START key during the wait period so thatthe copier
will start making copies as soon as it becomes ready (NP2120).
3. HQ jumping toner.
* The copier uses Canon? own HQ (high quality) jumping toner for reproduction of clear characters and
photos.
- The toner is of a single-component type, which provides stable images.
- In addition, a 30-dia. high sensitivity OPC drum is used to enable enhanced image reproduction and a
compact copier design.
4. Man-machine interface.
- As many as 21 copies (A4, landscape) may be made per minute.
. The zoom mechanism allows reduction down to 50% and enlargement up to 200% of the original image.
- The page separation mode serves to speed up copying book-form documents.
- The copier accepts documents as small as a postcard oras large as A3.
- With the CT unit (option), the copies may be in red, green, blue, or brown.
5. Avariety of options to choose from for full automation.
The copiercommunicates with its options at a higher speed than ever, resulting in more output pergiventime’.
* With options, up lo 21 copies/min; 1:l (A4, landscape).
- ADF-Al for automatic document feed.
- Sorter-Al for automatic sorting and grouping (20 bins).
- MS-Al for automatic sorting and grouping (IObins).
- Control Card V (configured as built-in) for copy volume control (up to 200 depts.).
- Stapler Sorter 1 O-BI for stapling copies sorted in its ten bins.
COPYAIOHT D 1592 CANON INC. CANONNPZK?O/ZMO RN.1 OEC. 1992 PAINTEO IN
JAPAN [IMPRIME AU JAPONI d
l-l

i.GENERAL DESCRIPTION
Pa. Type
Body
Copyboard
Light source
Desktop
Fixed
Halogen lamp 1 OO/1 15V model 300W
220124OV model _._ 330W
Lens
Zoom lens
Photosensitive medium OPC
ES. Construction
Copying
Indirect static photocopying
Charging Corona
Exposure Slit (moving light source)
Copy density adjustment Automatic
(AE) or manual
Development
Dry
Pick-up Automatic 2 cassettes; multifeeder (NP2120)
Manual
Manual feed tray (NP2020)
Transfer Corona
Separation Curvature and Static eliminator
Cleaning Blade
Fixing Heat roller (900 W)
1-2
COPYRIGHT 8 1992 CANONING. CANONNPZl20/2020 AN.I OEC.1992 PAINTEO IN JAPAN IIMPAIME AU JAPONI

C. Performance
Document type
Jocument size (max.)
qeproduction ratio
Nait time
?rst copy
:ontinuous copying
Zopy size
:~PY we
:assette
Cassette
Manual feed tray
“;alc,,,
:opy tray
don-image width
\uto clear mechanism
iuto shut-off mechanism
iuto starl
COPYAIGHT 6 1992 CANONING.
See Table l-1 ; 50% to 200%, zoom.
90 sec or less (20°C/680F)
9 sec or less
1 to 99 copies
A3/LDG (297 x 431.8 mm) max. (11 in x 17 in)
Postcard (100 x 148 mm) min. (3.9 in x 5.8 in)
Plain paper (64 to 80 g1m2), Tracing paper (SMI), Colored paper
Plain paper (64 to 128 g/m2), Tracing paper (SMI, GNT80’).
Colored paper, OHP film, Postcard, Label
* NP2020 only.
Plain paper (64 to 128 g/m’), Colored paper, OHP film
(overlay only), Postcard
Sheet. Book, 3-D object (2 kg14.4 Ib max.)
A3 (297X420 mm)/LDG (1 l”X17”)
Claws, Front loading; 250 sheets (approx.) of 80 g/m2
99 sheets (80 g/m2)
2.0 mmI0.08 in (leading edge), 2.5 mm/O.l in (left/right)
Provided. (2 min, standard; may be disabled)
Not provided.
NP2120 only.
Sorter-Al, MS-Al, Paper Deck Pedestal, Control Card V,
CT Unit, Stapler Sorter-BI, Stapler Sorter-62
CANONNP2120/2020 REY.1 OEC. 1992 PAINTED IN JAPAN IIMPRIME AU JAPONI
l-3

- I.GENERALDESCRIPTION
B. Others
l-4
COPYRIGNT 0 1992 CANON INC. CANON
NPZl20/2MO NH.2 DEC. 1992 PRINTEO IN JAPAN IIMPRIME AU JAPONI d

l.GENERALDESCRIPTION m
100/220/24OV
115v
220/240 V
DIRECT REDUCE ENLARGE
1: 1 (kO.5%)
1 : 0.500 (kl .O%)
1 : 1.154(+1.0%)
1 :0.700 (d.O%)
1 : 1.224(fl.O%)
1 :0.816 (d.O%)
1 : 1.414 (fl.O%)
1 :0.865 (fl.O%)
1 :2.000 (kl.O%)
1: 1 (?0.5%)
1 :0.500(*1.0%)
1 :1.214(+1.0%)
1 :0.647 (il.O%)
1 : 1.294(*1.0%)
1 :0.773 @l.O%)
1 :2.000 (*l.o%)
1 :0.786(+1.0%)
1 :1 @0.5%)
1 :0.500 (*l.o%)
1 : 1.414
(kl.O%)
1 : 0.707(+1.0%)
1 :2.000 (kl.O%)
Table I-l Fixed Reproduction Ratio
Table l-2 Copy Speed
COPYNIGNT t? 1992 CANON INC. CANON NPZl20/ZMO
NN. MAY1990 PRINTEO IN JAPAN IIMPNIME AU JAPON)
1-5

Table l-3 Paper Size
1-6COPYAIGNT
0 1592 CANON INC. CANON NPZl20/2020 RN.0 MAY 1990 PRINTEO IN JAPAN IIMPNIME AU JAPON]