Konica 7920 Wiring Diagram df331e
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
DF-331
SERVICE MANUAL
11563
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
CONTENTS
GENERAL,
MECHANICAL/ELECTRICAL
1. SPECIFICATIONS ........................................................................................... M-1
2. COMPONENT IDENTIFICATION .................................. ........................... .......M-3
3. CROSS-SECTIONAL VIEW ............................................................................M-4
4. DRIVE SYSTEM ..............................................................................................M-5
5. ELECTRICAL COMPONENT LAYOUT ...........................................................M-6
6. DESCRIPTION OF MODES ............................................ .............. ..................M-7
6-1. Mixed Original Mode . ...............................................................................M-7
6-2. 1-Sided Mode ..........................................................................................M-7
6-3. 2-Sided Mode ..........................................................................................M-7
6-4. Single Feed Mode ....................................................................................M-7
7. DOCUMENT TAKE-UP/FEEDING MECHANISM ............................................M-8
7-1. Parts Identification ...................................................................................M-8
7-2. Document Pick-Up Mechanism ...............................................................M-9
7-3. Document Take-Up Mechanism ..............................................................M-11
8. DOCUMENT TRANSPORT MECHANISM ......................................................M-13
8-1. Parts Identification ................................................................................... M-13
8-2. Document Transport Mechanism .............................................................M-13
9. TURNOVER/EXIT MECHANISM .....................................................................M-15
9-1. Parts Identification ................................................................................... M-15
9-2. Document Transport Mechanism .............................................................M-15
9-3. Turnover/Exit Switching Mechanism ........................................................M-17
10. SCALE DRIVE MECHANISM ..................... .....................................................M-18
10-1.Parts Identification ....................... ............. .... .... ............. .... ............. .... .... .M-18
10-2.Pressing of the Scale Drive Mechanism ..................................................M-18
10-3.Scale Drive Mechanism ...........................................................................M-19
10-4.Thin Paper Mode ....................................................... .... ...... ........... ...... ...M-19
11. MISCELLANEOUS ..........................................................................................M-20
11-1.Document Size Detection Mechanism .....................................................M-20
(1) Document Width Detection ..............................................................M-20
(2) Document Length Detection ............................................................ M-20
(3) Document Size Detection ................................................................M-21
11-2.15° Open Detection Mechanism ..............................................................M-22
11-3.Raised/Lowered Position Detection Mechanism .....................................M-22
TEST MODES
1. OUTLINE OF THE TEST MODES ...................................................................S-1
1-1. Test Mode Setting Procedure ..................................................................S-1
1-2. Types of Test Modes ...............................................................................S-1
2. PAPER PASSAGE CHECK ............................................................................. S-2
2-1. Paper Passage Modes ............................................................................S-2
2-2. Paper Passage Check Procedure ...........................................................S-2
2-3. Indication by LEDs in Paper Passage Check ..................................... .... .S-3
(1) Indication by LEDs in closure failure .......................................... .....S-3
i
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
(2) Indication by LEDs in Misfeed, Trouble and Warning ......................S-3
3. UNIT CHECK ..................................... ............................ ........................... .......S-4
3-1. Unit Check Modes ...................................................................................S-4
3-2. Unit Check Procedure ..............................................................................S-4
(1) Pick-Up Motor check ...................... .................................................S-4
(2) Take-Up Motor check ....................... ........................... ....................S-5
(3) Main Motor check .............. ............................ ........................... .......S-5
(4) Turnover/Exit Motor che ck ................................... ............... .............S-5
(5) Scale Drive Motor check .................................................................. S-6
(6) Turnover Solenoid check .................................................................S-6
4. SENSOR CHECK ................................ ............................ ........................... .....S-7
4-1. Sensor Check Mode ............................................................................... .S-7
4-2. Sensor Check Proc edure ....................................... ........................... .......S-8
(1) Sensor Check 1 check .............. ........................... ............................S-8
(2) Sensor Check 2 check .............. ........................... ............................S-8
5. BOARD CHECK ..............................................................................................S-9
5-1. Board Check Mode .................................................................................. S-9
5-2. Board Check Procedure .......................................................................... S-9
DIS/REASSEMBLY, ADJUSTMENT
1. MAINTENANCE SCHEDULE ..........................................................................D-1
2. DISASSEMBLY ...............................................................................................D-2
2-1. Removal of the Transport Belt .................................................................D-2
2-2. Removal of the Pick-Up Rolls, Take-Up Rolls, and Separator Pads .......D-3
3. ADJUSTMENTS ..............................................................................................D-5
3-1. Adjustment of Ske w in the ADF ............................................. ..................D-5
3-2. Adjustment of the Document Feed Tray Reference Position ...................D-6
3-3. Adjustment of the Single Feed Tray Reference Position .........................D-7
3-4. Adjustment of the Document Stop Position in the 1-Sided and
1-Sided Mixed Original Mode ..................................................................D-8
3-5. Adjustment of the Document Stop Position in the 2-Sided Mode ............D-9
3-6. Adjustment of the Document Stop Position in the Single Feed Mode .....D-10
3-7. Adjustment of Turnover Solenoid ............................................................D-11
TROUBLESHOOTING
1. MISFEED DETECTION ................................ ............... ........................... .........T-1
2. MISFEED TROUBLESHOOTING PROCEDURES .........................................T-3
3. Closure Failure Detection ................................................................................T-7
4. Time chart .................................... ............... ........................... ..........................T-8
4-1. 1-Side Original Mode ...............................................................................T-8
4-2. Mixed Original Mode ................................................................................T-9
4-3. 2-Side Original Scanning Mode ...............................................................T-10
4-4. Single Feed Mode ....................................................................................T-11
ii
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
GENERAL,
MECHANICAL/ELECTRICAL
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
1. SPECIFICATIONS
Name : Duplexing Document Feeder
Type : Paper Take-Up : Take-up from top of stack, U-turn feeding
Installation : Mounted on the copier
Type of Document : Plain paper : 1-Sided mode - 50 g/m² to 110 g/m²
Detectable Document
Sizes
Capacity : Document Feed Tray: 50 sheets -- 80 g/m²
Alignment : Rear Document Edge Guide
Document Loading : Face up
Modes : Mixed Original
Power Source : DC 24 V -- supplied from the copier
Power Consumption : 60 W or less
Dimensions : Width 603 mm
Weight : 12.0 kg
Operating Environment : Same as copier
Transport : Single-belt transport
Turnover : Loop turnover
Ejection : Straight ejection
2-Sided mode - 60 g/m² to 90 g/m²
Single Feed mode - 35 g/m² to 200 g/m²
: Metric Area (Standard)
A5 C/L, B5 C/L, A4 C/L, B4 L, A3 L, 11 × 15 L,
8-1/2 × 11 L, 8 × 13 L
Inch Area (Standard)
A4 L, 5-1/2 × 8-1/2 C/L, 8-1/2 × 11 C/L, 8-1/2 × 14 L,
11 × 15 L, 11 × 17 L
Document Exit Tray: 50 sheets -- 80 g/m²
1-Sided
2-Sided
Single Feed
Height 110 mm
Depth 502 mm -- excluding Document Exit Tray
M-1
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
Originals Which Should
Not be Used
Type of Original Possible Trouble
Sheets stapled or clipped together Take-up failure, damaged sheet, defective
Sheets glued together Take-up failure, damaged sheet
Sheets folded, torn, or wrinkled Take-up failure, damaged sheet
Sheets severely curled Sheets mis-fed due to being dog-eared or
Sheets weighing less than 40 g/m² Damaged sheet
Originals for Which Feeding is not Guaranteed
Type of Original Possible Trouble
Pieces of paper pasted up on a sheet Folded or torn pasted-up pieces
Slightly curled sheets: curl 10 to 15 mm Dog-eared pages, ejection failure
Heat-sensitive paper Folded leading edge, ejection failure, trans-
Coated sheets Take-up failure, transport failure
Translucent paper Take-up failure, transport failure
Sheets just fed out of the copier Take-up failure, transport failure
Perforated sheets: loose-leaf, etc. Multiple feed due to burrs in perforations
Sheets with two to four holes Transport failure
Sheets folded in half or Z-folded Transport failure, distorted image
Sheets weighing 40 g/m² to 50 g/m² Folded leading edge
Sheets with surface irregularities:
letterhead, etc.
Pencil-written sheets Dirty originals
Folded sheets Distorted image, multiple feed, take-up
Sheets of a size outside the range detectable by the ADF
: The following types of originals, if used with the ADF, are
very likely to cause trouble.
drive mechanism due to jammed staples or
clips.
fed in askew
: The following types of originals, if used with the ADF, may
or may not cause trouble.
port failure
Take-up failure
failure
Void image
M-2
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
2. COMPONENT IDENTIFICATION
1
8
9
10
2
3
4
7
11
5
4490M001AA
6
1. Hookup Cord
2. Rear Cover
3. Document Feed Tray
4. Upper Cover
5. Single Feed Tray
6. Take-Up Cover
7. Document Edge Guide
13
12
4652M501AA
8. Exit Cover
9. Document Exit Tray
10. Transport Belt
11. Magnet
12. Holder Touch Lever
13. Scale Drive Lever
M-3
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
3. CROSS-SECTIONAL VIEW
22
21
20
17
19
18
1. Pick-Up Roll
2. Empty Sensor PC1
3. Take-Up Roll
4. Separator Pad
5. Registration Sensor PC2
6. Registration Driven Roller
7. Registration Drive Roller
8. Single Feed Empty Sensor PC9
9. Single Feed Roller
10. Single Feed Roll
11. Width Sensor 1/2/3 PC5/6/7
12. Transport Belt Drive Roller
13. Transport Belt
16
15
2423
25
14
14. Transport Rolls
15. Transport Belt Driven Roller
16. Transport Roll
17. Turnover Roller
18. Exit Sensor PC3
19. Exit Roller
20. Exit Roll
21. Turnover/Exit Switching Plate
22. Turnover Roll
23. Turnover Sensor PC4
24. Turnover Roll
25. Transport Roller
123456
13
7
8
9
10
11
12
4652M502AA
M-4
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
4. DRIVE SYSTEM
Document Transport
Turnover/Exit/Scale Drive
Document Take-Up/Feeding
4652M503AA
M-5
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
5. ELECTRICAL COMPONENT LAYOUT
M2
SL1
PC11
M4
PC3
PWB-A
M5
PC8
M1
M3
PC4
PC12
PC1
PC9
PC2
PC10
PC5
PC6
PC7
4652M504AA
Code Name Code Name
PWB-A
M1
M2
M3
M4
M5
SL1
PC1
PC2
PC3
PC4
Main Control Board
Pick-Up Motor
Take-Up Motor
Main Motor
Turnover/Exit Motor
Scale Drive Motor
Turnover Solenoid
Empty Sensor
Registration Sensor
Exit Sensor
Turnover Sensor
PC5
PC6
PC7
PC8
PC9
PC10
PC11
PC12
Paper Width Sensor 1 (Option)
Paper Width Sensor 2
Paper Width Sensor 3 (Option)
Pick-Up Sensor
Single Feed Empty Sensor
Take-Up Cover Open/Close
Sensor
Exit Cover Open/Close Sensor
Scale Drive Sensor
M-6
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
6. DESCRIPTION OF MODES
6-1. Mixed Original Mode
• The copier detects the size of each page of the document as it is taken up and fed in and,
according to the size detected, feeds the copy paper of the corresponding size selected
from among the available paper sources.
• The mode is mainly used when making copies from a document set consisting of pages
of different sizes.
6-2. 1-Sided Mode
• When a multi-page document is being copied, the copier detects the size of only the first
page of the document and copies the subsequent pages based on that size detection.
• This saves the copier the time required for detecting the sizes of the subsequent pages
of the document, making for a faster and more efficient paper feed timing.
NOTE
If a document of pages of varying sizes is used in this mode, image trouble could result
including missing copy image. (The system does not, however, force a misfeed condition.)
6-3. 2-Sided Mode
• The ADF automatically turns over 2-sided originals for a speedy copying operation (copies are made in the order of the first and second pages).
6-4. Single Feed Mode
• This mode may be used when the user wants to make copies from an original for which
feeding is not guaranteed (pasted-up sheet, translucent paper, heat-sensitive paper,
etc.).
• When a single original is inserted into the Single Feed Tray, the ADF automatically takes
it up and feeds it in to let the copier run a single copy cycle.
• Each original is transported at a low speed.
M-7
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
7. DOCUMENT TAKE-UP/FEEDING MECHANISM
7-1. Parts Identification
1
16
15
14
13
12
1. Take-Up Motor M2
2. Empty Sensor PC1
3. Single Feed Roller
4. Single Feed Empty Sensor PC9
5. Registration Roller
6. Registration Sensor PC2
7. Paper Width Sensor 1 PC5: Option
8. Paper Width Sensor 2 PC6
9. Paper Width Sensor 3 PC7: Option
2
3
4
5
11
10
10. Take-Up Cover Open/Close Sensor
PC10
11. Take-Up Rolls
12. Separator Pads
13. Pick-Up Rolls
14. Document Stoppers
15. Pick-Up Sensor PC8
16. Pick-Up Motor M1
6
7
8
9
4652M505AB
M-8
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
7-2. Document Pick-Up Mechanism
• The document pick-up mechanism consists of the Document Stoppers and Pick-Up
Rolls.
• The Document Stoppers determine the leading edge position of the document loaded in
the ADF.
• They are in the lowered position when in their standby position and raised when a document take-up sequence is started.
• The Pick-Up Rolls are in the raised position in their standby state and lowered when a
document take-up sequence is started, pressing the document set downward during the
sequence with the tension of the Document Pressure Springs.
• The operation of the Document Stoppers and Pick-Up Rolls is controlled by Pick-Up
Motor, Pick-Up Sensor, and a cam.
Pick-Up Rolls
Document Pressure Springs
Pick-Up Sensor PC8
Document Stoppers
Pick-Up Motor M1
4490M007AB
M-9
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
✽
Control of Operation of the Document Stoppers and Pick-Up Rolls
Home position
Pick-Up Rolls press document; Document Stoppers
retract.
Home position
PC8 and Cam
Operation
Pick-Up Sensor PC8
Cam
4490M008AA
4652M506AA 4652M517AA
Document Stoppers/Pick-Up
Rolls Operation
Pick-Up Roll
Document Stopper
Document
Pressure Spring
4490M009AA
4490M008AA
✽
Pick-Up Motor Control
CONTROL SIGNAL ON OFF WIRING DIAGRAM
M1 PWB-A PJ8A-2 L H 7 - H
CONTROL SIGNAL Blocked Unblocked WIRING DIAGRAM
PC8 PWB-A PJ12A-2 L H 3 - I
M-10
4490M009AA
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
7-3. Document Take-Up Mechanism
• The Pick-Up Rolls and Take-Up Rolls turn to transport the document loaded in the Document Feed Tray up to the Registration Roller.
• The Single Feed Roller, on the other hand, turns to transport the document placed in the
Single Feed Tray.
• The Pick-Up Rolls, Take-Up Rolls, and Single Feed Roller are driven by Take-Up Motor.
• To drive the Single Feed Roller, Take-Up Motor is turned backward, at which time the
Take-Up Roll Shaft also turns backward. Because of the functioning of the one-way pulley, however, the backward rotation of the shaft is not transmitted to the Pick-Up Rolls or
Take-Up Rolls.
• The Front Separator Pads and Separator Pads together function to prevent double feed
when two or more pages of a document set are taken up.
One-Way Pulley
Take-Up Motor M2
Take-Up Roll Shaft
Pick-Up Rolls
Front Separator Pads
Separator Pads
Take-Up Rolls
Single Feed
Roller
Registration Roller
4490M012AD
M-11
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
✽
Take-Up Motor Control
• The pulse signals output from PJ7A on PWB-A are supplied to the two coils inside TakeUp Motor and the combination and sequence of the pulse signals energized are varied to
turn Take-Up Motor forward or backward.
• The distance over which an original is transported is detected by counting the number of
pulses generated.
PWB-A
PJ7A-5 L H H L
PJ7A-4 L L H H
PJ7A-6 H L L H
PJ7A-3 H H L L
Forward
Rotation
Backward
Rotation
Sequence
1234
M2 PWB-A PJ7A-3~6 Pul se Output 7 - I
Pick-Up Rolls and Take-Up Rolls are turned to take up an
original.
The Single Feed Roller is turned to take up an original.
CONTROL SIGNAL ON OFF WIRING DIAGRAM
M-12
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
8. DOCUMENT TRANSPORT MECHANISM
8-1. Parts Identification
1
4
2
3
4650M507AA
1. Main Drive Motor M3
2. Registration Driven Roller
3. Registration Drive Roller
4. Transport Belt
8-2. Document Transport Mechanism
• Rotation of the Registration Rollers and Transport Belt results in the original fed from the
Document Feed Tray or Single Feed Tray being transported up to the Original Width
Scale.
• The Registration Rollers and Transport Belt are driven by Main Drive Motor.
Main Drive Motor M3
Registration Rollers
Transport Belt
4490M014AA
M-13
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
✽
Main Drive Motor Control
• The pulse signals output from PJ6A on PWB-A are supplied to the two coils inside Main
Drive Motor and the combination and sequence of the pulse signals energized are varied
to turn Main Drive Motor forward or backward.
• The distance over which an original is transported is detected by counting the number of
pulses generated.
• The motor speed is controlled by varying the cycle “A” of the pulse signal.
PWB-A
PJ6A-3 L H H L
PJ6A-5 L L H H
PJ6A-4 H L L H
PJ6A-6 H H L L
Forward
Rotation
Backward
Rotation
Sequence
1234
M3 PWB-A PJ6A-3~6 Pulse O utput 8 - G
A
Transports the original toward the Original Width Scale.
Transports the original, which has been turned over, towards
the take-up section.
CONTROL SIGNAL ON OFF WIRING DIAGRAM
M-14
FrameMaker Ver.5.5(PC) DF-331 OPTION FOR 7915/7920
01.02.09
9. TURNOVER/EXIT MECHANISM
9-1. Parts Identification
Turnover/Exit Motor M4
Exit Cover Open/Close Sensor PC11
Turnover Solenoid SL1
Exit Sensor PC3
Turnover Sensor PC4
Turnover Roller
Exit Roller
4490M015AC
9-2. Document Transport Mechanism
• The Turnover Roller and Exit Roller turn over or feed out of the ADF the original transported from the transport mechanism.
• The Turnover Roller and Exit Roller are driven by Turnover/Exit Motor.
Turnover/Exit Motor M4
Transport Belt
Turnover Roller
Exit Roller
4490M016AC
M-15
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