Konica 7920 Wiring Diagram db431e
FrameMaker Ver.5.5(PC) DB-431 OPTION FOR 7915/7920
01.02.09
DB-431
SERVICE MANUAL
10794
FrameMaker Ver.5.5(PC) DB-431 OPTION FOR 7915/7920
01.02.09
CONTENTS
GENERAL,
MECHANICAL/ELECTRICAL
1. SPECIFICATIONS ...........................................................................................M-1
2. PARTS IDENTIFICATION ........................ ........................... ............................M-1
3. CROSS-SECTIONAL VIEW ............................................................................M-2
4. DRIVE SYSTEM ..............................................................................................M-2
5. ELECTRICAL COMPONENTS LAYOUT ........................................................M-3
6. MECHANISM AND CONTROL ............................... ............................ .............M-4
6-1. Vertical Transport Drive Mechanism ........................................................M-4
6-2. Paper Take-Up Mechanism .....................................................................M-4
6-3. Paper Take-Up Mechanism .....................................................................M-5
6-4. Paper Take-Up Operations ......................................................................M-6
(1) Lift 1 Paper Take-Up Operations .....................................................M-6
(2) Lift 2 Paper Take-Up Operations .....................................................M-8
6-5. Paper Separating Mechanism .................................................................M-11
6-6. Paper Pressure Releasing Mechanism ...................................................M-11
6-7. Paper Take-Up Roll Retracting Mechanism ............................................M-12
6-8. LCC-in-Position Detection ..................................... ..................................M- 1 2
6-9. Edge Guides and Trailing Edge Stop ......................................................M-13
6-10.Paper Size Setting ...................................................................................M-13
6-11.Lifting Mechanism ....................................................................................M-14
(1) Lift 1 and 2 Ascent Conditions . ........................................................M-15
(2) Lift 1 and 2 Stop Conditions ................. ............................ ...............M-15
(3) LCC Lift-Up Motor EMOT Control ........................ ............... .............M-15
(4) Descent Motion ....................... ........................... ..............................M-16
6-12.Paper Near Empty Detection ...................................................................M-16
6-13.Paper Empty Detection ............................................................................M-17
6-14.Panel Display ...........................................................................................M-17
6-15.Paper Dehumidifying Heaters (Option) ................................................... .M-18
DIS/REASSEMBLY, ADJUSTMENT
1. DISASSEMBLY ...............................................................................................D-1
1-1. Maintenance Schedule ............................................................................D-1
1-2. Removal of Exterior Parts ........................................................................ D-2
1-3. Removal of the Paper Take-Up Unit ........................................................D-3
1-4. Removal of the Paper Take-Up Rolls ......................................................D-4
1-5. Removal of the Feed Roll, Separator Roll and Torque Limiter Assy .......D-6
1-6. Cleaning of the Paper Take-Up Roll ........................................................D-6
1-7. Cleaning of the Feed Roll and Separator Roll .........................................D-6
1-8. Cleaning of the Vertical Transport Roller/Ro lls ................ ........................D-7
1-9. Cleaning of the Roll with a Torque Limiter ............................................ .. .D-7
2. ADJUSTMENT .................................................................................................D-8
2-1. Reference Position Adjustment ............................... ........................... .....D-8
MISFEED/MALFUNCTION DETECTION
1. MISFEED DETECTION .................................... ........................... ....................T- 1
i
FrameMaker Ver.5.5(PC) DB-431 OPTION FOR 7915/7920
01.02.09
1-1. Location of Misfeed Detecting Sensors ...................................................T-1
1-2. Misfeed Detection Timing .......... ............. .... ...... ............. ...... ........... ...... ...T-2
2. MALFUNCTION DETECTION .............................................................. ...........T-2
ii
FrameMaker Ver.5.5(PC) DB-431 OPTION FOR 7915/7920
01.02.09
GENERAL,
MECHANICAL/ELECTRICAL
FrameMaker Ver.5.5(PC) DB-431 OPTION FOR 7915/7920
01.02.09
1. SPECIFICATIONS
Type : Front Loading Type LCC
Type of Paper : Plain paper
Paper Size : B5C, A4C, Letter C
Paper Weight :
Registration : Center
Paper Capacity : 2,500 sheets (1250 × 2)
Power Requirements : DC24 V ± 10 %, DC5.1 V ± 5 % (supplied from copier)
Dimensions : Width ... 535 mm or 21 in
Weight : 17 kg or 37-1/2 lbs.
64 to 90 g/m
Depth ... 568 mm or 22-1/4 in
Height ... 284 mm or 11-1/4 in
2
or 17 to 24 lbs.
2. PARTS IDENTIFICATION
2
1
7
1. Lift 2
2. Vertical Transport Rolls
3. Right Side Door
4. Separator Roll
6
5. Feed Roll
6. Lift 1
7. Front Cover
M-1
4
5
3
4659M001AA
FrameMaker Ver.5.5(PC) DB-431 OPTION FOR 7915/7920
01.02.09
3. CROSS-SECTIONAL VIEW
1
1. Lift 2
2. Paper Take-Up Roll 2
3. Lift 1
4. Paper Take-Up Roll 1
4. DRIVE SYSTEM
Paper Take-Up Drive Mechanism
2345 6
7
8
4659M007AA
5. Vertical Transport Roller
6. Vertical Transport Roll
7. Feed Roll
8. Separator Roll
Vertical Transport Drive Mechanism
Lift Drive Mechanism
4659M002AB
M-2
FrameMaker Ver.5.5(PC) DB-431 OPTION FOR 7915/7920
01.02.09
5. ELECTRICAL COMPONENTS LAYOUT
SIDE
RCL
PWB-A
RS1
BCL
FRONT
P1CL
RSEN
LS1
S1
HMOT
RS2
EMOT
Symbol Name Symbol Name
PWB-A
LCC Control Board
HMOT
LCC Transport Motor
EMOT
LCC Lift-Up Motor
P1CL
Paper Take-Up Clutch 1
P2CL
Paper Take-Up Clutch 2
BCL
Separator Clutch
RCL
Registration Clutch
PPS0
LCC Paper Take-Up Sensor
PPS1
Paper Empty Sensor 1
P2CL
FRONT
LS2
PPS1
EMP
S1
Paper Standby Position Sensor
RSEN
Registration Sensor
EMP
Paper Empty Sensor 2
SIDE
Side Cover Set Sensor
LCC Set Sensor
RS1
Paper Near Empty Sensor 1
RS2
Paper Near Empty Sensor 2
LS1
Lift-Up Sensor 1
LS2
Lift-Up Sensor 2
PPS0
4659M003AA
M-3
FrameMaker Ver.5.5(PC) DB-431 OPTION FOR 7915/7920
01.02.09
6. MECHANISM AND CONTROL
6-1. Vertical Transport Drive Mechanism
• The LCC Transport Motor provides the drive for the Vertical Transport Roller.
Registration Clutch RCL
LCC Transport Motor
HMOT
Vertical Transport Roller
Vertical Transport Roller
4659M004AB
Feed Roll
Separator Roll
Lift 1
4659M506AA
6-2. Paper Take-Up Mechanism
• The LCC Transport Motor is energized and deenergized by the signals output from pins
1 to 6 of CN6A on the LCC Control Board.
M-4
FrameMaker Ver.5.5(PC) DB-431 OPTION FOR 7915/7920
01.02.09
6-3. Paper Take-Up Mechanism
• Paper take-up drive is provided by the LCC Transport Motor.
Separator Clutch BCL
LCC Transport Motor
HMOT
Paper Take-Up Clutch 2
P2CL
Paper Empty Sensor 1
PPS1
Paper Take-Up
Roll 2
Paper Take-Up Clutch 1
P1CL
4659M005AB
LCC Paper Take-Up Sensor
PPS0
Paper Take-Up
Roll 1
Separator Roll
Roll with a Torque Limiter
M-5
Paper Standby Position
Sensor S1
4496M021AB
FrameMaker Ver.5.5(PC) DB-431 OPTION FOR 7915/7920
01.02.09
6-4. Paper Take-Up Operations
(1) Lift 1 Paper Take-Up Operations
Operation 1
• After Lift 1 has completed its ascent motion, Paper Take-Up Roll 1 is driven.
• Paper is transported until its leading edge activates the Paper Standby Position Sensor
(this position serves as the standby position for paper take-up).
Paper Standby Position Sensor S1
Paper Take-Up Roll 1
Lift 2 Lift 1
Operation 2
• A Paper Take-Up signal is sent from the copier.
• The Separator and Feed Rolls, and Paper Take-Up Roll 1 work together to transport the
paper to the Registration Sensor.
• When the Registration Sensor is activated, the paper is further transported over the distance between the Registration Sensor and Vertical Transport Roller, plus a registration
loop length.
• Paper Take-Up Roll 1 is stopped.
Registration Sensor RSEN
Vertical Transport Roller
Paper Take-Up Roll 1
Lift 2 Lift 1
4659M524AA
Separator/Feed
Roll
4659M525AA
M-6
FrameMaker Ver.5.5(PC) DB-431 OPTION FOR 7915/7920
01.02.09
Operation 3
• The Vertical Transport Roller is driven to feed the paper toward the copier.
• When the trailing edge of the paper deactivates the Paper Standby Position Sensor, the
subsequent paper is transported up to the standby position.
• Separator and Feed Rolls are brought to a stop after the lapse of a given period of time
after the Registration Sensor has been deactivated by the tr ailing edge of the paper
being taken up and fed in.
• The next Paper Take-Up signal is issued after the lapse of a given period time after the
Vertical Transport Roller has started turning for the transport of the preceding sheet of
paper.
Registration Sensor RSEN
Vertical Transport Roller
Paper Standby Position Sensor S1
Lift 2 Lift 1
✽
These operations 1 to 3 are repeated to transport paper from Lift 1.
Taking up and feeding two sheets of paper from Lift 1
Start Key ON
Operation
Copier Signal
Registration
Sensor RSEN
Paper Standby
Position S1
Registrator
Clutch RCL
Separator
Clutch BCL
Take-Up
Clutch 1 P1CL
LCC T ransport
Motor HMOT
ON
OFF
H
L
H
L
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Enable Signal
Standby PositionStandby Position
After Lift 1 Has Completed Liffting Motion
Paper Take-Up SignalPaper Take-Up Signal
Separator/Feed
Roll
4659M526AA
Standby Position
4659M521CA
M-7
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