Oki MB770 User manual

MB770 / MB770+
MPS5502 / MPS5502+
MC770 / MB770+
MC780 / MC780+
MPS3537 / MPS3537+
MPS4242 / MPS4242+
Finisher Maintenance Manual
MJ-1038
Rev 2

45372301TH Rev.2 iii /
Oki Data CONFIDENTIAL
TRADEMARKS
• Molykote is a registered trademark of Dow Corning Corporation.
• Other company names and product names in this manual are the trademarks of their respective
companies.
© 2013 OKI DATA CORPORATION All rights reserved
Under the copyright laws, this manual cannot be reproduced in any form without prior written
permission of OKI DATA CORPORATION.

45372301TH Rev.2 vi /
Oki Data CONFIDENTIAL
CONTENTS
MJ-1038
1. SPECIFICATIONS, ACCESSORY AND CONSUMABLES.......................................... 1-1
1.1 Specifications....................................................................................................................... 1-1
1.2 Accessory ............................................................................................................................ 1-3
1.3 Consumables....................................................................................................................... 1-4
2. GENERAL DESCRIPTION............................................................................................ 2-1
2.1 Main Components................................................................................................................ 2-1
2.2 Sectional View ..................................................................................................................... 2-2
2.3 Electric Parts Layout............................................................................................................ 2-4
2.4 Symbols and Functions of Various Components................................................................. 2-6
2.5 Diagram of Signal Blocks..................................................................................................... 2-8
3. DESCRIPTION OF OPERATIONS ............................................................................... 3-1
3.1 Basic Operations ................................................................................................................. 3-1
3.1.1 Specifications ......................................................................................................... 3-1
3.1.2 Transport drive system - General description ........................................................ 3-2
3.1.3 Jam detection ......................................................................................................... 3-9
4. DISASSEMBLY AND INSTALLATION......................................................................... 4-1
4.1 Disassembly and Replacement of Covers........................................................................... 4-1
4.1.1 Upper cover............................................................................................................ 4-1
4.1.2 Right cover ............................................................................................................. 4-1
4.1.3 Left cover................................................................................................................ 4-2
4.2 Disassembly and Replacement of Sensors and Switches................................................... 4-3
4.2.1 Guide upper ASSY ................................................................................................. 4-3
4.2.2 Guide rear ASSY.................................................................................................... 4-3
4.2.3 Entrance transport sensor (S1) .............................................................................. 4-6
4.2.4 Exit transport sensor (S2)....................................................................................... 4-6
4.2.5 Alignment plate home position sensor (R) (S4)...................................................... 4-7
4.2.6 Alignment plate home position sensor (L) (S5) ...................................................... 4-7
4.2.7 Ejector home position sensor (S7) ......................................................................... 4-8
4.2.8 Ejector encoder sensor (S8)................................................................................. 4-10
4.2.9 Stapler paper sensor (S14) .................................................................................. 4-13
4.2.10 Stack home position sensor (S9) ......................................................................... 4-15
4.2.11 Paper support home position sensor (S6) ............................................................ 4-17
4.2.12 Door switch (SW2) ............................................................................................... 4-20
4.2.13 Stacker tray lower limit switch (SW1) ................................................................... 4-20
4.2.14 Lever path home position sensor (S15) ............................................................... 4-21
4.3 Disassembly and Replacement of motors ......................................................................... 4-22
4.3.1 Entrance transport motor (M1) ............................................................................. 4-22
4.3.2 Exit transport motor (M2)...................................................................................... 4-22
4.3.3 Alignment motor (R) (M4)..................................................................................... 4-23
4.3.4 Alignment motor (L) (M5) ..................................................................................... 4-25
4.3.5 Paddle motor (M3)................................................................................................ 4-27
4.3.6 Paper support motor (M6) .................................................................................... 4-28
4.3.7 Ejector motor (M7)................................................................................................ 4-31
4.3.8 Stacker motor (M8)............................................................................................... 4-34
4.3.9 Lever path motor (M10)........................................................................................ 4-35
4.4 Disassembly and Replacement of transport system.......................................................... 4-37
4.4.1 Entrance transport roller....................................................................................... 4-37
4.4.2 Exit Transport roller .............................................................................................. 4-38
4.4.3 Exit roller (PM)...................................................................................................... 4-39
4.4.4 Sub paddle ........................................................................................................... 4-41

45372301TH Rev.2 vii /
Oki Data CONFIDENTIAL
4.4.5 Main paddle (PM) ................................................................................................. 4-42
4.4.6 SCU paddle .......................................................................................................... 4-43
4.5 Disassembly and Replacement of Others ......................................................................... 4-45
4.5.1 Finisher control PC board ASSY .......................................................................... 4-45
4.5.2 Finisher control PC board..................................................................................... 4-45
4.5.3 Stapler .................................................................................................................. 4-46
5. ADJUSTMENT .............................................................................................................. 5-1
5.1 Stapling Position Misalignment............................................................................................ 5-1
6. TROUBLESHOOTING .................................................................................................. 6-1
6.1 Troubleshooting................................................................................................................... 6-1
6.2 Alarm ................................................................................................................................. 6-14
6.3 Other.................................................................................................................................. 6-14
7. PREVENTIVE MAINTENANCE (PM) / FIRMWARE UPDATE ..................................... 7-1
7.1 PM Parts.............................................................................................................................. 7-1
7.2 Consumables and Duration ................................................................................................. 7-1
7.2.1 Finisher section ...................................................................................................... 7-1
7.3 Maintenance by Customers ................................................................................................. 7-1
7.4 Maintenance and Inspection Points..................................................................................... 7-1
7.5 Grease................................................................................................................................. 7-2
7.6 Firmware Update ................................................................................................................. 7-2
8. ELECTRIC CIRCUIT ..................................................................................................... 8-1
8.1 Harness Diagram................................................................................................................. 8-1
8.2 Circuit Diagram .................................................................................................................... 8-4
8.3 PC Boards ........................................................................................................................... 8-9
8.4 Electric Signals .................................................................................................................. 8-10
8.4.1 Finisher section .................................................................................................... 8-10

45372301TH Rev.2 1-1 /
Oki Data CONFIDENTIAL
1. SPECIFICATIONS, ACCESSORY AND CONSUMABLES
1.1 Specifications
• Product Type Inner Finisher (1 trays)
• Paper Stacking Device Stationary Tray
• Paper Size A4, A5, B5, Executive, Folio, LG13", LG13.5", LG14", LT, Statement, 16K
(195 × 270)
• Paper Basis Weight 64 - 220 g/m2(17 lb. Bond to 58 lb. Bond)
• Stacking Mode Simple, Offset, Staple and composite
• Dimensions W386.7 × D579* × H212 (mm)
* with stacker tray.
• Gross Weight 8.3 kg (18.29 lb)
• Power Supply DC24V10% and DC5V5% supplied from the main equipment.
• Power Consumption DC24V 40W or less
5V 2.6W or less
• Stacking Type Facedown
• Stacking Height with
- Considered full when STACK TRAY reaches lower limit in excess of specifications noted here.
- Exceeding maximum number of continuous batches of staples is not covered by the warranty.
- The Tray movement is a 71 mm motion vertically from the Home position.
Fig. 1-1
Operation Mode Sheets loaded Remarks
Non-Sort, Offset Minimum 500 sheets, or 71 mm STACK TRAY movement When using 80 g/m2
Staple STACK TRAY movement 71 mm, up to 20 continuous batches When using 80 g/m2
71mm

45372301TH Rev.2 1-2 /
Oki Data CONFIDENTIAL
• Stapling Position
Fig. 1-2
• Paper Size for stapling
Stapling is not available for paper in sizes other than the above.
• Paper Basis Weight for stapling 64 - 220 g/m2
• Number of sheets that can be stapled
• Staple Loading exclusive cartridge
• Manual Stapling Function is not included
[1] Transport direction
Stapling Position Paper Size
Single A4, B5, Executive, Folio, LG13", LG13.5", LG14", LT, 16K (184 × 260, 195 ×
270, 197 × 273)
Paper Size 64 - 82 g/m2
Paper
83 - 105 g/m2
Paper 105 - 220 g/m2
Folio, LG13", LG13.5", LG14" 30 15 2 (Cover paper)
A4, B5, Executive, LT, 16K (184 × 260,
195 × 270, 197 × 273)
50 30 2 (Cover paper)
(45°)
5 ±2 mm5 ±2 mm
[1]

45372301TH Rev.2 1-3 /
Oki Data CONFIDENTIAL
1.2 Accessory
Fig. 1-3
Symbol Name Quan-
tity Symbol Name Quan- tity
A Stacker tray 1pc a Screw: M4x6 2pc
B BKT MOUNT LEFT 1pc b Screw: M3x6 6pc
C BKT MOUNT RIGHT 1pc c Screw: M3x10 2pc
D Paper Guide 1pc d Screw: M3x8 1pc
E Film 2 sheets e Screw: M3x12 3pc
F Film 1 sheet
G Control Panel Fixing Plate 1pc
H Stopper (A) 1pc
I Stopper (B) 1pc
J Damper 1pc
Unpacking Instruction 1set
M4x6 M3x6
6pcs
M3x10 M3x8 M3x12
3pcs
A
E
CD
F G H I
J
abc ed
B

45372301TH Rev.2 1-4 /
Oki Data CONFIDENTIAL
1.3 Consumables
• Staple cartridge exclusive cartridge (STAPLE-2000)

45372301TH Rev.2 2-1 /
Oki Data CONFIDENTIAL
2. GENERAL DESCRIPTION
2.1 Main Components
Fig. 2-1
1 Upper cover 5 Stapler
2 Right cover 6 Rear cover
3 Left cover 7 Connector cover
4 Stacker tray
[5]
[4]
[7]
[1]
[2] [3]
[6]

45372301TH Rev.2 2-2 /
Oki Data CONFIDENTIAL
2.2 Sectional View
[A] Right side
Fig. 2-2
1 Stapler motor 9 Paper support home position sensor
2 Stapler 10 Stapler paper sensor
3 Stacker tray 11 Right alignment motor
4 Lever path motor 12 Stack home position sensor
5 Lever path home position sensor 13 Paper support motor
6 Paddle home position sensor 14 Ejector encoder sensor
7 Right alignment plate home position sensor 15 Ejector motor
8 Stacker motor
[3]
[4]
[6][7]
[5]
[8]
[11] [10]
[9]
[15][14][13][12]
[1][2]

45372301TH Rev.2 2-3 /
Oki Data CONFIDENTIAL
[B] Left side
Fig. 2-3
1 Entrance transport sensor 6 Exit transport motor
2 Exit transport sensor 7 Stacker tray lower limit switch
3 Door switch 8 Alignment plate home position sensor (L)
4 Ejector home position sensor 9 Paddle motor
5 Alignment motor (L) 10 Entrance transport motor
[3] [2]
[4]
[1]
[7]
[5]
[6]
[9] [8][10]

45372301TH Rev.2 2-4 /
Oki Data CONFIDENTIAL
2.3 Electric Parts Layout
[A] Sensors and switches
Fig. 2-4
S1
S6
SW1
S2
S7
S5SW2S14S9S3
S4
FIN
S8
S15

45372301TH Rev.2 2-5 /
Oki Data CONFIDENTIAL
[B] Motors and PC boards
Fig. 2-5
M2
M1
M5
M3M9M4
M6
M8
M10
M7

45372301TH Rev.2 2-6 /
Oki Data CONFIDENTIAL
2.4 Symbols and Functions of Various Components
The column <P-I> shows the page and item number in the parts list.
1. Motors
2. Sensors and switches
Symbol Name Function P-I Remarks
M1 Entrance transport motor Drives the entrance transport roller
M2 Exit transport motor Drives the exit transport roller
M3 Paddle motor Drives the paddle
M4 Alignment motor (R) Drives the right alignment plate
M5 Alignment motor (L) Drives the left alignment plate
M6 Paper support motor Drives the paper support
M7 Ejector motor Drives the ejector
M8 Stacker motor Drives the stacker tray
M9 Stapler motor Drives the Stapler
M10 Lever path motor Drives the lever path
Symbol Name Function P-I Remarks
S1 Entrance transport sensor Detects the paper of the entrance
transport roller.
S2 Exit transport sensor Detects the paper of the exit transport
roller.
S3 Paddle home position sensor Detects the home position of the pad-
dle.
S4 Alignment plate home posi-
tion sensor (R)
Detects the home position of the right
alignment plate.
S5 Alignment plate home posi-
tion sensor (L)
Detects the home position of the left
alignment plate.
S6 Paper support home position
sensor
Detects the home position of the paper
support.
S7 Ejector home position sensor Detects the home position of the ejec-
tor.
S8 Ejector encoder sensor Detects the position of the ejector.
S9 Stack home position sensor Detects the home position of the
stacker tray.
S14 Stapler paper sensor Detects whether there is paper to sta-
ple.
S15 Lever path home position
sensor
Detects the home position of the lever
path.
SW1 Stacker tray lower limit switch Detects the lower limit of the stacker
tray.
SW2 Door switch Detects the opening/closing of the rear
cover.

45372301TH Rev.2 2-7 /
Oki Data CONFIDENTIAL
3. PC board
Symbol Name Function P-I Remarks
FIN Finisher control PC board Controls the Finisher.

45372301TH Rev.2 2-8 /
Oki Data CONFIDENTIAL
2.5 Diagram of Signal Blocks
The operational sequence of the finisher is controlled by the Finisher control PC board (FIN).
The CPU on the PC board controls paper transportation and serial transmissions of the machine.
A block diagram of the finisher is shown below.
Fig. 2-6
MFP Interface
FEED IN PATH SNR
S1
STAPLE PAPER DETECT SNR
S14
FIN PWBA
CN1
DC24V OUT
DC5V OUT
DC24V IN
DC5V IN
DXRa t aDd n e S
POLYSW( R72)
COM NO
DOOR I/L SW
S15
STEP MOTOR DRIVER IC
STEP
MTR M1
FEED IN MTR
STEP MOTOR DRIVER IC
STEP MOTOR DRIVER IC
STEP MOTOR DRIVER IC
STEP MOTOR DRIVER IC
STEP MOTOR DRIVER IC
DC MOTOR DRIVER IC
DC MOTOR DRIVER IC
DC MOTOR DRIVER
STEP
MTR M2
FEED OUT MTR
POLYSW(R56)
POLYSW(R57)
POLYSW(R71)
POLYSW(R66)
POLYSW(R82)
POLYSW(R67)
POLYSW(R76)
POLYSW(R77)
POLYSW(R145)
STEP
MTR M4
F JOG MTR
STEP
MTR M5
R JOG MTR
STEP
MTR M6
EXT. TRAY MTR
STEP
MTR M3
PADDLE MTR
DC
MTR M7
EJECT MTR
DC
MTR M9
STP MTR
DC
MTR M8
STK MTR
COM NC
STK DN SW
S10
DC24V FOR STK UP
DC24V FOR STK DOWN
CPU
FEED EXIT SNR
S2
F JOG HOME SNR
S4
R JOG HOME SNR
S5
PADDLE HOME SNR
S3
EJECT HOME SNR
S7
EJECT ENCODER SNR
S8
STK TOP SNR
S9
EXIT TRAY HOME SNR
S6
STAPLER
STAPLE LOW
S13
STAPLER READY
S12
STAPLER HOME
S11
DOOR OPEN DETECT
STK LOW DETECT
DC5V
DC24V
5V SENSOR
STEP MOTOR DRIVER IC
STEP
MTR
LEVER PATH MTR
M10
LEVER PATH HOME SNR
S15
Receive Data TXD
Connect Chk1 GD
POLYSW(R81)

45372301TH Rev.2 3-1 /
Oki Data CONFIDENTIAL
3. DESCRIPTION OF OPERATIONS
3.1 Basic Operations
3.1.1 Specifications
The Finisher exits paper transported from the equipment. Paper exit modes available are; the simple
stack (straight-through paper exit) mode, offset mode and staple stack mode.
The operations noted above are controlled by the Finisher control PC board (FIN) in accordance with
commands from the equipment.

45372301TH Rev.2 3-2 /
Oki Data CONFIDENTIAL
3.1.2 Transport drive system - General description
The Finisher selects an appropriate exiting mode among the simple stack (straight-through paper exit)
mode, offset mode and staple stack mode in accordance with commands from the equipment, and then
exits the finished paper onto a tray.
Fig. 3-1
[A] MFP Interface Section
[B] Entrance transport section
[C] Exit transport section
[D] Finishing tray section
[E] Stacker tray section
[B]
[A]
[C]
[D]
[E]

45372301TH Rev.2 3-3 /
Oki Data CONFIDENTIAL
[A] MFP Interface Section
Fig. 3-2
If the finisher is specified as the paper discharge destination, the lever path motor (M10) rotates forward
and drives the lever so the machine's flapper (transport pass gate) switches to the finisher side, and the
paper is transported into the finisher.
When transportation of the paper into the finisher is complete, the lever path motor (M10) rotates back-
ward driving the lever so the lever returns to the home position, and the machine's flapper (transport
pass gate) switches to the machine's tray side.
[1] Flapper (Finisher side)
[2] Flapper (MFP side)
[3] Lever path motor (M10)
[1]
[3]
[2]
[3]

45372301TH Rev.2 3-4 /
Oki Data CONFIDENTIAL
[B] Entrance transport section
Fig. 3-3
Paper transported from the machine is conveyed by the paper transport belt, which is driven by the
entrance transport motor (M1), and the entrance transport roller and transport roller rotate to transport it
to the discharge section.
The entrance transport sensor (S1) detects the paper being transported.
[1] Entrance transport roller
[2] Transport roller
[3] Entrance transport sensor
[2]
[3]
[1]