Canon K1 User manual

4321
Buffer Pass Unit-K1
Service Manual

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Application
This manual has been issued by Canon Inc. for qualied persons to learn technical theory,
installation, maintenance, and repair of products. This manual covers all localities where the
products are sold. For this reason, there may be information in this manual that does not
apply to your locality.
Corrections
This manual may contain technical inaccuracies or typographical errors due to improvements
or changes in products. When changes occur in applicable products or in the contents of this
manual, Canon will release technical information as the need arises. In the event of major
changes in the contents of this manual over a long or short period, Canon will issue a new
edition of this manual.
The following paragraph does not apply to any countries where such provisions are
inconsistent with local law.
Trademarks
The product names and company names used in this manual are the registered trademarks
of the individual companies.
Copyright
This manual is copyrighted with all rights reserved. Under the copyright laws, this manual may
not be copied, reproduced or translated into another language, in whole or in part, without the
written consent of Canon Inc.
(C) CANON INC. 2012
Caution
Use of this manual should be strictly supervised to avoid disclosure of condential
information.

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Explanation of Symbols
The following symbols are used throughout this Service Manual.
Symbols Explanation Symbols Explanation
Check. Remove the claw.
Check visually. Insert the claw.
Check the noise. Use the bundled part.
Disconnect the connector. Push the part.
Connect the connector. Plug the power cable.
Remove the cable/wire
from the cable guide or wire
saddle.
Turn on the power.
Set the cable/wire to the
cable guide or wire saddle.
Remove the screw.
Tighten the screw.
The following rules apply throughout this Service Manual:
1. Each chapter contains sections explaining the purpose of specic functions and the
relationship between electrical and mechanical systems with reference to the timing of
operation.
In the diagrams, represents the path of mechanical drive; where a signal name
accompanies the symbol, the arrow indicates the direction of the electric
signal.
The expression "turn on the power" means ipping on the power switch, closing the
front door, and closing the delivery unit door, which results in supplying the machine with
power.
2. In the digital circuits, '1' is used to indicate that the voltage level of a given signal is
"High", while '0' is used to indicate "Low". (The voltage value, however, differs from
circuit to circuit.) In addition, the asterisk (*) as in "DRMD*" indicates that the DRMD
signal goes on when '0'.
In practically all cases, the internal mechanisms of a microprocessor cannot be checked
in the eld. Therefore, the operations of the microprocessors used in the machines
are not discussed: they are explained in terms of from sensors to the input of the DC
controller PCB and from the output of the DC controller PCB to the loads.
The descriptions in this Service Manual are subject to change without notice for product
improvement or other purposes, and major changes will be communicated in the form of
Service Information bulletins.
All service persons are expected to have a good understanding of the contents of this Service
Manual and all relevant Service Information bulletins and be able to identify and isolate faults
in the machine.

Contents
Safety Precautions
Notes Before it Works Serving---------------------------------------------0-8
Produt Outline
Specications ------------------------------------------------------------------1-2
Names of Parts ----------------------------------------------------------------1-2
External View ----------------------------------------------------------------------- 1-2
Cross Section ----------------------------------------------------------------------- 1-2
Technology
Basic Conguration-----------------------------------------------------------2-2
Functional Conguration --------------------------------------------------------- 2-2
Drive Conguration ---------------------------------------------------------------- 2-2
Controls--------------------------------------------------------------------------2-3
Decurler/Compression amount control --------------------------------------- 2-3
Overview -------------------------------------------------------------------------------------- 2-3
Latch mechanism ------------------------------------------------------------------ 2-4
Overview -------------------------------------------------------------------------------------- 2-4
Jam detection ----------------------------------------------------------------------- 2-4
Overview -------------------------------------------------------------------------------------- 2-4
Servicing Work --------------------------------------------------------------------- 2-4
Periodically replaced / consumable parts -------------------------------------------- 2-4
Parts Replacement and Cleaning Procedure
List of Parts ---------------------------------------------------------------------3-2
Motor/Sensor/PCB----------------------------------------------------------------- 3-2
Removing the Buffer Pass --------------------------------------------------3-2
Removing the Buffer Pass Unit------------------------------------------------- 3-2
Removing the Upper Cover ----------------------------------------------------- 3-5
Removing the Lower Cover ----------------------------------------------------- 3-5
Removing the Buffer Driver PCB ---------------------------------------------- 3-7
Removing the Buffer Cooling Fan --------------------------------------------- 3-7
Removing the Buffer Feeding Motor ------------------------------------------ 3-8
Removing the Decurler Motor -------------------------------------------------- 3-9
Removing the Decurler Roller -------------------------------------------------3-10
Installation
How to Check this Installation Procedure-------------------------------4-2
When using the parts included in the package----------------------------- 4-2
Symbols in the illustration-------------------------------------------------------- 4-2
Product Name------------------------------------------------------------------4-2
Making Pre-installation Checks--------------------------------------------4-2
Cecking the Contents --------------------------------------------------------4-3
Installation Outline Drawing ------------------------------------------------4-3
UnpackingUnpacking --------------------------------------------------------4-3
Check Item when Turning OFF the Main Power ----------------------4-3
Installation Procedure--------------------------------------------------------4-4
Appendix
Service Tools ----------------------------------------------------------------- 4-11
Solvents and Oils ----------------------------------------------------------------- 4-11
Special Tools ----------------------------------------------------------------------- 4-11
General Circuit Diagram--------------------------------------------------- 4-12
General Circuit Diagram --------------------------------------------------------4-12

Safety Precautions
■Notes Before it Works Serving

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Safety Precautions > Notes Before it Works Serving
Safety Precautions > Notes Before it Works Serving
Notes Before it Works Serving
Caution:
At servicing, be sure to turn off the power source according to the specied steps and
disconnect the power plug.
Caution:
Do not turn off the power switch when downloading is under way.
Turning off the main power switch while downloading is under way can disable the
machine.

1
1
Produt Outline
Produt Outline
■Specications
■Names of Parts

1
1
1-2
1-2
Produt Outline > Names of Parts > Cross Section
Produt Outline > Names of Parts > Cross Section
Specications
Item Description Remarks
Placement Center
Feed Speed 139.05(1/1speed), 69.5 (1/2speed)mm/
sec
Transfer from the host machine
Installation Build-in type
Power Supply Supplied by the host machine
Option Unavailable
Names of Parts
External View
[1]
[2]
[3]
[1] Upper Cover
[2] Lower Cover
[3] Left Lower Cover
T-1-1
F-1-1
T-1-2
Cross Section
[1][2][1][1] [3][4][5]
[1] Buffer feed roller
[2] Decurler roller
[3] Buffer Inlet Sensor
[4] Decurler HP Sensor
[5] Buffer Outlet Sensor
F-1-2
T-1-3

2
2
Technology
Technology
■Decurler/Compression
amount control
■Latch mechanism
■Jam detection
■Servicing Work

2
2
2-2
2-2
Technology > Basic Conguration > Drive Conguration
Technology > Basic Conguration > Drive Conguration
Basic Conguration
Functional Conguration
The buffer unit consists of the following major components:
[2]
[3]
[8]
[5]
[1]
[6]
[4]
[7]
No. Mark Name
[1] FM1 Buffer Pass Cooling Fan
[2] M1 Buffer Pass Decurler Motor
[3] M2 Buffer Pass Feedi Motor
[4] SR1 Buffer Pass Inlet Sensor
[5] SR2 Buffer Pass Outlet Sensor
[6] SR4 Buffer Pass Decurl HP Sensor
[7] SW1 Buffer Pass Interlock Switch
[8] UN1 Buffer Pass Driver PCB
F-2-1
T-2-1
Drive Conguration
The following is a diagram showing the drive system of the buffer path:
M2
M1 [1][2][3][4]
Mark Name
M1 Buffer Pass Decurler Motor
M2 Buffer Pass Feed Motor
[1][3][4] Buffer Pass Feed Roller
[2] Buffer Pass Decurler Roller
F-2-2
T-2-2

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2
2-3
2-3
Technology > Controls > Decurler/Compression amount control > Overview
Technology > Controls > Decurler/Compression amount control > Overview
Controls
Decurler/Compression amount control
■Overview
Upward curl of paper received by the Staple Finisher-M1/Saddle Stitch Finisher-M1 is
corrected by applying pressure (controlling the compression amount) to a fed sheet of paper
using the Decurler Roller and the Hard Roller.
Adjustment member
Decurler Adjustment Cam
Decurler roller
NOTE: Related service mode
COPIER > OPTION > FEED-SW > DCL-FACE
Selection of decurler control:1-/2-sided
COPIER > OPTION > FEED-SW > DCL-ADJ
Adjustment of decurl correction level
F-2-3
Driving the Decurler Motor rotates the Decurler Adjustment Cam (operates the compression
amount adjustment member), which changes the amount of pressure (compression amount)
applied by the Decurler Roller and the Hard Roller.
compression amount
adjustment member
Decurler
Adjustment Cam
F-2-4

2
2
2-4
2-4
Technology > Controls > Servicing Work > Periodically replaced / consumable parts
Technology > Controls > Servicing Work > Periodically replaced / consumable parts
Latch mechanism
■Overview
There is a latch mechanism in the Buffer Lower Cover, and releasing the latch opens the
cover in a downward direction. When the Decurler HP Sensor is in the home position (= when
the Decurler Roller is disengaged), the cover opens.
Home
Position Pressing
SR4
SR4
●Engagement/Disengagement timing
Status of decurler
Engaged At pickup in a job in which paper is delivered to a nisher (at re-pickup in case
of duplex printing)
Disengaged At occurrence of a jam
At warm-up rotation after power-ON
At completion of printing
At introduction of a print job in which paper is delivered to the First Delivery
F-2-5
T-2-3
Jam detection
■Overview
Sensors that detect jam in the Buffer Path are shown below.
[PS2]
[PS1]
PS1 Buffer Inlet Sensor
PS2 Buffer Outlet Sensor
●Types of jam
Sensors that detect jam and their detection timing are shown below.
Types of jam Sensor Jam code Detection timing
Delay jam PS1 0111 When the sensor does not turn ON within a specied
period of time
PS2 0112
Stationary jam PS1 0211 When the sensor does not turn OFF within a specied
period of time after sensor turns ON
PS2 0212
Power-on jam PS1 0A11 When paper remains after each sensor checks for any
remaining paper at power-on/opening the door
PS2 0A12
Servicing Work
■Periodically replaced / consumable parts
There is no periodically replaced / consumable parts.
F-2-6
T-2-4
T-2-5

3
3
Parts Replacement and Cleaning Procedure
Parts Replacement and
Cleaning Procedure
■List of Parts
■Removing the Buffer Pass Unit
■Removing the Upper Cover
■Removing the Lower Cover
■Removing the Buffer Driver PCB
■Removing the Buffer Cooling Fan
■Removing the Buffer Feeding Motor
■Removing the Decurler Motor
■Removing the Decurler Roller

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3
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3-2
Parts Replacement and Cleaning Procedure > Removing the Buffer Pass > Removing the Buffer Pass Unit
Parts Replacement and Cleaning Procedure > Removing the Buffer Pass > Removing the Buffer Pass Unit
List of Parts
Motor/Sensor/PCB
[2]
[3]
[8]
[5]
[1]
[6]
[4]
[7]
No. Symbol Name Reference
[1] FM1 Buffer Cooling Fan 3-7
[2] M1 Decurler Motor 3-9
[3] M2 Buffer Feed Motor 3-8
[4] SR1 Buffer Inlet Sensor
[5] SR2 Buffer Outlet Sensor
[6] SR4 Decurler HP Sensor
[7] SW1 Buffer Interlock Switch
[8] UN1 Buffer Driver PCB 3-7
F-3-1
T-3-1
Removing the Buffer Pass
Removing the Buffer Pass Unit
Procedure
1) Open the Front Cover, Right Lower Cover, and Right Door.
F-3-2

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3
3-3
3-3
Parts Replacement and Cleaning Procedure > Removing the Buffer Pass > Removing the Buffer Pass Unit
Parts Replacement and Cleaning Procedure > Removing the Buffer Pass > Removing the Buffer Pass Unit
2)Remove the Upper Front Cover.
• 2 Screws (TP) [1]
• 2 Protrusions [2]
[1]
[2]
[1]
3)Remove the Right Upper Cover.
• 1 Claw [1]
• 2 Protrusions [2]
[1]
[2]
F-3-3
F-3-4
4) Disconnect the 2 connectors [1], and free the harness from the guide.
x2
[1]
5) Remove the Side Cover (Left).
• 2 Screws (TP) [1]
• 3 Hooks [2]
[2]
[1]
[2]
[2]
x2
F-3-5
F-3-6

3
3
3-4
3-4
Parts Replacement and Cleaning Procedure > Removing the Buffer Pass > Removing the Buffer Pass Unit
Parts Replacement and Cleaning Procedure > Removing the Buffer Pass > Removing the Buffer Pass Unit
6) Open the guide of the Buffer Pass Unit, and remove the 2 screws (binding) [1].
• 1 Screw (TP) [2]
[1] [1]
[2]
7)Remove the Inner Cover (Right Rear).
• 1 Screw (RS) [1]
• 3 Protrusions [2]
[1]
[2]
F-3-7
F-3-8
8)Disconnect the connector [1] and remove the Reuse Band [2].
[1][2]
9)Remove the Buffer Pass Unit.
F-3-9
F-3-10

3
3
3-5
3-5
Parts Replacement and Cleaning Procedure > Removing the Buffer Pass > Removing the Lower Cover
Parts Replacement and Cleaning Procedure > Removing the Buffer Pass > Removing the Lower Cover
Removing the Upper Cover
Preparation
1)Remove the Buffer Pass Unit from the host machine.
Procedure
1)Remove the Upper Cover.
• 2 Screws (Binding) [1]
• 4 Claws [2]
• 1 Boss [3]
x4
x2
[3]
[2]
[1]
[2]
[1]
F-3-11
Removing the Lower Cover
Preparation
1)Remove the Buffer Pass Unit from the host machine.
2)Remove the Upper Cover.
Procedure
1) Disconnect the connector [1], and free the harness from the Wire Saddle [2].
[2]
[1]
2)Free the harness from the Wire Saddle [1] and the guide.
[1]
F-3-12
F-3-13

3
3
3-6
3-6
Parts Replacement and Cleaning Procedure > Removing the Buffer Pass > Removing the Lower Cover
Parts Replacement and Cleaning Procedure > Removing the Buffer Pass > Removing the Lower Cover
3) Turn over the Buffer Pass Unit, and remove the stopper [1].
• 1 Screw (Binding) [2]
[1] [2]
4) Remove the Lower Cover Unit.
F-3-14
F-3-15
5) Remove the Lower Cover.
• 3 Screws (Binding) [1]
• 7 Claws [2]
[2]
[2]
[2]
[1]
[2]
[1]
x7
x3
F-3-16

3
3
3-7
3-7
Parts Replacement and Cleaning Procedure > Removing the Buffer Pass > Removing the Buffer Cooling Fan
Parts Replacement and Cleaning Procedure > Removing the Buffer Pass > Removing the Buffer Cooling Fan
Removing the Buffer Driver PCB
Preparation
1)Remove the Buffer Pass Unit from the host machine.
Procedure
1) Disconnect the 8 connectors [1], and free the harness from the Wire Saddle [2].
x8
[1] [2]
2)Remove the Buffer Driver PCB.
• 3 Screws (TP) [1]
x3
[1]
[1] [1]
F-3-17
F-3-18
Removing the Buffer Cooling Fan
Preparation
1)Remove the Buffer Pass Unit from the host machine.
2)Remove the Upper Cover.
3) Remove the Lower Cover.
Procedure
1)Remove the Duct Unit.
• 2 Screws (Binding) [1]
• 2 Bosses [2]
x2
[1]
[2]
[2]
[1]
2)Remove the Decurler Fan.
• 1 Connector [1]
• 2 Claws [2]
x2
[2]
[1]
F-3-19
F-3-20

3
3
3-8
3-8
Parts Replacement and Cleaning Procedure > Removing the Buffer Pass > Removing the Buffer Feeding Motor
Parts Replacement and Cleaning Procedure > Removing the Buffer Pass > Removing the Buffer Feeding Motor
Removing the Buffer Feeding Motor
Preparation
1)Remove the Buffer Pass Unit from the host machine.
Procedure
1) Disconnect the 8 connectors [1], and free the harness from the Wire Saddle [2].
x8
[1] [2]
2) Remove the Grounding Spring [1], and remove the Decurler Motor 1 Unit [2].
• 5 Screws (Binding) [3]
x5
[1]
[3]
[3]
[3]
[2]
F-3-21
F-3-22
3)Remove the gear.
4) Remove the Drive Belt Retainer [1], Drive Belt [2], and Pressure Spring [3].
• 1 Screw (Binding) [4]
[3]
[1]
[2] [4]
F-3-23
F-3-24