Canon P1, P2 Manual

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 a sound.		Push the part.
	Disconnect the connector.		Connect the power cable.
	Connect the connector.		Disconnect the power cable.
	Remove the cable/wire from the cable guide or wire saddle.		Turn on the power.
	Install the cable/wire to the cable guide or wire saddle.		Turn off the power.
	Remove the screw.		Loosen the screw.
	Install the screw.		Tighten the screw.
	Cleaning is needed.		Measurement is needed.

The following rules apply throughout this Service Manual:

1. Each chapter contains sections explaining the purpose of specific functions and the relationship between electrical andmechanical 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 flipping 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 field. 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.

Product Overview

Specifications

Name of Parts

External View

Cross Section

Technical Explanation

Basic Configuration

Basic Constitution

The Buffer Pass Unit consists of the following major components:

Overview of Electrical Circuitry

The Buffer Pass Unit operation sequence is controlled by the Buffer Pass Controller PCB.
The Buffer Pass Controller PCB receives various commands through the communication cable from its host to drive the motors.

Related Service Mode

• (Lv.1) COPIER > DISPLAY > VERSION > BF-PASS
  For Buffer Pass Unit-P1
• (Lv.1) COPIER > DISPLAY > VERSION > BF-PAS2
  For Buffer Pass Unit-P2

Related Error Code

• E503-0041: Error in communication between the Finisher and Buffer Pass Unit
• E503-0042: Error in communication between the Finisher and Buffer Pass Unit

Controls

Basic Operation

Basic Operation

The device feeds paper that is fed from the Staple Finisher / Booklet Finisher.

Drive Configuration

The following is a diagram showing the drive system of the Buffer Pass Unit.

Jam Detection

Overview

The following diagram shows the arrangement of sensors used to detect jams in the Buffer Pass Unit.

Jam Types

Fan Operation

The 2 fans are equipped in the Buffer Pass Unit which control temperature's rising to prevent image defect when the toner's temperature rises in the host machine.

Power Supply

Power Supply Route

24V and 5V power are supplied to the Buffer Pass Controller PCB through the Finisher Controller PCB.

Protection Function

The power input circuit of Buffer Pass Controller PCB is also provided with a fuse which is blown when an excessive current flows.
The 24V circuits (used to drive the motors) are provided with the fuses or the motor drivers with an overcurrent protective function to provide protection from the over current.

Upgrading

When upgrading the firmware of the Buffer Pass Controller PCB, upgrade from the host machine.
(Refer to the service manual for the host machine as to the detail.)

Periodical Service

Periodically Replaced Parts
There are no parts that need to be periodically replaced on the buffer pass unit.

Consumable Parts
There is no consumable parts on the buffer pass unit.

Parts Replacement and Cleaning

Removing this Machine from the Host Machine

Check that the main power switch is OFF and the power plug is disconnected from the outlet.

List of Parts

Sensors, Motor, PCB

Removing the Buffer Pass Motor

(M401)

1. Turn over the Buffer Pass Unit [1].
2. Loosen the tensioner screw [2] and remove the belt [3].
3. Remove the 2 motor screws [4].
   • 2 Screws [4]
4. Remove the Buffer Pass Feed Motor [1].
   
   • 1 Connector[2]

Removing the Buffer Pass Controller PCB

(PCB401)

1. Remove the Buffer Pass Controller PCB [1].
   
   • 6 Connectors [2]
   • 1 Screw [3]
   • 1 locking support [4]

Basic Adjustment

Buffer pass unit does not have adjustment work.

Service Tools

Special Tools
None

General Circuit Diagram

Safety Precautions

Points to Note Before Servicing

• At servicing, be sure to turn OFF the power source according to the specified steps and disconnect the power plug.
• At the time of assembly and disassembly, be sure to place a sheet of paper under the parts to prevent them from being soiled or foreign matter from entering the parts.
• Before installing the parts to the host machine, ensure that they are free of foreign matter.
• Be careful not to be injured by burrs of edges, sharp corners or protrusions.

Hazardous area such as corners, edges, springs and other sharp sections may be remaining on products. Always be aware of the presence of hazardous area to avoid injury caused by contacting and/or striking those area, by not overconcentrating on service work.

Points to Note at Cleaning

When performing cleaning using organic solvent such as alcohol, be sure to check that the component of solvent is vaporized completely before assembling.

Notes on Assembly/Disassembly

Follow the items below to assemble/disassemble the device.

1. Disconnect the power plug to avoid any potential dangers during assembling/disassembling works.
2. If not specially instructed, reverse the order of disassembly to reinstall.
3. Ensure to use the right screw type (length, diameter, etc.) at the right position when assembling.
4. To keep electric conduction, binding screws with washers are used to attach the grounding wire and the varistor. Ensure to use the right screw type when assembling.
5. Unless it is specially needed, do not operate the device with some parts removed.
6. Never remove the paint-locked screws when disassembling.

DOUBLE POLE/NEUTRAL FUSING
The fuse may be in the neutral, and that the mains shall be disconnected to de-energize the phase conductors.

Points to Note when Tightening a Screw
When a thin plates is used in some parts for the light weighting purpose, warn the following.
In the case of a screw hole with a triangle mark near it as shown in the figure below, strongly tightening the screw may damage or deform the screw hole.
In the case of a screw hole with a triangle mark, take care not to apply too much force when tightening the screw.

The recommended torque value is shown below as a reference value.

* For PCB, refer to the tightening torque value of resin (fastened member).

Type of Screws
RS tight	W Sams	Binding	TP

Documents / Resources

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