Apple Laserwriter Pro 600, Laserwriter Pro 630 Service Manual

Service Source

LaserWriter Pro 600/630

LaserWriter Pro 600, LaserWriter Pro 630

Service Source

Basics

LaserWriter Pro 600/630

Basics Product Information - 1

Product Information

The printers covered in this manual are the LaserWriter Pro 600 and LaserWriter Pro 630. Except for the I/O boards, all parts are identical between the two models.

Basics Product Information - 2

Note:

Refer to the following chapters in the Envelope Feeder LW Pro-LW 16/6 and Sheet Feeder LW Pro-LW 16/6 manuals for additional information on feeder options.

– Take-Apart – Additional Procedures – Adjustments – Illustrated Parts

Basics LaserWriter Utility - 3

LaserWriter Utility

Note:

Refer to the user's guide for complete information regarding LaserWriter Utility. This application gives you software control over the LaserWriter Pro that is essential to its operation. Some of features of LaserWriter Utility include:

– Naming the printer – Setting default printer resolution – Turning on FinePrint – Turning on PhotoGrade (if available) – Setting default paper-handling options – Setting print density – Setting communication protocols – Printing configuration page – Turning off the startup test page

Note:

You must use LaserWriter Utility version 7.4 or

Basics LaserWriter Utility - 4

later. You can override some default settings through the Print dialog (LaserWriter driver version 7.2 or later).

Basics Paper Path - 5

Paper Path

There are four paper

Optional

Standard Cassette (250)

Optional Sheet Feeder (500)

Envelope Feeder (75)

Multipurpose Tray (100)

sources and one output tray in a complete system. The number in parenthesis is the capacity of the paper source.

Note:

The asterisk at the point where the paper paths meet denotes a synchronization pause. See PS602 in “Sensing System Theory” in this chapter.

Basics Mechanical Drive Theory - 6

Mechanical Drive

Theory

There are four motors and four separate drive trains in a complete system. Two are in the printer engine and one is in each of the optional feeders.

• M1 Main Motor

• M2 Pickup Block Motor

• M3 Sheet Feeder Motor

• M4 Envelope Feeder

Motor

Basics Mechanical Drive Theory - 7

M1 Main Motor Drive

Power

Supply

Toner Cartridge

Transfer Roller

DC Controller Board

Connecting Cable

Main Motor

Drive Assembly

Fuser Assembly

Gears/Rollers

Delivery Roller Assy

Gears/Belt/Rollers

The main motor powers the system that transports paper from the toner cartridge to the delivery tray on top of the printer.

Note:

The letters next to the boxes correspond to the

labels in the mechanical drive animations that are available on the CD.

Basics Mechanical Drive Theory - 8

M2 Pickup Block Motor Drive

Power

Supply

DC Controller Board

Connecting Cable

Pickup Controller Board

The pickup block motor powers the system that transports paper into the engine, through the pickup

block, and up to the toner cartridge.

Pickup

Solenoids

Pickup Sensor Board

Pickup Block Motor

Gear/Roller System

Note:

The DC controller board does not connect

directly to the pickup block motor. Make sure to troubleshoot the three intermediate blocks if there is a failure in pickup block drive. Ê

Basics Mechanical Drive Theory - 9

M3 Sheet Feeder Motor Drive

Power

Supply

ENGINE

SHEET FEEDER

DC Controller Board

Connecting Cable

Pickup Controller Board

Connecting Cable

Controller Block

Feeder Controller Board

Sheet Feeder Motor

The sheet feeder motor powers the system that transports paper from the

500-sheet cassette upward into the printer engine.

Note:

Once the paper

reaches the lower feed roller in the pickup block,

engine components supply mechanical drive.

Pickup

Solenoid

Gear/Roller System

Basics Mechanical Drive Theory - 10

Power

Supply

ENGINE

ENV FEEDER

Pickup

Rollers

DC Controller Board

Connecting Cable

Pickup Controller Board

Connecting Cable

Feeder Controller Board

Envelope Feeder Motor

Drive Assembly

Primary Feed Roller

Separation Drive Assy

M4 Envelope Feeder Motor Drive

The envelope feeder motor

powers the system that separates envelopes and feeds them into the printer engine.

Note:

Once an envelope reaches the upper feed rollers in the pickup block, engine components supply mechanical drive.

Basics Sensing System Theory - 11

Sensing System Theory

There are six paper sensors, one dual-purpose sensor, and seven sensing switches in a LaserWriter Pro 600/630 PS system:

Paper Sensors

– PS601: Cassette Paper Sensor – PS602: Registration Paper Sensor – PS701: Multipurpose Paper-End Sensor – PS702: Multipurpose Paper-Present Sensor – PS851: Sheet Feeder Paper-Present Sensor – PS931: Envelope Paper-Present Sensor – PS201: Delivery/Interlock Sensor

Sensing Switches

– SW601: Top Cover Interlock Switch – SW603: Upper Cassette Size Sensing Switch

Basics Sensing System Theory - 12

– •SW604: Upper Cassette Size Sensing Switch – •SW605: Upper Cassette Size Sensing Switch – •SW851: Lower Cassette Size Sensing Switch – •SW852: Lower Cassette Size Sensing Switch – •SW853: Lower Cassette Size Sensing Switch

Basics Sensing System Theory - 13

Actuator

OPEN

CLOSED

Photointerrupter

Paper Sensors

Paper sensors consist of an actuator, a U-shaped photo interrupter, and circuitry. Sensors are tripped as the actuator swings against movement of paper and blocks the gap of the U. An actuator can be passive (governed by gravity) or spring-loaded.

Note:

Sensor failure can be either mechanical or electrical. When troubleshooting sensors, first confirm that the arm

Basics Sensing System Theory - 14

or lever moves freely without snagging, that any springs are applying correct resistance, and that the actuator is not broken. Then check that all cable connections are secure. If you have eliminated mechanical issues, proceed with electrical troubleshooting.

Basics Sensing System Theory - 15

PS601

Cassette Paper Sensor

Actuator: A passive lever in the sensor holder assembly is tripped by insertion of a loaded cassette tray.

Sensor

Holder

Assembly

PS601

Paper

Pickup Block

Basics Sensing System Theory - 16

PS602

Registration Paper Sensor

Actuator: A spring-loaded lever in the sensor holder assembly is tripped by arriving paper.

Sensor

Holder

Assembly

PS602

Paper

Pickup Block

All paper stops at PS602 and waits for proper synchronization with drum rotation and mechanical drive.

Note:

If paper does not reach sensor PS602 within the prescribed time after the pickup signal is issued, a

Basics Sensing System Theory - 17

pickup unit delay jam exists and the controller stops printing.

If paper reaches the sensor but does not clear it within the correct time, a pickup unit stationary jam exists. The time allowed for paper to clear is a function of paper size, which is detected by PS701 (for manually fed paper) and by sensing switches (for cassette-fed paper).

Basics Sensing System Theory - 18

PS702

Multipurpose PaperPresent Sensor

Actuator: A spring-loaded lever in the paper pickup block is tripped by the

Pickup

Sensor

Board

PS702

Paper

Pickup Block

leading edge of paper as it is loaded in the multipurpose tray.

Basics Sensing System Theory - 19

PS701

Multipurpose Paper-End Sensor

Actuator: A passive lever in the paper pickup block is tripped by the trailing edge

Pickup

Sensor

Board

PS701

Paper

Pickup Block

of paper leaving the multipurpose tray.

Sensor PS701 detects the size of paper fed from the multipurpose tray.

Basics Sensing System Theory - 20

PS201

Delivery/Interlock Sensor

Actuator: A plastic tab on the fuser door and a sensing lever in the fuser assembly

Delivery/Interlock Sensor

act independently to trip a photo interrupter.

PS201 detects two things: paper exiting the fuser and closure of the fuser door.

Note:

If paper does not reach sensor PS201 within

5.2 seconds after it reached registration sensor J602, a delivery unit delay jam

Basics Sensing System Theory - 21

exists and the controller stops printing.

If paper reaches the sensor but does not clear it within the correct time, a delivery unit stationary jam exists. The time allowed for paper to clear is a function of paper size, which is detected by PS701 (for manually fed paper) and by sensing switches (for cassette-fed paper).

Basics Sensing System Theory - 22

PS851

Sheet Feeder PaperPresent Sensor

Actuator: A passive lever in the controller block is tripped by insertion of a loaded cassette tray.

PS851

Controller

Block

Basics Sensing System Theory - 23

PS931

Envelope Feeder PaperPresent Sensor

Actuator: A spring-loaded lever is tripped by placement of envelopes into the feeder.

Basics Sensing System Theory - 24

Circuit Board

Leaf Spring

Microswitch

Actuator

Microswitch ON

Microswitch OFF

Sensing Switches

Sensing switches attach to a circuit board and do not use photo interrupters.

Switches are actuated by leaf springs that press inward as you insert a cassette tray or close the top cover.

Failure in sensing switches can be either mechanical or electrical. When troubleshooting switches, first confirm that the actuator has not broken off and then confirm that the leaf springs are not bent or

Basics Sensing System Theory - 25

misshapen. You should be able to press the leaf spring with your finger and hear the clicking of the microswitch.

If you have eliminated mechanical issues, proceed with electrical troubleshooting.

Basics Sensing System Theory - 26

SW601

Top Cover Interlock Switch

Actuator: A tab on the top cover actuates a leaf spring

Cover Interlock Arm

Cover Interlock Spring

Cover Interlock Actuator

SW601

Pickup

Controller

Board

Paper

Pickup Block

and pin, which press the microswitch on the pickup controller board. See “Troubleshooting Tips” in Troubleshooting for information on defeating the top cover interlock switch.

Basics Sensing System Theory - 27

Cassette (None) Legal Letter A4 Executive B5

SW603 SW604 SW605

OFF OFF OFF

ON ON

ON ON OFF OFF OFF OFF

OFF OFF

ON ON ON

OFF

Paper

Pickup Block

Pickup

Controller

Board

SW603 SW604 SW605

SW603/4/5

Cassette Size Sensing Switches (Upper)

Actuator: Plastic tabs on the side of the cassette trays actuate leaf springs, which press microswitches on the pickup controller board. The tab/switch configurations are as shown.

Note:

See the next page for a note regarding the 250sheet universal cassette.

Basics Sensing System Theory - 28

SW851/2/3

Cassette Size Sensing Switches (Lower)

Actuator: Plastic tabs on the side of a cassette tray actuate leaf springs, which

Sheet Feeder

Controller Board

SW851 SW852 SW853

press microswitches on the sheet feeder controller board.

Note:

The sheet feeder uses a 500-sheet universal cassette. As with the upper 250-sheet universal cassette, the tabs are set manually by adjusting a selection dial on the cassette.

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