Apple Personal LaserWriter 300, Personal LaserWriter 320, LaserWriter 4-600 PS Service manual

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PLW 300 & LW 4/600 PS

Personal LaserWriter 300, Personal LaserWriter 320,

LaserWriter 4/600 PS

K Service Source

Basics

PLW 300 & LW 4/600 PS

Basics

Paper Paths - 1

 

 

 

Paper Paths

There are two paper paths in this family of printers. Paper is fed from the paper cassette or manual-feed slot and delivered to the face-down tray or the face-up delivery slot.

When the paper delivery selector is in the up position, paper is delivered face-down. When the selector is in the down position, paper is delivered face-up. Default delivery is face-down at the top of the printer.

Apple Personal LaserWriter 300, Personal LaserWriter 320, LaserWriter 4-600 PS Service manual

Basics

Paper Paths - 2

 

 

Delivery Roller

 

Toner

 

Cartridge

Paper Delivery Selector

Transfer Roller

 

Fuser

Pickup Roller

Face-Down Path

 

 

 

Toner

 

Cartridge

Fuser

Transfer Roller

Pickup Roller

Face-Up Path

Basics

Sensing System Theory - 3

 

 

 

Sensing System Theory

There are four paper sensors in this family of printers:

PS304, PS303, PS302, and PS301.

PS301

Controller Assembly

PS303

PS304

PS302

Basics

Sensing System Theory - 4

 

 

 

 

Each consists of an actuator and a U-shaped photo

 

interrupter that is soldered to the controller assembly. If

 

the actuator is present inside the U, the circuit closes; if

 

the actuator is absent, the circuit opens. In ready state the

 

appropriate circuit is closed.

 

The paper sensors are actuated as an arm or lever swings

 

against the paper as it moves through the printer.

Sensor Functions

The cassette empty sensor PS304 detects whether there is paper in the cassette tray. If the printer is set for cassette feed and the cassette is empty, sensor PS304 determines that a paper-out condition exists.

Registration paper sensor PS302 detects the presence of paper in the manual-feed slot and detects misfeeds of both

Basics

Sensing System Theory - 5

 

 

 

 

cassette-fed and manual-fed paper. If the paper does not

 

reach the top position of this sensor in the required time,

 

the printer determines that a pick-up delay jam has

 

occurred.

 

Winding paper sensor PS303 detects the passage of paper

 

from the photosensitive drum to the fuser. If the paper does

 

not pass this sensor in time, the controller board

 

determines that a jam condition exists.

 

Paper delivery sensor PS301 detects the passage of paper

 

through the fuser assembly. If the paper does not pass this

 

sensor in time, the controller board determines that a jam

 

condition exists.

 

 

 

 

 

 

 

 

 

 

Basics

Image Formation System - 6

 

 

 

Image Formation System

The nucleus of the printer is the image formation system, which includes the photosensitive drum, the developing unit, and the primary charging roller. These components are contained in the printer's toner cartridge.

Photosensitive Drum

Cartridge

Laser Beam

Cleaning Blade Blade

Primary Charging Roller

Static Charge Eliminator

Developing Cylinder

 

 

Transfer Roller

Basics

Image Formation System - 7

 

 

 

The Printing Process

Upon receiving a print signal from the I/O board, the printer's controller assembly sends power to the main motor. The main motor, in turn, supplies the power that rotates the photosensitive drum, developing cylinder, primary charging roller, and transfer roller.

The primary charging roller applies a uniform negative charge on the photosensitive drum surface. At the same time, the laser/scanner assembly emits a laser beam that scans a latent image onto the surface of the photosensitive drum.

The latent image on the photosensitive drum becomes visible when the transfer roller transfers toner onto the developing cylinder.

Once the image is printed, the cleaner blade removes any

Basics

Image Formation System - 8

 

 

 

 

residual toner on the photosensitive drum surface. Then, as

 

a final step, the primary charging roller lays a uniform

 

charge on the photosensitive drum, readying the drum for

 

the next latent image.

 

 

 

 

 

 

 

 

 

 

Basics Status LEDs - 9

Status LEDs

The printer has three status LEDs: Ready/In Use, PaperOut, and Paper-Jam.

While on standby, the printer's Ready/In Use status LED glows steadily. When a print command is received, the fan comes on and the Ready/In Use LED flashes.

If the cassette tray is empty and the printer is set for cassette feed, the Paper-Out LED glows steadily.

If paper is jammed in the printer, the PaperJam LED glows steadily.

Note: The Personal LaserWriter 320 and LaserWriter 4/ 600 PS also use LEDs to indicate errors during diagnostic mode. Refer to "Engine Diagnostic" in Troubleshooting Tips.

Basics

 

Status LEDs - 10

 

 

The four possible LED conditions for this printer are listed

below:

 

 

 

Warmup or

Ready

Paper-Out Paper-Jam

Processing

 

 

 

Normal

Startup Sequence

Basics

Toner Cartridge - 11

 

 

 

Toner Cartridge

Caution: Avoid placing the toner cartridge near a CRT, disk drive unit, or floppy disk. Do not place the toner cartridge in an upright position or turn it upside down.

Before installing a new toner cartridge, hold the cartridge horizontally as shown and slowly rock it a 45° angle in both directions to evenly distribute the toner.

Print three or four pages after installing a new cartridge to remove any toner that might have leaked during installation.

Drum Exposure

Exposing the toner cartridge to light (even room light for more than 5 minutes) can damage the cartridge and may result in blank spots or black stripes on printed pages. To

Basics

Toner Cartridge - 12

 

 

 

 

avoid such exposure:

 

– Don't leave the rear access door open on the printer

 

when the toner cartridge is installed.

 

– Always cover the toner cartridge when you remove it

 

from the printer.

 

– Avoid storing opened toner packages in areas that are

 

exposed to direct sunlight.

 

Note: If the cartridge has been irradiated by ordinary light,

 

you may be able to repair the damage by placing the

 

cartridge in a dark area, such as a drawer, for several

 

hours. However, do not expose the cartridge to direct

 

sunlight.

 

 

 

 

 

 

 

 

 

 

Basics

LaserWriter Safety - 13

 

 

LaserWriter Safety

Unplug Printer

LaserWriter printers operate at high voltages. To prevent serious injury, always switch off the printer and unplug the AC power cord before servicing the printer.

Laser Beam Safety

Never disconnect the beam-detect cabling or laser shutter when the printer is switched on. Also be careful not to place screwdrivers or other shiny objects in the path of the laser beam. The reflected laser beam, though invisible, can permanently damage your eyes.

Never remove the cover of a laser/scanner assembly, whether the printer is powered on or not.

Basics

LaserWriter Safety - 14

 

 

 

 

Fuser Heat

 

The fuser assembly becomes very hot during printer

 

operation. Before servicing the fuser assembly, switch off

 

the printer for at least 5 minutes to allow the fuser

 

assembly to cool.

 

Toner Safety

 

Toner is a nontoxic substance composed of plastic, iron, and

 

a small amount of pigment. Clean skin and clothing by

 

removing as much toner as possible with a dry tissue and

 

then washing with cold water. Hot water causes toner to jell

 

and permanently fuse into clothing. Toner attacks vinyl

 

materials, so avoid contact with vinyl.

 

 

 

 

 

 

 

 

 

 

K Service Source

Specifications

PLW 300 & LW 4/600 PS

Specifications

General - 1

 

 

 

Engine

Printing Method

Optical System

Resolution

Imaging Language

Supported

General

Canon P90 engine

Electrophotography using single-component, dry-jumping development

Semiconductor laser; scanning mirror

300 dots per inch (dpi) (PLW 300 and 320)

600 dpi (LW 4/600 PS)

Quickdraw (PLW 300)

PostScript Level 2 (PLW 320 and LW 4/600 PS)

 

Specifications

General - 2

 

 

 

 

System

Macintosh computer with system 6.0.7 or later

Requirements

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Specifications

Intro Date - 3

 

 

 

Intro Date

Personal

LaserWriter 300

Personal

LaserWriter 320

LaserWriter 4/600

PS

June 1993

January 1994

June 1995

 

Specifications

Logic Board - 4

 

 

 

 

 

 

Logic Board

CPU

PLW 300: N/A

 

 

PLW 320: AMD 29205 processor

 

 

LW 4/600 PS: AMD 29200 RISC processor

RAM

PLW 300: 512 K

 

 

PLW 320: 2 MB (expandable to 8 MB)

 

 

LW 4/600 PS: 2 MB (expandable to 6 MB)

ROM

PLW 300: N/A

 

 

PLW 320: 2.5 MB

 

 

LW 4/600 PS: 2.5 MB

 

 

 

 

 

 

 

 

 

 

 

 

 

Specifications

Logic Board - 5

 

 

 

 

I/O

PLW 300: Serial, externally clocked

 

 

PLW 320: LocalTalk

 

 

LW 4/600PS: LocalTalk (EtherTalk and TokenTalk connectivity

 

 

through LaserWriter Bridge 2.0 software.)

Specifications

Performance - 6

 

 

 

Printing Speed

Duty Cycle

Minimum Life

Expectancy

Printable Area

Performance

Approximately 4 pages/min. (A4). Actual performance depends on the images printed and the computer used.

No limit in pages per month

150,000 pages

Maximum printable lines: 8 in. (203 mm)

Minimum top and bottom margins: 0.25 in. (6.35 mm) Minimum left and right margins: 0.25 in. (6.35 mm)

The Personal LaserWriter 320 requires a total of 4 MB of RAM in order to print edge to edge on legal paper.

Specifications

Paper - 7

 

 

 

Paper

Paper Weights

Cassette feed:17-20 lb., single-sheet, photocopy bond

Manual feed:17-28 lb., letterhead and colored stock, standardweight

transparency material, envelopes, and labels

Cassette Type

Paper Delivery

Capacity In

Capacity Out

Universal (letter, legal, A4, executive)

Face-down/face-up

Cassette: 100 sheets

Manual: Single sheets, envelopes, transparency material, etc.

25 plain sheets (face-down delivery only)

Specifications

Paper - 8

 

 

 

 

Transparency material, labels, and postcard paper are delivered

 

face-up only and must be removed by hand.

 

 

 

 

 

 

 

 

 

 

Specifications

Fonts - 9

 

 

 

Fonts

Serif Fonts

Sans Serif Fonts

Special-Purpose

Fonts

ITC Bookman, Courier, New Century Schoolbook, Palatino, Times, Chicago, and New York

ITC Avant Garde, Helvetica, Helvetica Narrow, Geneva, and Monaco

Symbol, ITC Zapf Chancery, and ITC Zapf Dingbats

Specifications

Electrical - 10

 

 

 

Line Voltage

Power Consumption

Electrical

US/Japan: 100-120 V; 50-60 Hz

Europe/Austrailia: 220-240 V; 50 Hz

Operating: 450 W maximum at 115 V or 220 V Standby: 10 W or less

 

Specifications

Physical - 11

 

 

 

 

 

 

Physical

Dimensions

Width: 15.2 in. (38.5 cm)

 

 

Depth: 14.9 in. (37.9 cm)

 

 

Height: 6.3 in. (16.1 cm)

Weight

15.4 lb. (7 kg) without cartridge

 

 

 

 

 

 

 

 

 

 

 

 

Specifications

Environmental - 12

 

 

 

Temperature

Humidity

Ozone Emission

Environmental

Operating: 50-90.5° F (10-32.5° C)

Storage: 32-95° F (0-35° C)

Operating: 20-80% relative humidity, noncondensing Storage: 10-80% relative humidity, noncondensing

Less than 0.05 parts per million maximum, measured in accordance with ECMA 129 or UL114 standards for ozone

K Service Source

Troubleshooting

PLW 300 & LW 4/600 PS

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