Apple Personal LaserWriter SC, Personal LaserWriter NT, Personal LaserWriter NTR, Personal LaserWriter LS, Personal LaserWriter LS-L Service manual

K Service Source

PLW SC/NT/NTR/LS

Personal LaserWriter SC, Personal LaserWriter NT,

Personal LaserWriter NTR, Personal LaserWriter LS,

Personal LaserWriter LS/L

K Service Source

Basics

PLW SC/NT/NTR/LS

Basics Product Information - 1

Product Information

The printers covered in this manual are

• Personal LaserWriter SC

• Personal LaserWriter NT

• Personal LaserWriter NTR

• Personal LaserWriter LS

• Personal LaserWriter LS/L

Compatibility

Not all parts are compatible among the five models. Refer to Illustrated Parts for compatibility cross references.

The cassette feeder tray and its associated parts are optional on the LS, LS/L, and NTR models.

Basics	Paper Paths - 2

Paper Paths

There are four paper paths in the Personal LaserWriter. Paper is fed from the cassette or multipurpose tray and delivered to the face-down or face-up delivery trays.

Note: Face signifies image side. Default delivery is facedown at the top of the printer.

Basics	LS–LS/L Identification - 3

I/O Board Bracket

Power Switch

Personal LaserWriter LS

Solid Rear Cover

LS–LS/L Identification

The LS/L is a cost-reduced version of the LS but is sold and packaged under the same LS name. Parts are not necessarily interchangeable between the two models.

External distinguishing characteristics:

• LS: The power switch is on the left rear of printer; the rear cover has an opening for an I/O board bracket and displays the family number M2000.

• LS/L: The power switch is on the right rear of printer; the rear cover is solid plastic and displays the family number M2002.

Power Switch

Personal LaserWriter LS/L

Basics	Sensing System Theory - 4

PS12 PS11

PS502

PS501

PS13 PS901

Sensing System Theory

There are six sensors in the Personal LaserWriter: four paper sensors and two printer-open sensors. Each consists of an actuator, a U- shaped photo interrupter, and circuitry that communicates with the controller.

If the actuator is present inside the U, the circuit closes; if it is absent, the circuit opens. In ready state the appropriate circuit is closed.

Basics	Sensing System Theory - 5

PS12 PS11

PS502

PS501

PS13 PS901

Paper sensors are actuated as an arm or lever swings against movement of paper. Printer-open sensors are actuated as the user shuts a door or cover.

Illustrations on the following cards show each sensor as it would appear in print ready state. Some peripheral elements are deleted for clarity.

PLW SC/NT/NTR/LS	Basics - 6

Actuator Tab on

Toner Cartridge

Photo Interrupter

PS11

Toner Cartridge Sensor

Actuator: Toner cartridge shutter flips into position as front door closes.

PLW SC/NT/NTR/LS	Basics - 7

Photo

Interrupter

PS12

Delivery Unit Paper Sensor

Actuator: Sensing lever housed in fuser Paper-Sensing Lever assembly is tripped by paper exiting fuser.

PLW SC/NT/NTR/LS	Basics - 8

Photo

Interrupter

Paper-Sensing Lever

PS13

Pickup Unit Paper Sensor

Actuator: Sensing lever in feeder assembly is tripped by paper entering feed cycle.

PLW SC/NT/NTR/LS	Basics - 9

PS501

Multipurpose Tray Sensor

Actuator: Sensing lever in multipurpose cable assembly is tripped by manually fed paper.

Photo

Interrupter

Paper-Sensing Lever (Shown in tripped position)

PLW SC/NT/NTR/LS	Basics - 10

PS502

Face-Up Cover Sensor

Actuator: Sensing arm is tripped by the closing of the face-up ocver.

Cover

Sensing

Arm

Photo Interrupter

PLW SC/NT/NTR/LS	Basics - 11

Photo

Interrupter

Paper-

Sensing Arm

PS901

Paper Cassette Sensor

Actuator: Sensing arm is tripped by the insertion of loaded cassette tray.

Basics	Startup Test Pages - 12

Startup Test Pages

The Personal LaserWriter SC, NT, and NTR generate a startup test page 2 – 3 minutes after you switch on the printer. The LS and LS/ L do not produce such a page.

In the NT and NTR the startup test page also shows unit-specific configuration information. The following pages describe each element of the startup test pages.

PLW SC/NT/NTR/LS	Basics - 13

Printer Name

I/O Board

Type

NT/NTR Startup Test Page

Communication Protocol

RS-232 serial or AppleTalk

Fonts in ROM

Installed RAM

Version of ROM installed

Number of pages the I/O board has produced

Basics	Startup Test Pages - 14
	The Personal LaserWriter
	SC test page consists of a line
	matrix. The printer
	generates a test page only if
	you set its SCSI address to 7
	prior to switching on the
	printer. It continues to
	print until it is out of paper.
	Note: Be sure to set the SCSI
	address back before
	resuming printing.

SC Startup Test Page

Basics	Service Test Page - 15

Service Test Page

Successful printing of a service test page confirms print engine operation.

There are three variations in how you run a service test page, depending on the model you are servicing. Each involves using a pencil or similar dowel-shaped tool to depress the service test button on the DC controller board (or serial controller on the LS/L).

Service Test Page

Basics	Service Test Page - 16

SC, NT, NTR

First remove the I/O board. You can then access the test button through the 1/4- inch diameter opening in the I/O shield.

SC, NT, NTR

Service Test Page

Basics	Service Test Page - 17

LS

First remove the I/O board bracket. You can then access the test button through the 1/4-inch diameter opening in the end plate.

LS

Service Test Page

Basics	Service Test Page - 18

LS/L

First remove the test button cover on the rear panel of the printer. You can then access the test button through the opening in the rear panel.

LS/L

Service Test Page

K Service Source

Specifications

PLW SC/NT/NTR/LS

Specifications	General - 1

Engine

Printing Method

Optical System

Resolution

Imaging Languages

Supported

General

Canon P110 engine

Electrophotography using single-component dry toner Semiconductor laser and a rotating dual-faced scanning mirror 300 dpi

SC: QuickDraw

NT: PostScript, HP LaserJet Plus, and a subset of Diablo 630 NTR: PostScript, HP LaserJet Plus, and a subset of Diablo 630 LS: QuickDraw

LS/L: QuickDraw

Specifications	Intro Dates - 2

Intro Dates

SC and NT

LS

LS/L and NTR

July 1990

March 1991

March 1992

Specifications Logic Board - 3

	Logic Board
CPU	SC: Motorola 68000 microprocessor (7.275 MHz)
	NT: Motorola 68000 microprocessor (12 MHz)
	NTR: N/A
	LS: N/A
	LS/L: N/A
DRAM	SC: 1 MB
	NT: 2 MB, expandable to 8 MB
	NTR: 3 MB, expandable to 4 MB
	LS: 512K, expandable to 1 MB
	LS/L: 512K, expandable to 1 MB

	Specifications		Logic Board - 4
ROM		SC:	32K
		NT:	1.25 MB
		NTR: 3 MB
		LS: N/A
		LS/L: N/A
I/O		SC: SCSI
		NT: LocalTalk, RS-232, RS-422
		NTR: LocalTalk, RS-232, RS-422, Centronics parallel
		LS: RS-422
		LS/L: RS-422

Specifications	Performance - 5

Printing Speed

Print Delivery

Life Expectancy

Performance

4 pages per minute maximum; actual performance depends on the application

Face-down or face-up (manually selectable)

150,000 pages with no monthly page limit

Specifications	Paper - 6

Paper Weights

Cassette Sizes

Capacity In

Paper

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

Manual feed: 20-28 lb., letterhead and colored stock, mediumweight transparency material, envelopes, and labels

US letter standard; legal, A4, B5, and envelope cassettes optional

Cassette: 250 sheets

Manual: 50/70 sheet capacities

Envelope cassette: 15 envelopes, minimum size 86 x 178 mm (3.5 x 7 in.), maximum size 188 x 267 mm (7.4 x 10 in.)

Capacity Out

Face-down tray: 50 sheets Face-up tray: 20 sheets

Specifications	Built-In Fonts - 7

Built-In Fonts

SC, LS, and LS/L

NT

N/A

Times, Helvetica, Helvetica Narrow, Courier, Symbol, Palatino, ITC Avant Garde, Gothic, ITC Bookman, New Century Schoolbook, ITC Zapf Chancery, and ITC Zapf Dingbats

NTR	Times, Helvetica, Helvetica Narrow, Courier, Symbol, Palatino,
	ITC Avant Garde, Gothic, ITC Bookman, New Century
	Schoolbook, ITC Zapf Chancery, ITC Zapf Dingbats, and IBM PC
	Graphics Extended Character Set (ECS)

Specifications	Environmental - 8

Environmental

Temperature

Humidity

Noise Level

50-90.5° F (10-32.5° C)

20-80% relative humidity

Printing: Under 53 dB(A)

Standby: Under 43 dB(A)

Specifications	Electrical - 9

Line Voltage

Power Consumption

Electrical

US/Japan: 100/115 V, 50/60 Hz

Europe/Australia: 220/240 V, 50 Hz

600 W maximum (100/115 V)

550 W maximum (220/240 V)