Apple Personal LaserWriter SC, Personal LaserWriter NT, Personal LaserWriter NTR, Personal LaserWriter LS, Personal LaserWriter LS-L Service manual
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Service Source
PLW SC/NT/NTR/LS
Personal LaserWriter SC, Personal LaserWriter NT,
Personal LaserWriter NTR, Personal LaserWriter LS,
Personal LaserWriter LS/L
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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 face-
down at the top of the printer.
Basics LS–LS/L Identification - 3
LS–LS/L Identification
I/O Board Bracket
Power Switch
Personal LaserWriter LS
Solid Rear Cover
Power Switch
Personal LaserWriter LS/L
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.
Basics Sensing System Theory - 4
Sensing System Theory
PS502
PS13
PS12
PS501
PS11
PS901
There are six sensors in the
Personal LaserWriter: four
paper sensors and two
printer-open sensors. Each
consists of an actuator, a Ushaped 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
Paper sensors are actuated
as an arm or lever swings
against movement of paper.
Printer-open sensors are
PS11
PS12
actuated as the user shuts a
door or cover.
Illustrations on the
following cards show each
sensor as it would appear in
PS501
PS502
PS13
PS901
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
assembly is tripped by paper exiting fuser.
Paper-Sensing Lever
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
Photo
Interrupter
PS501
Multipurpose Tray Sensor
Actuator: Sensing lever in multipurpose cable
assembly is tripped by manually fed paper.
Paper-Sensing Lever
(Shown in tripped position)
PLW SC/NT/NTR/LS Basics - 10
Cover
Sensing
Arm
PS502
Face-Up Cover Sensor
Actuator: Sensing arm is tripped
by the closing of the face-up ocver.
Photo Interrupter
PLW SC/NT/NTR/LS Basics - 11
Photo
Interrupter
PaperSensing 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
Ê
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 1/4inch 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
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Service Source
Specifications
PLW SC/NT/NTR/LS
Specifications General - 1
General
Engine
Printing Method
Optical System
Resolution
Imaging Languages Supported
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
DRAM
SC: Motorola 68000 microprocessor (7.275 MHz)
NT: Motorola 68000 microprocessor (12 MHz)
NTR: N/A
LS: N/A
LS/L: N/A
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
I/O
SC: 32K
NT: 1.25 MB
NTR: 3 MB
LS: N/A
LS/L: N/A
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
Performance
Printing Speed
Print Delivery
Life Expectancy
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
Paper W eights
Cassette Sizes
Capacity In
Capacity Out
Cassette feed: 20 lb., single-sheet, photocopy bond
Manual feed: 20-28 lb., letterhead and colored stock, medium-
weight 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.)
Face-down tray: 50 sheets
Face-up tray: 20 sheets
Specifications Built-In Fonts - 7
Built-In Fonts
SC, LS, and LS/L
NT
NTR
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
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
Electrical
Line V oltage
Power Consumption
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)
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