Apple Plw Sc.Nt.Ntr.Ls 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 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

K

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)

Specifications Physical - 10

Physical

Dimensions

Weight

Height: 8 in. (20.3 cm), 9.8 in. (24.8 cm) with cassette feeder
Width: 15 in. (38 cm)

SC, NT, and NTR: 32 lb. (15 kg)
LS and LS/L: 31 lb. (14.5 kg)

K

Service Source

Troubleshooting

PLW SC/NT/NTR/LS

Troubleshooting Status Panel LEDs - 1

Status Panel LEDs

On the next page is an illustration that shows the possible LED
patterns that can occur with the Personal LaserWriter.

Note:

Refer to "Print Engine Check" in Flowcharts for full

troubleshooting paths.

Troubleshooting Status Panel LEDs - 2

Front Access Door Open

No Toner Cartridge

or Face-Up Cover Open

System Theory” in Basics.)

LS and LS/L display only

these configurations

(see “LS Error Messages”)

(see PS11/PS502 in “Sensing

Ready Paper

Out

Paper

Jam

I/O Board

Alternating

FLASH

Fuser or

Laser/Scanner

Simultaneous

FLASH

Troubleshooting Capacitor Discharge - 3

Capacitor Discharge

When there is a failure of the fusing system, the DC controller
board shuts off current to the fuser roller heater and charges
capacitor C212 to prevent overheating (C209 on the LS/L serial
controller board).

DC Controller Board

(SC, NT, NTR, LS)

C212

C209

Serial Controller

(LS/L)

Troubleshooting Capacitor Discharge - 4

Before you can use the printer again, you must switch the power
off and wait 3 minutes for the capacitor to discharge. If you do not
want to wait, you can manually discharge the capacitor as
described below.

Remove the top cover, locate the capacitor described on the
previous page, and carefully jumper the two wires at the base of
the capacitor as shown on the next page.

Note:

Remove the I/O board and/or shield if you are servicing an
SC, NT, or NTR. Remove the PCB shield if you are servicing an LS/
L.

Caution:

components around the capacitor. There are many different tools
that can be used to discharge the capacitor: a flat blade
screwdriver, paper clip, or aluminum foil doubled over. The tool
illustrated is a length of lead solder. It has the advantage of being
ductile and is less apt to damage the controller board.

Take care not to damage the board tracings or the

Troubleshooting Capacitor Discharge - 5

Capacitor C212
(C209 on LS/L)

Troubleshooting LS Error Messages - 6

LS Error Messages

The SC, NT, and NTR display errors through status panel readouts
(see “Status LEDs”). The LS and LS/L display errors through
alert dialogs on the host computer.

For other hardware-related messages, go to “Print Engine
Check.” For non-hardware error messages, follow the prompt
given, or call the Apple Technical Assistance Center.

Note:

If you are having communication problems with an LS,
make sure that you have used the installer to load the printer
driver.

Troubleshooting Roller Diameters - 7

Roller Diameters

Repetitive printing defects can often be isolated by measuring the
tracking left by rollers. On the next page is a diagram that shows
all the rollers in the Personal LaserWriter that come into contact
with paper. The dimension given is the distance between tracks.

Troubleshooting Roller Diameters - 8

Toner Cartridge Rollers

1.5" (38 mm): primary charging roller

2.0" (51 mm): developer roller

3.7" (94 mm): photosensitive drum

Fuser Assembly

2.15" (54 mm): lower fuser roller

2.9" (74 mm): upper fuser roller

Other Rollers

1.9" (49 mm): paper feed roller

2.05" (52 mm): transfer roller

Troubleshooting Drum Check - 9

Drum Check

Interrupting a print cycle and inspecting the photosensitive drum
can help isolate the cause of print quality problems. If the image
on the surface of the drum exhibits the same problem as the
printed page, the fault is before the drum, probably somewhere in
the scanning system.

If the image on the drum is okay, the fault is after the drum,
probably in the fuser assembly, transfer roller, or high-voltage
power supply.

Note:

Refer to “Roller Diameters” in this chapter for further
quick-check troubleshooting tips.

Troubleshooting Flowcharts - 10

Flowcharts

The flowcharts for this manual are contained in an interactive file
called “PLW SC/NT/NTR/LS Flowcharts.” This file has been
derived from the original version of Service Source but is a
standalone self-launching application. To launch this file, click
the button below..

220/240V
Models

CB101

BK BKCB101

TB101 TB102

L

IL101
N

RT101

TB102

C101

C102

Power Supply

C101

C102

L101

Door
Switch

Unit

L101

R101

J11

VZ101

ACH
ACLFU1

FSRDRV

Power
Switch

SW11

256

3

TB103

YB105

TB106

TB104

C104 Q101

TB107

J102

1
2

J152

TB109-2

2
1

TB109-1

+5V

TB108

Door
Switch

L102

2

J101

SQ101C103

Fuser

PCB

Assembly

TB501

TB502

1

1A 3A

1B 3B

SW101

R102

R103

SSR101

426

1

R104

Front Access Door

Fuser Assembly

TP1

J501
1

RT501

TP2

3

Roller
Clutch
Solenoid

RT502

TH1

SL501Pick-Up

Fixing
DC PCB

H1

1
1

TB503

RT505 RT102

D502

RT503 RT504

3

2

J5802

3

2

TB504

D501

J503

132

PS501

C

GND

Multi-Purpose
Tray
Paper
Sensor

A

J504

Cartridge Sensor

Delivery Paper Sensor

PS11

PS12

CGA

CGA

J13

123

123

12312

TB702 J12

TB703

R701

3

R702

PS502

C

-1-3-2

Exhaust Fan

123

J701

Driver

VR701

GND

Fan

A

Delivery
Unit
Door
Open
Sensor

FM11

EP-L Cartridge

Primary Charging
Roller

Drum

Developing
Cylinder

Transfer
Charging
Roller

RT103

RT104

FT101

1

4

P. Primary

TB601

SG

T. Transfer

J602

HVT

+24V

GND

HVACVR+8V

123456789

J601

RT105

J602

2

D. Development

HVDC

HVT1

HVD

HVT2

10

HVT3

Cassette Paper Feeder

GND

SW903

A

R902

R901

SW902

SW901

Cassette
Feed
Roller
Clutch
Solenoid

SL902

5

4

Q902 Q901

Cassette
Paper
Sensor

PS901

C

132

132

J902 J905

R904

Cassette Size
Sensing
Switches

R903

123456789

Cassette
Pick-Up
Roller
Clutch
Solenoid

SL901

7

6

Cassette
Paper
Feeder
PCB

Main Motor

+5V

+5V

BRBRBL

GND

GND

BL

J212

4
3
2
1

GND

+24V

GND

+24V

GND

+12V

GND

BLBLRRBLORBLBRY

123456789

GND

GND

GND

GND

+24V

+24V

+12V

SG

PPRDY

TOP

A1A2A3A4A5A6A7A8A9

J301

J302

GND
GND
+5V
+5V

LED Power

LED 1

LED 2

123
123

4
4

LED 3

J303

Display Panel

+5V

FSRDRV

+5V

FSRDRV

STS

CBSY

N.C.

VDOI

CCLK

/CCLK

/PRFD

/VDO

J304

A1A2A3A4A5A6A7A8A9

PS13

Pick-up Unit
Paper Sensor

C

GND

A

123

J208 J14

123

GND

PFA

PFSNS

PRFD

RESET

BOO

RDY

SBSY

PCLK

B1B2B3B4B5B6B7B8B9

A10

Interconnect PCB

Reserved

/CBSY

/STS

/TOP

/PPRDY

LED Power

PRNT

LED 1

A10

CPRDY

CMD

Reserved

A11

GND

A12

N.C.

N.C.

TSTPNT

B10

GND

GND

GND

GND

A13

A14

A15

A16

I/O Board

123456789

J209

POA

GND

PFDRV

/CMD

FSRTH

/CPRDY

POUT

/PRNT

GND

/PCLK

DOSNSE

/SBSY

/RDY

+24V

Reserved

Reserved

B1B2B3B4B5B6B7B8B9

123456789

TB701J213

10

123456789

+8V

DOA

GND

+12V

DC Controller

/BD

LED 2

LED 3

+5V

B11

B12

B10

+5V

B13

+5V

+5V

B14

POSNS

DOSNSE

+5V

B15

FMDRV

+5V

B16

CNTD

VR

GND

Density
Adj.
PCB

1234567

1234567

J401 J202

J204

+5V

GND

Laser
Driver

123456789

J206

Optical Fiber

GND

+24V

APCIN

LSRPWR

VDOUT

GND

+8V

M1

SCNCLK

SCNTAC

J205 J901

SCNON

+12V

1

1

123456789

+5V

+5V

+24V

OPSIZ2

OPMD

OPSIZ1

OPSIZ0

OPPOUT

+5V

+12V

123456789

J207

10

VR

+8V

HVD

HVTI

HVT2

HVDC

HVT3

GND

65432

65432

J301 J203

HVAC

+24V

OPCD

GND

GND

RDYNH

12345

J210

COA

LPC

TSS

TSC

+8V

6

OAOBOA

OB

COB

APCIN

TSTPE

TSTPNT

10

11

12

Scanner

Motor Unit

Personal LaserWriter SC/NT

Wiring Diagram

220/240V
Models

CB101

BK BKCB101

TB101 TB102

L

IL101
N

RT101

TB102

C101

C101

L101

C102

Power Supply

Unit

L101

C102

Door
Switch

R101

Power
Switch

J11

VZ101

ACH
ACLFU1

FSRDRV

SW11

256

3

TB103

YB105

TB106

TB104

C104 Q101

TB107

J102

1
2

J152

TB109-2

2
1

TB109-1

+5V

TB108

Door
Switch

L102

J101

SQ101C103

Fuser

PCB

Assembly

TB501

TB502

2

1A 3A

1B 3B

SW101

R102

SSR101

426

R104

1

R103

1

Pick-Up
Roller
Clutch
Solenoid

Front Access Door

Fuser Assembly

TP1

J501
1

RT501

TP2

3

RT502

SL501

TH1

Fixing
DC PCB

H1

1
1

TB503

RT505 RT102

D502

RT503 RT504

3

2

3

2

TB504

J5802

D501

J503

132

PS501

C

GND

Multi­Purpose
Tray
Paper
Sensor

A

J504

Cartridge Sensor

Delivery Paper Sensor

PS11

PS12

CGA

CGA

J13

123

123
12312

TB702 J12

TB703

R701

3

R702

PS502

C

GND

A

-1-3-2

Exhaust Fan

123

J701

Fan

Driver

VR701

Delivery
Unit
Door
Open
Sensor

FM11

EP-L Cartridge

Primary Charging
Roller

Drum

Developing
Cylinder

Transfer
Charging
Roller

RT103

RT104

FT101

1

4

J602

TB601

SG

P. Primary

T. Transfer

HVT

+24V

GND

HVACVR+8V

123456789

J601

RT105

J602

2

D. Development

HVDC

HVT1

HVD

HVT2

10

HVT3

Cassette Paper Feeder

GND

SW903

A

R902

R901

SW902

SW901

Cassette
Feed
Roller
Clutch
Solenoid

SL902

5

4

Q902 Q901

Cassette
Paper
Sensor

PS901

C

132

132

J902 J905

R904

Cassette Size
Sensing
Switches

R903

123456789

Cassette
Pick-Up
Roller
Clutch
Solenoid

SL901

7

6

Cassette
Paper
Feeder
PCB

Main Motor

Display

Panel

J208 J14

PS13

C

123

123

PFSNS

GND

GND

Pick-up Unit
Paper Sensor

A

PFA

123456789

J209

GND

+24V

POUT

FSRTH

PFDRV

GND

POA

10

GND

DOSNSE

123456789

TB701J213

123456789

+8V

DOA

+12V

+5V

POSNS

DOSNSE

Density
Adj.

M1

PCB

J204

VR

GND

CNTD

FMDRV

123456789

J206

Optical Fiber

VR

GND

+24V

HVAC

+8V

HVDC

HVTI

HVD

10

HVT2

J205 J901

HVT3

123456789

+5V

+24V

OPSIZ2

OPSIZ1

OPSIZ0

OPMD

OPPOUT

OPCD

GND

12345

J210

COA

6

OAOBOA

OB

COB

GND

+24V

GND

+24V

GND

BLBLRRBLORBLBRY

123456789

J212

GND

GND

GND

+24V

+24V

+12V

+12V

GND

GND

+5V

+5V

FSRDRV

FSRDRV

DC Controller

SG

PPRDY

TOP

STS

CBSY

N.C.

VDO

CCLK

PRFD

N.C.BDRDY

SBSY

PCLK

PRNT

CPRDY

CMD

+5V

N.C.

N.C.

A1A2A3A4A5A6A7A8A9

1

1

2

2

3

3

4

4

LED Power
LED 1
LED 2
LED 3

J301

J803

B1B2B3B4B5B6B7B8B9

A10

I/O Board

B10

+5V

GND

APCIN

LSRPWR

1234567

1234567

J401 J202

Laser
Driver

VDOUT

GND

+8V

GND

SCNCLK

SCNTAC

SCNON

65432

65432

J301 J203

Scanner

Motor Unit

+12V

+5V

1

1

+5V

+24V

GND

RDYNH

LPC

+12V

123456789

J207

TSS

TSC

+8V

APCIN

10

TSTPE

11

TSTPNT

12

Personal LaserWriter LS

Wiring Diagram

K

Service Source

T ak e Apart

PLW SC/NT/NTR/LS

Take Apart Top Cover - 1

Top Cover

Top Cover

This topic applies to all
models of the printer.

No preliminary steps are
required before you begin
this procedure.

Take Apart Top Cover - 2

1 Open the front access

door.

2

Note:

There is a pin on
the inside of the rear
panel that seats in a
notch in the chassis. You
must shimmy the cover
about an inch toward the
rear of the printer to
unseat this pin before
you can lift off the cover.

Remove the two screws
and lift off the top cover.

Take Apart Front Cover - 3

Front Cover

This topic applies to all
models of the printer.

No preliminary steps are
required before you begin
this procedure.

1 Open the front access

door.

Front Cover

Take Apart Front Cover - 4

2 Remove the two screws

that secure the front

Holding

Tab

cover to the front access
door. Lift up the face­down delivery assembly
and using needlenose
pliers release the
holding tab.

3 Lift off the front cover.

Face-Down
Delivery
Assembly

Front Cover

Take Apart Front Cover - 5

Screw
Mount

Grooves

Right Holding Notch

Front Door

Replacement Note:

Lower
the multipurpose tray and
remove the face-up delivery
tray. Insert the right
holding tab first, then
swing the cover to the left,
making sure that the two
screw mounts align with the
grooves in the side of the
door. Press firmly until the
front cover snaps into place.

Take Apart LED Cover - 6

LED Cover

This topic applies to all
models of the printer.

LED Cover

Before you begin, remove
the front cover.

Take Apart LED Cover - 7

1 Remove the two screws

that secure the LED
cover to the front access
door.

LED Cover

Take Apart LED Cover - 8

2 Lift off the LED cover

and disconnect the LED
cable from the LED
holder.

LED Cable

Connector

Take Apart Cassette Feeder Tray - 9

Cassette Feeder Tray

This topic applies to all
models of the printer.

No preliminary steps are
required before you begin
this procedure.

Note:

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

Cassette Feeder Tray

Take Apart Cassette Feeder Tray - 10

1 Turn the printer upside

down so that it is resting
on its top.

2 Remove the four

mounting screws and
lift off the cassette

Cassette

Feeder

Tray

feeder tray.

Take Apart Pedestal Covers - 11

Pedestal Covers

Cassette

Stop

Cover

Left

Bottom

Cover

Right

Bottom

Cover

This topic applies to all
models of the printer.

Before you begin, remove
the cassette feeder tray.

Note:

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

Take Apart Pedestal Covers - 12

1 Unhook the spring from

the cassette feeder tray,

Cassette Stop Cover

and remove the cassette
stop cover.

Spring

Take Apart Pedestal Covers - 13

2

Caution:

Be careful not

to damage the cassette

Cassette

Microswitches

microswitches when
removing or replacing
the right bottom cover.

If you need to take apart
the right bottom cover,
remove the three
screws that secure it to
the cassette feeder tray.

3 Lift off the right bottom

cover.

Right Bottom Cover

Take Apart Pedestal Covers - 14

4 If you need to take apart

the left bottom cover,
remove the two screws
that secure it to the

Left Bottom Cover

cassette feeder tray.

5 Lift off the left bottom

cover.

Take Apart Cassette Feeder Roller Shaft - 15

Cassette Feeder Roller Shaft

This topic applies to all
models of the printer.

Before you begin, remove
the following:

• Cassette feeder tray

• Pedestal covers

Note:

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

Cassette Feeder Roller Shaft

Take Apart Cassette Feeder Roller Shaft - 16

1 Using a small

screwdriver or grip­ring pliers, remove the
E-rings at each end of

Feeder

Roller
Shaft

the feeder roller shaft
(opposite end not
shown).

E-Ring

2 Slide off the two white

gears.

White
Gears

Take Apart Cassette Feeder Roller Shaft - 17

3 Remove the holding pin.

4 Unhook the three plastic

feeder roller clamps

Feeder

Roller
Shaft

(rightmost clamp is
shown).

Roller

Clamp

Holding Pin

Take Apart Cassette Feeder Roller Shaft - 18

5 Slide the bushings off

each end of the feeder
roller shaft (opposite
end not shown) and

Feeder

Roller
Shaft

Bushing

remove the shaft from
the cassette feeder tray.

Take Apart Cassette Pickup Roller Shaft - 19

Cassette Pickup Roller Shaft

This topic applies to all
models of the printer.

Before you begin, remove
the following:

• Cassette feeder tray

• Pedestal covers

Note:

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

Cassette Pickup

Roller Shaft

and NTR models.

Take Apart Cassette Pickup Roller Shaft - 20

Pickup Roller

Shaft

Pickup Clutch Assembly

Setscrew E-Ring

1 Using a small

screwdriver or grip­ring pliers, remove the
E-rings at each end of
the pickup roller shaft
(opposite end not
shown).

2

Note:

Do not lose the
small metal holding pin
mentioned in the
following step. You will
need the pin when
replacing the pickup
roller.

Using a 1.5 mm Allen
wrench, loosen the
setscrew and remove the

Take Apart Cassette Pickup Roller Shaft - 21

clutch assembly. The
holding pin from the
roller shaft will fall into
your hand.

Take Apart Cassette Pickup Roller Shaft - 22

Pickup Roller

Shaft

Bushing

3 Slide the bushings off

each end of the pickup
roller shaft (opposite
end not shown) and
remove the shaft from
the cassette feeder tray.

Take Apart Cassette Pickup Roller Shaft - 23

Pickup Roller

Pickup Clutch Assembly

0.2 mm

Replacement Note:

When
replacing the pickup roller
shaft, give special care to
the following:

• Rotate the roller shaft
so that the crescent­shaped pickup rollers
protrude through the
sheet metal.

• Be careful not to let
the holding pin slide
out of the shaft when
sliding the pickup
roller clutch onto the
roller shaft.

• Place a 0.2-mm
thickness gauge
between the cassette

Take Apart Cassette Pickup Roller Shaft - 24

pickup roller clutch
and the E-ring.

• Adjust the setscrew so
that the distance
between the pickup
roller clutch and the
E-ring is 0.2 mm.
Then tighten the
setscrew into position.

Take Apart Cassette Feeder Board - 25

Cassette Feeder Board

Cassette Feeder

Board

This topic applies to all
models of the printer.

Before you begin, remove
the following:

• Cassette feeder tray

• Cassette stop cover

• Right bottom cover

Note:

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

Take Apart Cassette Feeder Board - 26

1 Remove the four black

screws that secure the
cassette feeder board to

Cassette Feeder Board

the feeder tray.

2 Disconnect connector

J902.

3 Remove the cassette

feeder board from the
cassette feeder tray.

J902

Cassette Feeder Tray

Take Apart I/O Board (SC, NT, NTR) - 27

I/O Board (SC, NT, NTR)

I/O Board (SC,
NT, NTR)

This topic applies to the only
SC, NT, and NTR models.

Before you begin, remove
the top cover.

Note:

If the I/O board is
removed from the printer,
the LEDs no longer function.

Take Apart I/O Board (SC, NT, NTR) - 28

1 Loosen the two screws

I/O Board

that secure the I/O board
to the shield.

I/O Shield

2 Handling the I/O board

only by the metal
bracket, carefully slide
the I/O board out of the
I/O shield.

Note:

Before returning an
I/O board to Apple, remove
the metal connector
bracket. Keep this bracket
and install it on the
replacement I/O board. If
you are replacing an NTR
board that has Rev. 4.0
ROMs, you need to remove

Take Apart I/O Board (SC, NT, NTR) - 29

the ROMs and install them on
the replacement board.
Refer to “NTR ROM
Upgrade” in Upgrades for
complete information.

Replacement Note:

Reinstall the I/O board
component-side down.

Take Apart I/O Shield (SC, NT, NTR) - 30

I/O Shield (SC, NT, NTR)

I/O Shield
(SC, NT, NTR)

This topic applies only to the
SC, NT, and NTR models.

Before you begin, remove
the following:

• Top cover

• I/O board

Take Apart I/O Shield (SC, NT, NTR) - 31

1 Remove the five

mounting screws and
lift the I/O shield from
the chassis.

I/O Shield

Take Apart End Plate (SC, NT, NTR) - 32

End Plate (SC, NT, NTR)

This topic applies only to the
SC, NT, and NTR models.

Before you begin, remove
the following:

End Plate

(SC, NT, NTR)

• Top cover

• I/O board

• I/O shield

Take Apart End Plate (SC, NT, NTR) - 33

1 Remove the four

mounting screws and
lift the end plate out of
the chassis.

End Plate

Take Apart I/O Shield (LS) - 34

I/O Shield (LS)

This topic applies only to the
LS model.

I/O Shield (LS)

Before you begin, remove
the top cover.

Take Apart I/O Shield (LS) - 35

1 Remove the seven screws

that secure the I/O
shield and lift the I/O
shield from the printer.

I/O Shield

Take Apart I/O Board (LS) - 36

I/O Board (LS)

This topic applies only to the

I/O Board (LS)

LS model.

Before you begin, remove
the following:

• Top cover

• I/O shield (LS)

Take Apart I/O Board (LS) - 37

1 Disconnect the cable

I/O Board

J803

from connector J803 on
the I/O board.

2 Remove the three screws

that secure the I/O board
in place.

3 Holding the board only

by the edges, disengage it
from the I/O bracket.
Gently lift straight up,
and disconnect the I/O
board from the
controller board.

Take Apart End Plate (LS) - 38

End Plate (LS)

End Plate (LS)

This topic applies only to the
LS model.

Before you begin, remove
the following:

• Top cover

• I/O shield (LS)

• I/O board (LS)

Take Apart End Plate (LS) - 39

1 Remove the five

mounting screws and
lift the end plate out of
the chassis.

Take Apart PCB Shield - 40

PCB Shield

This topic applies only to the
LS/L model.

PCB Shield

Before you begin, remove
the top cover.

Take Apart PCB Shield - 41

1 Remove the two screws

Duct Plate

that secure the duct plate
to the printer chassis.
Lift out the duct plate.

Take Apart PCB Shield - 42

PCB Shield

2 Remove the six screws

that secure the PCB
shield to the printer
chassis. Lift out the PCB
shield.

Take Apart Serial Controller - 43

Serial Controller

Serial Controller

This topic applies only to the
LS/L model.

Before you begin, remove
the following:

• Top cover

• PCB shield

Take Apart Serial Controller - 44

±

Warning:

Never
disconnect optical fiber
cable J204 when the
printer is powered on. Its
invisible laser beam can
damage your eyes.

1 Disconnect the following

cables from the serial
controller board:

• Laser assembly board
cable from J202

J204

J202

J206

J203

J205

J209

J208

J210

J212
J213

J215

• Scanner motor board

Serial Controller Board

cable from J203

• Optical fiber cable
from J204

• Cassette feeder board
cable from J205

Take Apart Serial Controller - 45

• High-voltage power
supply cable from
J206

• Paper pickup sensor
cable from J208

• Fuser assembly cable
from J209

J204

J206

J203

J205

J209

J208

J210

• Main motor cable

J202

J212
J213

from J210

• DC power supply
cable from J212

J215

• Fan-and-sensor
board cable from

Serial Controller Board

J213

• Status light cable
from J215

Take Apart Serial Controller - 46

2 Remove the four

mounting screws and
lift the board from its
mounting plate.

Take Apart Serial Controller Mounting Plate - 47

Serial Controller Mounting Plate

This topic applies only to the
LS/L model.

Before you begin, remove
the following:

Serial Controller
Mounting Plate

• Top cover

• PCB shield

±Warning: Never

disconnect optical fiber
cable J204 when the
printer is on. Its invisible
laser beam can damage your
eyes.

Take Apart Serial Controller Mounting Plate - 48

1 Disconnect the following

cables from the serial
controller board:

• Laser assembly board
cable from J202

J205

J206

J204

J203

J202

J209

J208

J210

J215

J212
J213

• Scanner motor board
cable from J203

• Optical fiber cable
from J204

• Cassette feeder board
cable from J205

• High-voltage power
supply cable from
J206

Serial Controller Board

• Paper pickup sensor
cable from J208

• Fuser assembly cable
from J209

Take Apart Serial Controller Mounting Plate - 49

• Main motor cable
from J210

• DC power supply
cable from J212

• Fan-and-sensor

J205

J206

J204

J203

J202

J209

J208

J210

J212
J213

board cable from
J213

• Status light cable
from J215

2 Remove the cables from

the cable retainer near
J212.

J215

Serial Controller Board

Take Apart Serial Controller Mounting Plate - 50

3 Remove the six screws

that secure the serial
controller mounting
plate to the chassis. Lift
the mounting plate out
of the printer.

Replacement Note: The
two metal tabs along the
rear mate into the
chassis on the LS/L
model.

Take Apart Fan - 51

Fan

This topic applies to all
models of the printer.

Before you begin, remove
the top cover.

Fan

Take Apart Fan - 52

1 Remove the two fan

J701

mounting screws.

2 Using small diagonal

cutters, carefullly cut
the tie-wrap that
secures the fan cable.

3 Disconnect fan

connector J701 from the
density-adjusting board.

Take Apart Fan - 53

4 Unlatch the holding tab

and lift out the fan
bracket and the fan.

Replacement Note:

• Install the fan with
the label facing out.

• Place the gold-colored
grounding plate over
the fan bracket.

Holding

Tab

Take Apart Sensor Mounting Plate - 54

Sensor Mounting Plate

Sensor Mounting Plate

This topic applies to all
models of the printer.

Before you begin, remove
the top cover.

Take Apart Sensor Mounting Plate - 55

1 Remove the two black

mounting screws and
washers and slightly lift
the sensor mounting
plate.

Sensor

Mounting

Plate

2 Disconnect connectors

J11 and J12 and lift out
the sensor mounting
plate.

Replacement Note:
Connect connectors J11
and J12 before seating
the sensor mounting
plate.

Connector

J12

Connector

J11