Apple Imagewriter Ii.L Service Manual

K

Service Source

ImageWriter II/L

Basics Introduction - 1

Introduction

The electrical operation of
the printer consists of five
printed circuit boards,
three motors, and several
switches.

The boards are the power
supply board, main board,
sub PCB board, print head
board, and the operation
panel board.

Basics Introduction - 2

The three motors are the
carrier motor, line feed
motor, and the ribbon
position motor.

Switches are the home
position switch, paper-out
sensor switch, and the
ribbon switch.

Basics Power Supply - 3

Power Supply

The ImageWriter II/L has a
switching type power supply
that eliminates the need for
a bulky transformer. When
the input AC current is
applied to this board, the
power supply reduces and
rectifies the voltage to the
following DC voltages:

• + 5 V DC

• – 5 V DC

• + 26 V DC

Basics Power Supply - 4

The + 5 and –5 V DC voltages
are for logic; the + 26 V DC
is for motor drive. All the
voltages are fed from
connector CN5 on the power
supply board to connector
CN3 on the main board.
From the main board the
voltages are distributed to
the other boards and motors.

Basics Power Supply - 5

The power supply has two
fuses to help protect the
electronics—FU1 is a 120 V
2-amp fuse and FU2 is a
125 V 4–amp fuse.

Note:

Although not on the
power supply board, there
is another fuse, FU1, located
on the main board that
protects the + 26 motor
voltage.

Basics Power Supply - 6

The on/off power switch is
connected to the power
supply board and disconnects
or connects the main AC
current to the board. The
switch is comprised of a
cable type plunger that is
attached to the power
supply board.

Caution:

is not compatible with the
older ImageWriter II. Do
not attempt to switch the
power supplies between
models.

This power supply

Basics Main Board - 7

Main Board

The main board is the heart
of the printer. Besides
handling the distribution of
the voltages, it also handles
all the logic that controls the
printer. It is also the source
of the drive signals for the
print head. All sensor
signals that affect the
operation of the printer are
fed to this board.

ImageWriter II/L Basics - 8

ROM

The ROM (IC10) chip has the start-up
routines and several features such as
character sets and self-test routines built
in.

RAM

The RAM (IC9) is used in the transfer of
data and acts as a buffer. When printing
starts, the data to be printed is transferred
from the host CPU to the RAM on the
printer. From the RAM the data is passed
through the logic and sent to the print head
to print. Turning off the printer clears the
RAM.

Interface Circuits

The interface circuits (IC2 and IC3) on the
main board handle the data transferred
from the host CPU via the sub PCB board.
These circuits also handle the status and
control lines from the printer to the host
CPU.

Print Head Drivers

The print head drivers (IC5 and IC6)
process the print head drive signals from
the CPU and gate array. The signals are sent
to the print head board through CN5.

ImageWriter II/L Basics - 9

CPU and Gate Array

The CPU (IC8) along with the gate array
(IC4), handles the logic and decision­making of the printer. They combine to
evaluate the status of the printer and issue
commands concerning when to transfer
data, when to start printing, when to run
the motors, and what actually prints. All
the functions of the printer are controlled
by these two devices. The rest of the
circuits are supporting circuits.

Carrier Motor Drivers

The carrier motor circuit is made up of
transistors Q1, Q2, Q12, Q13 and IC1. The
transistors make up a circuit that is used as
common returns from the motor. The
transistors also supply the higher voltage
and current needed to drive the motor. IC1
is a transistor pack that completes the
drive signals circuit when turned on. Each
of the four signals drives a phase of the
motor. These drive signals go to the carrier
motor on the printer through CN2.

ImageWriter II/L Basics - 10

Line Feed

The drive circuit is made up of transistors
Q8, Q9, Q10, and Q11. Four drive signals
from the gate array are processed in this
circuit. Higher voltage and current are
added to the phase control signals to turn on
the line feed motor. The signals are sent to
the line feed motor and the ribbon motor
through CN1.

Ribbon Motor Drivers

This circuit is made up of transistors Q3,
Q4, Q5, Q6 and Q7. When turned on, the line
feed motor signals from the gate array are
supplied with more current in the drive
circuit and sent out to the motor. The
common return line is on Q7, which is
turned on for each phase signal sent to the
motor. These signals are sent through CN5.

ImageWriter II/L Basics - 11

Reset Circuit

This circuit is used when the printer is
turned on to keep the logic in a reset state
until the voltages are up to correct values.
Once the voltages are at the correct level,
reset is released and the logic is allowed to
start functioning from a known state.

Connector CN6

This connector is a LocalTalk option card
connector. This card allows the printer to
communicate on the LocalTalk network so
that multiple users can use the printer.

Clock Crystals

There are two clock crystals on the main
board. The clock X1 for the gate array IC4
runs at 17.2 MHz. The clock X2 for the CPU
runs at 12 MHz.

DIP Switches

The configuration DIP switches are mounted
on the main board and can be changed to
make the printer perform in different
modes, or control printer protocols. The
switch settings affect both the CPU and the
gate array logic.

Basics Sub PCB Board - 12

Sub PCB Board

The sub PCB board acts as an
interface board. The
interface cable from the host
CPU is plugged into the
connector CNS1 on this
board. The signals from the
host CPU pass through the
sub PCB board on their way
to the main board. If a cut­sheet feeder is attached to
the printer, the signals
pass through the sub PCB
board through CNS2, which
controls the actions of the
feeder.

Basics Sub PCB Board - 13

The paper-out sensor wires
go to this board through
CNS3 and are passed along to
the main board.

All the signals coming or
going to the sub PCB board
are sent through CNS4 and
the ribbon cable to the main
board at connector CN4.

Basics Print Head Board - 14

Print Head Board

The print head board
receives the print head
drive signals from the main
board through CNH1. The
signals are then sent out on
connector CNH2 to the print
head. This board also handles
the ribbon motor drive
signals and the ribbon
switch signals. If the switch
is activated, a color ribbon
is detected.

Basics Print Head Board - 15

This information is sent to
the main board, which in
turn sends controlling
signals to the ribbon motor
to control the position of the
ribbon to allow color
printing.

The home position switch
alerts the CPU that the
carriage is at the far left
side of the printer, which is
home position.

Basics Operation Panel Board - 16

Operation Panel Board

The operation panel board
has the switches (select,
print quality, line feed, and
form feed) and indicators
(error, power, print
quality, and select) mounted
on it. It interfaces with the
CPU through CN7 on the
main board. While the power
switch button is located on
the operation panel, it is not
connected to the operation
panel board.

Operation Panel

Basics Operation Panel Board - 17

The switch button just
passes through to the switch
mounted on the main frame
underneath the operation
panel.

Operation Panel

Basics Operation Panel - 18

Operation Panel

The operation panel consists

Indicator

Lights

Operating
Switches

of operating switches and
indicator lights.

The operating switches are
the buttons with which you
control the printer, and the
indicator lights let you know
what state the printer is in.

Basics Operation Panel - 19

Operating Switches

Power Switch

Power Switch

switch turns the printer on
and off.

- The power

Basics Operation Panel - 20

Select

Switch

Select Switch

- The select
switch toggles the printer
between a selected (online)
and a deselected (off-line)
state. If printing is in
progress when the select
switch is pressed, the
printer finishes printing
the current line and a
maximum of two additional
lines, and stops printing.

Basics Operation Panel - 21

If you want to clear the
buffer, you must turn off
the printer. Pressing the
select switch also clears a

Select

Switch

corrected error condition.
If an out-of-paper
condition exists, pressing
the select switch
temporarily overrides the
error to allow the print of
one line. This process is
repeatable as long as there
is printable data in the
printer buffer.

Basics Operation Panel - 22

Print

Quality

Print Quality Switch

- The
print quality switch allows
the user to choose one of
three printing modes.
Pressing the print quality
switch repeatedly changes
the mode from the standard
print mode, to the NLQ print
mode, to the draft print
mode, back to the standard
print mode again. The print
quality switch does not
function unless the printer
is in an off-line
(deselected) state.Ê

Basics Operation Panel - 23

Form

Feed

Form Feed

- The form feed
switch does not function
unless the printer is in an
off-line (deselected) state.
When the form feed switch
is pressed, the printer
feeds paper until the next
top of form is reached.

Basics Operation Panel - 24

If the switch is pressed and
no paper is present, the
printer assumes a single
sheet is being loaded. The
printer feeds the single

Form

Feed

sheet up to the top of form
position. If the switch is
pressed and paper is
present, the printer
monitors the paper-off
switch while feeding paper.
If the printer detects an
out-of-paper condition
before the top of form is
reached, the printer
assumes that single sheets
are being fed.

Basics Operation Panel - 25

For the single sheet case,
four inches of paper motion
is added to the form feed to
ensure that the page is
properly ejected.

Form

Feed

Basics Operation Panel - 26

When an automatic cut­sheet feeder is present, the
paper-loading sequence is
slightly different. When the
form feed is pressed with no

Form

Feed

paper present, the printer
first rolls the platen to
check if a single sheet had
been inserted. If no paper is
found, the printer loads a
sheet from the automatic
sheet feeder and positions it
at the top-of-form position.

Basics Operation Panel - 27

Indicators

Select

Power

Power

light indicates that power is
on.

Select

indicator is lit, the printer
is online, in a ready state so
that a transmission can take
place.

- When lit, the power

- When the select

Basics Operation Panel - 28

Print

Quality

Print Quality

- The print
quality light indicates three
modes of operation:

• NLQ–When both the
left and right
indicators are lit, the
printer is in the Near
Letter Quality print
mode.

• Draft–When just the
left indicator is lit,
the printer is in the
Draft print mode.

Basics Operation Panel - 29

• Standard–If the right
indicator is lit, the
printer is in the
Standard print mode.

Print

Quality

This is the default
mode when the
printer is turned on.

Basics Operation Panel - 30

Error

- The error light has
three ways of indicating an
error condition in the
printer:

Error

• If the error light comes

on steady and stays on
(and the select light goes
off), the printer is out of
paper.

• If the light blinks in a

steady fashion (evenly
spaced blinks), a cover
is open or a left-margin
error has occurred.

Basics Operation Panel - 31

• If the light blinks in a
repeating sequence of
one short blink and a
long blink, an

Error

interface
communication or a
RAM check error has
occurred.

K

Service Source

Specifications

ImageWriter II/L

Specifications Characteristics - 1

Characteristics

Print Methods

Throughput

Print Head

Response Time

Draft Mode: 250 characters per second (cps); 25 in. per second

(ips) at 10 characters per in. (cpi)
Standard Mode: 180 cps; 18 ips at 10 cpi
NLQ Mode: 25 cps
100 in. per minute (ipm) at 80 dpi

9 wires

.0139 in. (.353 mm) nominal
Standard:.0118 in. (.300 mm) nominal
Japan:.0098 in. (.250 mm) nominal

1440 Hz

Specifications Characteristics - 2

Life

Graphics Duty Cycle

Character Sets

Ribbon

Standard: 4 by 108 strokes/wire
Japan: 2 by 108 strokes/wire

25% minimum

ASCII (96 characters)
Six European sets
MouseText (32 characters)

Fabric ribbon
Black or four-color (cannot use color with Kanji print head)

Specifications I/O Interfaces - 3

I/O Interfaces

Interface

LocalTalk

Operation

Connectors

Data Format

Standard asynchronous

With option board

Asynchronous, switch selectable; Data ready/busy (hardware

handshake), or Xon/Xoff serial protocols

Mini DIN-8
26-pin male (optional)

Asynchronous serial/no parity bit shall be sent

Specifications I/O Interfaces - 4

Transmission Speed

Input Buffer

Switch selectable (300, 1200, 2400, and 9600 baud)

254K

Specifications Paper Feed - 5

Paper Feed

Method

Accessories

Direction

Type

Thickness

Friction feed, adjustable tractors, and automatic single-sheet

loader

Automatic, cut-sheet feeder

Bidirectional (friction feed or tractor feed)
Single sheets, sprocket feed, multicopy (original + three copies),
single-width labels

.002–.011 in. (.05–.28 mm) equivalent to 15–25 lb. bond

3.5 in. minimum to “n” in. maximum (“n” is typically 11 or 14

for cut sheets)

Specifications Electrical - 6

Electrical

Line V oltage

USA/Japan: 85–132 VAC; 48–62 Hz
Europe/Australia: 185–265 VAC; 48–62 Hz

Stand-by:20 W maximum
Operation: 180 W maximum

Specifications Physical - 7

Physical

Dimensions

Weight

Height: 5 in.
Width: 17 in.
Depth: 12 in.

25 lb. maximum

Specifications Environmental - 8

Environmental

Temperature

Relative Humidity

Operation:10–40°C
Storage: (one year) –40 to 47°C
Transit: (72 hours) –40 to 65°C

Storage: (six months) 10–95%

K

Service Source

Troubleshooting

ImageWriter II/L

Troubleshooting General/ - 1

General

The Symptom Charts included in this chapter will help you
diagnose specific symptoms related to your product. Because cures
are listed on the charts in the order of most likely solution, try
the first cure first. Verify whether or not the product continues to
exhibit the symptom. If the symptom persists, try the next cure.
(Note: If you have replaced a module, reinstall the original module
before you proceed to the next cure.)

If you are not sure what the problem is, or if the Symptom Charts
do not resolve the problem, refer to the Flowchart for the product
family.

For additional assistance, contact Apple Technical Support.

Troubleshooting Symptom Charts /Preliminary Check - 2

Symptom Charts

Preliminary Check

Error light blinks 1 Verify that paper cover is secure.

2 Verify that paper cover magnet is in place.
3 Try known-good software.
4 Verify that option card dip switch SW2-4 is open/off with

no card installed.

Select light off, error light on

Select light does come on1 Verify that paper cover is secure.

1 Add paper or reset paper feed tray.
2 Verify that paper-out sensor works correctly (see Take

Apart).

2 Verify that paper cover magnet is in place.
3 Verify that operation cable under top cover is secure.

Troubleshooting Symptom Charts /Preliminary Check - 3

No printing or garbled printing

Software-specific problem

Prints OK for a while; then prints garbage

Overprinting Verify that program is set for correct line spacing and line length.

Light printing 1 Change ribbon cartridge.

1 Check interface cable connection between printer and

computer.

2 Verify that DIP switches (2-1 through 2-4) are set

correctly.

Try known-good software.

Set DIP switch SW2-3 to correct serial protocol.

2 Adjust impression lever (see Adjustments).
3 Check for excessive play in carrier assembly. Make sure

assembly is seated correctly (see Take Apart).

Troubleshooting Symptom Charts/Preliminary Check - 4

Erratic carrier motion, loud hum

Printing has
squashed lines;
misregistration
problems with pin
feed paper

Remove black tube-shaped shipping protection from carrier
shaft.

1 For best print quality, instruct customer to place stack of

paper behind printer and no more than three feet below
printer. The paper should have a clear, unobstructed entry
and exit path.

2 Verify that power cord or printer cable does not obstruct

paper path.

3 Avoid printing in top and bottom one inch of paper (the areas

where squashed line and misregistration problems will be
most apparent).

4 Use 20-pound paper.

Troubleshooting Symptom Charts /Print Quality - 5

Print Quality

Compressed first or second line

Print is darker or lighter on one side

Top row of dots missing on printout

Power light on, no printing

1 Check position of paper behind printer to ensure there isn’t

anything blocking paper entry or exit.

2 Replace main board.

Remove or install shims. See the Shims topic in the Additional
Procedures chapter.

Perform “Ribbon Adjustment” (refer to Adjustments).

1 Verify that ribbon frame assembly rides on the spiral ridge

on color ribbon cam (see Adjustments).

2 Remove dot head and verify that pins in the connector on dot

head board are not bent.

3 Go to “Indicator Lights” (see Flowcharts).

Troubleshooting Symptom Charts/Print Quality - 6

Missing dots 1 Check flexible cable connection.

2 Remove dot head and verify that pins in connector on dot head

board are not bent.

3 Go to “Printing” (see Flowcharts).

Color self-test does not work

When printing from a
Macintosh, characters
sometimes appear
smudged, or top of
form gradually creeps
down page in one-line
increments

1 Verify that color ribbon detect switch operates and wires are

unbroken. If defective, replace switch.

2 Top plate of carrier assembly (under ribbon cartridge) is

not properly engaged with color ribbon cam (see Take Apart
or Adjustments).

Verify that ImageWriter II/L driver software is the most current
version.

Troubleshooting Symptom Charts /Carriage Movement - 7

Carriage Movement

Carriage doesn’t move; LEDs are not lit

Carriage doesn’t move; LEDs are lit

Carriage assembly
moves to the left and
does not return to
center

1 Replace main board.
2 Replace power supply board.

1 Replace main board.
2 Replace power supply board.

1 Verify operation of switch on print head board. If switch is

frozen or defective, replace print head board.

2 Verify that metal tab actuating left-side home position

switch is bent correctly. Use a feeler gauge and bend tab 1

mm toward right side.
3 Replace main board.
4 Replace power supply board.
5 Replace flexible ribbon cable.

Troubleshooting Symptom Charts/Carriage Movement - 8

Carriage moves to the left and hums very loudly

Carriage assembly grinds or is difficult to move

Carrier binds on left side

Carrier
intermittently locks
up and gives light or
dark print

1 Verify that flexible ribbon cable is properly connected to

main board and to its connector under carriage assembly on

print head board.
2 Replace flexible ribbon cable.
3 Replace power supply board.

1 Replace fuse on main board.
2 Replace power supply board.

Paper guide is too close to platen. Readjust paper guide.

Verify that rear of carrier assembly does not lift. If it does, it is
not seated correctly in the guide rail. Gently push down on rear of
carrier assembly until it snaps into place.

Troubleshooting Symptom Charts/Carriage Movement - 9

Self-test produces no
carrier movement
(LEDs are lit)

1 Remove mechanical assembly to ensure that wires to carrier

motor are not pinched. If wires to carrier motor are worn,

replace them.
2 Replace fuse on main board.
3 Replace main board.

Troubleshooting Symptom Charts/Paper Feed - 10

Paper Feed

Grinding during paper feed

Paper adjustment lever does not move

1 Remove platen knob to verify that there are no obstructions

in the gears beneath knob.
2 Adjust paper guide (refer to Adjustments).
3 Replace line feed motor.
4 Replace main board.

Verify that power on/off cable is not pinched between lever and
metal frame or plastic case.

Troubleshooting Symptom Charts/Miscellaneous - 11

Miscellaneous

Hexadecimal data prints

Power supply goes bad repeatedly

Ribbon jams or does not advance

Power printer off and then on.

Verify that power supply and motor wires are not pinched. If
wires are pinched, lift mechanical assembly and reposition wires.

1 Check gear box on carrier assembly. Verify that gear with

cross (+) sticks through carrier assembly top plate and

engages ribbon cartridge.
2 Verify that ribbon wire is properly installed in gear box
3 Verify that print head wires are not striking platen too hard.

If they are, replace main board. If replacement of main board

does not correct problem, reinstall original main board and

replace print head.

K

Service Source

T ak e Apart

ImageWriter II/L

Take Apart Covers - 1

Covers

Top Cover

Ribbon Cartridge

Ribbon Cover

Paper Cover

Tractor Cover

No preliminary steps are
required before you begin
this procedure.

Caution:

precautions in Bulletins/
Safety.

Note:

the removal of the top cover,
tractor cover, ribbon cover,
and ribbon cartridge.

Note:

easier, label all cables and
connectors during the take­apart procedure.

Review the ESD

This procedure covers

To make reassembly

Take Apart Covers - 2

Paper Cover

Ribbon Cover

Note:

The paper cover

Paper Cover

assembly must be in place
for the printer to work.

Gently pull the paper cover
up and forward and remove
the cover.

Replacement Note:

the paper cover from the
ribbon cover only if the
paper cover is broken and
needs replacement. Push in
the two tabs and separate the
paper cover from the ribbon
cover.

Remove

Take Apart Covers - 3

Ribbon Cartridge

Gently pull the tabs apart

Tab

Tab

Ribbon Cartridge

and lift the cartridge out.

Take Apart Covers - 4

Top Cover

Captive
Screw

Platen

Knob

Captive
Screw

1 Push the carrier

assembly to the far left.

2 Pull off the platen knob.

3 Loosen the two captive

screws.

Take Apart Covers - 5

4 Grasp the top cover on

the left at the part that
goes over the leg.

Latch

5 Release the latch and lift

the cover one inch.

Top Cover

Take Apart Covers - 6

6 Gently rotate the cover

toward the front and
turn the cover over.

7 Using your thumb and

forefinger, unlock
connector CN7 and
remove the ribbon cable.

8 Lift off the top cover.

Replacement Note:

Perform the self-test.

Connector CN7

Take Apart Covers - 7

Tractor Cover

Tractor Cover

Gently pull the tractor cover
up and forward until the
cover snaps free.

Take Apart Operation Panel - 8

Operation Panel

Before you begin, remove
the covers.

Operation Panel

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Take Apart Operation Panel - 9

Cable

Top Cover

Right-

1 Remove the three screws

and lift the operation
panel board from the top
cover.

2 Disconnect the cable

from the operation
panel board.

Operation
Panel
Board

-Left

Take Apart Operation Panel - 10

3

Note

: To make
reinstallation easier,
observe the position of
the power switch

Power

Switch

Plunger

plunger and spring.

Remove the spring and
power switch plunger
from the top cover.

Replacement Note:

Perform the self-test.
See the Additional
Procedures chapter.

Top Cover

Take Apart Main Board - 11

Main Board

Before you begin, remove
the following:

• Covers

• Option board

Main Board

Caution:

precautions in Bulletins/
Safety.

Review the ESD

Take Apart Main Board - 12

1 Disconnect the three

cable connectors from
the left side of the main
board:

• CN1

• CN2

• CN3

Right-

Main Board

Take Apart Main Board - 13

2 Remove the six screws.

3 Tilt the front half of the

board up and gently lift
the board partially out.

Ground Clip

Main Board

Replacement Note:

Make
sure to replace the
ground clip on the screw
at the lower left of the
board.

Take Apart Main Board - 14

4

Caution:

release both sides of the
connector before you
pull out the ribbon
cable.

Using a small
screwdriver, unlock
each side of connectors
CN4 and CN5 and
remove the two ribbon
cables.

Make sure you

Replacement Note:

Perform the self-test.

Take Apart Print Head and Paper Guide - 15

Print Head and Paper Guide

Before you begin, remove
the covers.

Caution

precautions in Bulletins/
Safety.

Note

have to be removed in order
to remove the paper guide.

: Review the ESD

: The print head does not

Take Apart Print Head and Paper Guide - 16

Print Head

1 Lift the paper bail to its

highest position.

2 Set the paper thickness

lever to its widest
setting.

Take Apart Print Head and Paper Guide - 17

3 Gently push and hold

aside the white print
head clamp release
lever and slowly lift the
print head straight out of
the connector.

Replacement Note:

Perform the self-test.

Take Apart Print Head and Paper Guide - 18

Paper Guide

Remove the two screws and
lift out the paper guide.

Replacement Note:

the paper guide. See the
Adjustments chapter.

Adjust

Take Apart Ribbon Cam Assembly - 19

Ribbon Cam Assembly

Before you begin, remove
the covers.

Caution

precautions in Bulletins/
Safety.

Note

of the ribbon cam assembly.
One has a plastic cap and the
other has a hex nut, without
the cap.

: Review the ESD

: There are two versions

Take Apart Ribbon Cam Assembly - 20

1 Unscrew the plastic cap

Plastic Cap

from the ribbon cam.

2 Remove the red

Adjustment Ring

adjustment ring and the
spring.

Spring

Plastic Collar

3 Remove the plastic

collar.

Take Apart Ribbon Cam Assembly - 21

4

Note

: For versions with
the hex nut, remove the
nut and proceed with the
rest of the procedure.

Using small needlenose
pliers, remove the
retaining clip and two
washers.

5 Remove the vertical

knurled nut.

Take Apart Ribbon Cam Assembly - 22

6 Turn and lift off the

ribbon cam.

7 Remove the spring.

Take Apart Ribbon Cam Assembly - 23

Replacement Note:

you replace the cam, set the
cam at its lowest setting.
Verify that the two tabs of
the ribbon plate are riding
on the cam ridge. Improper
positioning of the cam can
cause poor-quality prints or
no prints.

Replacement Note

the ribbon cam (see
“Ribbon Cam” in the
Adjustments chapter).

When

: Adjust

Take Apart Carrier Assembly Top Plate - 24

Carrier Assembly Top Plate

Before you begin, remove
the covers.

Caution

precautions in Bulletins/
Safety.

: Review the ESD

Take Apart Carrier Assembly Top Plate - 25

1

Caution

when you remove the
black plastic arms. You
will break them.

Using a small flat-blade
screwdriver, push out
the black bearing arm.

2 With another small

screwdriver, gently pry
the arm upward at a
slight angle.

3 Move the small arm to

the top.

: Do not use force

Take Apart Carrier Assembly Top Plate - 26

4 Gently pull the plastic

bearing straight out and
remove the small
washer.

5 Repeat for the right side.

Replacement Note

bearings are not
interchangeable.

: The

Take Apart Carrier Assembly Top Plate - 27

6 Gently pry the top of the

wire clamp from the
carrier assembly and
remove the color ribbon
detect switch wires from
the clamp.

Take Apart Carrier Assembly Top Plate - 28

7 Using a jeweler’s

screwdriver, push the
gear assembly tabs
toward the center of the
ribbon plate and lift off
the top plate. Leave the
gear assembly in the
carrier housing.

Take Apart Carrier Assembly Top Plate - 29

Color Ribbon Detect Switch

1

Note:

Do not bend the
plastic tabs that hold the
wires.

Carefully pry the wires
out of the embedded track
of the top plate.

Take Apart Carrier Assembly Top Plate - 30

2 Turn over the top plate.

Using a small
screwdriver, gently pry
the four latches and at
the same time push
down on the bottom of the
switch so the switch
comes out from the top of
the plate.

Take Apart Ribbon Wire and Gears - 31

Ribbon Wire and Gears

Before you begin, remove
the following:

• Covers

• Carrier assembly top
plate

Caution

precautions in Bulletins/
Safety.

: Review the ESD

Take Apart Ribbon Wire and Gears - 32

1 Unhook the ribbon wire

from the right side of the
frame, and then from the
left side of the frame.
Remove the ribbon wire.

Take Apart Ribbon Wire and Gears - 33

2 Lift the gear assembly

from the carrier
housing.

Replacement Note:

Perform the self-test.

Replacement Note:

sure the wire is
rewrapped with the wire
crossing in front of the
gear. Then secure the
wire on the right side.

Be

Take Apart Drive Belt/Carrier Motor - 34

Drive Belt/Carrier Motor

Before you begin, remove
the covers.

Caution

precautions in Bulletins/
Safety.

: Review the ESD

Take Apart Drive Belt/Carrier Motor - 35

Drive Belt

1 Loosen the screw on the

pulley tension plate. Do
not remove the screw.

2 Using a large

screwdriver, push
toward the right side
and remove the drive
belt from the right-side
pulley.

Adjustment
Screw

Right Side
Pulley

Carrier
Pulley Arm

Take Apart Drive Belt/Carrier Motor - 36

3 Remove the drive belt

from the left-side
pulley.

Take Apart Drive Belt/Carrier Motor - 37

4 Remove the screw from

the retaining clip.

5 Using a small flat-blade

screwdriver, pry up the
retaining clip from the
housing and remove the
belt.

Replacement Note:

retaining clip is glued to
the drive belt.

The

Take Apart Drive Belt/Carrier Motor - 38

Carrier Motor

Remove the three screws
that secure the carrier
motor and remove the
carrier motor.

Replacement Note:

the self-adhesive damping
pad between the motor and
the frame. Replace the pad if
necessary.

Inspect

Take Apart Mechanical Assembly - 39

Mechanical Assembly

Before you begin, remove
the covers.

Caution: Review the ESD
precautions in Bulletins/
Safety.

Take Apart Mechanical Assembly - 40

1 Remove the six screws

that hold the mechanical
assembly to the bottom
case.

Note: Do not remove
screw A at the back of the
assembly nearest the left
side. This screw holds
the sub board in place.

Take Apart Mechanical Assembly - 41

Replacement Note: Two
screws make the ground
connection between the
power supply plate and the
rest of the mechanical
assembly. If you do not
replace both screws, the
ground is not complete and
logic errors or hazards can
result.

Take Apart Mechanical Assembly - 42

2 Remove the two screws

that hold the power
switch cable in place.

3 If the main board is in

the printer, disconnect
the connector at CN3 on
the main board.

Take Apart Mechanical Assembly - 43

4 Grasp the middle of the

back tractor bar. With
the other hand hold the
middle of the support
wall and lift the entire
mechanical assembly
from the case.

Take Apart Mechanical Assembly - 44

Replacement Note: As you
lower the assembly into
place, make sure to route
the power supply cable
correctly and to align the
power switch cable
correctly. Correct
placement will ensure that
the cables do not pinch when
you lower the assembly into
place.

Take Apart Flexible Ribbon Cable - 45

Flexible Ribbon Cable

Before you begin, remove
the following:

• Covers

• Mechanical assembly

• Carrier assembly top
plate

Caution: Review the ESD

Flexible Ribbon Cable

precautions in Bulletins/
Safety.

Take Apart Flexible Ribbon Cable - 46

1 Remove the ribbon cable

from connector CN5 on
the main board.

2 Move the carrier

assembly toward the
right side of the carrier
until the assembly is
lined up with the right
edge of the board.