Apple Audiovision 14 Display Service Manual

K

Service Source

Apple AudioVision 14

Display

K

Service Source

Basics

Apple AudioVision 14 Display

Basics Self-Threading Screws - 1

Self-Threading Screws

Caution:

damage the AudioVision 14 Display. Thread the screws
properly and do not overtighten them.

The AudioVision 14 Display uses both machine screws and
self-threading screws. Be aware of the following guidelines
when you are replacing a self-threading screw:

• Never overtighten self-threading screws.

• Before tightening a self-threading screw, back the screw

Improperly installed self-threading screws could

off slightly to be sure it is threaded properly.

Basics Self-Threading Screws - 2

Machine Screw

Self-Threading Screw

K

Service Source

Specifications

Apple AudioVision 14 Display

Specifications Characteristics - 1

Characteristics

Picture Tube

Screen Resolution

Scan Rates

Active V ideo Display Area

14-inch diagonal, 13-inch viewable screen
Trinitron CRT
.26-mm pitch aperture grille

640x480

Horizontal scan rate: 35.0 kHz
Vertical refresh rate: 66.7 Hz

9.3 in. by 6.9 in.
(235 mm by 176 mm)

Specifications Characteristics - 2

Video Input Signals

Audio Input Signals

Microphone

Speakers

Red, green, and blue video signals;.714 V peak to peak; white

positive

Composite synchronization, negative-going TTL

Accepts audio signal of up to 6 Vpp (line level—low sensitivity) or

as low as 20 mVpp (microphone level—high sensitivity)
without clipping the signal, depending upon the level and
sensitivity setting

Directional, optimized for use in speech recognition and other
voice-related applications

Stereo, with ported (base reflex) chamber design
Minimum loudness: 90 dB SPL at 1 kHz at 0.5 m
Frequency response: 100 Hz–15 kHz ± 3dB

Specifications Characteristics - 3

Headphone Jack

Output level: 1.75 Vpp into 4 ohm load and 2 Vpp into 10 k ohm

load

Specifications Controls - 4

Controls

User Controls

Front Keypad: Contrast, brightness, and volume keys; mute

button; microphone button

Back panel: On/off switch

Specifications Electrical - 5

Electrical

Voltage

Frequency

Power

100–240 VAC ± 10%

50–60 Hz ± 3%
55 W maximum, all line conditions

The monitor contains internal power-line fuse protection.
This fuse should be replaced with the same type by a qualified

service technician.

Specifications Physical - 6

Physical

Size

Weight

W arm-Up Time

Height: 13 in. (330 mm)
Width: 13.5 in. (344 mm)
Depth: 15.5 in. (394 mm)

33 lb. (15 kg)

20 minutes required to meet all specifications

Specifications Environmental - 7

Environmental

Operating Temperature

Relative Humidity

50–104°F (10–40°C)

90% maximum, noncondensing

K

Service Source

Troubleshooting

Apple AudioVision 14 Display

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/No Raster - 2

Symptom Charts

No Raster

No raster, LED off 1 Ensure monitor’s video cable is connected to the computer or

the video card in the computer.
2 Check power cable connections and power switch.
3 Check all connections on main board.
4 Replace blown fuse.
5 Replace main board.

No raster, LED on,
CRT filament on

1 Ensure monitor’s video cable is connected to the computer or

the video card in the computer.
2 Adjust contrast and brightness knobs.
3 Connect known-good monitor and verify that built-in video

signal or video card is working properly.
4 Check all connections on main board. Make sure video

connector is secure and wires are inside plastic connector.
5 Perform video adjustments. Refer to “Video” in Adjustments

chapter.
6 Replace main board.
7 Replace CRT.

Troubleshooting Symptom Charts/Geometry - 3

Geometry

Raster too short, tall,
narrow, or wide

Raster not centered 1 Move unit away from monitors, fluorescent lights, or other

Horizontal linearity
bad (size of text
differs at sides of
screen)

1 Adjust vertical or horizontal size controls. Refer to

“Geometry” in Adjustments chapter.
2 Replace main board.

electrical equipment.
2 Adjust vertical or horizontal center controls. Refer to

“Geometry” in Adjustments chapter.
3 Replace main board.

Replace main board.

Troubleshooting Symptom Charts/Geometry

(Continued) - 4

Vertical linearity bad
(size of text differs at
top vs. bottom of
screen)

Abnormal or
distorted raster

Geometry

Replace main board.

1 Move unit away from monitors, fluorescent lights, or other

electrical equipment.
2 Perform geometry adjustments. Refer to “Geometry” in

Adjustments chapter.
3 Replace main board.
4 Replace CRT (rarely required).

(Continued)

Troubleshooting Symptom Charts/Geometry

(Continued)

- 5

Geometry

Entire raster is tilted 1 Move unit away from monitors, fluorescent lights, or other

electrical equipment.
2 Perform geometry adjustments. Refer to “Geometry” in

Adjustments chapter.
3 Perform geometric distortion adjustments. Refer to

“Geometric Distortion” in Adjustments chapter.
4 Replace main board.

(Continued)

Troubleshooting Symptom Charts/Synchronization - 6

Synchronization

Picture breaks into
diagonal lines

Picture rolls
vertically

Picture breaks and
rolls horizontally

1 Connect known-good monitor and verify that built-in video

signal or video card is working properly.
2 Replace main board.

1 Connect known-good monitor and verify that built-in video

signal or video card is working properly.
2 Replace main board.

1 Connect known-good monitor and verify that built-in video

signal or video card is working properly.
2 Replace main board.

Troubleshooting Symptom Charts/Synchronization

(Continued)

- 7

Black raster with
single vertical or
horizontal line

Synchronization

1 Replace main board.
2 Replace CRT.

(Continued)

Troubleshooting Symptom Charts/Video - 8

Video

Raster too dark, too
bright, or washed out

Out of focus 1 Perform focus adjustment. Refer to “Video” in Adjustments

1 Adjust external contrast and brightness controls.
2 Connect known-good monitor and verify that built-in video

signal or video card is working properly.
3 Perform video adjustments. Refer to “Video” in Adjustments

chapter.
4 Replace main board.
5 Replace CRT (rarely required).

chapter.
2 Replace main board.
3 Adjust focus controls to their limits. If bad focus remains on

one part of display, replace CRT.

Troubleshooting Symptom Charts/Video

(Continued)

- 9

Predominant color
tint

Out of convergence
(color bleeding out
from text or lines)

Video

1 Check video card in computer.
2 Perform video adjustments. Refer to “Video” in Adjustments

3 Replace main board.
4 Replace CRT (if you cannot eliminate red, green, or blue

1 Connect known-good monitor and verify that built-in video

2 Perform convergence adjustments. Refer to “Video” in

3 Replace main board.
4 Replace CRT.

(Continued)

chapter.

tint).

signal or video card is working properly.

Adjustments chapter.

Troubleshooting Symptom Charts/Audio - 10

Audio

Sound comes out of
only one speaker

Internal microphone
doesn’t record

No sound or volume is
too low

One of sound output options may be set to Stereo when your
computer is only capable of Mono sound output.

1 To turn on microphone, press microphone button on keypad.

Microphone-on LED lights up when microphone is on.
2 Make sure that monitor is selected as sound input and

playback source.

1 Verify that external sound sources are securely connected to

monitor’s sound-out port.
2 Press volume key on keypad.
3 Press mute button to turn mute off.
4 Press microphone button to turn microphone off.

Troubleshooting Symptom Charts/Miscellaneous - 11

Miscellaneous

Picture jitters or
flashes

Intermittently shuts
down

Flashing or wavy
screen

Black screen spots
(burnt phosphor)

1 Move unit away from monitors, fluorescent lights, or other

electrical equipment.
2 Check that all ground cables are secure.
3 Replace main board.

Replace main board.

Replace main board.

Replace CRT.

Troubleshooting Symptom Charts/Miscellaneous

(Continued)

- 12

Miscellaneous

Monitor emits high­pitched noise

Does not degauss Replace main board.

Erratic or no
communication with
ADB device

Moving and clicking a
Logitech mouse has no
effect on screen, but
keyboard input is
accepted

Replace main board.

Replace keyboard cable, keyboard, mouse, or other ADB device.

Some models of Logitech mice are incompatible with this display.
Refer customers to Logitech for information on mouse
compatibility and upgrades. The display is not at fault; do not
replace it.

(Continued)

Troubleshooting Symptom Charts/Miscellaneous

(Continued)

- 13

Thin horizontal line
on screen

Miscellaneous

Displays smaller than 15 inches with tron-style CRTs typically
have a single horizontal grid wire about one-third of the way from
the bottom of the display image. This supporting wire, which is
thinner than a human hair, stabilizes the aperture grill against
shocks. The line is common to all tron-style displays and is not a
screen defect. It cannot be adjusted out or eliminated by repairing
or replacing display modules.

(Continued)

K

Service Source

T ak e Apart

Apple AudioVision 14 Display

Take Apart Rear Cover - 1

Rear Cover

Rear Cover

No preliminary steps are
r equired before you begin
this procedure.

1 With the monitor face-

down on a protective pad,
swivel the monitor
stand to access the two
rear cover screws.

2 Using a T-15 torx

driver, remove the
screws.

Take Apart Rear Cover - 2

Bezel

Rear Cover

Microphone

Locking Tab

Pull-Apart Tool

Locking Tab

3 Move the monitor so

that the microphone is
toward you.

4

Note:

The locking tabs
are located 1.5 inches in
from the sides of the
rear cover.

Press down on the
locking tabs. Using the
pull-apart tool, pry
apart the sides of the
rear cover.

Take Apart Rear Cover - 3

5 Lift off the rear cover.

Rear

Cover

Groove

Guide

Replacement Note:

Line
up the rear cover
grooves with the base
assembly guides and
slide on the rear cover.

Take Apart Audio Enclosure & Speakers - 4

Audio Enclosure & Speakers

Before you begin,

• Remove the rear cover

• Discharge the CRT

• Remove the anode cap

±

Warning:

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.

Audio Enclosure

This product

Take Apart Audio Enclosure & Speakers - 5

±

Tie Wrap

Degauss Panel

Ground Cable

Warning:

grounding wriststrap until
after discharging the CRT.

1 Cut the tie wrap from

the yoke and two ground
cables.

2 Disconnect the two

ground cables from the
degauss panels.

3 Disconnect the 4-pin,

4-wire CRT cable from
connector BD1.

Never use a

BD1

Ground Cable

Take Apart Audio Enclosure & Speakers - 6

Video Board Assembly

Caution:

Twisting,

4

bending, or applying
force to the video board
assembly could damage
the neck of the CRT. Be
sure to pull the video
board assembly straight
off the CRT.

Cable Tie

BP2

Pull the video board
assembly straight off the
neck of the CRT.

5 Cut the tie wrap that

connects cables BP2 and
BP3.

6 Undo the cable tie that

connects cables BP2 and
BP4.

Take Apart Audio Enclosure & Speakers - 7

Cable Tie

BP2

Video Board Assembly

7 D isconnect the degauss

cable from connector
BP2.

Take Apart Audio Enclosure & Speakers - 8

8 Using a T-15 torx

Bezel

driver, remove the four
self-threading screws
that secure the base
assembly to the bezel.

Base Assembly

Replacement Caution:

Do not overtighten the
four self-threading
screws. See Basics
section for more
information regarding
self-threading screws.

Take Apart Audio Enclosure & Speakers - 9

CRT Assembly

Caution:

assembly is connected to

The CRT

9

the base by LED and
microphone cables. Be
careful not to tear these
cables when separating
the CRT from the base
assembly.

Lift the CRT assembly off
the base and place it
face-down on a
protective workbench
pad.

Base Assembly

LED Assembly

Take Apart Audio Enclosure & Speakers - 10

10

Note:

Perform this step
if you are replacing the
speakers only.

Using a T-15 torx

Audio Enclosure

driver, remove the
eight self-threading
screws that secure the
speakers to the audio
enclosure.

11 Disconnect both speaker

cables.

12 Remove the speakers.

Speakers

Take Apart Audio Enclosure & Speakers - 11

Replacement Caution:

Do not overtighten the
self-threading screws.
See Basics section for
more information
regarding self-threading
screws.

Take Apart Audio Enclosure & Speakers - 12

13 Using a jeweler’s

Audio Board

screwdriver, release the
latches and disconnect
these cables from the

B5
B8

B3
B10

B4

audio board:

• Microphone cable

from B5

• Front panel controls

and LEDs cable from
B3

• Video cable from B4

• Video cable from B10

• Four-wire cable from

B8

14 Undo the cable tie that

connects the video cable
to the audio enclosure.

Take Apart Audio Enclosure & Speakers - 13

HP6
HP5

Main Board

Tie Wrap

BP5

BV4

15 Cut the tie wrap that

secures the cables to
connectors BP5, BV4,
HP5, and HP6.

16 Disconnect the audio

ground cables from
connectors HP5 and HP6
on the main board.

Take Apart Audio Enclosure & Speakers - 14

Audio Enclosure

Inner Guide

Base Assembly

17 Using a flat-blade

screwdriver, loosen the
two screws that secure
the base assembly to the
audio enclosure.

18 Using pliers, pull out

the two screws.

19 Slide out and remove the

audio enclosure
assembly.

Take Apart Video Cable & Strain Relief - 15

Video Cable & Strain Relief

Before you begin,

• Remove the rear cover

• Discharge CRT

• Remove the anode cap

• Remove the audio
enclosure & speakers

±

Warning:

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.

Video Cable

This product

Take Apart Video Cable & Strain Relief - 16

±

Main Board

Warning:

grounding wriststrap until
after discharging the CRT.

1 Remove the screw that

secures the video cable
to the EMI shield on the
main board.

2 Remove the video cable

from connector BV1.

Video Cable

Never use a

Take Apart Video Cable & Strain Relief - 17

Base Assembly

Strain Relief Plate

Video Cable

3 Press in the two tabs to

release the strain relief
plate from the base
assembly.

4 Lift and remove the

strain relief plate with
the attached video cables
off the base assembly.

5 Remove the video cable

from the strain relief
plate.

Replacement Note:

Be
sure to secure the video
cable onto the strain
relief plate before you
replace the strain relief
plate.

Take Apart Main Board - 18

Main Board

Before you begin,

• Remove the rear cover

• Discharge CRT

• Remove the anode cap

• Remove the audio
enclosure & speakers

• Remove the video cable

±

Main Board

Warning:

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.

This product

Take Apart Main Board - 19

±

Base Assembly

Main Board

Warning:

grounding wriststrap until
after discharging the CRT.

1 Remove the two

mounting screws that
secure the main board to
the base assembly.

Never use a

Take Apart Main Board - 20

2 Press the release latches

BV4

BP5

and disconnect the
following cables from
the main board:

• Two-pin, 2-wire on/
off switch cable from
connector BP3

• Two-pin, 2-wire on/
off switch cable from
connector BP4

• Two-pin, 2-wire
audio cable from
connector BP5

• Four-pin, 4-wire
audio cable from
connector BV4

BP3 BP4

Main Board

Take Apart Main Board - 21

3 Push out on the two rear

release latches and lift
the main board slightly.

4 Push out the two front

release latches. Lift up
and slide the main board
back to clear the
mounting tabs.

5 Remove the main board

from the assembly.

Replacement Note:

the board under the
mounting tabs before you
snap the latches into
place.

Slide

Take Apart Main Board - 22

Replacement Note:

the cutoff adjustment
whenever you replace the
main board. See “Video” in
the adjustments chapter.

Perform

Take Apart On/Off Switch Assembly - 23

On/Off Switch Assembly

Before you begin,

• Remove the rear cover

• Discharge the CRT

• Remove the anode cap

• Remove the audio
enclosure & speakers

• Remove the video cable

• Remove the main board

±

Warning:

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.

On/Off Switch Assembly

This product

Take Apart On/Off Switch Assembly - 24

±

Clip

Base

Assembly

On/Off Switch Assembly

Warning:

grounding wriststrap until
after discharging the CRT.

1 Lift the clip and remove

the on/off switch
assembly from the base
assembly.

Never use a

Take Apart Monitor Stand - 25

Monitor Stand

Before you begin,

• Remove the rear cover

• Discharge the CRT

• Remove the anode cap

• Remove the audio
enclosure & speakers

• Remove the video cable

• Remove the main board

• Remove the on/off switch
assembly

Monitor Stand

Take Apart Monitor Stand - 26

±

Latch

Monitor Stand

Latch

Base Assembly

Monitor Stand

Support

Warning:

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.

±

Warning:

grounding wriststrap until
after discharging the CRT.

1 Swivel the base

assembly to align the
monitor stand support
latches with the opening
of the base assembly.
Press down on the two
monitor stand support
latches.

This product

Never use a

Take Apart Monitor Stand - 27

Latch

Monitor Stand

Latch

Base Assembly

Monitor Stand

Support

2 Hold up the base

assembly and monitor
stand. Press down on the
two monitor stand
support latches and pull
off the monitor stand
support.

3 Turn the base assembly

and remove the monitor
stand.

Take Apart Base Assembly - 28

Base Assembly

Before you begin,

• Remove the rear cover

• Discharge the CRT

• Remove the anode cap

• Remove the audio
enclosure & speakers

• Remove the video cable

• Remove the main board

• Remove the on/off switch
assembly

• Remove the monitor stand

Base Assembly

Take Apart Base Assembly - 29

±

Warning:

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.

±

Warning:

grounding wriststrap until
after discharging the CRT.

Complete all the steps on the
previous page.

This product

Never use a

Take Apart Front Panel Controls & LEDs - 30

Front Panel Controls & LEDs

Before you begin,

• Remove the rear cover

• Discharge the CRT

• Remove the anode cap

±

Warning:

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.

Front Panel Controls & LEDs

This product

Take Apart Front Panel Controls & LEDs - 31

±

BD1

Degauss Panel

Ground Cable

Ground Cable

Warning:

grounding wriststrap until
after discharging the CRT.

1 Cut the tie wrap and

disconnect the two
ground cables from the
degauss panels and the
4-pin, 4-wire CRT
cable from connector
BD1.

Never use a

Take Apart Front Panel Controls & LEDs - 32

Video Board Assembly

Caution:

bending, or applying

Twisting,

2

force to the video board
assembly could damage
the neck of the CRT. Be
sure to pull the video
board assembly straight
off the CRT.

Remove the video board

Cable Tie

assembly from the neck
of the CRT.

3 Cut the tie wrap that

connects cables BP2 and
BP3.

4 Undo the cable tie that

connects cables BP2 and

BP2

BP4.

Take Apart Front Panel Controls & LEDs - 33

Cable Tie

BP2

Video Board Assembly

5 Disconnect the degauss

cable from connector
BP2.

Take Apart Front Panel Controls & LEDs - 34

6 Remove the four screws

Bezel

that secure the base
assembly to the bezel.

Base Assembly

Replacement Caution:

Do not overtighten the
four screws.

Take Apart Front Panel Controls & LEDs - 35

7 Carefully lower the

front of the monitor

CRT Assembly

until it lies face-down
on the workbench.

Bezel

Base Assembly

Take Apart Front Panel Controls & LEDs - 36

8 Disconnect the cable

from connector B3 on
the audio enclosure
board.

9 Using a T-10 torx

Front Panel

Controls Board

Audio
Enclosure Board

Audio Board

B3

driver, remove the two
screws that secure the
front panel controls
board to the bezel.

Take Apart Front Panel Controls & LEDs - 37

10 Remove the front panel

controls board.

Front Panel

Controls Board

Audio

Enclosure Board

Take Apart CRT Assembly - 38

CRT Assembly

Before you begin,

• Remove the rear cover

CRT Assembly

• Discharge the CRT

• Remove the anode cap

±Warning: This product

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.

±Warning: Never use a

grounding wriststrap until
after discharging the CRT.

Take Apart CRT Assembly - 39

1 Cut the tie wrap and

Degauss
Panel

Two-Wire
Connector

disconnect the two
ground cables from the
degauss panels and the
4-pin, 4-wire CRT
cable from connector
BD1.

2 Disconnect the two-

wire (black/white)

Ground
Cable

Ground Cable

BD1

cable.

Take Apart CRT Assembly - 40

Cable Tie

BP2

Video Board Assembly

3 Caution: Twisting,

bending, or applying
force to the video board
assembly could damage
the neck of the CRT. Be
sure to pull the video
board assembly straight
off the CRT.

Remove the video board
assembly from the neck
of the CRT.

4 Cut the tie wrap that

connects cables BP2 and
BP3.

5 Undo the cable tie that

connects cables BP2 and
BP4.

Take Apart CRT Assembly - 41

Cable Tie

BP2

Video Board Assembly

6 Disconnect the degauss

cable from connector
BP2.

Take Apart CRT Assembly - 42

7 Remove the four screws

Bezel

that secure the base
assembly to the bezel.

Base Assembly

Take Apart CRT Assembly - 43

8 Carefully lower the

front of the monitor

CRT Assembly

until it lies face-down
on the workbench.

Bezel

Base Assembly

Take Apart CRT Assembly - 44

Microphone Assembly Clip

Bezel

Tab

Bezel

CRT

Assembly

Degauss

Panel

9 Remove the four self-

threading bolts that
secure the degauss
panels and CRT to the
bezel.

10 Push the top degauss

panel towards the CRT
and release the
microphone assembly
clip.

11 Remove the degauss

panels.

Take Apart CRT Assembly - 45

Replacement Note:

CRT Assembly

When replacing the top
degauss panel, make sure
the microphone
assembly clip is attached
to the panel and the two
bezel tabs are inserted
into the holes.

12 Carefully lift the CRT

Washer

assembly out of the
bezel.

Replacement Note:
Replace the washers
between the CRT and the
bezel if they are damaged
or missing.

Bezel

Take Apart Microphone Assembly - 46

Microphone Assembly

Microphone
Assembly

Before you begin,

• Remove the rear cover

• Discharge the CRT

• Remove the anode cap

• Remove the CRT assembly

±Warning: This product

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.

Take Apart Microphone Assembly - 47

B5

Audio Board

±Warning: Never use a

grounding wriststrap until
after discharging the CRT.

1 Disconnect the

microphone cable from
connector B5 on the
audio board.

Take Apart Microphone Assembly - 48

2 Remove the microphone

cable from its guides
along the bezel.

Bezel

Microphone Assembly

3 Using a T-20 torx

driver, remove the two
screws that secure the
microphone assembly to
the bezel.

4 Remove the microphone

assembly.

Take Apart Microphone Assembly - 49

Bezel

Microphone Assembly

Replacement Caution:
When reattaching the
bezel to the base
assembly, be careful not
to pinch the microphone
assembly cable.

Take Apart Bezel - 50

Bezel

Bezel

Before you begin,

• Remove the rear cover

• Discharge the CRT

• Remove the anode cap

• Remove the front panel
controls & LEDs

• Remove the CRT assembly

• Remove the microphone
assembly

±Warning: This product

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.

Take Apart Bezel - 51

±Warning: Never use a

CRT

Washer

Bezel

grounding wriststrap until
after discharging the CRT.

Complete all the steps on the
previous page.

Replacement Note: Install
the four washers included
with the new bezel.

Take Apart Fuse - 52

Fuse

Before you begin,

• Remove the rear cover

• Discharge the CRT

• Remove the anode cap

±Warning: This product

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.

±Warning: Never use a

grounding wriststrap until
after discharging the CRT.

Fuse

Take Apart Fuse - 53

Using a small, long­stemmed screwdriver, pry
up one end of the fuse and
remove it from the main
board.

K

Service Source

Adjustments

Apple AudioVision 14 Display

Adjustments Geometry - 1

Geometry

Before you begin, remove
the rear cover.

±

Warning:

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.

WARNING:

High Voltage Areas

Adjustment

Controls

This product

Adjustments Geometry - 2

Note:

The controls on this
monitor require a small
hex-head plastic tool to
make adjustments. If the tool
is long, it will be too
flexible, which will make
fine adjustments difficult.
Use a short hex-head
plastic tool to minimize
flexing. Do not use metal
alignment tools—they are a
shock hazard.

Caution:

should be performed only
after a 15-minute warm-up
period.

Adjustments

Adjustments Geometry - 3

Vertical Center

1 Use Display Service

Utility to display the
All-White Screen test
pattern.

2 Using a hex-head plastic

adjustment tool, adjust
the vertical center
control until the raster
is centered (top to
bottom) in the display
area.

Vertical

Center

All-White Screen

Adjustments Geometry - 4

Horizontal Center

Using a hex-head plastic
adjustment tool, adjust the

All-White Screen

Horizontal

Center

horizontal center control
until the raster is centered
(side to side) in the display
area.

Adjustments Geometry - 5

Vertical Size

1 Using a hex-head plastic

adjustment tool, adjust

All-White Screen

Vertical

Height

the vertical height
control until the raster
height is 7 in. (± 1/8
in.) or 176 mm (± 2
mm).

2 Verify this height. If it

is off, repeat the
vertical size adjustment
and, if necessary, the
vertical center
adjustment.

Ê

Adjustments Geometry - 6

Horizontal Size

Note:

Due to video features
and timing differences

All-White Screen

Horizontal

Width

across the Apple line of
Macintosh computers, the
width of the raster/image
area on the AudioVision 14­Inch Display may vary up to
3/16 inch at each side of the
display. Perform the
horizontal size adjustment
to set the display to its
proper width.

Adjustments Geometry - 7

Using a hex-head plastic
adjustment tool, adjust the
horizontal width control
until the raster is 9 1/4 in.
(± 1/8 in.) or 235 mm (±
2 mm).

Adjustments Geometry - 8

Focus

1 Use Display Service

Utility to display the
Focus test pattern.

Focus

Focus

2 Using a hex-head plastic

adjustment tool, adjust
the focus control until
the Focus test pattern is
as clear as possible.

Adjustments Video - 9

Video

Before you begin, remove
the rear cover.

±

Warning:

contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.

Note:

Perform the cutoff
adjustment prior to
adjusting the white balance.

This product

Adjustment

Controls

WARNING:

High Voltage Areas

Adjustments Video - 10

Replacement Note:

the cutoff adjustment
whenever you replace the
CRT assembly or the main
board.

Perform

Adjustments Video - 11

Cutoff

Note:

Perform the cutoff
and white balance
adjustments after the

Gray Bars

Brightness

Contrast

monitor has been on for at
least 10 minutes.

1 Use Display Service

Utility to display the
Gray Bars test pattern.

2 Set the contrast control

to maximum contrast and
the brightness control
to a medium brightness
level.

Adjustments Video - 12

3 Using a hex-head plastic

adjustment tool, set the
red, green, and blue
background controls to
full counterclockwise

Red Background
Green Background

Blue Background

positions.

Adjustments Video - 13

Note:

To set the green and
blue drive controls to their

Sub-Contrast

Green

Drive

3/4 position, turn the
controls to their full
clockwise position and then
turn back 1/4 turn
counterclockwise.

Blue Drive

4 Set the green and blue

drive controls clockwise
to their 3/4 position.

5 Set the sub-contrast

control to its full
clockwise position.

Adjustments Video - 14

6 Using a hex-head plastic

adjustment tool, adjust
G2 until the first bar in
the test pattern is

Gray Bars

completely black and the
second bar is barely

Sub-Contrast

visible.

7 Set the sub-contrast

control to the center
position.

G2

Adjustments Video - 15

White Balance

1

Note:

Perform the
cutoff and white balance
adjustments after the
monitor has been on for
at least 10 minutes.

2 Use Display Service

Utility to display the
Gray Bars test pattern.

3 Set the contrast control

to maximum contrast and
the brightness control
to a medium brightness
level.

Brightness

Contrast

Adjustments Video - 16

4 Note the predominant

color.

5 Using a hex-head plastic

adjustment tool,

Gray Bars

alternately adjust the
red, green, and blue
background controls

Red Background

Green Background

until there is no
predominant color in
the four darkest bars.

Blue Background

Adjustments Video - 17

Note:

The darkest bar
must remain completely
black throughout the
rest of the procedure. If
you notice a predominant
color in the darkest bar,
readjust the
appropriate background
control.

Adjustments Video - 18

6 If necessary, adjust the

blue and green drive
controls until there is no

Green Drive

Gray Bars

Blue Drive

predominant color in
the four brightest bars.

Adjustments Video - 19

7 Check the four darkest

bars, and if necessary,
adjust the red, green,
and blue background

Gray Bars

controls until there is no
predominant color.

Red Background

Green Background

Blue Background