Apple Multiple Scan 15av Display Service Manual

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Apple Multiple Scan 15 AV

Display

Service Source

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Basics

Apple Multiple Scan 15AV

Display

Basics Overview - 1

Overview

The Apple Multiple Scan

15AV Display is a 15-inch

(13.75-inch viewable

image size) color monitor

that supports a variety of

resolutions and that features

a built-in amplifier and

front-facing stereo

speakers.

Basics Overview - 2

Monitor Features

Features of the Apple Multiple Scan 15AV Display include

the following:

• Antistatic, antiglare screen surface

• Multiple screen resolutions ranging from 640x480 to

1024x768

• Front-facing, CD-quality speakers

• Easy-access front headphone jack

• Support for Mac OS and Windows 95

• Compatible with Apple ColorSync software for the

closest possible color match between what is seen on the

monitor and what is printed or scanned

Basics Repair Issues - 3

Repair Issues

The current configuration of the CRT/video board and the CRT ground strap differs from

the original configuration. The differences affect the CRT/video board removal procedure

in the Take Apart chapter, but they do not affect the performance of the display.

Note the differences in the following table:

Note:

Apple part number 076-0757 is a kit that includes the new configuration of the

CRT/video board and a matching CRT ground strap with the lug-type connector. If your

display already has a CRT ground strap with the lug-type connector, you do not need to

replace the CRT ground strap. Otherwise, refer to “CRT Ground Strap” in the Take Apart

chapter in this manual for replacement instructions.

Part Original Configuration Newer Configuration

CRT/Video Board Two prongs on CRT/video

board shield for connection to

two-wire connector from

CRT ground strap

Clip on CRT/video board shield

for connection to spade lug-

type connector from CRT

ground strap

CRT Ground Strap

connection to

CRT/Video Board

Two-wire connector at end of

two twisted wires from CRT

ground strap

Spade lug-type connector at

end of single braided cable

from CRT ground strap

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Specifications

Apple Multiple Scan 15AV

Display

Specifications Characteristics - 1

Characteristics

Picture Tube

15-in. CRT (13.75-in. diagonal viewable image size)

Raster Size: 10.6 in. x 7.9 in. (270 mm x 200 mm)

Multiple scan

Antistatic, antiglare surface treatment

Dot Pitch: 0.28 mm

White Point: 9300° K

Shipping Brightness: 25 foot Lamberts (± 5 fL)

Phosphor

Aluminized P22 (red, green, blue)

Phosphor CIE Coordinates:

Red x = 0.610 ± 0.020 y = 0.342 ± 0.020

Green x = 0.298 ± 0.020 y = 0.588 ± 0.020

Blue x = 0.151 ± 0.015 y = 0.064 ± 0.015

Specifications Characteristics - 2

Screen Resolution

Macintosh

640x480 at 60 Hz in VGA mode

640x480 at 67 Hz in Macintosh mode

800x600 at 60 Hz in SVGA mode

800x600 at 72 Hz in SVGA mode

832x624 at 75 Hz in Macintosh mode

1024x768 at 60 Hz in Macintosh mode

1024x768 at 70 Hz in Macintosh mode

1024x768 at 75 Hz in Macintosh mode

PC-Compatibles

640x480 at 60 Hz in VGA mode

800x600 at 60 Hz in SVGA mode

800x600 at 72 Hz in SVGA mode

1024x768 at 60 Hz in SVGA mode

1024x768 at 70 Hz in SVGA mode

1024x768 at 75 Hz in SVGA mode

Specifications Characteristics - 3

Cable Connector

15-pin miniature D-type

Input Signals

Red, green, and blue signals; separate sync

Audio

Response: 50 Hz to 20,000 Hz

Output: 2 W

SPL: 82 db @ 1 kHz, 1 meter

Specifications Characteristics - 4

System

Requirements

Power Macintosh, Macintosh Centris, Macintosh Quadra, some

Macintosh Performas, or any NuBus compatible Macintosh

with a Macintosh Display Card 24AC.

Macintosh II family, PowerBooks, Duo and Mini Dock, some

Macintosh Performa, Macintosh LC, LC II, LC III, and

Macintosh computers with Display Cards 4•8, 8•24, or

8•24GC installed work in 640x480 mode. Other modes

possible with additional adapters.

System software version 7.1 or later

Specifications Characteristics - 5

Monitor Timings

640x480

Resolution @ 60 Hz

640x480

Resolution @ 67 Hz

Horizontal Timing Horizontal Timing

Back Porch: 48 dots Back Porch: 96 dots

H SYNC: 96 dots H SYNC: 64 dots

Front Porch: 16 dots Front Porch: 64 dots

1 dot: 39.72 ns 1 dot: 33.06878 ns

1 H: 31.77

µ

s 1 H: 28.5714

µ

s

1/dot: 25.175 MHz 1/dot: 30.24 MHz

Vertical Timing Vertical Timing

Back Porch: 33 H Back Porch: 39 H

V SYNC: 2 H V SYNC: 3 H

Front Porch: 10 H Front Porch: 3 H

1/H: 31.5 kHz 1/H: 35.0 kHz

1 V: 16.67 ms 1 V: 15.0 ms

Specifications Characteristics - 6

Monitor Timings

800x600

Resolution @ 60 Hz

800x600

Resolution @ 72 Hz

Horizontal Timing Horizontal Timing

Back Porch: 88 dots Back Porch: 64 dots

H SYNC: 128 dots H SYNC: 120 dots

Front Porch: 40 dots Front Porch: 56 dots

1 dot: 25.0 ns 1 dot: 20.0 ns

1 H: 26.4

µ

s 1 H: 20.800

µ

s

1/dot: 40.0 MHz 1/dot: 50.0 MHz

Vertical Timing Vertical Timing

Back Porch: 23 H Back Porch: 23 H

V SYNC: 4 H V SYNC: 6 H

Front Porch: 1 H Front Porch: 37 H

1 H: 37.879

µ

s 1/H: 48.077 kHz

1/H: 16.58 kHz 1 V: 13.853 ms

1 V: 16.58 ms

Specifications Characteristics - 7

Monitor Timings

832x624

Resolution @ 75 Hz

1024x768

Resolution @ 75 Hz

Horizontal Timing Horizontal Timing

1/H: 49.7 kHz Back Porch: 160 dots

Back Porch: 224 dots H SYNC: 136 dots

H SYNC: 64 dots Front Porch: 24 dots

Front Porch: 32 dots 1 dot: 15.385 ns

1 H: 20.1

µ

s 1 H: 20.677

µ

s

1/dot: 57.28 MHz 1/dot: 65.0 MHz

Vertical Timing Vertical Timing

Back Porch: 38 H Back Porch: 29 H

V SYNC: 3 H V SYNC: 6 H

Front Porch: 2 H Front Porch: 3 H

1 V: 13.41 ms 1/H: 48.363 kHz

1 V: 16.667 ms

Specifications Controls and Ports - 8

Controls and Ports

User Controls

Front Panel: power, select, up, down, recall, brightness,

contrast, sound volume

Additional picture controls available using the select button:

horizontal and vertical shift, horizontal and vertical size

Automatic degauss at power-on; manual degauss by turning power

switch off, then on (capable of full degauss after monitor is

turned off for 20 minutes or more)

I/O Ports

Headphone/Speaker: one input port and one pass-through output

port

Specifications Physical and Electrical - 9

Physical and Electrical

Power Supply

Voltage: 100–240 VAC

Frequency: 50–60 Hz

Power: 75 W maximum; 8 W sleep mode

Input Frequency

Range

Horizontal: 30 kHz to 60.2 kHz

Vertical: 56 Hz to 75 Hz

Size and Weight

Height: 14.93 in. (383 mm ± 5 mm)

Width: 17.3 in. (443 mm ± 5 mm)

Depth: 15.4 in. (395 mm ± 5 mm)

Weight: 31 lb. (14 kg)

Monitor Stand

Removable tilt-and-swivel stand

Specifications Environmental - 10

Environmental

Temperature

Operating: 50°F to 104°F (10°C to 40°C)

Shipping: –4°F to +151°F (–40°C to +65°C)

Storage: 32°F to 140°F (0°C to 60°C)

Humidity

20% to 95% (noncondensing) over the range of 77°F to 104°F

(25°C to 40°C)

Altitude

Operating: 0 to 10,000 ft. (0 to 3,048 m)

Transit: 0 to 15,000 ft. (0 to 4,500 m)

Power Saving

Feature

Conforms to the Energy Star Program of the United States

Environmental Protection Agency

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Troubleshooting

Apple Multiple Scan 15AV

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.)

For additional assistance, contact Apple Technical Support.

Troubleshooting First Checklist/ - 2

First Checklist

Important:

Many Apple Multiple Scan 15AV display modules

returned for repair are found to be fully operational. Read this

checklist before you return a module, and prevent needless module

replacement and unnecessary time delays.

The Apple Multiple Scan 15AV Display is not

compatible with all computers.

This display works with both Macintosh and IBM PC-compatible

computers. A video card may need to be installed to use this display

with some computers. For more information, see the computer

manual.

For more information on what computers or video cards are

compatible with the display, see the Specifications chapter.

The CRT raster will not always resemble a perfect

rectangle.

CRT tolerances allow for some distortion. Additional distortion can

be caused by magnetized metal objects (such as desks or file

cabinets). Move the unit to a different location if you notice raster

bowing or bent raster edges.

Jitter, faint lines, or screen movement can be caused

by external interference such as electronic devices

and fluorescent lights

.

Fluorescent lights, other monitors, or electronic appliances

(such as coffee makers and copy machines) can cause raster

distortion. Move the unit to another room or building to help

determine if external interference is the source of the problem.

Note:

If the raster has shifted up/down or right/left only, adjust

it using the user controls. However, keep in mind that, if you then

move the monitor, you may need to readjust the centering

controls.

If the display changes (for better or worse) when you move it to

another location, the environment is the source of the problem.

Relocate the monitor or move the distortion-causing object.

Troubleshooting First Checklist - 3

A maladjusted screen can mimic the symptoms of

main deflection board or CRT failures.

By performing the adjustment procedures, you might determine if

one or more of the adjustments is the cause of the problem.

CRTs rarely fail.

Needless CRT replacement can be prevented by checking display

adjustments, checking the possibility of other defective modules,

and accepting small imperfections in screen display.

If you have any doubts about whether a CRT is defective, contact

Apple Technical Support.

Troubleshooting Symptom Charts/No Raster - 4

Symptom Charts

No Raster

No raster (screen is

black); power

indicator light on

1 Ensure that the display is connected to a known-good video

source.

2 Adjust the front panel brightness and contrast controls.

3 Check the monitor’s video cable for breakage or damage.

Perform a continuity check to ensure that the video cable is

not at fault.

4 Slowly adjust the screen control on the flyback transformer

to see if the raster appears. If it reappears, perform the

“Cutoff and White Balance” procedure in the Adjustments

chapter.

5 Replace the main deflection board.

No raster; power

indicator light off

1 Ensure that the display is plugged in and that the power cord

is not damaged.

2 Replace the main deflection board.

Video

Display has one

predominant color

1 Verify that the CRT/video board is connected securely to the

CRT socket.

2 Inspect the video cable connector (at P301) on the CRT/

video board for breakage/continuity. This cable carries the

Red, Green, and Blue signals from the main deflection board

to the CRT/video board.

3 Perform the “Cutoff and White Balance” procedure in the

Adjustments chapter.

4 Replace the CRT/video board.

5 If you suspect a defective CRT, contact Apple Technical

Support.

P301

Troubleshooting Symptom Charts/Video

(Continued)

- 5

Video

(Continued)

Areas of the screen

have blotches of color

1 Since this type of problem (purity) is often caused by

magnetic fields in the area, place unit in another location to

see if symptom disappears, changes in its intensity, or

changes location on the screen.

2 Turn off the monitor power switch, wait five minutes, then

turn it back on. This enables the monitor’s internal

degaussing coil.

3 Severe magnetic field problems require the use of an

external degaussing coil. (Degaussing coils can be purchased

at most larger electronic parts stores.)

Screen is too bright;

adjusting Brightness

control does not

lower intensity

1 Perform the “Cutoff and White Balance” procedure in the

Adjustments chapter.

2 Replace the CRT/video board.

3 Replace the main deflection board.

4 If you suspect a defective CRT, contact Apple Technical

Support.

Troubleshooting Symptom Charts/Geometry - 6

Geometry

Raster not centered 1 Adjust either or both horizontal center and vertical center

controls. See “Geometry” in the Adjustments chapter.

2 Adjust the horizontal center switch (SW701 on version G

only). See “Horizontal Centering” in the Adjustments

chapter.

Size of the horizontal

and/or vertical

raster is incorrect

Use the appropriate size controls to set the vertical height to 200

mm (7.9 inches) and the horizontal width to 270 mm (10.6

inches). Refer to “Geometry” in the Adjustments chapter.

One or both sides of

the raster is bowed

1 To minimize the bowing, perform the “Pincushion”

procedure in the Geometry section of the Adjustments

chapter. Keep in mind that there is some allowed tolerance

and the setting will NOT always be perfect.

2

Important:

As mentioned in step one, some degree of bowing

is still considered to be within tolerance. If you have any

doubts, contact Apple Technical Support before replacing a

board that may not fix the problem.

3 Replace the main deflection board.

Raster is narrower or

wider at the top of the

screen than at the

bottom

1 To set the keystone control for optimum screen performance,

perform the “Keystone” procedure in the Geometry section

of the Adjustments chapter. Keep in mind that there is some

allowed tolerance and the setting will NOT always be perfect.

2

Important:

As mentioned in step one, some trapezoidal

imperfection is still considered to be within tolerance. If you

have any doubts, contact Apple Technical Support before

replacing a board that may not fix the problem.

3 Replace the main deflection board.

Troubleshooting Symptom Charts/Sound Problems - 7

Sound Problems

Distorted or no sound

coming through one

speaker

Disconnect the wires to both speakers. Using jumper cables,

connect the right speaker wire to the left speaker and the left

speaker wire to the right speaker. This will isolate the problem to

a defective speaker or a defective main deflection board.

Distorted or no sound

in both speakers

1 Try another sound source to ensure that you are not using a

defective CD or other sound device.

2 Replace the main deflection board.

On a Performa 6400,

sound comes through

Performa subwoofer

even though

headphones are

plugged into

headphone jack on

front of display

To mute the subwoofer, do any one of the following:

• Keep headphones plugged into headphone jack on front of

display, but mute subwoofer using Sound and Displays

Control Panel.

• Keep headphones plugged into headphone jack on front of

display, but lower volume of subwoofer by turning balance

control knob at rear of Performa 6400 fully

counterclockwise.

• Plug headphones into headphone jack on front of Performa

6400.

• Plug headphones into headphone jack at rear of Performa

6400.

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T ak e Apart

Apple Multiple Scan 15AV

Display

Take Apart Safety Guidelines for Taking Apart the Apple Multiple Scan 15AV

Safety Guidelines for Taking Apart the

Apple Multiple Scan 15AV Display

±

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 and setting up an ongoing ground

connection.

Important:

Whenever the housing of the monitor is removed

and before replacing a module, you must

1 Discharge the CRT and remove the anode cap.

2 Establish an ongoing ground by using a cable with

alligator clips at both ends. Connect one end to the anode

aperture, and connect the other end to the braided ground

strap that wraps around the CRT.

3 With the CRT discharged and the ongoing ground in place,

wear a grounding wriststrap to prevent equipment

damage from static electricity.

Anode Cap

CRT Discharge Tool

Ongoing GroundAnode Aperture

Ground Strap

Note:

The ground strap

and CRT/video board on

newer displays are

somewhat different than

pictured here. Refer to

“Repair Issues” in the

Basics chapter for details.

Take Apart Control Panel Door - 2

Control Panel

Door

No preliminary steps are

required before you begin

this procedure.

Control Panel Door

Take Apart Control Panel Door - 3

1 Position the monitor

close to the edge of a

table and so that the

screen faces you.

2 Press down on the center

of the door so it flips

open.

Take Apart Control Panel Door - 4

3 Grasp each side of the

door and pull the door

down to release it from

its hinges.

Replacement Note:

Position

the door under the bezel so

the hinges line up with the

bezel contacts. Push the door

onto the bezel until it snaps

into place.

Control Panel Door

Take Apart Tilt-Swivel Stand - 5

Tilt-Swivel Stand

Before you begin, remove

the control panel door.

Note:

Because this

procedure requires you to

place the monitor face

down, you need to remove

the control panel door to

prevent damaging it.

Tilt-Swivel

Stand