Apple Twopage Monochrome Monitor Service Manual
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Apple Two-Page Mono
Monitor
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Basics
Two-Page Monochrome Monitor
Basics Monitor Distortion - 1
Monitor Distortion
Overview
All large-screen monitors
are susceptible to
distortions caused by
environmental conditions.
Ideal Raster
These distortions are
usually not visible on
monitors with smaller
screens.
Raster Shifted Up
and Left
Raster Shifted Right
Basics Monitor Distortion - 2
Important:
set to factory specifications
may appear distorted when
set up in a new environment.
Common environmentallycaused distortions are shown
on this and the following
cards. Always check first for
environmental causes before
attempting to repair or
adjust a monitor with a
distorted raster.
Even monitors
Basics Monitor Distortion - 3
Environmental
Influences
The following environmental
conditions may distort the
raster of a Two-Page
Monochrome Monitor:
• Proximity to metal
objects, such as metal
Right Edge Not Straight
Left Side Bowed Out Right Side Bowed In
desks, file cabinets, and
bookshelves. Metal
objects affect the earth’s
magnetic field. Earth
magnetism usually
distorts only the edges of
the screen.
Basics Monitor Distortion - 4
• Fluorescent lights, other
monitors, or electronic
appliances such as coffee
makers and copy
machines. These objects
cause dynamic raster
distortion, that is,
movement or jitter of the
image.
Basics Monitor Distortion - 5
Troubleshooting
Upper-Right Corner Rounded
Left Edge S-Shaped Raster Tilted Right
Important:
swapping cannot fix a
monitor with
environmental distortion
problems, and adjusting a
monitor with such
problems alters the factory
settings.
Note:
shifted up/down or right/
left only, adjust it using the
centering controls. If you
then move the monitor, you
may need to readjust the
centering controls.
Module
If the monitor has
Basics Monitor Distortion - 6
Before adjusting a monitor
with a distorted raster, try
the following:
• Swivel or move the
monitor, or
• Remove the monitor from
the building and recheck
it in another location.
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
remove the distortioncausing object.
Basics Monitor Distortion - 7
If the display does not change
when you move the monitor
to another location,
continue troubleshooting
the problem (refer to
Troubleshooting/Symptom
Charts).
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Specifications
Apple Two-Page Monochrome
Monitor
Specifications Characteristics - 2
Characteristics
Picture Tube
Screen Resolution
Scan Rates
21-in. diagonal screen (20-in. viewable image)
Phosphor EIA Type P4 (white)
Flat, square, high-contrast, antiglare surface
1,152 x 870 lines; 77 dpi
Displays up to 16 grays with 512K of video RAM
Vertical refresh rate: 75 Hz
Horizontal scan rate: 68.7 kHz
Dot clock: 100 MHz
Specifications Characteristics - 3
Active V ideo Display Area
Input Signal
15 in. by 11.3 in.
(381 mm by 287 mm)
Video: analog; RS–343 standard
Specifications Controls - 4
Controls
User Controls
Rear panel: power switch
Right side: brightness and contrast controls
Specifications Physical and Electrical - 5
Physical and Electrical
Power Supply
Size and Weight
Monitor Stand
Universal power supply
Voltage: 90–270 VAC, self-configuring
Frequency: 47–63 Hz
Power: 95 W maximum
Height: 15.7 in. (399 mm)—add 3.2 in. (81 mm) for integrated
stand
Width: 19.5 in. (495 mm)
Depth: 17.4 in. (442 mm)
Weight: 55 lb. (25 kg)
Integrated, tilt-and-swivel stand
Specifications Operating Environment - 6
Operating Environment
Temperature
Humidity
Altitude
50°F–95°F (10°C–35°C)
90% maximum, noncondensing
10,000 ft. (3,048 m) maximum
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Troubleshooting
Apple Two-Page Monochrome
Monitor
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 Check AC power cord connections.
2 Check internal power connectors.
3 Replace blown fuse.
4 Replace power supply.
5 Replace on/off switch filter assembly.
6 Replace deflection board.
No raster, LED on 1 Adjust brightness and contrast knobs.
2 Verify that video card in computer is working properly.
3 Check power supply and deflection board connections.
4 Check CRT socket connectors.
5 Replace video board.
6 Replace deflection board.
7 Replace CRT and yoke assembly.
Troubleshooting Symptom Charts/Geometry - 3
Geometry
Raster size too short,
tall, narrow, or wide
Raster not centered 1 Verify that distortion is not due to environmental conditions.
Bad vertical linearity 1 Adjust vertical linearity control.
Bad horizontal
linearity
1 Adjust horizontal-size and vertical-size controls.
2 Replace deflection board.
3 Replace CRT and yoke assembly.
Move monitor to another location.
2 Adjust horizontal-shift and vertical-shift controls.
3 Replace video board.
2 Replace deflection board.
1 Adjust horizontal linearity control.
2 Replace deflection board.
Troubleshooting Symptom Charts/Synchronization - 4
Synchronization
Single horizontal or
vertical line appears
on screen
Picture breaks into
diagonal lines
Picture rolls
vertically
1 Check yoke connectors.
2 Check CRT socket connectors.
3 Replace deflection board.
4 Replace CRT and yoke assembly.
1 Connect another monitor to computer. Switch on monitor to
verify that computer produces video signal.
2 Check connections between video board and deflection board.
3 Replace deflection board.
4 Replace video board.
1 Verify that video card in computer is working properly.
2 Check connections between video board and deflection board.
3 Replace deflection board.
4 Replace video board.
Troubleshooting Symptom Charts/Video - 5
Video
Picture is too dark or
too bright
Contrast/brightness
unadjustable
1 Adjust contrast and brightness knobs.
2 Verify that video card in computer is working properly.
3 Check connection between contrast/brightness assembly and
video board.
4 Perform video adjustments.
5 Replace video board.
6 Replace contrast/brightness assembly.
7 Replace CRT and yoke assembly.
1 Check connection between contrast/brightness assembly and
video board.
2 Replace contrast/brightness assembly.
3 Replace video board.
4 Replace deflection board.
5 Replace CRT and yoke assembly.
Troubleshooting Symptom Charts/
(Continued)
Out of focus 1 Check CRT socket connectors.
2 Check connections between video board and deflection board.
3 Perform focus adjustment.
4 Check screen brightness with a light meter. If reading is
“10” or higher, perform the cutoff and screen luminance
adjustments.
5 Replace video board.
6 Replace deflection board.
7 Replace CRT and yoke assembly.
(Continued)
- 6
Troubleshooting Symptom Charts/Miscellaneous - 7
Miscellaneous
Picture jitters or
flashes
At a resolution of
1152x870, jitter or
a wavy image appears
on right side, left
side, or entire screen
Black spots on screen
(burnt phosphors)
1 Check all grounding cable connections.
2 Confirm that adjacent computer equipment is properly
grounded. Move electrical devices away from the monitor and
temporarily shut off all fluorescent lights.
3 Check connections between video board and deflection board.
4 Replace deflection board.
Note:
This symptom occurs with Power Macintosh 9600
computers using an Apple/IMS video card with any display set at
1152x870 screen resolution. The computer and the display are
working properly. However, video cards with serial numbers
lower than Fx705xxx should be replaced. Apple’s service stock
has been inspected and upgraded, so replacement video boards
should not exhibit this symptom.
Check the serial number on the video card. If it is lower than
Fx705xxx, replace the video card with a new one (Apple service
part number 661-1409).
Replace CRT.
Troubleshooting Symptom Charts/Monitor Stand - 8
Monitor Stand
Monitor stand does not
swivel
Monitor stand does not
tilt
1 Verify that “Front” indicator on tilt/swivel mechanism
aligns with “Front” indicator on base of monitor stand.
2 Verify that snap lock assembly on bottom of monitor stand is
in place.
1 Verify that plastic plug is in snap lock assembly.
2 Verify that snap lock assembly on bottom of monitor stand is
in place.
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T ak e Apart
Apple Two-Page Monochrome
Monitor
Take Apart Swivel Stand - 1
Swivel Stand
No preliminary steps are
required before you begin
this procedure.
Note:
Remove the tiltswivel stand before you
remove the CRT.
1 Tilt the monitor onto its
left side.
2 Slide the monitor stand
forward toward the
bezel.
Swivel Stand
Take Apart Swivel Stand - 2
3 With one hand, slightly
lift up the monitor and
rotate the base of the
stand until you can reach
the three screws that
secure the stand to the
chassis.
Take Apart Swivel Stand - 3
4 Remove the three
mounting screws.
5 Slide the monitor stand
back and remove it from
the chassis.
Take Apart Rear Cover - 4
Rear Cover
No preliminary steps are
required before you begin
this procedure.
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.
1 Remove the four cover
mounting screws.
2 Pull the rear cover off
the bezel.
Rear Cover
This product
Take Apart Access Cover - 5
Access Cover
Before you begin, remove
the rear cover.
±
Access
Cover
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious injury,
review CRT safety in
Bulletins/Safety.
1 Remove the six mounting
screws and lockwashers
that hold the access
cover in place.
2 Lift the access cover off
the chassis.
This product
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