Apple Multiple Scan 17 Display Service Manual
K
Service Source
Apple Multiple Scan 17
Display
K
Service Source
Basics
Apple Multiple Scan 17 Display
Basics EEPROM Settings - 1
EEPROM Settings
Caution:
EEPROM settings before you replace the microprocessor
board. (See next page.)
See Troubleshooting for instructions on saving the EEPROM
settings from the old microprocessor board and restoring
the settings on the new microprocessor board.
If the settings are lost before they can be written to the new
EEPROM, the display will be impossible to repair, and the
whole display will need to be replaced.
To prevent data loss or corruption, always save
Basics EEPROM Settings - 2
Microprocessor Board
K
Service Source
Specifications
Apple Multiple Scan 17 Display
Specifications Characteristics - 1
Characteristics
Picture Tube
Screen Resolution
Scan Rates
Cable Connector
17-in. diagonal Trinitron CRT (16.1-in. viewable image)
Multiple scan
Bonded glass panel with antiglare/antistatic multilayer coating
640x480, 800x600, 832x624, or 1024x768
0.26-mm stripe pitch
Vertical refresh rate: 50 to 150 Hz
Horizontal scan rate: 29 to 82 kHz
Macintosh, XGA, VGA, SVGA, and VESA compatible
15-pin miniature D-type
Specifications Characteristics - 2
Input Signals
System Requirements
Video: red, green, and blue analog signals; RS-343A
standard;.714 V peak to peak; positive going
Sync on green: RS-343A compatible level;.286 V ± 10%
negative-going during blanking intervals
Separate Sync: 1 to 5 V peak to peak; negative or positive going
Composite Sync: 1 to 5 V peak to peak; negative or positive going
Power Macintosh, Macintosh Centris, Macintosh Quadra, or any
NuBus compatible Macintosh with a Macintosh Display Card
24AC.
Macintosh II family, PowerBooks, Duo and Mini Dock, Macintosh
Performa, Macintosh LC, LC II, LC III, and Macintosh
computers with Display Cards 4•8, 8•24, 8•24GC work in
640x480 mode. Other modes possible with additional adapters.
System software version 7.1 or later
Specifications Controls and Ports - 3
Controls and Ports
User Controls
I/O Ports
Front panel: power, reset, and control buttons; brightness and
contrast controls
Additional controls available using the command button: horizontal
and vertical shift, horizontal and vertical size, rotation,
horizontal and vertical convergence, and color temperature
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)
Two Apple Desktop Bus (ADB) ports and one ADB pass-through
port
Microphone: One input and one pass-through port
Headphone/Speaker: One input and one pass-through port
Specifications Physical and Electrical - 4
Physical and Electrical
Power Supply
Size and Weight
Universal power supply
Voltage: 90–132 and 198–260 VAC, self-configuring
Frequency: 47–63 Hz
Power: 150 W maximum
Height: 16.5 in. (424 mm)
Width: 15.8 in. (405 mm)
Depth: 17.6 in. (452.3 mm)
Weight: 50.0 lb. (22.5 kg)
Specifications Physical and Electrical - 5
Monitor Stand
Built-in, tilt-and-swivel stand
Three ADB ports (two ADB ports are in the front of the stand and
one ADB port is at the rear of the stand)
Sound-in and sound-out ports (to the CPU) at the rear of the base
Microphone input and speaker/headphone output ports at the front
of the base
Specifications Environmental - 6
Environmental
Temperature
Altitude
Humidity
Power Savings Feature
Operating: 50°F–104°F (10°C–40°C)
Storage: 32°F –140°F (0°C–60°C)
Shipping: -4°F–140°F (-40°C–60°C)
Operating: to 10,000 ft. (1,067 m)
Shipping: to 35,000 ft. (3,048 m)
Operating: 20–80% maximum, noncondensing
Storage: 5–90% maximum, noncondensing
Shipping: 5–95% maximum, noncondensing
Conforms to the Energy Star Program of the United States
Environmental Protection Agency
K
Service Source
Troubleshooting
Apple Multiple Scan 17 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 First Checklist - 2
First Checklist
Important:
returned for repair are found to be fully operational. Read this
checklist before you return a module. Prevent needless module
replacement and unnecessary time delays.
54% of the Apple Multiple Scan 17 Display modules
The Apple Multiple Scan 17 Display is not
fully compatible with all Macintosh
computers and PowerBooks.
If you suspect a loss of functionality, especially with the number
of screen resolutions available (in Control Panels), check the
Tech Info Library or contact Apple Technical Support.
Troubleshooting First Checklist - 3
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 (desks, file cabinets, etc.).
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.
Move the unit to another room or building to help determine if
external interference is the source of the problem.
Troubleshooting First Checklist - 4
A misadjusted screen can mimic the
symptoms of 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 replacements 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 Display Setting Restoration/Connect the Hardware - 5
Display Setting Restoration
Each Multiple Scan 17 Display has an EEPROM (located on the
microprocessor controller board) that contains adjustment
information specific to that monitor. Before you replace the
microprocessor board, save this EEPROM information.
Use MacTest Pro Display Setting Restore Utility to preserve the
monitor adjustment settings.
Connect the Hardware
There are two ways to connect the hardware to use the MacTest Pro
Display Setting Restore Utility:
1 Connect a serial cable (MINI DIN-8) between the
malfunctioning display and a separate computer running
MacTest Pro. Use either the modem port or the printer port
on the computer. (If you use the printer port, AppleTalk
Troubleshooting Display Setting Restoration/Connect the Hardware - 6
must be turned off). Also connect a power cable to the display.
Advantage:
or quit MacTest Pro to complete the repair.
You do not have to shut down the host computer
Disadvantage:
computer (with display).
2 Connect the display as usual, using a video cable and power
cable. Also, connect a serial cable (MINI DIN-8) between the
display and either the modem or printer port on the
computer.
Advantage:
display under repair is the only display required.
Disadvantage:
needs to be replaced, the display may not be working well
enough to view this utility in MacTest Pro.
This method requires a separate host
This method lends itself to on-site repair; the
Since the microprocessor board on the display
Troubleshooting Display Setting Restoration/Save the EEPROM Information - 7
Another disadvantage is that after creating the data file from
the old EEPROM, you must quit MacTest Pro and shut down
the computer to install the new EEPROM.
Save the EEPROM Information
To save information from the old EEPROM, create a data file:
1 Start MacTest Pro.
2 Choose “Apple Multiple Scan 17 Display.”
3 Select “Test.”
4 Click “Create File.”
Install the Microprocessor Board
See Take Apart for instructions on installing the new
microprocessor board.
Troubleshooting Display Setting Restoration/Restore the EEPROM Information -
After the new microprocessor board is installed, the new EEPROM
will have default settings that allow you to read the display, but
with difficulty. When the settings from the old EEPROM are
transferred to the new EEPROM, the display should be clear and
the last color temperature mode chosen restored.
Restore the EEPROM Information
To download the saved adjustment information to the new EEPROM,
1 Start MacTest Pro.
2 Choose “Apple Multiple Scan 17 Display.”
3 Select “Test.”
4 Click “Write File.”
Troubleshooting Display Setting Restoration - 9
Caution:
important information about the EEPROM data file. If data is lost
or corrupted, you will have to return the display to Apple for
repair.
• Make sure that the data in the saved file is written back to the
display used to create the file. Each display is unique, so
writing the wrong data to a display may cause severe
adjustment problems.
• Make sure that the data file is deleted after writing the data
back to the display. This erasure ensures that data from one
display is not accidentally written to another.
• Do not delete the new data file before it’s written to the new
EEPROM. If the file is lost before the data can be written to the
new EEPROM, the repair will be impossible to complete and the
whole display will need to be returned.
Make certain that you are aware of the following
Troubleshooting CRT - 10
CRT
If the monitor shuts down shortly after powering up, follow this
procedure to determine if the CRT is defective:
1 Refer to Take Apart to remove the monitor stand, remove the
rear cover, discharge the CRT, remove the EMI shield.
2 With the power off, insert a nonconductive shield (such as a
strip of plastic or cardboard) between the CRT/video board
and the main deflection board to shield both boards from
potential shorts.
3
Note:
Twisting, bending, or applying force to the CRT/video
board could damage the neck of the CRT. Be sure to pull the
CRT/video board straight off the CRT.
Loosen the mounting screw on the neck clamp.
4 Without disconnecting any cables, pull the CRT/video board
straight off the neck of the CRT (about 3/4 inch) until the
board disconnects from the pins.
Troubleshooting CRT - 11
5 Rest the CRT/video board on the nonconductive shield.
6 Connect the monitor to a computer.
7 Plug in the power cable and turn on the monitor.
• If the power indicator light stays on, the CRT is defective.
• If the monitor shuts down immediately or after a few
seconds, replace the main deflection board.
Troubleshooting Symptom Charts/Raster - 12
Symptom Charts
Raster
No raster; power
indicator light on
Raster edges have
color blotches when
displaying an allwhite screen
1 Ensure monitor’s video cable is properly connected to
computer or video card in the computer.
2 Replace main deflection board.
1 Degauss monitor with an external degaussing coil.
2 Move monitor to different location and repeat degaussing
procedure.
Note:
This symptom is caused by strong magnetic fields in the
environment. Exchanging boards will not cure the symptom. Refer
to “First Checklist” in this chapter.
Troubleshooting Symptom Charts/Raster
(Continued)
- 13
Oversized raster;
menu bar might be
partially cut off;
adjustments have no
effect on raster
Raster
Replace main deflection board, and without disconnecting
microprocessor board, check its revision level.
Important:
mark on the upper left corner and a 9-digit number that ends in
-11, -12, or -13.
If you see “-12” and a white mark or “-13” and no white
mark, you have an updated board. No board replacement required.
If you see “-11” or “-12” and no white mark, replace the
microprocessor board with an updated board after downloading
settings as described in “Display Setting Restoration” in this
chapter.
Caution:
EEPROM settings before you replace the microprocessor board.
(Continued)
On the component side of the board, look for a white
To prevent data loss or corruption, always save
Troubleshooting Symptom Charts/Power - 14
Power
No power; power
indicator light off
Monitor shuts down 1 Ensure monitor’s video cable is properly connected to
1 Check that power cord is properly connected to monitor and
live power source.
2 Ensure monitor’s video cable is properly connected to
computer or video card in the computer.
3 Replace main deflection board.
computer or video card in the computer.
2 Determine if CRT is the cause by following the “CRT”
procedure in this chapter.
3 If CRT is not the cause, replace main deflection board.
4 Replace CRT/video board.
Troubleshooting Symptom Charts/Indicator Lights - 15
Indicator Lights
Convergence
indicator light blinks
or stays on; power
indicator light might
also blink
Replace microprocessor board after downloading settings as
described in “Display Setting Restoration” in this chapter.
Caution:
EEPROM settings before you replace the microprocessor board.
To prevent data loss or corruption, always save
Troubleshooting Symptom Charts/Indicator Lights
(Continued)
- 16
Rotation indicator
light blinks or stays
on; power indicator
light might also blink
Indicator Lights
Replace main deflection board.
(Continued)
Troubleshooting Symptom Charts/Indicator Lights
(Continued)
- 17
Size indicator light
blinks or stays on;
power indicator light
might also blink
Indicator Lights
1 Replace main deflection board.
2 Replace CRT/video board.
3 Replace microprocessor board after downloading settings as
described in “Display Setting Restoration” in this chapter.
Caution:
EEPROM settings before you replace the microprocessor
board.
To prevent data loss or corruption, always save
(Continued)
Troubleshooting Symptom Charts/Indicator Lights
(Continued)
- 18
Centering indicator
light blinks or stays
on; power indicator
light might also blink
Indicator Lights
1 Replace main deflection board.
2 Replace microprocessor board after downloading settings as
described in “Display Setting Restoration” in this chapter.
Caution:
EEPROM settings before you replace the microprocessor
board.
To prevent data loss or corruption, always save
(Continued)
Loading...