Apple macintosh tv Service Manual
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Macintosh TV
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Basics
Macintosh TV
Basics Overview - 1
Overview
This manual contains
complete repair procedures
for the Macintosh TV shown
at left.
Figure: Macintosh TV
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Specifications
Macintosh TV
Specifications Processor - 1
Processor
CPU
Motorola 68030 microprocessor
32 MHz
Built-in memory management unit (MMU)
Coprocessor
Socket for optional math coprocessor
Specifications Memory - 2
Memory
RAM
ROM
PRAM
VRAM
4 MB of dynamic RAM on board
Expandable to 8 MB (100 ns or faster SIMMs)
72-pin DRAM SIMM connector
1 MB of ROM, expandable to 2 MB
256 bytes of clock/calendar/parameter memory
Long-life lithium battery
512K of VRAM on board (displays up to 256 colors or 8-bit
color)
Specifications Disk Storage - 3
Disk Storage
Floppy Drive
Hard Drive
CD-ROM Drive
Internal 1.4 MB Apple SuperDrive
3.5-inch, internal 160 MB SCSI hard drive
Internal AppleCD 300i, double-speed CD-ROM drive
Specifications I/O Interfaces - 4
I/O Interfaces
Serial
SCSI
Apple Desktop Bus
Two RS-232/RS-422 serial ports; mini DIN-8 connectors
One SCSI parallel port; DB-25 connector
Connects up to six external SCSI devices
Two Apple Desktop Bus (ADB) ports; mini DIN-4 connectors
Maximum of three ADB devices recommended
Maximum current draw: 500 mA
(Mouse draws 10 mA, keyboard draws 25 mA)
Specifications I/O Interfaces - 5
Infrared Receiver
Sound
For remote control
Sound-output port capable of delivering stereo sound
Sound-input port for monaural sound input
Front headphone jack capable of delivering stereo sound
Specifications I/O Devices - 6
I/O Devices
Keyboard
Mouse
Speaker
Supports all Apple Desktop Bus keyboards
Apple Desktop Bus Mouse II
New, ergonomic design
Adjustable sound control on front of bezel
Specifications Sound and Video - 7
Sound and Video
Sound Generator
Video Display
Records at 11 kHz or 22 kHz sample rate
Plays back at 11 kHz or 22 kHz sample rate
Two speakers with enhanced stereo sound
Allows playback and recording of ordinary audio compact discs
14-in. diagonal, 13-in. viewable screen
Trinitron CRT with high-contrast glass
.26-mm aperture grille pitch
640 pixels by 480 lines; 70 dpi
Specifications Electrical - 8
Electrical
Line V oltage
Frequency
Maximum Power
100–240 VAC; Universal power supply
47–63 Hz, single phase
120 W
Specifications Physical - 9
Physical
Dimensions
Weight
Height: 17.9 in. (45.5 cm)
Width: 13.5 in. (34.4 cm)
Depth: 16.5 in. (42.0 cm)
41.5 lb. (18.9 kg)
Specifications Environmental - 10
Environmental
Operating Temperature
Storage Temperature
Relative Humidity
Altitude
50–104°F (10–40°C)
–30 to 116°F (–30 to 47°C)
20–95% noncondensing
10,000 ft. (3048 m) maximum (operating)
15,000 ft. (4572 m) maximum (non-operating)
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Troubleshooting
Macintosh TV
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/Video - 2
Symptom Charts
Video
Screen is black, too
dark, or too bright;
audio and drive
operate
Out of convergence
(color bleeds from
text or lines)
1 Adjust contrast button on front bezel.
2 Adjust brightness. Use Brightness Control Panel.
3 Reset PRAM.
4 Check yoke cable connection.
5 Perform video adjustments. Refer to “Video” in Adjustments
chapter.
6 Replace analog board.
7 Replace CRT.
1 Perform convergence adjustment. Refer to “Convergence” in
Adjustments chapter.
2 Replace analog board.
3 Replace CRT.
Troubleshooting Symptom Charts/Video
(Continued)
- 3
Single vertical or
horizontal line is
displayed
Predominant color
tint or color cannot be
adjusted
Video
Note:
bottom third of a lit screen. This line is inherent in the design of
Trinitron monitors. Do not replace modules.
Otherwise,
1 Replace analog board.
2 Replace CRT.
1 Perform video adjustments. Refer to “Video” in Adjustments
2 Replace analog board.
3 Replace CRT if red, green, or blue cannot be turned off using
(Continued)
A thin, gray, horizontal line may be visible across the
chapter.
appropriate controls.
Troubleshooting Symptom Charts/Video
(Continued)
- 4
Screen is bright and
audio is present, but
no video information
is visible
Picture breaks into
diagonal lines, or
picture rolls
vertically or
horizontally
Black screen spots
(burnt phosphors)
Video
1 Perform video adjustments. Refer to “Video” in Adjustments
2 Replace analog board.
3 Replace chassis harness cable.
4 Replace CRT.
1 Perform video adjustments. Refer to “Video” in Adjustments
2 Replace analog board.
Replace CRT.
(Continued)
chapter.
chapter.
Troubleshooting Symptom Charts/Video
(Continued)
- 5
Video
Screen jitters or
flashes
Out of focus 1 Perform focus adjustment. Refer to “Focus” in Adjustments
1 Verify that adjacent computer equipment is properly
2 Check that all ground cables are secure.
3 Disconnect floppy drive, CD-ROM drive and hard drive.
4 Replace analog board.
2 Replace analog board.
3 Replace CRT only if one part of display remains out of focus
(Continued)
grounded. Move electrical devices away from monitor.
Temporarily shut off all fluorescent lights in area.
chapter.
despite adjustment of focus controls to their limits.
Troubleshooting Symptom Charts/Video
(Continued)
- 6
Flashing or wavy
screen, or monitor
emits high-pitched
noise
Raster size too short/
tall or narrow/wide
Linearity bad (size of
text/graphics differs
at top, bottom, or
sides of screen)
Video
Replace analog board.
1 Adjust horizontal or vertical size control. Refer to
2 Replace analog board.
1 Perform video adjustments. Refer to “Video” in the
2 Replace analog board.
(Continued)
Adjustments chapter.
Adjustments chapter.
Troubleshooting Symptom Charts/Video
(Continued)
- 7
Raster tilted or
shifted
Raster distorted
(barrel-shaped,
corners not square,
stretched or
compressed at top of
display, or sides not
perpendicular)
Video
1 Verify that adjacent computer equipment is properly
2 Perform appropriate geometric adjustments (see
3 Perform yoke adjustment. Refer to “Yoke” in Adjustments
4 Replace analog board.
1 Verify that adjacent computer equipment is properly
2 Perform appropriate geometric adjustments (see
3 Replace analog board.
4 Replace CRT (only in rare instances).
(Continued)
grounded. Move electrical devices away from monitor.
Temporarily shut off all fluorescent lights in area.
Adjustments chapter).
chapter.
grounded. Move electrical devices away from monitor.
Temporarily shut off all fluorescent lights in area.
Adjustments chapter).
Troubleshooting Symptom Charts/Video
(Continued)
- 8
Video
Raster not centered 1 Verify that adjacent computer equipment is properly
2 Adjust horizontal or vertical center control. Refer to
3 Replace analog board.
(Continued)
grounded. Move electrical devices away from monitor.
Temporarily shut off all fluorescent lights in area.
Adjustments chapter.
Troubleshooting Symptom Charts/Floppy Drive - 9
Floppy Drive
Audio and video are
present, but internal
floppy drive does not
operate
Disk ejects; display
shows icon with
blinking “X”
Unable to insert disk
all the way
1 Replace bad disk with known-good disk.
2 Replace floppy drive.
3 Replace logic board. Retain customer’s SIMMs.
4 Replace chassis harness cable.
1 Replace bad system disk with known-good system disk.
2 Replace floppy drive.
3 Replace logic board. Retain customer’s SIMMs.
4 Replace chassis harness cable.
1 To eject previously inserted disk, insert opened paper clip
into hole beside floppy drive.
2 Switch off system and hold mouse button down while
switching system on (to complete eject cycle).
3 Remove front drive bezel.
4 Replace floppy drive.
Troubleshooting Symptom Charts/Floppy Drive
(Continued)
- 10
Floppy Drive
Does not eject disk 1 Insert opened paper clip into hole beside floppy drive.
2 Switch off system and hold mouse button down while
switching system on (to complete eject cycle).
3 Remove front drive bezel.
4 Replace floppy drive.
Internal floppy drive
runs continuously
1 Replace bad disk with known-good disk.
2 Replace floppy drive.
3 Replace logic board. Retain customer’s SIMMs.
(Continued)
Troubleshooting Symptom Charts/Hard Drive - 11
Hard Drive
Internal or external
hard drive does not
operate
Works with internal
or external SCSI
device but does not
work with both
1 Verify that SCSI loopback card is not attached.
2 Verify that external drive is properly terminated.
3 Replace hard drive.
4 Replace logic board. Retain customer’s SIMMs.
1 Verify that SCSI device ID switch setting on external device
is higher than 0. Also verify that ID switch setting on
external SCSI device does not duplicate ID switch settings on
any other attached external SCSI devices.
2 Replace terminator on external SCSI device.
3 Replace SCSI select cable.
Troubleshooting Symptom Charts/CD-ROM Drive - 12
CD-ROM Drive
CD-ROM drive does
not accept disc
Volume control does
not operate correctly
Macintosh cannot
mount CD-ROM drive
1 Replace disc (if dirty or damaged).
2 Remove front drive bezel.
3 Replace CD-ROM drive mechanism.
4 Replace chassis harness cable.
1 Reset PRAM.
2 Replace chassis harness assembly.
1 Verify proper software installed.
2 Start up from known-good Disk Tools or external SCSI device.
3 Replace CD-ROM drive mechanism.
Troubleshooting Symptom Charts/Peripheral - 13
Peripheral
Cursor does not move 1 Check mouse connection.
2 If mouse was connected to keyboard, connect it to rear ADB
port instead. If mouse works, replace keyboard.
3 If mouse does not work in any ADB port, replace mouse.
4 Reset PRAM.
5 Replace logic board. Retain customer’s SIMMs.
Cursor moves, but
clicking the mouse
button has no effect
1 Replace mouse.
2 Replace logic board. Retain customer’s SIMMs.
Troubleshooting Symptom Charts/Peripheral
(Continued)
- 14
Cannot double-click
to open application,
disk, or server
No response to any
key on keyboard
Peripheral
1 Remove extra system files on hard drive.
2 Clear parameter RAM. Hold down <Command> <Option> <P>
<R> keys during system startup but before “Welcome to
Macintosh” appears.
3 If mouse was connected to keyboard, connect it to rear ADB
port instead. If mouse works, replace keyboard.
4 If mouse does not work in any ADB port, replace mouse.
5 Replace logic board. Retain customer’s SIMMs.
1 Check keyboard connection to ADB port.
2 Replace keyboard cable.
3 Replace keyboard.
4 Replace logic board. Retain customer’s SIMMs.
(Continued)
Troubleshooting Symptom Charts/Peripheral
(Continued)
- 15
Known-good
ImageWriter or
ImageWriter II does
not print
Known-good
LaserWriter does not
print
Peripheral
1 Make sure that Chooser and Control Panel are set correctly.
2 Replace printer driver and system software with known-
good.
3 Reset PRAM.
4 Replace printer interface cable.
5 Replace logic board. Retain customer’s SIMMs.
1 Make sure that Chooser and Control Panel are set correctly.
2 Replace printer driver and system software with known-
good.
3 Reset PRAM.
4 Refer to Network and Communications manual.
(Continued)
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