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

RAM

ROM

PRAM

VRAM

Memory

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

Serial

SCSI

Apple Desktop Bus

I/O Interfaces

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		For remote control
Sound		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

Keyboard

Mouse

Speaker

I/O Devices

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 Generator

Video Display

Sound and Video

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 Voltage

Frequency

Maximum Power

100–240 VAC; Universal power supply

47–63 Hz, single phase

120 W

	Specifications	Physical - 9
		Physical
Dimensions		Height: 17.9 in. (45.5 cm)
		Width: 13.5 in. (34.4 cm)
		Depth: 16.5 in. (42.0 cm)
Weight		41.5 lb. (18.9 kg)

Specifications	Environmental - 10

Operating

Temperature

Storage

Temperature

Relative Humidity

Altitude

Environmental

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			1	Adjust contrast button on front bezel.
dark, or too bright;			2	Adjust brightness. Use Brightness Control Panel.
audio and drive			3	Reset PRAM.
operate			4	Check yoke cable connection.
			5	Perform video adjustments. Refer to “Video” in Adjustments
				chapter.
			6	Replace analog board.
			7	Replace CRT.
Out of convergence			1	Perform convergence adjustment. Refer to “Convergence” in
(color bleeds from				Adjustments chapter.
text or lines)			2	Replace analog board.
			3	Replace CRT.

		Troubleshooting		Symptom Charts/Video (Continued) - 3
			Video (Continued)
Single vertical or			Note: A thin, gray, horizontal line may be visible across the
horizontal line is			bottom third of a lit screen. This line is inherent in the design of
displayed			Trinitron monitors. Do not replace modules.
			Otherwise,
			1	Replace analog board.
			2	Replace CRT.
Predominant color			1	Perform video adjustments. Refer to “Video” in Adjustments
tint or color cannot be				chapter.
adjusted			2	Replace analog board.
			3	Replace CRT if red, green, or blue cannot be turned off using
				appropriate controls.

		Troubleshooting		Symptom Charts/Video (Continued) - 4
			Video (Continued)
Screen is bright and			1	Perform video adjustments. Refer to “Video” in Adjustments
audio is present, but				chapter.
no video information			2	Replace analog board.
is visible			3	Replace chassis harness cable.
			4	Replace CRT.
Picture breaks into			1	Perform video adjustments. Refer to “Video” in Adjustments
diagonal lines, or				chapter.
picture rolls			2	Replace analog board.
vertically or
horizontally
Black screen spots			Replace CRT.
(burnt phosphors)

		Troubleshooting		Symptom Charts/Video (Continued) - 5
			Video (Continued)
Screen jitters or			1	Verify that adjacent computer equipment is properly
flashes				grounded. Move electrical devices away from monitor.
				Temporarily shut off all fluorescent lights in area.
			2	Check that all ground cables are secure.
			3	Disconnect floppy drive, CD-ROM drive and hard drive.
			4	Replace analog board.
Out of focus			1	Perform focus adjustment. Refer to “Focus” in Adjustments
				chapter.
			2	Replace analog board.
			3	Replace CRT only if one part of display remains out of focus
				despite adjustment of focus controls to their limits.

		Troubleshooting		Symptom Charts/Video (Continued) - 6
			Video (Continued)
Flashing or wavy			Replace analog board.
screen, or monitor
emits high-pitched
noise
Raster size too short/			1	Adjust horizontal or vertical size control. Refer to
tall or narrow/wide				Adjustments chapter.
			2	Replace analog board.
Linearity bad (size of			1	Perform video adjustments. Refer to “Video” in the
text/graphics differs				Adjustments chapter.
at top, bottom, or			2	Replace analog board.
sides of screen)

		Troubleshooting		Symptom Charts/Video (Continued) - 7
			Video (Continued)
Raster tilted or			1	Verify that adjacent computer equipment is properly
shifted				grounded. Move electrical devices away from monitor.
				Temporarily shut off all fluorescent lights in area.
			2	Perform appropriate geometric adjustments (see
				Adjustments chapter).
			3	Perform yoke adjustment. Refer to “Yoke” in Adjustments
				chapter.
			4	Replace analog board.
Raster distorted			1	Verify that adjacent computer equipment is properly
(barrel-shaped,				grounded. Move electrical devices away from monitor.
corners not square,				Temporarily shut off all fluorescent lights in area.
stretched or			2	Perform appropriate geometric adjustments (see
compressed at top of				Adjustments chapter).
display, or sides not			3	Replace analog board.
perpendicular)			4	Replace CRT (only in rare instances).

	Troubleshooting		Symptom Charts/Video (Continued) - 8
		Video (Continued)
Raster not centered		1	Verify that adjacent computer equipment is properly
			grounded. Move electrical devices away from monitor.
			Temporarily shut off all fluorescent lights in area.
		2	Adjust horizontal or vertical center control. Refer to
			Adjustments chapter.
		3	Replace analog board.

Troubleshooting Symptom Charts/Floppy Drive - 9

Floppy Drive

Audio and video are	1	Replace bad disk with known-good disk.
present, but internal	2	Replace floppy drive.
floppy drive does not	3	Replace logic board. Retain customer’s SIMMs.
operate	4	Replace chassis harness cable.
Disk ejects; display	1	Replace bad system disk with known-good system disk.
shows icon with	2	Replace floppy drive.
blinking “X”	3	Replace logic board. Retain customer’s SIMMs.
	4	Replace chassis harness cable.
Unable to insert disk	1	To eject previously inserted disk, insert opened paper clip
all the way		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 (Continued)

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	1	Replace bad disk with known-good disk.
runs continuously	2	Replace floppy drive.
	3	Replace logic board. Retain customer’s SIMMs.

Troubleshooting Symptom Charts/Hard Drive - 11

Hard Drive

Internal or external	1	Verify that SCSI loopback card is not attached.
hard drive does not	2	Verify that external drive is properly terminated.
operate	3	Replace hard drive.
	4	Replace logic board. Retain customer’s SIMMs.
Works with internal	1	Verify that SCSI device ID switch setting on external device
or external SCSI		is higher than 0. Also verify that ID switch setting on
device but does not		external SCSI device does not duplicate ID switch settings on
work with both		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	1	Replace disc (if dirty or damaged).
not accept disc	2	Remove front drive bezel.
	3	Replace CD-ROM drive mechanism.
	4	Replace chassis harness cable.
Volume control does	1	Reset PRAM.
not operate correctly	2	Replace chassis harness assembly.
Macintosh cannot	1	Verify proper software installed.
mount CD-ROM drive	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	1	Replace mouse.
clicking the mouse	2	Replace logic board. Retain customer’s SIMMs.
button has no effect

		Troubleshooting		Symptom Charts/Peripheral (Continued) - 14
			Peripheral (Continued)
Cannot double-click			1	Remove extra system files on hard drive.
to open application,			2	Clear parameter RAM. Hold down <Command> <Option> <P>
disk, or server				<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.
No response to any			1	Check keyboard connection to ADB port.
key on keyboard			2	Replace keyboard cable.
			3	Replace keyboard.
			4	Replace logic board. Retain customer’s SIMMs.

	Troubleshooting		Symptom Charts/Peripheral (Continued) - 15
		Peripheral (Continued)
Known-good		1	Make sure that Chooser and Control Panel are set correctly.
ImageWriter or		2	Replace printer driver and system software with known-
ImageWriter II does			good.
not print		3	Reset PRAM.
		4	Replace printer interface cable.
		5	Replace logic board. Retain customer’s SIMMs.
Known-good		1	Make sure that Chooser and Control Panel are set correctly.
LaserWriter does not		2	Replace printer driver and system software with known-
print			good.
		3	Reset PRAM.
		4	Refer to Network and Communications manual.