Apple macintosh se Service Manual

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Macintosh SE

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Basics

Macintosh SE

Basics	Overview - 1

Overview

This manual contains complete repair procedures for the Macintosh SE, shown at left.

Figure: Macintosh SE

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Specifications

Macintosh SE

	Specifications	Processor - 1
		Processor
CPU		Motorola 68000 microprocessor
		7.83 MHz
		32-bit architecture

	Specifications	Memory - 2
		Memory
RAM		1 or 2 MB, expandable to 4 MB
ROM		256K
PRAM		256 bytes of memory
		CMOS custom chip with seven-year lithium battery

Specifications	Disk Storage - 3

Floppy Drive

Hard Drive

Disk Storage

1.4 MB floppy drive

Optional second internal and external floppy drive

Optional 20 or 40 MB hard drive

Optional external hard drive

Specifications	I/O Interfaces - 4

Expansion

SCSI

Apple Desktop Bus

Serial

Sound

I/O Interfaces

Macintosh SE expansion slot; uses a 96-pin Euro-DIN connector

Uses a 50-pin connector (internal) and a DB-25 connector (external)

Two Apple Desktop Bus (ADB) connectors for communication with keyboard, mouse, and other input devices

Two RS-232/RS-422 serial ports; 230.4 Kbaud maximum; mini DIN-8 connectors

For external audio amplifier (standard miniature)

	Specifications	I/O Devices - 5
		I/O Devices
Keyboards		Apple Keyboard: 81 keys, including numeric keypad and cursor
		keys
		Apple Extended Keyboard: 105 keys, including 15 function keys,
		separate cursor pad, and 10-key numeric keypad
Mouse		Mechanical tracking; optical shaft at 3.94 pulses per mm (100
		pulses per in.) of travel; ADB connector

Specifications	Sound and Video - 6

Sound Generator

Video Display

Sound and Video

Four-voice sound with 8-bit digital/analog conversion using 22kHz sampling rate

9-in. (diagonal) screen; high-resolution, 512 by 342 pixel, bit-mapped display

Specifications	Electrical - 7

Electrical

Line Voltage

Frequency

Maximum Power

90–140 VAC; 170–270 VAC

47–63 Hz

100 W

	Specifications	Physical - 8
		Physical
Dimensions		Height: 13.6 in. (34.5 cm)
		Width: 9.6 in. (24.4 cm)
		Depth: 10.9 in. (27.6 cm)
Weight		17–21 lb. (7.7–9.5 kg)
		Weight varies depending on whether hard drive or second floppy
		drive is installed

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Troubleshooting

Macintosh SE

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 dark; audio			1	Turn brightness control clockwise.
and drive operate			2	Check video cable connections.
			3	Replace analog board.
			4	Replace video board.
			5	Replace logic board. Retain customer’s SIMMs.
			6	Replace CRT.
Screen is bright and			1	Replace analog board.
audio is present, but			2	Replace video board.
no video information			3	Replace logic board. Retain customer’s SIMMs.
is visible

		Troubleshooting		Symptom Charts/Video (Continued) - 3
			Video (Continued)
Screen is completely			1	Replace power supply.
dark and fan is not			2	Replace analog board.
running
Single vertical line is			1	Replace analog board.
displayed			2	Replace video board.
			3	Replace logic board. Retain customer’s SIMMs.
			4	Replace CRT.
Single horizontal line			1	Replace analog board.
is displayed			2	Replace video board.
			3	Replace logic board. Retain customer’s SIMMs.
			4	Replace CRT.

	Troubleshooting		Symptom Charts/Video (Continued) - 4
		Video (Continued)
Vertical bars or		1	Replace logic board. Retain customer’s SIMMs.
stripes are displayed		2	Replace analog board.
Horizontal bars or		1	Replace logic board. Retain customer’s SIMMs.
stripes are displayed		2	Replace analog board.
White dot is displayed		1	Verify that yoke cable is connected.
in center of screen		2	Replace analog board.
		3	Replace CRT.
Screen jitters at top		Replace analog board.
left and/or lower
right

Troubleshooting Symptom Charts/Peripheral - 5

Peripheral

Cursor does not move	1	Check mouse connection.
	2	Inspect inside of mouse for buildup of dirt and other
		contaminants. Clean mouse if necessary.
	3	If mouse was connected to keyboard, connect it to 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.
Cursor moves, but	1	Replace mouse.
clicking mouse	2	Replace logic board. Retain customer’s SIMMs.
button has no effect
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) - 6
		Peripheral (Continued)

Cannot double-click to open application, disk, or server

1Remove any multiple system files on hard drive.

2Clear parameter RAM. (System 7: Hold down <Command> <Option> <P> <R> during startup but before “Welcome to Macintosh” appears. System 6: Hold down <Command> <Option> <Shift> keys and select Control Panel from Apple pull-down menu.) Reset mouse controls.

3If mouse was connected to keyboard, connect it to ADB port instead. If mouse works, replace keyboard.

4If mouse does not work in any ADB port, replace mouse.

5Replace logic board. Retain customer’s SIMMs.

	Troubleshooting		Symptom Charts/Peripheral (Continued) - 7
		Peripheral (Continued)
Known-good		1	Make sure that Chooser and Control Panel are set correctly.
LaserWriter does not		2	Make sure correct version of system software is being used.
print			Make sure software is known-good.
		3	Reset PRAM.
		4	Refer to Networks and Communications manual.
Known-good		1	Make sure that Chooser and Control Panel are set correctly.
ImageWriter or		2	Make sure correct version of system software is being used.
ImageWriter II does			Make sure software is known-good.
not print		3	Reset PRAM.
		4	Replace printer interface cable.
		5	Replace logic board. Retain customer’s SIMMs.

Troubleshooting Symptom Charts/Floppy Drive - 8

Floppy Drive

Audio and video are	1	Replace bad disk.
present, but one	2	Replace floppy drive data cable.
internal floppy drive	3	Replace internal floppy drive.
does not operate	4	Replace logic board. Retain customer’s SIMMs.
External floppy drive	1	Replace bad disk.
does not operate	2	Make sure external floppy drive is on right side of Macintosh
		SE/30.
	3	Replace external drive.
	4	Replace logic board. Retain customer’s SIMMs.
Disk ejects; display	1	Replace disk with known-good system disk.
shows icon with	2	Replace floppy drive.
blinking “X”	3	Replace logic board. Retain customer’s SIMMs.

Troubleshooting Symptom Charts/Floppy Drive (Continued) - 9

Floppy Drive (Continued)

Unable to insert disk	1	Insert opened paper clip into hole beside drive.
all the way	2	Switch off system power and hold mouse button down while
		switching power back on (to complete eject cycle).
	3	Replace floppy drive.
Internal floppy drive	1	Replace bad disk.
runs continuously	2	Replace floppy drive.
	3	Replace logic board. Retain customer’s SIMMs.
	4	Replace floppy drive data cable.
Does not eject disk	1	Insert opened paper clip into hole beside drive.
	2	Switch off system and hold mouse button down while
		switching system back on (to complete eject cycle).
	3	Replace floppy drive.

Troubleshooting Symptom Charts/Floppy Drive (Continued) - 10

Floppy Drive (Continued)

Audio and video are	1	Replace bad disk.
present, but neither	2	Replace logic board. Retain customer’s SIMMs.
internal floppy drive
operates

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	Replace hard drive data cable.
operate	3	Replace hard drive.
	4	Replace logic board. Retain customer’s SIMMs.
Works with internal	1	Verify SCSI device switch setting on external device.
or external SCSI	2	Replace terminator on external device.
device but not with	3	Verify that terminator is installed on internal hard drive.
both	4	Replace hard drive select cable.

Troubleshooting Symptom Charts/Miscellaneous - 12

Miscellaneous

Clicking, chirping,	1	Verify analog board cable is connected at J12 on logic board.
or thumping sound	2	Replace power supply.
	3	Replace analog board.
	4	Replace logic board. Retain customer’s SIMMs.
Smoke/odor	1	Replace power supply.
	2	Replace analog board.
No video, no audio, and	1	Connect power cord.
no drive operation	2	Switch power on.
	3	Replace power cord.
	4	Replace power supply.
	5	Replace analog board.
	6	Replace logic board. Retain customer’s SIMMs.

Troubleshooting Symptom Charts/Miscellaneous (Continued) - 13

Miscellaneous (Continued)

“Sad Macintosh” icon	1	Replace bad disk.
	2	Replace SIMM(s) if code matches any of those given in
		“Isolating a Faulty SIMM” in Hardware/Memory.
	3	Verify that three-pin jumper on logic board is configured
		correctly for system RAM. See Hardware/Memory.
	4	Replace logic board. Retain customer’s SIMMs.
“Sad Macintosh” icon	1	Verify that three-pin jumper on logic board is configured
and black vertical		correctly for system RAM. See Hardware/Memory.
line are displayed;	2	Replace logic board. Retain customer’s SIMMs.
screeching sound

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Take Apart

Macintosh SE

Take Apart	Cover - 1
Cover	Cover
	No preliminary steps are
	required before you begin
	this procedure.
	±Warning: This product
	contains high voltage and a
	high-vacuum picture tube.
	To prevent serious injury,
	review CRT safety in
	Bulletins/Safety.
	1 Using a small
	screwdriver, pry off
	the reset/interrupt
	switch (if present).

Take Apart	Cover - 2
2	Using a Torx
	screwdriver, remove
	the four case screws and
	separate the cover from
	the chassis with a pull-
	apart tool.
3	Carefully lift up the
	cover and set it aside.
4	Remove the paper
	insulating shroud from
	the bottom of the
	computer.

Take Apart	Cover - 3

Replacement Note:

Reinstall the two black case screws in the bottom of the cover and the two silvercolored case screws in the top of the cover.