Apple macintosh iisi Service Manual

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Macintosh IIsi

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Basics

Macintosh IIsi

Basics	Overview - 1

Overview

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

Figure: Macintosh IIsi

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Specifications

IIsi

	Specifications	Processor - 1
		Processor
CPU		Motorola 68030 microprocessor
		20 MHz
		32-bit internal data bus
		256-byte instruction and data caches
		Burst-mode RAM access
		Built-in memory management unit (MMU)
Coprocessor		Motorola 68882 floating-point unit (FPU) included on the
		optional adapter card
		20 MHz

	Specifications	Memory - 2
		Memory
RAM		2 MB, expandable to 17 MB
ROM		512K standard
PRAM		256 bytes of parameter memory

Specifications	Disk Storage - 3

Floppy Drive

Hard Drive

Disk Storage

Internal 1.4 MB floppy drive

Internal 40 MB hard drive Optional internal 80 MB hard drive

Specifications	I/O Interfaces - 4

Expansion

SCSI

Serial

I/O Interfaces

One slot for either a NuBus or 030 direct slot card
Power available (15 W maximum)
+ 5 V	2.0 A
+12 V	175 A
-12 V	150 A

One external SCSI port; DB-25 connector

Two RS-422/RS-232/AppleTalk serial ports; mini DIN-8 connectors

	Specifications	I/O Devices - 5
		I/O Devices
Keyboard		Apple Keyboard, Apple Keyboard II, or Apple Extended Keyboard
		connected through Apple Desktop Bus (ADB) ports (mini
		DIN-4)
Mouse		ADB mouse (mini DIN-4)

Specifications	Sound and Video - 6

Sound and Video

Sound Generator

Output impedance of 8–600 ohms

Short-circuit protected

Disables internal speaker when in use

Four-voice, wavetable synthesis and stereo sampling generator

Specifications	Electrical - 7

Electrical

Line Voltage

Frequency

Maximum Power

100–240 VAC, automatically configured

50–60 Hz, single phase

100 W (not including monitor)

	Specifications	Physical - 8
		Physical
Dimensions		Height: 4.0 in. (10 cm)
		Width: 12.4 in. (31 cm)
		Depth: 14.9 in. (37.2 cm)
Weight		10 lb. (4.5 kg)
		Configuration of RAM, floppy drives, hard drives, and NuBus
		expansion cards will vary weight.

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Troubleshooting

IIsi

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	Adjust brightness on monitor.
and at least one drive			2	Verify monitor works with different Macintosh.
operate, fan is			3	Replace monitor. Refer to appropriate monitor manual to
running, and LED is				troubleshoot defective monitor.
lit			4	Replace video cable.
			5	Replace video card.
			6	Replace SIMMs. See Hardware/Memory.
			7	Replace logic board. Retain customer’s SIMMs.
			8	Replace power supply.

		Troubleshooting		Symptom Charts/Video (Continued) - 3
			Video (Continued)
Screen is dark, audio			1	Verify monitor works with different Macintosh.
and drive do not			2	Replace video cable.
operate, but fan is			3	Replace monitor. Refer to appropriate monitor manual to
running and LED is lit				troubleshoot defective monitor.
			4	Remove NuBus cards.
			5	Remove peripherals.
			6	Replace SIMMs. See Hardware/Memory.
			7	Replace logic board. Retain customer’s SIMMs.
			8	Replace power supply.
Partial or whole			1	Verify monitor works with different Macintosh.
screen is bright and			2	Replace monitor. Refer to appropriate monitor manual to
audio is present, but				troubleshoot defective monitor.
no video information			3	Replace video cable.
is visible			4	Replace logic board. Retain customer’s SIMMs.

	Troubleshooting		Symptom Charts/Video (Continued) - 4
		Video (Continued)
Screen is completely		1	Plug the monitor directly into a wall socket and verify that
dark, fan is not			the monitor has power.
running, and LED is		2	Remove NuBus card and switch on power again. (NuBus card
not lit			draws more than 45 watts.)
		3	Remove peripherals.
		4	Replace power supply.
		5	Replace logic board. Retain customer’s SIMMs.

Troubleshooting Symptom Charts/Floppy Drive - 5

Floppy Drive

Audio and video	1	Replace internal floppy drive cable.
present, but internal	2	Replace internal floppy drive.
floppy drive does not	3	Replace logic board. Retain customer’s SIMMs.
operate
Disk ejects; display	1	Replace floppy disk.
shows Mac icon with	2	Replace internal floppy drive cable.
blinking “X”	3	Replace internal floppy drive.
	4	Replace logic board. Retain customer’s SIMMs.
Disk will not eject	1	Switch off computer. Hold mouse button down while
		switching computer on.
	2	Eject disk manually.
	3	Replace floppy drive.

Troubleshooting Symptom Charts/Floppy Drive (Continued) - 6

Floppy Drive (Continued)

Drive attempts to	1	Push disk completely in.
eject disk but doesn’t	2	Remove top cover and attempt to eject the disk.
	3	Eject disk manually.
	4	Replace floppy drive.

Troubleshooting Symptom Charts/Hard Drive - 7

Hard Drive

Internal hard drive	1	Replace hard drive data cable.
runs continuously	2	Replace internal hard drive.
	3	Replace logic board. Retain customer’s SIMMs.
Internal hard drive	1	Replace hard drive data cable.
will not operate	2	Replace hard drive power cable.
	3	Replace hard drive.
	4	Replace logic board. Retain customer’s SIMMs.