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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
Coprocessor
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)
Motorola 68882 floating-point unit (FPU) included on the
optional adapter card
20 MHz
Specifications Memory - 2
Memory
RAM
ROM
PRAM
2 MB, expandable to 17 MB
512K standard
256 bytes of parameter memory
Specifications Disk Storage - 3
Disk Storage
Floppy Drive
Hard Drive
Internal 1.4 MB floppy drive
Internal 40 MB hard drive
Optional internal 80 MB hard drive
Specifications I/O Interfaces - 4
I/O Interfaces
Expansion
SCSI
Serial
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
Mouse
Apple Keyboard, Apple Keyboard II, or Apple Extended Keyboard
connected through Apple Desktop Bus (ADB) ports (mini
DIN-4)
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 V oltage
Frequency
Maximum Power
100–240 VAC, automatically configured
50–60 Hz, single phase
100 W (not including monitor)
Specifications Physical - 8
Physical
Dimensions
Weight
Height: 4.0 in. (10 cm)
Width: 12.4 in. (31 cm)
Depth: 14.9 in. (37.2 cm)
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
and at least one drive
operate, fan is
running, and LED is
lit
1 Adjust brightness on monitor.
2 Verify monitor works with different Macintosh.
3 Replace monitor. Refer to appropriate monitor manual to
troubleshoot defective monitor.
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
Screen is dark, audio
and drive do not
operate, but fan is
running and LED is lit
Partial or whole
screen is bright and
audio is present, but
no video information
is visible
Video
1 Verify monitor works with different Macintosh.
2 Replace video cable.
3 Replace monitor. Refer to appropriate monitor manual to
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.
1 Verify monitor works with different Macintosh.
2 Replace monitor. Refer to appropriate monitor manual to
3 Replace video cable.
4 Replace logic board. Retain customer’s SIMMs.
(Continued)
troubleshoot defective monitor.
troubleshoot defective monitor.
Troubleshooting Symptom Charts/Video
(Continued)
- 4
Screen is completely
dark, fan is not
running, and LED is
not lit
Video
1 Plug the monitor directly into a wall socket and verify that
2 Remove NuBus card and switch on power again. (NuBus card
3 Remove peripherals.
4 Replace power supply.
5 Replace logic board. Retain customer’s SIMMs.
(Continued)
the monitor has power.
draws more than 45 watts.)
Troubleshooting Symptom Charts/Floppy Drive - 5
Floppy Drive
Audio and video
present, but internal
floppy drive does not
operate
Disk ejects; display
shows Mac icon with
blinking “X”
Disk will not eject 1 Switch off computer. Hold mouse button down while
1 Replace internal floppy drive cable.
2 Replace internal floppy drive.
3 Replace logic board. Retain customer’s SIMMs.
1 Replace floppy disk.
2 Replace internal floppy drive cable.
3 Replace internal floppy drive.
4 Replace logic board. Retain customer’s SIMMs.
switching computer on.
2 Eject disk manually.
3 Replace floppy drive.
Troubleshooting Symptom Charts/Floppy Drive
(Continued)
- 6
Drive attempts to
eject disk but doesn’t
Floppy Drive
1 Push disk completely in.
2 Remove top cover and attempt to eject the disk.
3 Eject disk manually.
4 Replace floppy drive.
(Continued)
Troubleshooting Symptom Charts/Hard Drive - 7
Hard Drive
Internal hard drive
runs continuously
Internal hard drive
will not operate
1 Replace hard drive data cable.
2 Replace internal hard drive.
3 Replace logic board. Retain customer’s SIMMs.
1 Replace hard drive data cable.
2 Replace hard drive power cable.
3 Replace hard drive.
4 Replace logic board. Retain customer’s SIMMs.
Troubleshooting Symptom Charts/Peripheral - 8
Peripheral
Works with internal
hard drive or
external SCSI device
but not with both
Cursor does not move 1 Reboot computer.
1 Verify that SCSI select switch on external device shows a
different priority from internal hard drive.
2 Replace terminator on the external device.
3 Verify that internal hard drive has a terminator.
4 Replace SCSI select cable.
2 Verify mouse connection.
3 If mouse was connected to keyboard, connect the mouse to a
computer ADB port and disconnect the keyboard. If mouse
works, replace keyboard.
4 If mouse does not work in any ADB port on computer, replace
mouse.
5 Remove additional NuBus cards.
6 Replace logic board. Retain customer’s SIMMs.
Troubleshooting Symptom Charts/Peripheral
(Continued)
- 9
Cursor moves, but
clicking the mouse
button has no effect
Double-click does not
open an application,
disk, or server
Peripheral
1 Replace mouse.
2 Replace logic board. Retain customer’s SIMMs.
1 Remove duplicate system files.
2 Clear parameter RAM. System 7: Hold down <Command>
<Option> <P> <R> during startup but before “Welcome to
Macintosh” appears. System 6 and earlier: Hold down
<Command> <Option> <Shift> keys and select Control Panel
from Apple menu.
3 If mouse was connected to keyboard, connect the mouse to a
computer ADB port instead and disconnect the keyboard. If
mouse works, replace keyboard.
4 If mouse does not work in any ADB port on computer, replace
mouse.
5 Replace logic board. Retain customer’s SIMMs.
(Continued)
Troubleshooting Symptom Charts/Peripheral
(Continued)
- 10
No response to any
key on the keyboard
Known-good
ImageWriter® or
ImageWriter II won’t
print
Peripheral
1 Verify keyboard connection to ADB port.
2 Replace keyboard cable.
3 Replace keyboard.
4 Replace logic board. Retain customer’s SIMMs.
1 Verify that the System is version 6.0.7 (or later).
2 Verify that the Chooser and Control Panel settings are
correct.
3 Check printer DIP switches.
4 Reset PRAM.
5 Replace printer interface cable.
6 Replace logic board. Retain customer’s SIMMs.
(Continued)
Troubleshooting Symptom Charts/Peripheral
(Continued)
- 11
Known-good
LaserWriter® won’t
print
Peripheral
1 Verify that the System is version 6.0.7 (or later).
2 Verify that the Chooser and Control Panel settings are
correct.
3 Reset PRAM.
4 Refer to the Networking and Communications manual.
(Continued)
Troubleshooting Symptom Charts/Miscellaneous - 12
Miscellaneous
Clicking, chirping,
or thumping
System shuts down
intermittently
1 Replace power supply.
2 Disconnect hard drive. If noise disappears, replace drive.
3 Replace logic board. Retain customer’s SIMMs.
1 Check that air vents on the back and top of the case are
unobstructed. (Thermal protection circuitry may shut down
the system. After 30 to 40 minutes, the system should run.)
2 Replace power cord.
3 Replace power supply.
4 Replace logic board. Retain customer’s SIMMs.
Troubleshooting Symptom Charts/Miscellaneous
(Continued)
- 13
System
intermittently
crashes or locks up
No sound from
speaker
Miscellaneous
1 Verify that the System is version 6.0.7 (or later).
2 Verify that software is known-good.
3 Remove additional RAM and NuBus cards.
4 Replace logic board. Retain customer’s SIMMs.
5 Replace SIMMs. See Hardware/Memory.
6 Replace power supply.
1 Verify that volume setting in the Control Panel is 1 or above.
2 Reset PRAM.
3 Replace speaker.
4 Replace logic board. Retain customer’s SIMMs.
(Continued)
Troubleshooting Symptom Charts/Miscellaneous
(Continued)
- 14
Miscellaneous
Clock not running 1 Replace battery. See “Battery Verification” in Additional
Procedures.
2 Reset PRAM.
3 Replace logic board. Retain customer’s SIMMs.
System seems to boot;
then message “Finder
is old version”
appears
System restarts itself Set the locking power switch on the rear of the computer to the
1 Clear parameter RAM. System 7: Hold down <Command>
<Option> <P> <R> during startup but before “Welcome to
Macintosh” appears. System 6 and earlier: Hold down
<Command> <Option> <Shift> keys and select Control Panel
from Apple menu.
2 Replace logic board. Retain customer’s SIMMs.
unlocked (horizontal) position.
(Continued)
Troubleshooting Symptom Charts/Error Chords - 15
Error Chords
Error chord sounds
during startup
sequence
1 Perform SIMM verification on customer’s logic board.
2 Replace logic board. Retain customer’s SIMMs.
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T ak e Apart
IIsi
Take Apart Cover - 1
Cover
No preliminary steps are
required before you begin
this procedure.
Push down on the small tabs
with your thumbs and at the
same time lift up on the
large tabs with your
forefingers. (The cover may
make a loud snap.)
Take Apart Fan - 2
Fan
Before you begin, remove
the following:
• Cover
Fan
• Expansion card
Caution:
precautions in Bulletins/
Safety.
Review the ESD
Take Apart Fan - 3
Place your thumbs under the
fan and using some force
pull up until the fan snaps
free.
Take Apart Power Supply - 4
Power Supply
Before you begin, remove
the following:
Power Supply
• Cover
• Expansion card
• Fan
Caution:
precautions in Bulletins/
Safety.
Review the ESD
Take Apart Power Supply - 5
1 Press the two metal tabs
near the rear of the
power supply and lift the
Metal Tabs
power supply about 1/2
inch.
2 Pull the silver-colored
tab toward the floppy
Silver-Colored
Tab
drive and at the same
time lift the power
supply out of the case.
Take Apart Hard Drive - 6
Hard Drive
Before you begin, remove
the cover.
Hard Drive
Caution:
precautions in Bulletins/
Safety.
Review the ESD
Take Apart Hard Drive - 7
1 Disconnect the hard
drive power cable and
Hard Drive
Power Cable
Hard Drive Data Cable
hard drive data cable
from the logic board.
Take Apart Hard Drive - 8
2 Release the two tabs and
lift the drive (along with
its carrier) out of the
computer.
Replacement Note:
information on removing
the hard drive from the
carrier and returning
drives, cables, and
carriers to Apple, refer
to Additional Procedures
in the Hard Drives
manual.
For
Take Apart Floppy Drive - 9
Floppy Drive
Before you begin, remove
the cover.
Floppy Drive
Caution:
precautions in Bulletins/
Safety.
Review the ESD
Take Apart Floppy Drive - 10
1 Disconnect the floppy
drive cable from the
Floppy Drive Cable
logic board.
2 Release the two tabs and
lift the floppy drive out
of the computer.
Replacement Note:
Apple recommends using
dust shields on 1.4 MB
SuperDrives in
Macintosh IIsi
computers. All 1.4 MB
replacement drives ship
with the dust shield
already installed.
Take Apart Floppy Drive - 11
If you plan to install a
dust shield on the
current drive, you must
first clean the drive.
Take Apart Logic Board - 12
Logic Board
Before you begin, remove
the following:
Logic Board
• Cover
• Adapter card
• Fan
• Power supply
Caution:
precautions in Bulletins/
Safety.
Review the ESD
Take Apart Logic Board - 13
1 Disconnect these cable
connectors from the
logic board:
• Hard drive power
cable
• Hard drive data cable
Hard Drive
Power Cable
Hard Drive Data Cable
Floppy Drive Cable
• Floppy drive cable
Take Apart Logic Board - 14
2 With the rear of the case
facing you, release the
two tabs with your
forefingers and at the
120-Pin Connector
same time push on the
120-pin connector with
your right thumb.
Release
Tab
3 Slide the logic board
toward the front of the
case until the board
stops.
Release Tab
Take Apart Logic Board - 15
4
Caution:
Be sure the
power on/off button
J20 Connector
(underneath)
clears the rear panel
before you lift the logic
board out of the case.
While lifting the board,
do not touch connector
J19 Connector
J19 or J20. (The oil
from your skin harms
the connectors.)
Gently lift the board out
of the case.
Power On/Off Button
Take Apart Logic Board - 16
Replacement Note:
the SIMMs from the
defective logic board and
install them on the
replacement logic board.
Remove
Take Apart Speaker - 17
Speaker
Before you begin, remove
the following:
• Cover
• Adapter card
• Fan
• Power supply
• Hard drive
• Logic board
Speaker
Take Apart Speaker - 18
1 Push the LED out of the
holder.
2 Carefully remove the
LED cables from the two
cable holders.
LED Cables
Cable Holders
LED
LED Holder
Take Apart Speaker - 19
3 Release the four clips
and lift the speaker out
of the case.
Clip
Clip
ClipClip
Replacement Note:
When you replace the
speaker and logic board,
make sure the metal
connector fingers of the
speaker contact the
metal fingers on the
underside of the logic
board.
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Upgrades
IIsi
Upgrades Adapter/030 Direct Slot Card - 1
Adapter/030
Slot Card
030 Adapter Card
Plastic Bracket030 Direct
Direct Slot Card
Before you begin, remove
the cover.
Caution:
precautions in Bulletins/
Safety.
Note:
procedure explains how to
remove the 030 adapter
card, 030 direct slot card,
and plastic bracket.
Review the ESD
The following
Upgrades Adapter/030 Direct Slot Card - 2
1 Pull straight up on the
030 Direct Slot Card030 Adapter Card
adapter card and
carefully remove it and
the direct slot card from
the logic board.
Upgrades Adapter/030 Direct Slot Card - 3
2 If you are replacing the
direct slot card, place
the adapter card on a flat
surface, and carefully
pull the direct slot card
030 Direct
Slot Card
Connector
030 Adapter Card
from the adapter card
connector.
Upgrades Adapter/030 Direct Slot Card - 4
3 To remove the plastic
bracket, press on the
latch with a screwdriver
and lift the bracket
from the power supply.
Latch
Replacement Note:
If
you are replacing the
direct slot card, retain
the plastic bracket and
Plastic Bracket
use it with the
replacement card.
Upgrades Adapter/NuBus Card - 5
Adapter/NuBus
NuBus Card
Card
Before you begin, remove
the cover.
NuBus Adapter Card
Caution:
precautions in Bulletins/
Safety.
Review the ESD
Upgrades Adapter/NuBus Card - 6
Access
Port
Metal Bracket
NuBus
Adapter Card
NuBus Card
1 Remove the screws that
secure the NuBus
adapter card to the
access port.
2 Pull straight up on the
metal bracket and
remove the bracket,
NuBus card, and adapter
card from the computer.
Upgrades Adapter/NuBus Card - 7
3 If you are replacing the
NuBus card, place the
NuBus Card
adapter card on a flat
surface, and carefully
pull the NuBus card
from the adapter card
connector.
Metal Bracket
NuBus Adapter Card
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Additional Procedures
IIsi
Additional Procedures Battery Verification - 1
Battery Verification
Before you begin, remove
Lithium Battery
the cover.
Caution:
precautions in Bulletins/
Safety.
Warning:
discarded improperly, the
lithium battery in the
Macintosh IIsi could explode.
Review battery-handling
and disposal instructions in
Bulletins/Safety.
Review the ESD
If handled or
Additional Procedures Battery Verification - 2
1 Set the voltmeter to the
10 volts DC scale.
2 Hold the positive probe
of the voltmeter to the
Negative
Probe
positive end of the
battery and the negative
probe to the negative
Positive
Probe
end of the battery.
3 If the battery voltage is
below 3.0 volts, replace
the battery. Refer to
“Battery Replacement”
in this chapter.
Additional Procedures Battery Replacement - 3
Battery Replacement
Before you begin, remove
Lithium Battery
the following:
• Cover
• Expansion cards
±
Warning:
discarded improperly, the
lithium battery in the
Macintosh IIsi could explode.
Review battery-handling
and disposal instructions in
Bulletins/Safety.
If handled or
Additional Procedures Battery Replacement - 4
1 Using a small flat-blade
screwdriver, pry open
the latch at the end of the
holder and lift off the
cover.
Additional Procedures Battery Replacement - 5
2 Grasp the battery and
remove it from the
holder.
3 Return the battery to
Apple for proper
disposal. For battery
packaging and labeling
instructions, refer to
the safety information in
Bulletins/Safety.
Replacement Caution:
Match the battery end
marked “+” to the “+”
on the battery holder.
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Exploded V ie w
Macintosh IIsi
Exploded View 1
Exploded View
Top Case
630-5804
Fan
Assembly
810-6030
Power
Supply
661-1616
Adaptor
Card and
Bracket
815-6246
Hard
Drive
Data
Cable
591-0026
Hard
Drive
Power
Cable
591-0027
Hard
Drive
Carrier
805-0980
444-6104
Hard
Drive
661-0216 (40 MB)
Logic
Board
661-1615
Internal
Floppy
Drive
Cable
591-0025
Floppy
Drive
Carrier
805-0961
Floppy
Drive
661-0474
844-0018
Bottom
Case
810-6032
865-0024
Speaker/
LED
Assembly
810-6031
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