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
ROM
PRAM
1 or 2 MB, expandable to 4 MB
256K
256 bytes of memory
CMOS custom chip with seven-year lithium battery
Specifications Disk Storage - 3
Disk Storage
Floppy Drive
Hard Drive
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
I/O Interfaces
Expansion
SCSI
Apple Desktop Bus
Serial
Sound
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
Mouse
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
Mechanical tracking; optical shaft at 3.94 pulses per mm (100
pulses per in.) of travel; ADB connector
Specifications Sound and Video - 6
Sound and Video
Sound Generator
Video Display
Four-voice sound with 8-bit digital/analog conversion using 22-
kHz sampling rate
9-in. (diagonal) screen; high-resolution, 512 by 342 pixel,
bit-mapped display
Specifications Electrical - 7
Electrical
Line V oltage
Frequency
Maximum Power
90–140 VAC; 170–270 VAC
47–63 Hz
100 W
Specifications Physical - 8
Physical
Dimensions
Weight
Height: 13.6 in. (34.5 cm)
Width: 9.6 in. (24.4 cm)
Depth: 10.9 in. (27.6 cm)
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
and drive operate
Screen is bright and
audio is present, but
no video information
is visible
1 Turn brightness control clockwise.
2 Check video cable connections.
3 Replace analog board.
4 Replace video board.
5 Replace logic board. Retain customer’s SIMMs.
6 Replace CRT.
1 Replace analog board.
2 Replace video board.
3 Replace logic board. Retain customer’s SIMMs.
Troubleshooting Symptom Charts/Video
(Continued)
- 3
Screen is completely
dark and fan is not
running
Single vertical line is
displayed
Single horizontal line
is displayed
Video
1 Replace power supply.
2 Replace analog board.
1 Replace analog board.
2 Replace video board.
3 Replace logic board. Retain customer’s SIMMs.
4 Replace CRT.
1 Replace analog board.
2 Replace video board.
3 Replace logic board. Retain customer’s SIMMs.
4 Replace CRT.
(Continued)
Troubleshooting Symptom Charts/Video
(Continued)
- 4
Vertical bars or
stripes are displayed
Horizontal bars or
stripes are displayed
White dot is displayed
in center of screen
Screen jitters at top
left and/or lower
right
Video
1 Replace logic board. Retain customer’s SIMMs.
2 Replace analog board.
1 Replace logic board. Retain customer’s SIMMs.
2 Replace analog board.
1 Verify that yoke cable is connected.
2 Replace analog board.
3 Replace CRT.
Replace analog board.
(Continued)
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
clicking mouse
button has no effect
No response to any
key on keyboard
1 Replace mouse.
2 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.
Troubleshooting Symptom Charts/Peripheral
(Continued)
- 6
Cannot double-click
to open application,
disk, or server
Peripheral
1 Remove any multiple system files on hard drive.
2 Clear 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.
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.
(Continued)
Troubleshooting Symptom Charts/Peripheral
(Continued)
- 7
Known-good
LaserWriter does not
print
Known-good
ImageWriter or
ImageWriter II does
not print
Peripheral
1 Make sure that Chooser and Control Panel are set correctly.
2 Make sure correct version of system software is being used.
Make sure software is known-good.
3 Reset PRAM.
4 Refer to Networks and Communications manual.
1 Make sure that Chooser and Control Panel are set correctly.
2 Make sure correct version of system software is being used.
Make sure software is known-good.
3 Reset PRAM.
4 Replace printer interface cable.
5 Replace logic board. Retain customer’s SIMMs.
(Continued)
Troubleshooting Symptom Charts/Floppy Drive - 8
Floppy Drive
Audio and video are
present, but one
internal floppy drive
does not operate
External floppy drive
does not operate
Disk ejects; display
shows icon with
blinking “X”
1 Replace bad disk.
2 Replace floppy drive data cable.
3 Replace internal floppy drive.
4 Replace logic board. Retain customer’s SIMMs.
1 Replace bad disk.
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.
1 Replace disk with known-good system disk.
2 Replace floppy drive.
3 Replace logic board. Retain customer’s SIMMs.
Troubleshooting Symptom Charts/Floppy Drive
(Continued)
- 9
Floppy Drive
Unable to insert disk
all the way
Internal floppy drive
runs continuously
Does not eject disk 1 Insert opened paper clip into hole beside drive.
1 Insert opened paper clip into hole beside drive.
2 Switch off system power and hold mouse button down while
switching power back on (to complete eject cycle).
3 Replace floppy drive.
1 Replace bad disk.
2 Replace floppy drive.
3 Replace logic board. Retain customer’s SIMMs.
4 Replace floppy drive data cable.
2 Switch off system and hold mouse button down while
switching system back on (to complete eject cycle).
3 Replace floppy drive.
(Continued)
Troubleshooting Symptom Charts/Floppy Drive
(Continued)
- 10
Audio and video are
present, but neither
internal floppy drive
operates
Floppy Drive
1 Replace bad disk.
2 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 not with
both
1 Verify that SCSI loopback card is not attached.
2 Replace hard drive data cable.
3 Replace hard drive.
4 Replace logic board. Retain customer’s SIMMs.
1 Verify SCSI device switch setting on external device.
2 Replace terminator on external device.
3 Verify that terminator is installed on internal hard drive.
4 Replace hard drive select cable.
Troubleshooting Symptom Charts/Miscellaneous - 12
Miscellaneous
Clicking, chirping,
or thumping sound
Smoke/odor 1 Replace power supply.
No video, no audio, and
no drive operation
1 Verify analog board cable is connected at J12 on logic board.
2 Replace power supply.
3 Replace analog board.
4 Replace logic board. Retain customer’s SIMMs.
2 Replace analog board.
1 Connect power cord.
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
“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
and black vertical
line are displayed;
screeching sound
1 Verify that three-pin jumper on logic board is configured
correctly for system RAM. See Hardware/Memory.
2 Replace logic board. Retain customer’s SIMMs.
(Continued)
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T ak e Apart
Macintosh SE
Take Apart Cover - 1
Cover
Cover
No preliminary steps are
required before you begin
this procedure.
±
Warning:
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).
This product
Take Apart Cover - 2
2 Using a Torx
screwdriver, remove
the four case screws and
separate the cover from
the chassis with a pullapart 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.
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