This manual includes
complete repair procedures
for the Macintosh Color
Classic II/Performa 275.
Figure: Color Classic II/Performa 275
Page 4
K
Service Source
Specifications
Macintosh Color Classic II/
Performa 275
Page 5
SpecificationsConfigurations - 1
Configurations
Standard
Options
4 MB RAM, 256K VRAM, 3.5-in. hard drive (many sizes),
internal 1.4 MB floppy drive, user-removable logic board, 9in. color display, built-in speaker and microphone, keyboard,
mouse, ADB and power cables, system software installed on
hard drive (requires System 7.1)
Memory expansion kit
256K VRAM SIMM upgrade
Apple IIe emulation card
LC Ethernet card
Math coprocessor
Anti-glare, anti-static CRT
Page 6
SpecificationsProcessor - 2
Processor
CPU
Coprocessor
Addressing
Motorola 68030 microprocessor
33 MHz
Built-in Paged Memory Management Unit (PMMU)
256-byte instruction and data caches
Socket for optional Motorola 68882 floating-point coprocessor
33 MHz
16-bit data bus
32-bit address bus
16-bit internal registers
Page 7
SpecificationsMemory - 3
Memory
RAM
ROM
PRAM
4 MB of dynamic RAM on board
Expandable to 10 MB (100 ns or faster SIMMs)
Dual SIMM expansion slot (two 30-pin connectors)
Includes RAM disk software
1 MB of main ROM on board; 2 MB maximum of main ROM
256 bytes of clock/calendar/parameter memory
Long-life lithium battery
Page 8
SpecificationsMemory - 4
VRAM
256K of VRAM on board
Expandable to 512K of VRAM with 256K VRAM SIMM (100 ns or
faster VRAM SIMM)
68-pin VRAM SIMM connector
Page 9
SpecificationsDisk Storage - 5
Disk Storage
Floppy Drive
Hard Drive
Internal 1.4 MB Apple SuperDrive
3.5-inch, internal 40, 80, or 160 MB SCSI hard drive
Page 10
SpecificationsI/O Interfaces - 6
I/O Interfaces
Serial
SCSI
Apple Desktop Bus
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 ADB ports; mini DIN-4 connector
Maximum of three ADB devices recommended
Maximum current draw: 500 mA
(Mouse draws 10 mA, keyboard draws 25 mA)
screen
Trinitron CRT
512 pixels by 384 lines; 76 dpi
Adjustable contrast control on front bezel
Page 14
SpecificationsElectrical - 10
Electrical
Line V oltage
Frequency
Maximum Power
90–240 VAC; Universal power supply
47–63 Hz, single phase
100 W
Page 15
SpecificationsPhysical - 11
Physical
Dimensions
Weight
Height: 14.5 in. (37.0 cm)
Width: 9.9 in. (25.2 cm)
Depth: 12.6 in. (32.15 cm)
22.5–23.2 lb. (10.2–10.5 kg)
Page 16
SpecificationsEnvironmental - 12
Environmental
Operating
Temperature
Storage
Temperature
Relative Humidity
Altitude
50–104° F (10–40° C)
-40 to 116° F (-40 to 47° C)
20–95% noncondensing
0–15,000 ft. (0–4722 m)
Page 17
K
Service Source
Troubleshooting
Macintosh Color Classic II/
Performa 275
Page 18
TroubleshootingGeneral/ - 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.
Page 19
TroubleshootingSymptom Charts/Video - 2
Symptom Charts
Video
Screen is black, too
dark, or too bright;
audio and drive
operate
Screen is bright and
audio is present, but
no video information
is visible
1Adjust contrast button on front bezel.
2Adjust brightness. Use Brightness Control Panel.
3Check yoke cable connection.
4Perform video adjustments. Refer to “Video” in Adjustments
chapter.
5Replace analog board.
6Replace CRT.
1Perform video adjustments. Refer to “Video” in Adjustments
chapter.
2Replace analog board.
3Replace CRT.
Page 20
TroubleshootingSymptom Charts/Video
(Continued)
- 3
Single vertical or
horizontal line is
displayed
Predominant color
tint or color cannot be
adjusted
Video
1Replace analog board.
2Replace CRT.
1Perform video adjustments. Refer to “Video” in Adjustments
2Replace analog board.
3Replace CRT if red, green, or blue cannot be turned off using
(Continued)
chapter.
appropriate controls.
Page 21
TroubleshootingSymptom Charts/Video
(Continued)
- 4
Picture breaks into
diagonal lines, or
picture rolls
vertically or
horizontally
Out of convergence
(color bleeds from
text or lines)
Black screen spots
(burnt phosphors)
Video
Replace analog board.
1Perform convergence adjustment. Refer to “Convergence” in
2Replace analog board.
3Replace CRT.
Replace CRT.
(Continued)
Adjustments chapter.
Page 22
TroubleshootingSymptom Charts/Video
(Continued)
- 5
Video
Screen jitters or
flashes
Out of focus1Perform focus adjustment. Refer to “Focus” in Adjustments
1Verify that adjacent computer equipment is properly
2Check that all ground cables are secure.
3Replace analog board.
2Replace analog board.
3Replace CRT only if one part of display remains out of focus
(Continued)
grounded. Move electrical devices away from monitor.
Temporarily shut off all fluorescent lights in area.
chapter.
despite adjustment of focus controls to their limits.
Page 23
TroubleshootingSymptom Charts/Video
(Continued)
- 6
Flashing or wavy
screen or monitor
emits high-pitched
noise
Raster size too short/
tall or narrow/wide
Linearity bad (size of
text/graphics differs
at top, bottom, or
sides of screen)
Video
Replace analog board.
1Adjust horizontal or vertical size control. Refer to
2Replace analog board.
Replace analog board.
(Continued)
Adjustments chapter.
Page 24
TroubleshootingSymptom Charts/Video
(Continued)
- 7
Raster tilted or
shifted
Video
1Verify that distortion is not due to environmental conditions
2Perform appropriate geometric adjustments.
3Perform yoke adjustment. Refer to “Yoke” in Adjustments
4Replace analog board.
(Continued)
(move monitor to different location). Refer to “Monitor
Distortion” in Basics chapter of any large-screen monitor
manual.
chapter.
Page 25
TroubleshootingSymptom Charts/Video
(Continued)
- 8
Video
Raster distorted
(barrel-shaped,
corners not square,
stretched or
compressed at top of
display, or sides not
perpendicular)
Raster not centered1Verify that distortion is not due to environmental conditions
1Verify that distortion is not due to environmental conditions
2Perform appropriate geometric adjustments.
3Replace analog board.
4Replace CRT (only in rare instances).
2Adjust horizontal or vertical center control. Refer to
3Replace analog board.
(Continued)
(move monitor to different location). Refer to “Monitor
Distortion” in Basics chapter of any large-screen monitor
manual.
(move monitor to different location). Refer to “Monitor
Distortion” in Basics chapter of any large-screen monitor
manual.
Adjustments chapter.
Page 26
TroubleshootingSymptom Charts/Floppy Drives - 9
Floppy Drives
Audio and video are
present, but internal
floppy drive does not
operate
Disk ejects; display
shows icon with
blinking “X”
1Replace bad disk with known-good disk.
2Replace floppy drive.
3Replace logic board. Retain customer’s SIMMs, math
coprocessor, and PDS card.
4Replace floppy drive cable. See “Flat-Cable Assembly” in
Take Apart.
1Replace bad system disk with known-good system disk.
2Replace floppy drive.
3Replace logic board. Retain customer’s SIMMs, math
coprocessor, and PDS card.
Page 27
TroubleshootingSymptom Charts/Floppy Drives
(Continued)
- 10
Floppy Drives
Unable to insert disk
all the way
Does not eject disk1Insert opened paper clip into hole beside floppy drive.
1To eject previously inserted disk, insert opened paper clip
into hole beside floppy drive.
2Switch off system and hold mouse button down while
switching system on (to complete eject cycle).
3Replace floppy drive.
2Switch off system and hold mouse button down while
switching system on (to complete eject cycle).
3Replace floppy drive.
(Continued)
Page 28
TroubleshootingSymptom Charts/Floppy Drives
(Continued)
- 11
Internal floppy drive
runs continuously
Floppy Drives
1Replace bad disk with known-good disk.
2Replace floppy drive.
3Replace logic board. Retain customer’s SIMMs, math
coprocessor, and PDS card.
4Replace floppy drive cable. See “Flat-Cable Assembly” in
Take Apart.
(Continued)
Page 29
TroubleshootingSymptom Charts/Hard Drives - 12
Hard Drives
Internal or external
hard drive does not
operate
Works with internal
or external SCSI
device but does not
work with both
1Verify that SCSI loopback card is not attached.
2Verify that internal hard drive has all three terminating
resistor packs on circuit board.
3Verify that external drive is properly terminated.
4Replace hard drive.
5Replace logic board. Retain customer’s SIMMs, math
coprocessor, and PDS card.
6Replace hard drive data cable. See “Flat-Cable Assembly” in
Take Apart.
1Verify that SCSI device ID switch setting on external device
is higher than 0. Also verify that ID switch setting on
external SCSI device does not duplicate ID switch settings on
any other attached external SCSI devices.
2Replace terminator on external SCSI device.
3Replace SCSI select cable.
Page 30
TroubleshootingSymptom Charts/Peripheral - 13
Peripheral
Cursor does not move1Check mouse connection.
2If mouse was connected to keyboard, connect it to rear ADB
port instead. If mouse works, replace keyboard.
3If mouse does not work in any ADB port, replace mouse.
4Replace logic board. Retain customer’s SIMMs, math
coprocessor, and PDS card.
Cursor moves, but
clicking mouse
button has no effect
1Replace mouse.
2Replace logic board. Retain customer’s SIMMs, math
coprocessor, and PDS card.
Page 31
TroubleshootingSymptom Charts/Peripheral
(Continued)
- 14
Cannot double-click
to open application,
disk, or server
No response to any
key on keyboard
Peripheral
1Remove extra system files on hard drive.
2Clear parameter RAM. Hold down <Command> <Option> <P>
<R> keys during system startup but before “Welcome to
Macintosh” appears.
3If mouse was connected to keyboard, connect it to rear 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, math
coprocessor, and PDS card.
1Check keyboard connection to ADB port.
2Replace keyboard cable.
3Replace keyboard.
4Replace logic board. Retain customer’s SIMMs, math
coprocessor, and PDS card.
(Continued)
Page 32
TroubleshootingSymptom Charts/Peripheral
(Continued)
- 15
Known-good
ImageWriter or
ImageWriter II does
not print
Known-good
LaserWriter does not
print
Peripheral
1Make sure that Chooser and Control Panel are set correctly.
2Replace printer driver and system software with known-
1Make sure that Chooser and Control Panel are set correctly.
2Replace printer driver and system software with known-
good.
3Refer to Networking and Communications manual.
(Continued)
Page 33
TroubleshootingSymptom Charts/Miscellaneous - 16
Miscellaneous
Clicking, chirping,
or thumping sound
Smoke/odorReplace analog board.
No video, no audio, and
no drive operation
1Verify that logic board power cable is connected at J12 on
logic board.
2Replace analog board.
3Replace logic board. Retain customer’s SIMMs, math
coprocessor, and PDS card.
1Connect power cord.
2Switch power on.
3Replace power cord.
4Replace analog board.
5Replace logic board. Retain customer’s SIMMs, math
coprocessor, and PDS card.
Page 34
TroubleshootingSymptom Charts/Miscellaneous
(Continued)
- 17
Miscellaneous
“Sad Macintosh” icon1Replace bad disk with known-good disk.
2Replace RAM SIMMs on logic board.
3Replace logic board. Retain customer’s SIMMs, math
coprocessor, and PDS card.
Screen shows “Sad
Macintosh” icon and
black vertical lines;
screeching sound
1Replace RAM SIMMs on logic board.
2Replace logic board. Retain customer’s SIMMs, math
coprocessor, and PDS card.
(Continued)
Page 35
K
Service Source
T ak e Apart
Macintosh Color Classic II/
Performa 275
Page 36
Take ApartLogic Board - 1
Logic Board
No preliminary steps are
required before you begin
this procedure.
Logic Board
Caution:
precautions: use a grounded
workbench pad, and always
wear a grounding
wriststrap.
Follow proper ESD
Page 37
Take ApartLogic Board - 2
1If necessary, remove
the two security screws
from the I/O door.
2Push down the two
latches until the I/O door
snaps open. Remove the
door from the rear
housing.
I/O Door
Page 38
Take ApartLogic Board - 3
3Grasp the logic board
firmly with both hands
and pull it straight out of
the chassis. Place the
logic board on a grounded
workbench pad.
Logic Board
Page 39
Take ApartLogic Board - 4
Replacement Note:
are replacing a defective
logic board, remove the RAM
and VRAM SIMMs (if
installed), 68882 math
coprocessor, and PDS card.
Install these components on
the replacement logic board.
Replacement Caution:
reconnecting the logic board,
make sure there are no bent
metal tabs on the chassis
that could contact the
bottom of the logic board and
short out the board.
If you
After
Page 40
Take ApartRear Housing - 5
Rear Housing
Rear Housing
No preliminary steps are
required before you begin
this procedure.
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent injury, review
CRT safety and discharge
instructions in Bulletins/
Safety.
This product
Page 41
Take ApartRear Housing - 6
1Using a long-handled
Torx screwdriver,
remove the four case
screws. If necessary,
remove the two security
screws from the I/O
door.
2Using a case spreader
(pull-apart tool),
separate the housing
from the chassis.
Carefully lift the rear
housing and set it aside.
Page 42
Take ApartRear Housing - 7
±
Warning:
the metal chassis may be
sharp. When moving the
computer with the rear
housing off, be sure to
handle the chassis carefully.
The edges of
Replacement Note:
are replacing a damaged rear
housing, first remove the
fan (see the “Fan” topic in
this chapter).
If you
Page 43
Take ApartAnalog Board - 8
Analog Board
Before you begin,
• Remove the rear housing
• Discharge the CRT
• Remove the anode cap
±
Analog Board
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent injury, review
CRT safety and discharge
instructions in Bulletins/
Safety.
±
Warning:
grounding wriststrap until
after discharging the CRT.
This product
Never use a
Page 44
Take ApartAnalog Board - 9
1Unhook the video board
ground wire from the
CRT grounding strap.
Ground Wire
Replacement Caution:
When
replacing the analog board,
be sure to securely
reconnect the ground wire to
the CRT grounding strap.
Switching on system power
without reconnecting the
ground strap could damage
components.
Page 45
Take ApartAnalog Board - 10
2
Note:
If sealant holds
the video board in place,
cut the sealant with an
art knife.
Carefully pull the video
board straight off the
Video
Board
neck of the CRT.
Page 46
Take ApartAnalog Board - 11
3Using a flat-blade
screwdriver, release the
Degauss Cable
connector latch and
disconnect the degauss
cable from analog board
connector BP2.
Microphone Cable
4Disconnect the yoke
cable from analog board
connector BD1.
5Disconnect the two
halves of the microphone
Yoke Cable
cable.
Page 47
Take ApartAnalog Board - 12
6
Note:
When removing
the analog board in this
step, be careful not to
damage the speaker cable
that is connected
beneath the analog board.
Pull out the analog
board approximately two
inches and align the edge
of the board with
cutouts in the plastic
Chassis
guide.
7Lift out the analog board
Analog
Board
and place it on the
workbench pad.
Page 48
Take ApartAnalog Board - 13
8Disconnect the two
halves of the speaker
cable that are located
beneath the analog board.
9Place the analog board on
a grounded workbench
Speaker Cable
pad.
Page 49
Take ApartSpeaker - 14
Speaker
Before you begin,
• Remove the rear housing
• Discharge the CRT
• Remove the anode cap
• Remove the analog board
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent injury, review
CRT safety and discharge
instructions in Bulletins/
Safety.
Speaker
This product
Page 50
Take ApartSpeaker - 15
±
Warning:
grounding wriststrap until
after discharging the CRT.
Remove the speaker from
the two hook loop fasteners
on the chassis.
Speaker
Never use a
Page 51
Take ApartFloppy Drive - 16
Floppy Drive
Before you begin,
• Remove the rear housing
• Discharge the CRT
• Remove the anode cap
• Remove the analog board
• Remove the speaker
±
Floppy Drive
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent injury, review
CRT safety and discharge
instructions in Bulletins/
Safety.
This product
Page 52
Take ApartFloppy Drive - 17
±
Floppy Drive
Floppy Drive
Cable
Warning:
grounding wriststrap until
after discharging the CRT.
1Disconnect the floppy
drive cable and push it
through the hole in the
plastic chassis.
2Depress the mounting
tab and pull the floppy
drive straight out of the
chassis mounting
channel.
Note:
may catch beneath the
front of the drive
mount. If this happens,
tug the drive straight
Never use a
The mounting tab
Page 53
Take ApartFloppy Drive - 18
back and it will pop over
the tab.
Shield
Plastic Carrier
Replacement Note:
If you
are replacing a defective
floppy drive, remove the
four carrier mounting
screws and separate the
drive from the plastic
carrier. Remove the shield
from the drive mechanism.
Page 54
Take ApartHard Drive - 19
Hard Drive
Before you begin,
• Remove the rear housing
• Discharge the CRT
• Remove the anode cap
• Remove the analog board
Hard Drive
±
Warning:
contains high voltage and a
high-vacuum picture tube.
Hard Drive
To prevent injury, review
Power Cable
CRT safety and discharge
instructions in Bulletins/
Safety.
This product
Page 55
Take ApartHard Drive - 20
±
Hard Drive
Data Cable
Hard Drive
Warning:
grounding wriststrap until
after discharging the CRT.
1Disconnect the hard
drive data and hard drive
power cables.
2Push the cables through
the hole in the plastic
chassis.
Never use a
Page 56
Take ApartHard Drive - 21
3Raise the mounting tab
and pull the hard drive
straight out of the
chassis mounting
channel.
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
Page 57
Take ApartChassis - 22
Chassis
Chassis
Before you begin,
• Remove the rear housing
• Discharge the CRT
• Remove the anode cap
• Remove the analog board
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent injury, review
CRT safety and discharge
instructions in Bulletins/
Safety.
This product
Page 58
Take ApartChassis - 23
±
Bezel
Chassis
Warning:
grounding wriststrap until
after discharging the CRT.
1Open the two release tabs
on one side of the chassis
and raise that side of the
chassis.
2To keep the side of the
chassis raised, insert a
small flat-blade
screwdriver between the
chassis and the bezel.
Never use a
Page 59
Take ApartChassis - 24
3Using a small flat-blade
screwdriver, pry open
the two release tabs on
the other side of the
chassis and raise the
chassis.
4Lift the chassis straight
Chassis
out of the bezel.
Replacement Note:
If you
are replacing a damaged
chassis, first remove the
speaker, floppy drive, hard
drive, logic board, pushbutton board, and flat-cable
assembly. Refer to the
appropriate topics in this
chapter.
Page 60
Take ApartPushbutton Board - 25
Pushbutton Board
Before you begin,
• Remove the rear housing
• Discharge the CRT
• Remove the anode cap
• Remove the analog board
• Remove the chassis
±
Pushbutton Board
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent injury, review
CRT safety and discharge
instructions in Bulletins/
Safety.
±
Warning:
This product
Never use a
Page 61
Take ApartPushbutton Board - 26
grounding wriststrap until
after discharging the CRT.
1Raise and push out the
mounting tabs along
both sides of the bottom
shield.
Chassis
2Remove the bottom
shield from the chassis.
3Set the shield aside.
Mounting
Tabs
Cable
Metal
Tabs
Bottom Shield
Replacement Caution:
replacing the bottom shield
on the chassis, make sure
none of the metal tabs along
the bottom (rear) edge of
the shield is bent up (toward
the logic board). Bent tabs
When
Page 62
Take ApartPushbutton Board - 27
could contact and short out
the logic board.
4Using a T-8 Torx
driver, remove the two
screws that secure the
pushbutton board to the
Push-Button Board
chassis.
5Disconnect the push-
button board from the
cable connector.
Connector
Replacement Note:
Reconnect the cable to the
pushbutton board before
reinstalling the board on
the chassis.
Page 63
Take ApartFlat-Cable Assembly - 28
Flat-Cable
Assembly
Before you begin,
• Remove the rear housing
• Discharge the CRT
• Remove the anode cap
• Remove the analog board
• Remove the chassis
• Remove the logic board
• Remove the speaker
• Remove the floppy drive
• Remove the hard drive
• Remove the pushbutton
Flat-Cable
Assembly
board
Page 64
Take ApartFlat-Cable Assembly - 29
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent injury, review
CRT safety and discharge
instructions in Bulletins/
Safety.
This product
Small
Connector
Bridge
Analog
Board
Cables
1Release the plastic latch
and remove the small
connector bridge (to the
analog board) from the
chassis.
2Turn over the chassis.
3Push the analog board
cables and small
connector bridge
Page 65
Take ApartFlat-Cable Assembly - 30
through the access hole
in the chassis.
4Release the three plastic
latches and remove the
large connector bridge
Large Connector
Bridge
(to the logic board) from
the chassis.
5Remove the drive cables
from the plastic cable
retainers, and remove
the flat-cable assembly.
Replacement Note:
The
plastic cable retainers on
the chassis fit the width of
the drive cables.
Page 66
Take ApartMicrophone Assembly - 31
Microphone
Assembly
Before you begin,
• Remove the rear housing
• Discharge the CRT
• Remove the anode cap
±Warning: This product
contains high voltage and a
high-vacuum picture tube.
To prevent injury, review
CRT safety and discharge
instructions in Bulletins/
Safety.
Microphone
Assembly
Page 67
Take ApartMicrophone Assembly - 32
±Warning: Never use a
grounding wriststrap until
after discharging the CRT.
1Disconnect the
microphone cable
between the microphone
and the analog board.
Microphone Cable
2If necessary, cut the tie-
wrap that secures the
microphone cable to the
degauss coil.
Page 68
Take ApartMicrophone Assembly - 33
Microphone Assembly
3Open the two plastic
latches and remove the
microphone assembly
from the bezel.
Replacement Note: You may
need to use a flat-blade
screwdriver to press the
microphone gasket back into
the chassis.
Bezel
Page 69
Take ApartCRT - 34
CRT
Before you begin,
• Remove the rear housing
• Discharge the CRT
• Remove the anode cap
• Remove the analog board
CRT
• Disconnect the
microphone cable
±Warning: This product
contains high voltage and a
high-vacuum picture tube.
To prevent injury, review
CRT safety and discharge
instructions in Bulletins/
Safety.
Page 70
Take ApartCRT - 35
±Warning: Never use a
grounding wriststrap until
after discharging the CRT.
1Remove the four self-
threading screws that
secure the CRT to the
bezel.
2±Warning: Never
touch the anode or grasp
the neck of the CRT to
remove it from the
bezel. The neck of the
CRT breaks easily and
the anode may retain
high voltages.
Lift the CRT straight out
of the bezel and place the
Page 71
Take ApartCRT - 36
CRT facedown on the
protective workbench
pad.
±Warning: If you need to
dispose of the CRT, refer to
CRT disposal instructions in
Bulletins/Safety.
Replacement Note: If you
are replacing a defective
CRT, first remove the
degauss coil (see the next
topic).
Page 72
Take ApartDegauss Coil - 37
Degauss Coil
Before you begin,
• Remove the rear housing
• Discharge the CRT
• Remove the anode cap
• Remove the analog board
• Disconnect the
microphone cable
• Remove the CRT
±Warning: This product
contains high voltage and a
high-vacuum picture tube.
To prevent injury, review
Degauss Coil
CRT safety and discharge
instructions in Bulletins/
Safety.
Page 73
Take ApartDegauss Coil - 38
±Warning: Never use a
grounding wriststrap until
after discharging the CRT.
1Remove the degauss coil
Ground Strap
cable from the tie-wrap
at the side of the CRT
yoke.
2Lift the degauss coil with
attached brackets over
the neck of the CRT.
Replacement Note: When
replacing the degauss coil,
be sure to reattach the
ground strap to the degauss
bracket.
Page 74
Take ApartBezel - 39
Bezel
To remove the bezel,
Bezel
• Remove the rear housing
• Discharge the CRT
• Remove the anode cap
• Remove the analog board
• Remove the chassis
• Remove the microphone
assembly
• Remove the CRT
Page 75
Take ApartFan - 40
Fan
Before you begin, remove
the rear housing.
Fan
Page 76
Take ApartFan - 41
Open the two latches and pull
the fan straight out of the
Rear Housing
Fan
rear housing.
Page 77
K
Service Source
Upgrades
Macintosh Color Classic II/
Performa 275
Page 78
UpgradesVRAM Upgrade - 1
VRAM Upgrade
VRAM SIMM
Before you begin, remove
the logic board.
Caution:
precautions in Bulletins/
Safety.
Review the ESD
Page 79
UpgradesVRAM Upgrade - 2
Note:
The Color Classic II/
Performa 275 has 256K of
video RAM (VRAM) soldered
on the logic board. You can
increase the amount of VRAM
to 512K by installing a
256K VRAM SIMM in the
SIMM slot (connector J9).
Use only 100 ns or faster
VRAM SIMMs.
Page 80
UpgradesVRAM Upgrade - 3
1Grasp the VRAM SIMM
by its edges with the
contacts pointing down.
J9 SIMM Slot
Insert the SIMM at an
angle into SIMM slot J9.
2Push back on the SIMM
VRAM SIMM
until it snaps into place.
Page 81
UpgradesMath Coprocessor - 4
Math Coprocessor
Before you begin, remove
the logic board.
Math
Coprocessor
Caution:
precautions in Bulletins/
Safety.
You can add a Motorola
68882 math coprocessor to
the logic board in the Color
Classic II/Performa 275,
thereby increasing overall
system performance.
Review the ESD
Page 82
UpgradesMath Coprocessor - 5
1Position the math
Math Coprocessor
J13 Connector
coprocessor over socket
U9 with the beveled edge
of the chip toward the
large contact connector
(J13) at the front of the
board.
2Align the pins in the
socket and gently press
down the chip.
Beveled
Edge
Page 83
UpgradesMemory Upgrade - 6
Memory Upgrade
RAM SIMMs
Before you begin, remove
the logic board.
Caution:
precautions in Bulletins/
Safety.
Note:
Performa 275 has 4 MB of
RAM soldered on the logic
board which can be
expanded to 10 MB of RAM.
The Color Classic II/
Performa 275 includes one
SIMM expansion slot with
two 30-pin connectors. The
Review the ESD
The Color Classic II/
Page 84
UpgradesMemory Upgrade - 7
system requires 100 ns or
faster RAM SIMMs. For
additional information,
refer to Hardware/Memory.
1
Note:
Both connectors in
the J10 SIMM slot must
RAM SIMM
be filled or both must be
empty; you cannot
install a SIMM into just
one of the two slots.
Grasp the RAM SIMMs by
the edges with the
contacts pointing down.
Insert the SIMMs at an
J10 SIMM Connectors
angle into the J10
connectors.
Page 85
UpgradesMemory Upgrade - 8
2Push back on the SIMMs
until they snap into
place.
Page 86
UpgradesPDS Upgrades - 9
PDS Upgrades
Before you begin, remove
the logic board.
Note:
The 96-pin processor
direct slot in the Color
Classic II/Performa 275 is
compatible with the PDS slot
in the Macintosh LC.
Currently Apple offers two
PDS expansion cards for the
Macintosh LC and Color
Classic series: the Apple IIe
emulation card and the LC
Ethernet card.
PDS Card
Page 87
UpgradesPDS Upgrades - 10
Rear Housing
Lock Plate
Caution:
Review the ESD
precautions in Bulletins/
Safety.
1Squeeze together the
latches and pull the lock
plate off the inside of the
access cover.
2Remove the access cover
from the rear housing.
Page 88
UpgradesPDS Upgrades - 11
3Connect the expansion
card to the 96-pin PDS
connector (J8) on the
logic board.
J8 PDS Connector
Page 89
K
Service Source
Additional Procedures
Macintosh Color Classic II/
Performa 275
Page 90
Additional ProceduresBattery Verification - 1
Battery
Verification
Before you begin, remove
the logic board.
±
Battery
Warning:
discarded improperly, the
lithium battery in the
computer could explode.
Review battery handling and
disposal instructions in
Bulletins/Safety.
If handled or
Caution:
precautions in Bulletins/
Safety.
Review the ESD
Page 91
Additional ProceduresBattery Verification - 2
1Set the voltmeter to the
10 volts DC scale.
2Hold the positive probe
of the voltmeter to the
positive end of the
Negative
Probe
battery and the negative
probe to the negative
end of the battery.
Positive
Probe
3If the battery voltage is
below 3.0 volts, replace
the battery. Refer to
“Battery Replacement”
in this chapter.
Page 92
Additional ProceduresBattery Replacement - 3
Battery
Replacement
Before you begin, remove
the logic board.
±
Battery
Warning:
discarded improperly, the
lithium battery in the
computer could explode.
Review battery handling and
disposal instructions in
Bulletins/Safety.
If handled or
Caution:
precautions in Bulletins/
Safety.
Review the ESD
Page 93
Additional ProceduresBattery Replacement - 4
1Insert a small flat-
blade screwdriver into
the top of the battery
holder cover and gently
push down and out with
Cover
the screwdriver to
release the tab.
2Repeat on the other end
and remove the cover
Battery
Holder
from the battery holder.
Page 94
Additional ProceduresBattery Replacement - 5
3Grasp the battery and
remove it from the
holder.
4Return the battery to
Apple for proper
disposal. For battery
packaging and labeling
information, refer to the
instructions in
Bulletins/Safety.
Page 95
K
Service Source
Adjustments
Macintosh Color Classic II/
Performa 275
Page 96
AdjustmentsGeometry - 1
Geometry
Before you begin, remove
the rear housing.
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent injury, review
the CRT safety instructions
in Bulletins/Safety.
This product
Adjustment
Controls
Logic Board
Chassis
Adjustment
Controls
Warning:
High Voltage
Areas
Support
Page 97
AdjustmentsGeometry - 2
Note:
The controls on this
monitor require a short
hex-head plastic tool to
make adjustments. If the tool
is long or too thin, it will be
too flexible, which will
make fine adjustments
difficult. Use a short, rigid,
hex-head plastic tool to
minimize flexing.
±
Warning:
metal alignment tools—they
are a shock hazard.
1
Caution:
housing removed, the
metal chassis could short
to the bottom of the logic
Do not use
With the rear
Page 98
AdjustmentsGeometry - 3
board. Before switching
on system power, make
sure the chassis is not
touching the logic board.
All-White Screen
To prevent the bottom of
the chassis from
buckling and touching
the logic board, you may
want to support the rear
corners of the chassis.
Switch on system power.
2Using Display Service
Utility from the Utilities
folder of the MacTest Pro
CD, display the AllWhite Screen test
pattern.
Page 99
AdjustmentsGeometry - 4
Vertical Center
Using a hex-head plastic
adjustment tool, adjust the
All-White Screen
Vertical Center
vertical center control
until the raster is centered
(top to bottom) in the
display area.
Page 100
AdjustmentsGeometry - 5
Horizontal Center
Using a hex-head plastic
adjustment tool, adjust the
All-White Screen
Horizontal
Center
horizontal center control
until the raster is centered
(side to side) in the display
area.
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