Optional internal 40 MB hard drive; optional external SCSI drive
Internal 40 MB or 80 MB hard drive; optional external SCSI
drive
Page 8
SpecificationsI/O Interfaces - 4
I/O Interfaces
Floppy Drive
SCSI
Apple Desktop Bus
Serial
Sound
External drive port; DB-19 connector
One SCSI parallel port; DB-25 connector
One Apple Desktop Bus (ADB) port; mini DIN-4 connector
Two RS-422 serial ports; mini DIN-8 connectors
Dual-channel headphone connector
Connected to the monophonic sound output
Macintosh Classic does not provide true two-channel output
(although stereo jack may be used)
Page 9
SpecificationsI/O Devices - 5
I/O Devices
Keyboard
Mouse
Classic II/Per 200
Microphone
80 keys, with numeric keypad; ADB connector
Mechanical tracking; ADB connector
Electret, omnidirectional; output voltage is 4 mV, peak to peak, at
normal volume
Page 10
SpecificationsSound and Video - 6
Sound and Video
Sound Generator
Classic:
Video Display
Classic II/Per 200:
Four-voice sound with 8-bit digital/analog conversion, using
22-kHz sampling rate
Monophonic, 8-bit digital/analog conversion using 22-kHz
sampling rate; capable of driving stereo headphones or other
stereo equipment through the sound jack
9-in. (diagonal) screen; high-resolution, 512 by 342 pixel,
bit-mapped, monochrome display
Page 11
SpecificationsElectrical - 7
Electrical
Line V oltage
Frequency
Maximum Power
100–120 V AC
47–63 Hz, single phase
100 W
Page 12
SpecificationsPhysical - 8
Physical
Dimensions
Weight
Height: 13.2 in. (33.6 cm)
Width: 9.7 in. (24.6 cm)
Depth: 11.2 in. (28.5 cm)
16–17.1 lb. (7.3-7.8 kg) not including internal hard drive
Page 13
K
Service Source
Troubleshooting
Macintosh Classic/Classic II/
Performa 200
Page 14
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 15
TroubleshootingSymptom 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
1Replace bad disk with known-good system disk.
2Replace floppy drive.
3Replace logic board. Retain customer’s SIMMs.
Page 20
TroubleshootingSymptom Charts/Floppy Drives
(Continued)
- 7
Floppy Drives
Unable to insert disk
all the way
Does not eject disk1Insert opened paper clip into hole beside floppy drive.
Internal floppy drive
runs continuously
1Insert 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.
1Replace bad disk with known-good disk.
2Replace floppy drive.
3Replace logic board. Retain customer’s SIMMs.
4Replace floppy drive cable.
(Continued)
Page 21
TroubleshootingSymptom Charts/Hard Drives - 8
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.
2Check that internal SCSI terminator is positioned in
connector properly.
3Verify that internal hard drive has all three terminating
resistor packs on circuit board.
4Replace hard drive data cable.
5Replace hard drive.
6Replace logic board. Retain customer’s SIMMs.
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.
3Verify that terminator is installed on internal SCSI drive.
4Replace SCSI select cable.
Page 22
TroubleshootingSymptom Charts/Peripheral - 9
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.
Cursor moves, but
clicking the mouse
button has no effect
1Connect power cord.
2Switch power on.
3Replace power cord.
4Replace fuse.
5Replace power/sweep board.
6Replace logic board. Retain customer’s SIMMs.
Page 26
TroubleshootingSymptom Charts/Miscellaneous
(Continued)
- 13
Miscellaneous
“Sad Macintosh” icon1Replace bad disk with known-good disk.
2Verify that jumper on memory expansion board is configured
correctly for “SIMMs” or “No SIMMs.” (See “Memory
Upgrade” in Additional Procedures.)
3On 4 MB Macintosh Classic, confirm SIMMs used are eight-
chip SIMMs. (See Memory manual.) Any 1 MB SIMMs with
fewer than eight chips won’t work in the Macintosh Classic.
4On Macintosh Classic, replace optional memory expansion
board; on Macintosh Classic II/Performa 200, replace
optional SIMMs in two SIMMs slots on logic board.
5Replace logic board. Retain customer’s SIMMs.
(Continued)
Page 27
TroubleshootingSymptom Charts/Miscellaneous
(Continued)
- 14
Screen shows “Sad
Macintosh” icon and
black vertical lines;
screeching sound
Miscellaneous
1Verify that jumper on memory expansion board is configured
correctly for “SIMMs” or “No SIMMs.” (See “Memory
Upgrade” in Upgrades.)
2On 4 MB Macintosh Classic, confirm SIMMs used are eight-
chip SIMMs. (See Memory manual.) Any 1 MB SIMMs with
fewer than eight chips won’t work in the Macintosh Classic.
3On Macintosh Classic, replace optional memory expansion
board; on Macintosh Classic II/Performa 200, replace
optional SIMMs in two SIMMs slots on logic board.
4Replace logic board. Retain customer’s SIMMs.
(Continued)
Page 28
TroubleshootingSymptom Charts/Miscellaneous
(Continued)
- 15
Miscellaneous
No power1Connect power cord.
2Switch power on.
3Replace power cord.
4Replace fuse.
5Replace power/sweep board.
6Replace logic board. Retain customer’s SIMMs.
(Continued)
Page 29
K
Service Source
T ak e Apart
Macintosh Classic/Classic II/
Performa 200
Page 30
Take ApartCover - 1
Cover
No preliminary steps are
required before you begin
this procedure.
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious personal
injury or equipment
damage, review CRT safety
and discharge instructions
in Bulletins/Safety.
This product
Page 31
Take ApartCover - 2
1Using a Torx
screwdriver, remove
the four case screws.
Using a case spreader or
pull-apart tool,
separate the cover from
the chassis.
2Carefully lift the cover
and set it aside.
±
Warning:
the metal chassis may be
sharp. When moving the
computer with the cover off,
be sure to handle the chassis
carefully.
The edges of
Page 32
Take ApartCover - 3
Note:
When replacing the
cover, be sure to install the
two black case screws in the
bottom of the cover and the
two silver-colored case
screws in the top of the
cover.
Page 33
Take ApartPower/Sweep Board - 4
Power/Sweep
Board
Before you begin:
• Remove the cover
• Discharge the CRT
• Remove the anode cap
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious personal
injury or equipment
damage, review CRT safety
and discharge instructions
in Bulletins/Safety.
This product
Caution:
To prevent ESD
Page 34
Take ApartPower/Sweep Board - 5
damage to components, wear
a grounding wriststrap.
Never use a grounding
wriststrap until after
discharging the CRT.
Page 35
Take ApartPower/Sweep Board - 6
1Using a Torx
screwdriver, remove
the screw that secures
the ground wire to the
upper corner of the CRT.
2Carefully pull off the
video board from the
neck of the CRT.
Note:
If sealant holds
the board in place, cut
the sealant with an art
knife.
Page 36
Take ApartPower/Sweep Board - 7
3Remove the logic board
power cable from the
logic board. Remove the
Phillips screws that
secure the power/sweep
bracket to the chassis
and pull the board
slightly away from the
chassis.
Note:
Most power/sweep
brackets are secured by
two screws; however,
some are secured by
three.
Page 37
Take ApartPower/Sweep Board - 8
5 Remove the following
cable connectors from
the power/sweep board:
• Yoke cable
• Fan cable
• Hard drive power
cable (if present)
Page 38
Take ApartPower/Sweep Board - 9
6Lift the board free.
Page 39
Take ApartPower/Sweep Board - 10
Note:
The two versions of
the power/sweep board,
Rev A and Rev B, are
functionally equivalent, but
they are not
interchangeable.
In addition, a Rev A power/
sweep board must be used
with a Rev A CRT yoke
assembly and a Rev A or Rev
B cover. A Rev B power/
sweep board must be used
with a Rev B CRT yoke
assembly and a Rev B cover.
Page 40
Take ApartPower/Sweep Board - 11
To identify compatible
versions of the power/sweep
board, CRT assembly, and
cover, examine the CRT yoke
connector. Power/sweep
board Rev A has plastic
sleeves surrounding the
prongs; the prongs are
exposed on power/sweep
board Rev B.
Page 41
Take ApartLogic Board - 12
Logic Board
Before you begin:
• Remove the cover
• Discharge the CRT
• Remove the memory
expansion board
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious personal
injury or equipment
damage, review CRT safety
and discharge instructions
in Bulletins/Safety.
This product
Page 42
Take ApartLogic Board - 13
Caution:
damage to components, wear
a grounding wriststrap.
Never use a grounding
wriststrap until after
discharging the CRT.
To prevent ESD
Page 43
Take ApartLogic Board - 14
1Remove the following
cable connectors from
the logic board:
• Logic board power
cable
• Floppy drive cable
• Hard drive data
cable (if present)
Hard Drive
Data Cable
Floppy Drive Cable
Page 44
Take ApartLogic Board - 15
2Grasp the logic board by
the corners and slide it
straight up and out of the
chassis.
Replacement Note:
the SIMMs from the
defective logic board and
install them in the
replacement logic board.
(See Memory manual.)
Remove
Page 45
Take ApartHard Drive - 16
Hard Drive
Before you begin:
• Remove the cover
• Discharge the CRT
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious personal
injury or equipment
damage, review CRT safety
and discharge instructions
in Bulletins/Safety.
This product
Page 46
Take ApartHard Drive - 17
Caution:
damage to components, wear
a grounding wriststrap.
Never use a grounding
wriststrap until after
discharging the CRT.
To prevent ESD
Page 47
Take ApartHard Drive - 18
1Disconnect the hard
drive data cable from the
logic board.
2Disconnect the hard
drive power cable from
the power/sweep board.
Hard Drive
Power Cable
Logic Board
Hard Drive
Data Cable
Page 48
Take ApartHard Drive - 19
3Remove the two Phillips
screws that secure the
hard drive housing to the
floppy drive housing and
lift out the hard drive
assembly.
Replacement Note:
are removing a hard drive
from the system but not
installing a new one, install
a SCSI terminator on the
logic board SCSI connector.
To insert the terminator,
line up the white key icon
with the notch in the cable
connector.
If you
Page 49
Take ApartHard Drive - 20
Replacement Note:
information on removing the
hard drive from the carrier
and returning drives,
cables, and carriers to
Apple, refer to Hardware/
Service Manuals/ SCSI Hard
Drives Manual.
For
Page 50
Take ApartFloppy Drive - 21
Floppy Drive
Before you begin:
• Remove the cover
• Discharge the CRT
• Remove the hard drive
• Remove the logic board
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious personal
injury or equipment
damage, review CRT safety
and discharge instructions
in Bulletins/Safety.
This product
Caution:
To prevent ESD
Page 51
Take ApartFloppy Drive - 22
damage to components, wear
a grounding wriststrap.
Never use a grounding
wriststrap until after
discharging the CRT.
Page 52
Take ApartFloppy Drive - 23
1Remove the four Phillips
screws that secure the
floppy drive housing to
the bottom of the chassis.
Page 53
Take ApartFloppy Drive - 24
2Lift out the floppy drive
mechanism.
Replacement Note:
you install a replacement
1.4 MB SuperDrive, you
must remove the dust shield.
Before
Page 54
Take ApartFan - 25
Fan
Before you begin:
• Remove the cover
• Discharge the CRT
• Remove the anode cap
• Remove the power/sweep
board
±
Fan
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious personal
injury or equipment
damage, review CRT safety
and discharge instructions
in Bulletins/Safety.
This product
Page 55
Take ApartFan - 26
Caution:
damage to components, wear
a grounding wriststrap.
Never use a grounding
wriststrap until after
discharging the CRT.
To prevent ESD
Page 56
Take ApartFan - 27
1Using a small, stump-
handled Phillips
screwdriver, remove
the two screws that
mount the fan to the
chassis.
2Lift out the fan.
Page 57
Take ApartCRT - 28
CRT
Before you begin:
• Remove the cover
• Discharge the CRT
• Remove the anode cap
• Remove the power/sweep
board
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious personal
injury or equipment
damage, review CRT safety
and discharge instructions
in Bulletins/Safety.
This product
Page 58
Take ApartCRT - 29
Caution:
damage to components, wear
a grounding wriststrap.
Never use a grounding
wriststrap until after
discharging the CRT.
To prevent ESD
Page 59
Take ApartCRT - 30
1Remove the three Torx
screws from the
corners of the CRT.
2Carefully lift the CRT
free from the bezel.
Note:
The CRT yoke
assembly must be
compatible with the power/
sweep assembly, which is
available in two versions,
Rev A and Rev B. CRT yoke
assembly Rev A requires
power/sweep board Rev A.
CRT yoke assembly Rev B
requires power/sweep
board Rev B.
Page 60
Take ApartCRT - 31
Refer to “Power/Sweep
Board” in Take Apart to
identify CRT and power/
sweep revisions and to
verify compatibility.
Page 61
Take ApartChassis & Front Bezel - 32
Chassis & Front
Bezel
Before you begin:
• Remove the cover
• Discharge the CRT
• Remove the anode cap
• Remove the power/sweep
board
• Remove the memory
expansion board
• Remove the logic board
• Remove the hard drive
• Remove the floppy drive
• Remove the fan
Page 62
Take ApartChassis & Front Bezel - 33
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious personal
injury or equipment
damage, review CRT safety
and discharge instructions
in Bulletins/Safety.
This product
Page 63
Take ApartChassis & Front Bezel - 34
1Remove the four Torx
screws from the front
bezel.
2Lift out the metal
chassis.
Page 64
Take ApartChassis & Front Bezel - 35
3Remove the three Torx
screws from the corner
of the CRT, and remove
the CRT.
Page 65
Take ApartFuse - 36
Fuse
Before you begin:
• Remove the cover
• Discharge the CRT
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious personal
injury or equipment
damage, review CRT safety
and discharge instructions
in Bulletins/Safety.
This product
Page 66
Take ApartFuse - 37
Caution:
damage to components, wear
a grounding wriststrap.
Never use a grounding
wriststrap until after
discharging the CRT.
Using a fuse puller or small
flat-blade screwdriver,
carefully remove the fuse
from its holder.
To prevent ESD
Page 67
K
Service Source
Upgrades
Macintosh Classic/Classic II/
Performa 200
Page 68
UpgradesMemory Exp. Bd. - 1
Memory Exp. Bd.
Before you begin:
• Remove the cover
• Discharge the CRT
±
Memory Expansion
Board
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious personal
injury or equipment
damage, review CRT safety
and discharge instructions
in Bulletins/Safety.
This product
Page 69
UpgradesMemory Exp. Bd. - 2
Caution:
damage to components, wear
a grounding wriststrap.
Never use a grounding
wriststrap until after
discharging the CRT.
To prevent ESD
Page 70
UpgradesMemory Exp. Bd. - 3
Note:
The memory
expansion board is an option
for the Macintosh Classic
only. It contains 1 MB of
soldered RAM plus one pair
of SIMM connectors.
Carefully slide the memory
expansion board up to free it
from the logic board and the
chassis.
Page 71
UpgradesMemory Upgrade - 4
Memory Upgrade
Before you begin:
• Remove the cover
• Discharge the CRT
• Remove the memory
expansion board
±
Memory Expansion
Board
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious personal
injury or equipment
damage, review CRT safety
and discharge instructions
in Bulletins/Safety.
This product
Page 72
UpgradesMemory Upgrade - 5
Caution:
damage to components, wear
a grounding wriststrap.
Never use a grounding
wriststrap until after
discharging the CRT.
To prevent ESD
Page 73
UpgradesMemory Upgrade - 6
Note:
The memory
expansion board is an option
for the Macintosh Classic
only. It contains 1 MB of
soldered RAM plus one pair
of SIMM connectors. You can
SIMM Connectors
upgrade the system further
by adding two 256K or two 1
MB SIMMs to the memory
expansion board and moving
the jumper. You must use
120-ns (or faster) SIMMs.
Jumper
1 MB soldered RAM
Page 74
UpgradesMemory Upgrade - 7
Note:
Install the memory
board without additional
SIMMs for a 1 MB RAM
upgrade. Install two 256K
SIMMs onto the memory
expansion board for a 2.5
SIMM Connectors
MB RAM upgrade or two 1
MB SIMMs for a 4 MB RAM
upgrade.
1Install the SIMMs in the
SIMM slots on the
Jumper
memory expansion
board.
2Position the jumper as
1 MB soldered RAM
shown.
Page 75
UpgradesClassic II Upgrade - 8
Classic II Upgrade
Before you begin:
• Remove the cover
• Discharge the CRT
• Remove the logic board
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious personal
injury or equipment
damage, review CRT safety
and discharge instructions
in Bulletins/Safety.
This product
Caution:
damage to components, wear
To prevent ESD
Page 76
UpgradesClassic II Upgrade - 9
a grounding wriststrap.
Never use a grounding
wriststrap until after
discharging the CRT.
Page 77
UpgradesClassic II Upgrade - 10
Note:
A Macintosh Classic II
upgrade kit upgrades a
Macintosh Classic to a
Macintosh Classic II. The
upgrade kit includes a
Classic II logic board, a
Classic II cover, a
microphone, and an
accessory kit.
Page 78
UpgradesClassic II Upgrade - 11
Caution:
connections to the sound
output and sound input
ports are correct. Inserting
the wrong equipment into
the wrong port could damage
the Macintosh Classic II or
external equipment.
1Install the Macintosh
Take care that the
Classic II logic board.
Page 79
UpgradesClassic II Upgrade - 12
Serial Number
2Install the Classic II
cover.
3Read the customer’s
original serial number
from the label on the
back of the old rear
housing and record the
number with indelible
ink or engrave it onto
the new rear housing.
Page 80
K
Service Source
Additional Procedures
Macintosh Classic/Classic II/
Performa 200
Page 81
Additional ProceduresBattery Verification - 1
Battery
Verification
Before you begin:
• Remove the cover
• Discharge the CRT
• Remove the logic board
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious personal
injury or equipment
damage, review CRT safety
and discharge instructions
in Bulletins/Safety.
This product
Caution:
To prevent ESD
Page 82
Additional ProceduresBattery Verification - 2
damage to components, wear
a grounding wriststrap.
Never use a grounding
wriststrap until after
discharging the CRT.
Page 83
Additional ProceduresBattery Verification - 3
±
Warning:
discarded improperly, the
lithium battery in the
computer could explode.
Review battery handling and
disposal instructions in
Bulletins/Safety.
1Set the voltmeter range
to the10 volts DC scale.
2Hold the positive probe
of the voltmeter to the
positive “+” side of the
battery. Hold the ground
probe of the voltmeter to
the negative (-) side of
the battery.
If handled or
Page 84
Additional ProceduresBattery Verification - 4
3If the battery voltage is
below 3.0 volts, replace
the battery. See
“Battery Replacement”
in this chapter.
Page 85
Additional ProceduresBattery Replacement - 5
Battery
Replacement
Before you begin:
• Remove the cover
• Discharge the CRT
• Remove the logic board
±
Warning:
contains high voltage and a
high-vacuum picture tube.
To prevent serious personal
injury or equipment
damage, review CRT safety
and discharge instructions
in Bulletins/Safety.
This product
Page 86
Additional ProceduresBattery Replacement - 6
Caution:
damage to components, wear
a grounding wriststrap.
Never use a grounding
wriststrap until after
discharging the CRT.
To prevent ESD
Page 87
Additional ProceduresBattery Replacement - 7
±
Warning:
discarded improperly, the
lithium battery in the
computer could explode.
Review battery handling and
disposal instructions in
Bulletins/Safety.
1Pull the old battery out
of the battery holder.
2Replacement Note:
Orient the new battery
so that the end marked
“+” matches the “+” on
the logic board, and
insert the battery into
the battery holder.
If handled or
Page 88
Additional ProceduresBattery Replacement - 8
Note:
For information about
properly disposing of the old
battery, refer to battery
disposal instructions in
Bulletins/Safety.
Page 89
K
Service Source
Adjustments
Macintosh Classic/Classic II/
Performa 200
Page 90
AdjustmentsLight Meter Setup - 1
Light Meter Setup
This topic covers setup for
three light meter models:
R77, L-248, and 246.
Model R77 (Apple part
number 076-0310) is the
newest model available.
Model R77
The R77 light meter is
capable of reading luminance
from 10 to 1,000
footcandles (fc).
Before you begin, remove
the 10X multiplier plate
Page 91
AdjustmentsLight Meter Setup - 2
from the lens.
Three scales are shown on
the light meter:
• 200-1000 fc
• 50-250 fc
• 10-50 fc
Because display screen
luminance typically ranges
from 10 to 50 fc, take
readings from the bottom
scale only.
Page 92
AdjustmentsLight Meter Setup - 3
To measure a display
screen’s luminance,
1Set the scale switch to
the bottom position (to
set up the 10-50 fc
scale).
2Place the lens against the
middle of the screen and
read the bottom scale.
Note:
When the light meter
is not in use, slide the scale
switch to its top position,
and store the meter in its
protective case.
Important:
light meter is giving false
If you suspect the
Page 93
AdjustmentsLight Meter Setup - 4
readings, verify the
readings with a known-good
light meter or photometer.
Also check the age of the R77
light meter by its four-digit
manufacturing date stamp
(such as 0398 for March
1998).
Caution:
meter can permanently
damage its accuracy. A
shock-damaged meter might
read incorrectly or its
pointer may not drop to
zero.
Dropping the
Page 94
AdjustmentsLight Meter Setup - 5
Side
Switch
Scale
Lens
Read
Button
Red Area
Model L-248
1Press the red button on
the back of the light
meter. If the reading is
out of the red area,
replace the battery.
2Move the side switch to
its lower position so that
the scale reads 2 through
10.
3Uncover the lens of the
meter.
4Place the lens against the
middle of the screen and
press the read button to
read the scale.
Page 95
AdjustmentsLight Meter Setup - 6
Model 246
1Remove the metal slide,
Lens
if installed, from the
top of the light meter.
Swivel Head
Scale
2Install the white lens
with the red dot.
3Rotate the swivel head
so the lens of the meter
faces the monitor.
4Place the lens against the
middle of the screen and
read the scale.
Page 96
AdjustmentsVideo - 7
Video
Note:
After you replace the
CRT or power/sweep board,
you may need to perform
video adjustments.
1
Caution:
must make adjustments
from the rear of the
computer, position a
mirror to view the
computer screen.
Because you
Page 97
AdjustmentsVideo - 8
2Using a small flat-blade
screwdriver, depress
the center tab and lift
out the service door.
Page 98
AdjustmentsVideo - 9
Brightness & Contrast
Contrast
(PL2)
Brightness
(PL4)
Important:
light meters may differ
between models. Please note
the type of meter you are
using (Model R77, L-248,
or 246) before making an
adjustment. (See “Light
Meter Setup.”)
Note:
has been on for at least 30
minutes.
1Run the Display Service
Utility from the Utilities
folder on the MacTest
Pro CD.
Readings from
Be sure the computer
Page 99
AdjustmentsVideo - 10
2From the pattern
selections screen, select
the Full brightness
screen.
3Hold the light meter
lens against the center of
the screen.
4Using an insulated flat-
blade screwdriver,
adjust the contrast
control until you
measure luminance at
40 foot lamberts (± 3
foot lamberts), which on
the light meter is
• Model R77: 29 on the
bottom scale
Page 100
AdjustmentsVideo - 11
• Model L-248: 10 to
11 on the 10-18 scale
• Model 246: 29 on the
red scale
Important:
light meter tolerance can
vary. If you doubt your
meter’s accuracy,
verify the readings with
a known-good light
meter or photometer.
5Press a key to return to
the pattern selections
screen. Select the Half
brightness screen.
Over time,
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