Apple Modems Service Manual

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Service Source

Modems

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Service Source

T ak e Apart

Modems
Take Apart Apple Data Modem 2400 - 1

Apple Data Modem 2400

No preliminary steps are required before you begin this procedure.
Caution
precautions in Safety/ Bulletins.
Note
explains how to remove the cover, the logic board, and the speaker.
: Review the ESD
: This procedure
Take Apart Apple Data Modem 2400 - 2

Cover

1 Push in the two locking
tabs, and lift the cover
Tab
Tab
until it clears the tabs.
2 Lift the back of the cover
up and forward until the interior latch separates from the case.
Take Apart Apple Data Modem 2400 - 3

Logic Board

Light Pipe Assembly
Speaker Cable
Mounting Screw
Mounting Screw
Volume Lever
You must f
irst remove the
cover.
1 Remove the volume
lever.
2 Remove the light pipe
assembly.
Replacement Caution:
The small, clear tabs on the bottom front of the light pipe assembly fit into the holes in the case. The assembly will break if you force the larger tabs into the holes.
Take Apart Apple Data Modem 2400 - 4
3 Disconnect the speaker
cable.
4 Remove the two
mounting screws.
Light Pipe Assembly
Speaker Cable
Mounting Screw
Mounting Screw
Volume Lever
Take Apart Apple Data Modem 2400 - 5
5 Lift the logic board out of
the bottom case.
Logic Board
Take Apart Apple Data Modem 2400 - 6

Speaker

Speaker
You must f
following:
• Cover
• Logic board
Lift out the speaker.
irst remove the
Take Apart Apple Personal Modem - 7

Apple Personal Modem

No preliminary steps are
Main Body
required before you begin this procedure.
Power Connector Plug Head
Replacement Note
Apple Personal Modem contains two modules—the main body and the power connector plug head. If the main body is defective, return both modules to Apple. If the power connector plug head is defective, swap only the head.
: The
Take Apart Modem 300/Modem 1200 - 8

Modem 300/ Modem 1200

No preliminary steps are required before you begin this procedure.
Caution
precautions in Safety/ Bulletins.
Note
explains how to remove the bottom cover and the modem board.
: Review the ESD
: This procedure
Take Apart Modem 300/Modem 1200 - 9

Bottom Cover

1 Carefully pry the two
rubber feet from the bottom front of the modem.
2 Remove the four
retaining screws and the bottom cover.
Take Apart Modem 300/Modem 1200 - 10

Modem Board

You must first remove the bottom cover.
Lift out the modem board.
Replacement Caution:
are two types of Modem 1200 boards—one that requires a sprayed case and one that does not. Refer to the parts information for the proper part numbers. Do not interchange the two modem boards.
There
Take Apart AppleFax Modem - 11

AppleFax Modem

No preliminary steps are required before you begin this procedure.
Caution
precautions in Safety/ Bulletins.
Note
explains how to remove the cover, auxiliary logic board, main logic board, and speaker.
: Review the ESD
: This procedure
Take Apart AppleFax Modem - 12

Cover

1 Push in the two locking
tabs, and lift the cover until it clears the tabs.
2 Lift the back of the cover
up and forward until the interior latch separates from the case.
Take Apart AppleFax Modem - 13

Auxiliary Logic Board

You must first remove the cover.
1 Carefully lift the ends of
the auxiliary logic board, and remove it from the main logic board connectors.
Replacement Caution
Make sure the auxiliary logic board is correctly aligned before installing it on the main logic board.
:
Take Apart AppleFax Modem - 14

Main Logic Board

Light Pipe Assembly
Volume Lever
Speaker
You must first remove the cover.
1 Remove the volume
lever.
2 Remove the light pipe
assembly.
Replacement Caution:
The small clear tabs on the bottom front of the light pipe assembly fit into the holes in the case. The assembly will break if the larger tabs are forced into the holes.
Take Apart AppleFax Modem - 15
3 Disconnect the speaker
cable.
Light Pipe Assembly
Volume Lever
Speaker
Take Apart AppleFax Modem - 16
4 Remove the two screws.
Mounting Screws
Main Logic Board
5 Lift the main logic board
out of the bottom case.
Take Apart AppleFax Modem - 17

Speaker

You must first remove the following:
Speaker
• Cover
• Main logic board
Lift out the speaker.
K
Service Source

Troubleshooting

Modems
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.)
For additional assistance, contact Apple Technical Support.
Troubleshooting Symptom Charts/Apple Data Modem 2400 - 2

Symptom Charts

Apple Data Modem 2400

Modem lights are not on
Both lights are on or blinking, or yellow light stays on after power on
No sound while modem is operating
1 Replace power supply. 2 Replace logic board.
Replace logic board.
1 Move volume lever toward front of modem. 2 Replace logic board. 3 Replace speaker.
Troubleshooting Symptom Charts/Apple Personal Modem - 3

Apple Personal Modem

Modem doesn’t beep when plugged in
No sound while modem is operating
1 Turn volume control clockwise and plug in modem again. 2 Verify that power connector is firmly in place. 3 Replace power connector. 4 Replace modem.
1 Turn volume control clockwise and plug in modem again. 2 Replace modem.
Troubleshooting Symptom Charts/Modem 300/Modem 1200 - 4

Modem 300/Modem 1200

Indicator LED not on 1 Replace power supply.
2 Replace logic board.
No sound while modem is operating
1 Turn volume control clockwise. 2 Replace logic board.
Troubleshooting Symptom Charts/AppleFax Modem - 5

AppleFax Modem

Modem lights are not on
Both lights are on or blinking, or yellow light stays on after power on
No sound while modem is operating
1 Replace power supply. 2 Replace main logic board. 3 Replace auxiliary logic board.
1 Replace main logic board. 2 Replace auxiliary logic board.
1 Move volume lever toward front of modem. 2 Replace main logic board. 3 Replace speaker. 4 Replace auxiliary logic board.
Troubleshooting Symptom Charts/AppleFax Modem - 6
Poor print quality from fax machines
Poor print quality after file transfers
Modem sometimes fails to answer
When using the “AT” command set, the modem stops sending after a “buffer-full” condition
1 Have users select “Best” option from Page Setup window. 2 Have users select ImageWriter LQ fonts (3x fonts) for text-
only files (no graphics).
Have users contact sending AppleFax station to determine what fonts are being used.
Verify that AppleFax Modem ROM is revision 1.1 or higher.
Verify that AppleFax Modem ROM is revision 1.1 or higher.
Troubleshooting Symptom Charts/AppleFax Modem - 7
AppleFax Modem application sometimes fails to establish communication with certain facsimile machines
Verify that AppleFax Modem ROM is revision 1.1 or higher.
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Exploded V ie w
Modems

Exploded View 1

Apple Data Modem 2400
Modem 300/ Modem 1200
Apple Personal Modem
AppleFax Modem
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