TroubleshootingSymptom Charts/Internal Modem (Continued) - 42

Internal Modem (Continued)

Modem has no sound

1

Verify that Control Panel volume setting is 1 or above.

output

2

Replace modem card.

 

3

Replace logic board.

 

Note: When replacing the logic board, check that the EMI clips

 

are securely attached to the CPU stiffener. The “CPU Stiffener”

 

topic in Take Apart helps you locate and identify the two EMI clips.

 

If both clips are not secure, replace the CPU stiffener.

Modem connects but

1

Verify that remote modem needs error correction (error

does not communicate

2

correction is internal modem default).

with remote modem

Type AT &Q0 to disable error correction.

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Apple 230, DUO 280C, DUO 27C, 250, POWERBOOK DUO FLOPPY ADAPTER manual Internal Modem