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IBM 6151 Maintenance And Service Manual page 127

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D3x
Modem Interface Problem
This SRA number is generated from an error log entry. There
may be a problem with the interface
to
the modem. Either the
adapter in the location indicated by the x in the SRA number
or a modem attached
to
that adapter is failing.
Run the System Checkout to check any repairs.
D6x
Electrostatic Discharge Problem
This SRA number indicates that an electrostatic discharge
problem may exist.
D7x
Media Problem
This SRA number is generated from an error log entry. There
may be a problem with the media (diskette, tape cartridge).
Try new media to isolate the problem.
(6/88) Problem Isolation Charts
3-0020-49

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