Panasonic CF-62 Service Manual page 13

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CF-62
FDD problem
Floppy disk is scratched or otherwise damaged.
Content of floppy disk is destroyed
Damage to contents written to floppy disk.
Damage to contents read from floppy disk.
Abnormal sound
Diagnostic Test reports problem in FDC.
Data cannot be sent or received.
Transmission problem
Unit will not communicate with another computer when connected
directly.
Unit will not communicate with modem.
Diagnostic Test reports problem in serial port.