Here's some info and possible steps to take. This is from the HP website.
Error 388 for a HP LaserJet 3050
The local machine has originated a fax session and detected a remote fax machine but has been unable to detect any T30 frames. If the machine is in V.17 mode, it is likely the connection has been interrupted. In V.34 mode is also possible for this error to occur due to compatibility problems with certain machines and/or line conditions.
Solution:
1. Reattempt the fax transmission at a different time when telephone line conditions have improved.
2. Disable V.34 on the local machine and attempt the transmission using the V.17 mode. ( See error 227 for changing to a slower speed or disabling V.34 .)
Disable V.34 on local machine
V.34 is the modem protocol used by the product to send faxes. It is the worldwide standard for full-duplex modems sending and receiving data across telephone lines at 1,200 or 2,400 bps. The default setting for V.34 is
ON .
Follow the steps below to disable V.34 setting.
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Press Menu/Enter .
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Press the < or > buttons to select Fax Setup , then press Menu/Enter .
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Press the < or > buttons to select All Faxes , then press Menu/Enter .
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Press the < or > buttons to select V.34 , then press Menu/Enter .
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Press the < or > buttons to select OFF , then press Menu/Enter to save the selection.
Hope this helps, samson39
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