2-58 Service Manual
4500–E220/E321/E323
Paper port communication failure
Indicates an error communicating with Tray 2, if installed. Remove
Tray 2 and recheck. If the error doesn’t recur, replace Tray 2. If the
error recurs, replace the controller card assembly.
Invalid command parameter
received by specified device
(984).
Invalid command received by
specified device (983).
Communications error detected by
specified device (982).
Engine protocol violation detected by the
specified device (981).
Engine experiencing unreliable communications to
specified device (980).
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