Functions of the Control Panel 221
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Change Toner (C/M/Y/K)
Stops printing before the toner is out and helps you exchange the 
developer cartridge by moving it in the developer installment 
window.
Parallel Menu
These settings control communication between the printer and 
the computer when using the parallel interface.
Parallel I/F
Allows you to activate or deactivate the parallel interface.
Speed
Specifies the pulse width of the ACKNLG signal when receiving 
data in the Compatibility mode or Nibble mode. When Fast is 
selected, the pulse width is about 1 µs. When Normal is selected, 
the pulse width is about 10 µs.
Bi-D
Allows you to specify the bidirectional communication mode. 
When you select Off, bidirectional communication is disabled.
Item Settings (default in bold)
Parallel I/F On, Off
Speed Fast, Normal
Bi-D Nibble, ECP, Off
Buffer Size Normal, Maximum, Minimum