Brother HL-2230 Service Manual page 157

27) Inspection Mode Unlock
When find the entered inspection mode PCB in the market. Unlock the inspection mode
with this function.
28) PIT3 Mode
To identify terminals connected via USB interface, the PC requires the corresponding
virtual USB devices to be implemented by driver. If you connect any number of the
printer to your PC, therefore, the same number of virtual USB devices will be
automatically configured on your PC. To prevent virtual USB devices from being
configured limitlessly, enables your PC to identify terminals via single virtual USB device
by entering the PIT3 mode.
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