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Barcode Port Connections 3250/4250 Circuit Description
On models equipped with cable (325033), a compatible version of main board set (325605)
and a properly configured printer interface board (PCB402), diagnostic LEDs, and a test
switch are available in the lower right corner of the larger board (PCB605). D19 is a red
LED that will indicate the printer door/platen interface is not closed or, if blinking, one of
several printer errors have occurred, requiring factory assistance. D20 is a yellow LED that
will indicate the paper is out or not detected when the door is closed. SW1 is a momentary
switch that will cause the paper to advance when pressed or, if held down while main power
is switched on, will place the printer into self-test mode.
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