Printronix MVP Series - Manual (Page 119)

EVFU 6–7
Troubleshooting for EVFU Programming
Refer to the following guidelines when using the EVFU feature.
Printer Operation During EVFU Loading
The printer mechanism should not move during the loading of the EVFU
program. If the printer starts to print or if the paper advances, an error may
be present in the load program.
Forms Length
A Start Load code (1EH) clears the EVFU memory and allows the printer to
respond to Form Feed (FF) codes by producing the forms length selected
with Configuration Option 52.
Top–of–Form
An End Load Code (1FH) turns on the TOF indicator to signify that the
EVFU memory is loaded. If a Form Feed code (Channel 1) is issued or the
TOF switch is pressed, the paper will slew until the printer senses a
Top–of–Form (Channel 1) code.
Line Feed
When the EVFU memory is not loaded, a Vertical Tab (VT) or any EVFU
command code received through the interface causes a single line feed.
Page Perforation Skip
Loading an EVFU program automatically disables the Page Perforation Skip
(Configuration Option 50).
Paper Runaway Protection
The EVFU will slew one line if the EVFU memory program is not loaded
and the host computer issues a control code, line identification code, or slew
code as though the EVFU memory program is loaded and a channel code is
sent (but not loaded).