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193
ERROR CODES, LIGHTS, SWITCHES, AND
TEST POINTS (CONTINUED)
Control Panel Switches
The control panel contains the following switches:
Power, Start, Stop, Line Feed, Form Feed, Line Spacing,
and Status.
Power switch-A 2-position switch that switches on AC
power to the printer.
Start switch-A momentary contact switch that causes
the printer to become ready if an error condition does
not prevent it from doing so. Pressing the Start switch
is required after the power on diagnostics in order to
make the printer ready. The Start switch also provides
the enter and execute functions when offline tests are
selected by using the Line Feed and Form Feed
switches.
Stop switch-A momentary contact switch that causes
the printer to become not ready. The switch must be
pressed before operator intervention occurs when
changing or aligning forms. As part of the error
recovery procedures, the Stop switch turns off the Unit
Check, Data Cleared, Graphic Check, and Forms lights
as well as the numbered lights and the Attention light
(with the Audible Alarm if it is present). The Stop
switch also stops execution 'of the offline tests.
Line Feed switch-A momentary contact switch that can
operate in 2 different machine modes:
193
Normal mode-This switch causes a single line feed if
the Stop switch was pressed first; if the Stop switch
was not pressed" no action results.
Test mode-This switch is used with the Form Feed
and Start switches in selecting offline tests. The line
feed action is not done when the printer is in test
mode.
Wiring Diagram,
Diagnostic Aids
Form Feed switch-A momentary contact switch that
operates in 2 different machine modes:
Normal mode-This switch causes a series of line
feeds to the start of the next logical page if the Stop
switch was pressed first; if the Stop switch was not
pressed first, no action results. If the forms length
has not been set by a 'set vertical format' control
character, the forms length defaults to 1 line feed.
Test mode-This switch is used with the Line Feed
and Start switches in selecting offline tests. The
forms feed action is not done when the printer is in
test mode.
Line Spacing switch-A 2-position switch that allows 6 or
8 lines per inch to be selected.
Status switch-A 3-position switch:
Cancel-A momentary position that causes' cancel
request' status to be sent to the controller. The
switch has no function when the printer is in test
mode.
Normal-Places the 5256 in online mode for operating
with the host system.
Test-Places the 5256 in offline (test) mode for
problem determination or diagnosis.
Test Points
Test points are available on printer board A 1 in the left
rear corner (viewed from the back) and on the
interposers on planar board B 1. The points are
referenced from the MAPs and service procedures.
Maintenance
5256 MIM
1-93
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