50 • Electrical Trouble Shooting Users Manual Model 656/636
Problem Probable Cause Corrective Action
Print registration is off in the web
direction.
1) Machine incorrectly threaded. 1) Check and rethread the media as
needed. Refer to "Loading
Stock".
2) Web guides incorrectly adjusted. 2) Check and adjust as needed. Refer
to "Web Guide Adjustment".
3) Unwind incorrectly adjusted. 3) Check and adjust as needed. Refer
to "Web Guide Adjustment".
4) Incorrect DIP switch settings on
the Thermal Control Board.
4) Check and reset DIP switches as
needed. Refer to "TCB Dip
Switch S2 Settings".
Print contrast is too light or dark. 1) Incorrect strobe setting selected in
the format.
1) Using Formatter check and adjust
the strobe setting according to the
media and ink being used.
2) Incorrect strobe setting in the
machine setup.
2) Enter the setup menu and readjust
the strobe as needed.
3) Miss adjusted print head position. 3) Set print head position. Refer to
"Print Head Tangent Point".
4) Miss adjusted print head pressure. 4) Set print head pressure. Refer to
"Print Head Pressure Setting".
Voids in print image in the feed
direction.
1) Ink miss aligned with format. 1) Adjust ink position on the arbors
to achieve full ink coverage over
all fields on the format.
2) Print head dirty. 2) Power off the machine clean the
print head and platen. Refer to
"Print Head Cleaning".
3) Faulty print head. 3) After cleaning head and running
the test pattern to confirm that a
void still exists, replace the print
head.
4) Miss adjusted print head position. 4) Set print head position. Refer to
"Print Head Tangent Point".
5) Miss adjusted print head pressure. 5) Set print head pressure. Refer to
"Print Head Pressure Setting".
6) Worn platen roller. 6) Replace platen roller.
Machine continually stops with an
erroneous interlock condition.
1) Sensor uncalibrated. 1) Determine which sensor and re-
calibrate as needed. Refer to
"Sensor Trim Pots".
2) Sensor position miss adjusted. 2) Determine which sensor and
relocate accordingly.
3) Ink sensor type (light / dark)
incorrect in the format for the ink
type being used.
3) Either change the ink or the ink
type in the format.