XEROX DFC165 & DWC165c Service Manual
6-7
PRINT CHART
START/STOP/
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b) Get access to the system test menu and select the
PRINT CHART option
c) Make sure that there is paper in the ASF and then press
START
: the test chart shown in fig. 6-4 is printed out .
d) With reference to the figure, check that:
•
lines 1, 10, 11 and 12 delimit the
printable area
on an A4-size sheet (about 208
x 290 mm)
•
area 2 is used to evaluate that the
transport speed
of the print carriageis uniform:
no shadings should result in the strip
•
area 3 is used for checking
vertical alignment
; run the printer alignment test, if
necessary, to modify the alignment parameters (see section 6.1.1)
•
areas 4, 5 and 7 are used for checking that the
line feed mechanism is uniform
:
-
in area 4, groups of lines are printed close together but must never cross or
overlap (
); the groups alternate in lines corresponding to the
central nozzle on the print head (number 25)
-
in area 5, groups of lines are printed one on top of another and there must be
no space between them (
); the groups alternate in lines
corresponding to the central nozzle on the print head (number 25)
-
in area 7 dark grey and light grey patterns are printed forming a uniform strip,
that is, without black or white lines distributed irregularly across it; if the lines
appear at regular intervals along the strips, some of the nozzles are faulty
Faults found in areas 4, 5 and 7 indicate line feed errors
•
four areas 6 are used for checking "
all black
" printing; check that there are no
white lines present; if there are, some print nozzles may be blocked. In this case,
run CLEANING (see section 6.1.3)
•
area 8 is used for checking the printing of
ASCII characters
•
area 9 is used for checking printing with the nozzles spraying at
maximum
frequency
: there must be no white or broken lines; if there are, run the nozzles
test (see section 6.1.2).
PRINT CHART
STOP
