Xerox Document FaxCentre 165c Service Manual page 89

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 (
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 (
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).
XEROX DFC165 & DWC165c Service Manual
); the groups alternate in lines corresponding to the
PRINT CHART
START/STOP/← /→
PRINT CHART
); the groups alternate in lines
STOP
6-7