Halftone Test Print (Pgtype=05) - Canon 1000 Service Manual

7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS

5. Halftone Test Print (PGTYPE=05)

Use the halftone test print to check transfer
faults (failure), black lines, white lines, and uneven
intervals.
To select a color, use service mode:
TEST>DENS - Y/M/C/K.
a. Transfer Faults (failure)
If a transfer fault is noted, suspect a fault in the
transfer belt or the static eliminating assembly.
b. Black Lines
If black lines are noted, suspect scratches on
the photosensitive drum or dirt on the primary
charging wire.
c. White Lines
If white lines are noted at the same location for
all colors, suspect a fault on the transfer belt.
If they occur at different locations, or if they oc-
cur in one color only, suspect a fault in the develop-
ing assembly.
7-60
COPYRIGHT © 2001 CANON INC.
d. Uneven Intervals
If uneven intervals occur, suspect the following:
• If at intervals of about 0.5 mm, suspect the
scanner*.
• If at intervals of about 38 mm, suspect the de-
veloping cylinder.
• If at intervals of about 1.6 mm, suspect the
drive gear.
*Will not occur on test prints.
Figure 7-306
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)