Gestetner B147 Service Manual page 274

TROUBLESHOOTING GUIDE
Direction Area Symptom
Sub-scan Leading Color shift,
edge especially 100 mm
from the leading
edge.
(Refer to pattern 1
on page 4-57 for the
symptom.)
Trailing Color shift,
edge especially 100 mm
from the trailing
edge.
(Refer to pattern 2
on page 4-57 for the
symptom.)
SM
Action Required
Possible Cause
Output Mode
Registration roller Normal Paper
speed is not
1200 dpi
suitable for the
paper used.
Normal Paper
600 dpi
Thick Paper
1200 dpi
(by-pass feed)
Fusing roller Normal Paper
speed is not
1200 dpi
suitable for the
paper used.
Normal Paper
600 dpi
Thick Paper
1200 dpi
(by-pass feed)
4-72
Procedure / Remarks
SP Mode
SP1-004- Check the magenta line position against the black line.
004 If the registration roller is too fast or slow, the magenta
line appears above or below the black line.
SP1-004-
Above: Speed is too fast: Decrease speed
005
Below: Speed is too slow: Increase Speed
SP1-005-
When adjusting the speed, change the setting in 0.05
003
steps, and check the result by printing the grid pattern.
Then, repeat this until the shift between magenta and
black is minimized.
NOTE: If the registration roller is too fast, magenta jitter
may appear at 67 mm and/or cyan jitter at 165 mm from
the trailing edge. This is caused by the mechanical
shock when the trailing edge of the paper passes the
registration rollers.
SP1-004- Check the magenta line position against the black line.
001 If the fusing roller is too fast or slow, the magenta line
appears above or below the black line.
SP1-004-
Above: Speed is too fast: Decrease speed
002
Below: Speed is too slow: Increase Speed
SP1-004-
When adjusting the speed, change the setting in 0.1
007
steps, and check the result by printing the grid pattern.
Then, repeat this step until the shift between magenta
and black is minimized.
B147/B149/B190