Service manual

TROUBLESHOOTING GUIDE 2
SM 4-61 G130/G131
Trouble-
shooting
Pattern 3
Color shift (magnification change) in the main-scan direction
Fig. 1 and 2 shows that the colored (dotted) line has shifted away from the black
line. The amount of shift is not the same as at the front, center, and rear. Both Fig.
1 and Fig. 2 show that the color grid is larger than the black grid. Yellow becomes
larger from left to right in Fig. 1. Cyan and magenta become larger from right to left.
This is because the laser writing direction for B&Y is different from C&M.
Pattern 4
Color shift (registration) in the main-
scan direction
Colored line shifts in the main-scan
direction. This keeps the amount of
shift the same at the left, center, and
right.
This is caused by incorrect color
registration.
G130T511.WMF
G130T512.WMF
G130T513.WMF
Fig. 2 (Cyan & Magenta)
Fig. 1 (Yellow)