Gestetner G060 Service Manual page 534

TROUBLESHOOTING GUIDE
Adjustment Standard: Max. 200
As a machine capability, maximum amount of color shift is 200 µm. Adjusting the SP modes (motor speed, registration, and
magnification) can improve the color shifts level; however, there is a limit.
Preparation
When color shift is reported, the following procedure should be done before adjusting the machine and/or SP modes.
1. Print out the SMC sheets (SP5-990-2).
2. Do the forced line position adjustment (SP5-993-2 or 'Auto Adjust' in the User Program mode).
NOTE: Make sure that the result (SP5-993-7) is "0101". If not, solve the problem by referring
to pages 4-2 and 4-3.
3. Print a 1-dot grid pattern using A3/11" x 17" paper. Refer to the following table for the detailed SP mode settings.
Mode
Normal, color, 600 dpi
Normal, color, 1200 dpi
Thick paper
NOTE: When making prints on thick paper from the by-pass tray, the type of paper should be selected in the User Program
mode. Any adjustment needs to be done by using the type of paper which the customer normally uses.
4. Check the tendency of color shift in the grid pattern printed in step 3. Sometimes, a magnification scope must be used to
measure the amount of color shift between colors.
5. Take the required action explained in each section depending on the type of color shift.
6. Do the 'Auto Adjust' in the User Program mode after the adjustment is done in step 5, and check the result.
7. Repeat steps 3 to 6 until the color shift is acceptable.
G570
µ
m
SP5-997 (Test Pattern) Setting
Tray
Pattern
selection
2 05
2 05
0 05
Color mode Resolution
Full Color 600 x 600
Full Color 1200 x 1200
Full Color 1200 x 1200
4-52
Rev. 09/2003
Paper size
(By-pass)
—
—
A3 / 11 x 17
SM