Ricoh Neptune-P1 Service Manual page 253

5. Service Tables
53 Cassette
1918 F/M M Chg
These SP modes adjust the rate of the speed reduction between the main motor and the fusing
motor. During normal operation, the line speed in the fusing unit is slightly faster than the line
speed at registration. This keeps the paper slightly stretched to prevent wrinkling and skewing.
However, if the speed of the drum becomes slower as a result of a change in the amount of
buckle at the registration roller, the tension on the paper will pull on the drum and rotate it faster
than the rotation of the main motor. This can cause image distortion at the two LPH joints.
To prevent such distortion, use this SP to decrease the speed of the fusing motor. While this
lowers the line speed slightly, it also keeps the correct amount of tension on the paper between
the fusing unit and registration roller to prevent skewing and image distortion.
Important
5
• There are two adjustments for each feed source and paper width: (1) "Chg Timing" and
(2) "Chg%".
• Always do the "Chg Timing" adjustment before doing the "%Chg adjustment".
• The "Chg Timing" adjustment sets the length of paper to feed before the speed reduction
rate ("Chg%) takes effect.
• The "Chg%" adjustment sets the rate of speed reduction between the main motor and fusing
motor.
10 RT1P>611
11 RT1P>461-610
12 RT1P>298-460
13 RT1P<297
[0 to 15000/170/1mm]
15 R%1P>611
16 R%1P461-610
[-9.99 to 9.99/-0.2/0.01%]
17 R%1P298-460
[-9.99 to 9.99/-0.4/0.01%]
18 R%1P<297
252
[-100 to +100/0/1]
Fusing/Main Mtr Speed Change
Roll/1st Chg Timing/Plain/Width > 611mm
Roll/1st Chg Timing/Plain/Width 461-610mm
Roll/1st Chg Timing/Plain/Width 298-460mm
Roll/1st Chg Timing/Plain/Width < 297mm
Roll/1st Chg %/Plain/Width > 611mm
Roll/1st Chg %/Plain/Width 461-610mm
Roll/1st Chg %/Plain/Width 298-460mm
Roll/1st Chg %/Plain/Width < 297mm