Main Service Program Mode Tables
SM 5-39 B234/B235/B236/D101/D102/D103
Service
Tables
3904 VH Adjustment
These SP codes allow adjustment of the target Vh (standard drum potential for
halftone) for process control. Adjust setting for a drum that has been in use for a long
period of time if the text is not sharp. This problem can occur with drums designed for
longer service life. Raising the value reduces the amount of light fired from the LD unit.
However, if the adjust is set too high, this can lower image density and cause poor
reproduction of low contrast images.
Note: Changing this SP resets the standard for SC428 (Drum Potential Sensor Error 3:
Vh Adjustment Error). If the target is adjusted to 300V, for example, the standard for
drum potential sensor sampling of Vh will be reset to 300V
±20.
001 VH Adjustment This resets the target Vh for machine operation (but not
low speed mode).
[100~500/300/10V]
002 VH Adjustment (Low Speed) This resets the target Vh for low speed mode only.
[100~500/300/10V]
3905 OPC Drum Initial Setting
Press [Execute]
This sets the initial count for the drum to zero. This SP must be executed after the OPC
is replaced.
3906 VB Correction
Vb (development bias) is used during process control to control drum potential.
Normally, VB is recalibrated every 11,400 minutes (about every 8 days).
001 On/Off Setting Switches periodic calibration of Vb off on.
[0~1/1/1]
0: Off
1: On
002 Correction Counter When SP3906 1 is on, use this SP to adjust the interval between
VB calibrations.
[3800~9999999/11400/1 min.]
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