Toshiba e-STUDIO4500c Service Manual page 573

April, 2007
3003 Vtref:Disp/Set
This SP displays the TD sensor target voltage. This target voltage is inversely
proportional to the density of the toner:
If the target is high, toner density is lowered.
If the target is low, toner density is raised.
The machine uses readings of the ID sensor patterns between pages to determine
the amount of toner coverage and compared with the threhold values for the upper
and lower limit of coverate. The result of this calculation is used to calculate Vtref.
Note: Vtref is the TD sensor reference voltage. It is frequently updated to stabilize
the toner concentration in the development unit.
001 Current Val:K
002 Current Val:M
003 Current Val:C
004 Current Val:Y
005 Initial Val:K
006 Initial Val:M
007 Initial Val:C
008 Initial Val:Y
3021 Set Vt Shift
Use this SP to correct Vt (TD sensor output voltage) in the low speed mode
(128~256 g/m
mode.
001 Shift (Low Spd):K
002 Shift (Low Spd):M
003 Shift (Low Spd):C
004 Shift (Low Spd):Y
Set/Display Vtref
[0~5.00/0 V]
[0~5.00/0 V]
Set Vt Shift Amount
2
). The machine then uses this value to calculate Vt for low speed
[0~500/0 V]
SERVICE PROGRAM TABLES
5-81