Toshiba e-STUDIO 4500c, Service Manual

Page: 572 / 1120

SERVICE PROGRAM TABLES April, 2007
5-80
Group 3000
3001 TD Sn:Vt Display TD Sensor: Vt Display
Displays the current value of Vt (output voltage of the TD sensor). This is the value
that the machine uses to calculate the density of the toner in each development unit.
The toner density is checked after every page prints. The TD sensor output voltage
is inversely proportional to the toner density:
•
If toner density is high, the voltage is low.
•
If toner density is low, the voltage is high.
Note: These readings are used to control toner supply. When the machine uses PID
logic to control the machine (the default method selected with SP3301 001). The
difference between Vt and Vtref is calculated and this result is used to control the on
time of the subhopper clutches that control the supply of toner to the PCUs. For
more see "Toner Supply Control" in Section "6.11.4 Details" of the Service Manual.
001 Current Val:K [0.00~5.00/00.00/0.1 V]
002 Current Val:M
003 Current Val:C
004 Current Val:Y
3002 Vtcnt:Disp/Set Display Vtcnt (TD Sensor Control Voltage)
Use SP 3002-001 to 004 to display and confirm the present Vtcnt setting. Vtcnt is the
TD sensor control voltage. If there is a large difference between this value and the
value of SP3002-005 to 008 (Initial Vtcnt), this means that over time Vtcnt will
require large adjustments due to environmental conditions. The initial value of Vtcnt
is determined when the developer is initialized. This value is used as a reference to
adjust Vt during the auto process control self check and when the TD sensor checks
the toner density between pages.
001 Current Val:K
002 Current Val:M
003 Current Val:C
004 Current Val:Y [0~1200/0 V]
005 Initial Val:K
006 Initial Val:M
007 Initial Val:C
008 Initial Val:Y [0~1200/0 V]