Muratec F-110 Field Engineering Manual page 69

Circuit Description
4-4-2-11. Environment Recognition
THV voltage recognizes changes in transfer roller environment and allows the voltage suitable for the environment in order to
realize optimum image output. The analog input is converted to digital output by the comparator that recognizes the environ-
mental changes of the transfer roller. It is to allow the right transfer voltage to perform appropriate environmental response con-
sidering the environment and the type of paper depending on this digital output by the programs that can be input to the engine
controller ROM.
For ML-5000 or ML-5200 series, this environment recognition setting is organized as follows: First, set the THV(+) standard
voltage. Allow 200M load to transfer output, enable output and set the standard voltage 800V using VR201. Then set 78
(CPU's recognition index value) as the standard using VR302. This standard value with CPU makes sure that the current feed-
back is 4µA when output voltage is 800V and load is
200M .If the load shows different resistance value when 800V is output, the current feedback will also be different and thus
the index value will also be different. according to the index value read by CPU, the transfer voltage output will differ according
to the preset transfer table.
The changes in transfer output required by each load is controlled by PWM-DUTY.
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