Ricoh MP7500
After TD sensor initial setting, the value of Vref is less than 250. (EX1: Vref=109, Vt=278 or EX2: Vref=149, Vt=80)
Every 2000 copy cycle record Vref and Vt value
The value didn't change until it is copied to 10,000 sheets.
EX1:
2k copy Vref=109,Vt=7
4k copy Vref=109,Vt=13 --->image density is too high, so stopped the copy
EX2:
2k copy Vref=149,Vt=62
4k copy Vref=149,Vt=33
6k copy Vref=149,Vt=37
8k copy Vref=149,Vt=35
10k copy Vref=149,Vt=31 --->The usage of toner is higher than the normal time (TD sensor initial setting, Vref > 250)
I don't know the reason to cause the situation. The situation (TD sensor initial setting, Vref < 250) doesn't appear for every time.
Have you ever encountered a similar situation? Can you give me some advice?
Thank you very much.
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