Home Tech Solution STN After installing the module, the contrast is not good enough. There is no VR on the module to control the contrast. How to adjust it?

After installing the module, the contrast is not good enough. There is no VR on the module to control the contrast. How to adjust it?

When the customer didn't use the VR for the contrast, we can use the R6 to adjust the contrast into the acceptance range. So how to get the R6 value? First, use one VR to replace R6, then switch on the module while adjusting the VR. Remove the VR after we get the right value of the VR. So the VR value is the R6 value. 

Vo value can also be adjusted by varying the value of R6.

Vo value can also be adjusted by varying the value of R6.
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