Namco ND-1 Namco Classic Collection Vol1 VR2 resistance value or part number

[GeekMan1222]

Hi I was wondering if someone with a Namco ND1 system board like Collections Vol.1 or 2 can get me the part number / value of the VR2 potentiometer next to the video amplifer chip.
I got a board where its completely missing.

Thanks !

 

[GeekMan1222]

It would appear this VR2 pot controls brightness/video level according to the Mame driver documentation.

If I cross reference the datasheet and example application circuit for the LM1203N video amplifier IC then it would seem as though this pot is tied in with contrast and the example circuit calls for a value of 10K Ohms.

So unless can find out otherwise I am going to be using a 10k ohm pot to test this.

 

[GeekMan1222]

1K ohm checked and measured according to Sams Arcade Fix on youtube