Add ground balance to this

[Daxxin]

Hello , this is pic of my CM whites , i wish to add ground balance since do not have
in the board theres 2 trimers 'PHASE' and 'THRESHOLD' can i do some mods to this board?

[Carl-NC]

"Phase" is the GB pot.

[Daxxin]

Thanks boss for the reply so i just need to remove the trimer and wire a potentiometer ....do you think worth to add pot also for threshold?

[Carl-NC]

If you want to hear the threshold, then yes.

[Qiaozhi]

I bought a Prizm II off eBay last year for a cheap price. It worked OK in an air test, but was absolutely useless when tested outside, as the ground balance was out of adjustment. Presumably someone had already fiddled with the internal Phase control and left it in the wrong position, but after correct adjustment it was a completely different machine. It looks like the Prizm and the CoinMaster are very similar.

[Daxxin]

Prizm and CM looks like , the frequency of CM is 8Khz and Prizm i think 6,59Khz maybe , look at the P8 empty position marked 'LJ'what can be that switch?

[Qiaozhi]

Prizm and CM looks like , the frequency of CM is 8Khz and Prizm i think 6,59Khz maybe , look at the P8 empty position marked 'LJ'what can be that switch?

The postion you referred to as "LJ" is actually "P8", which is presumably a 2-pin connector. This is not text, but is a part of the silkscreen for the connector to show the correct orientation. The silkscreen breaks across a via, making it look like "LJ".

[Daxxin]

LOL you are right its silkscreen ...watching better i think is the connector for different md model with different battery package, power supply connectors , phase trimer its 19,7Kohm
actually set at 4,73Kohm ,who know what mean I39WX in the top of white component