Pole Position II Sense Mod Reverse

CamaroMurph

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I'll try to make a long story short........

Began having power issues with PPII. I had already rebuilt the power brick and big blue. Had some sound distortion. Cleaned edge connectors. Still has power problem. So I decided to rebuild the ARII's. My ARII's had the sense mod where they removed R29 and R30 and put in jumpers. It was this way when I got the game.

Rebuilt ARII's. New caps. New +5V transistors, LM305. Still has power problem. +5V at ARII running +5.25 to keep board at +5V Lot's of heat at ARII. So I decide to replace the wiring harness edge connectors. Crimped all those pins.

After this I was able to reduce the voltage at the ARII's by about 0.1V to 5.15V to keep the game boards at 5V. Still had power problem. Seemed to be heat related so I reflowed some of the solder joints and power problem went away but I still had the ARII's driving hard to keep +5V at the boards.

I decided that since I had replaced the edge connectors and I still had to drive voltage hard that I would take a shot and revese the sense mod and see what happened. I removed the jumpers at R29 and R30 and replaced them with the 10 ohm resistors that are supposed to be there. I reinstalled the ARII's, fired it up and bingo. Voltage at the game boards was running +5.2V. I was able to crank the ARII's way back down and all is now good.

Just to put the icing on the cake, I played a couple of games on Fuji and set my new high score of 71110.

I just thought I would share as I see lots of people implementing the sense mod and my experiense is that it was not working well on my game.

Was that short?

Murph
 
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thanks for the post..

thats exactly what i was afraid of and why i never ever have modded a ar2 , just repaired em...

with good connections you should have no need for a sense mod...
 
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