Paperboy ARIII: What voltage should the negative sense test point have on it?

Black Matrix

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Paperboy ARIII: What voltage should the negative sense test point have on it?

Hey all,
Just rebuilt an AR-III for a paperboy that was having some resets. After getting the PS back it, it started resetting a bit more. I pushed around some on various chips. Cleaned some crusty connectors on the AR-III and lower PCB. Now, I'm getting nothing but garbage. Won't boot, and won't go into test mode. Tested all the voltages I could and the only one that appears to be missing is the -sense. Does the negative sense voltage control a watchdog circuit. It may just need all the sockets/connectors cleaned or it could have a serious PCB problem now. But I'm hoping its fine and just a weird PS problem. The other voltages actually zeroed in pretty close. Anyone have any insights or places to start. Thanks in advance.
 
Mine's reading .2 or .02 so that's pretty close. I think everything went well on the PS rebuild. Looks like I may have to start cleaning chips and sockets on the pcbs next.
 
Mine's reading .2 or .02 so that's pretty close. I think everything went well on the PS rebuild. Looks like I may have to start cleaning chips and sockets on the pcbs next.

If it's .02V, yes that is quite close to zero. If it's 0.2V at the game PCB -SENSE, relative to the power supply GND, then you have fairly significant voltage drop. This would be an indication that the PCB edge traces and/or the edge connector pins (the power and gnd ones) need attention (i.e. cleaning or replacement).
 
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