Tempest power issues

My star wars is the same, and all my spare AR2's Hmm

Sorry for that :(

No worries. I'm back to the harness either way — I'm losing 1v between the AR2 and the +5v test loop on the game PCB.

Can I just pull the +5v wires right out of the edge connector to measure resistance and possibly replace?
 
No worries. I'm back to the harness either way — I'm losing 1v between the AR2 and the +5v test loop on the game PCB.

Can I just pull the +5v wires right out of the edge connector to measure resistance and possibly replace?

5% (0.25V) is typical acceptable loss, and more may indicate a short
 
5% (0.25V) is typical acceptable loss, and more may indicate a short

Have any tips for tracking that down?

Ratty harness or not, it is getting the voltage there. With the game PCB unplugged, I get +5.2v (on the +5REG line) all the way to the pin of the edge connector. When I plug the game PCB in, I get +4.27v, measured either on the trace on the game PCB or on the molex on the AR2.

So something seems whacked in the game PCB.
 
Have any tips for tracking that down?

Ratty harness or not, it is getting the voltage there. With the game PCB unplugged, I get +5.2v (on the +5REG line) all the way to the pin of the edge connector. When I plug the game PCB in, I get +4.27v, measured either on the trace on the game PCB or on the molex on the AR2.

So something seems whacked in the game PCB.

Start with the easy stuff, like new pins on the the molex plugs in the circuit.

Some molex plugs are designed to handle 27 unplugs. That's it! So about 1 per year

Might also be time to fit a new edge connector/s on the PCB. I did this to my Asteroids and Lunar Lander for reliability, using heat shrink

Could be a simple thing like that, a high resistive joint.

Also, if you haven't already, re-flow the solder to the molex plugs on the PCBs

Maybe other guys have other ideas?
 
Back
Top Bottom