Demo Man reset

[Big Phil]

Hi,

My demo man is resetting when both flipper buttons are pressed. If you press either of them by themselves, it's fine. Press them both together and it resets.

I seems to be from cold boot.

Any pointers?

Tell yer what, I'll leave it on for 15 minutes and try it.

Philip

 

[Sgt GrizZ]

Very common, and often a problem with the power connectors. Reseating them can 'cure' it, though it may come back and need further attention. Andy Netherwood produced the blurb below .....which tells you which ones. Start with that and see how you go

Also useful info here ...

http://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Game_resets


Andy N's reset blurb ...........................

A problem with BR2 is a possibility, but is in fact rarely the cause
of most reset problems.

It is more likely that there is a bad power connector. You need to
carry out these checks first.

Measure against ground on a DC scale the voltage reading at TP2 on
the power board – the 5V test point. If this is below 4.9 V then you
have a problem on the power board, either with the LM323K regulator
or the J101 power input connector.

Look to the right hand side of the power board and locate connector
J101 which has red and blue wires. Remove and replace a couple of
times. If it is scorched then it needs replacing. Re-check the 5V and
see if any improvement.

If still less than 4.9V then replace LM323K rectifier.

If 4.9v or above, make a note of the reading and then take another
measurement on the CPU on the top end of the copper coil you can see
to the right hand edge of the CPU. If this is more than 0.04V less
than the recorded reading from TP2 then the power connector between
the two boards is at fault.

Locate the short grey ribbon connector that joins the CPU and power
driver board.

Now remove and replace the connector directly below this on the power
driver board. Do this several times, which basically removes
contaminants and improves connectivity.

This may well solve the problem, but it may re-emerge in the future
and the connector may need replacing long term.

If all the voltages are good, and you have more than 4.9V
consistently on the CPU then you are at liberty to replace BR2 and
its capacitor.

 

[Big Phil]

Thanks for that!