WILLIAMS FIREPOWER

[Steevsee]

 

Had a close look at that too, but Iam getting power to the board.

Did you check for power at the 5101 RAM Chip (IC19, pin 22). 

Should be close to 4 volts with new Batteries.

[lenoz]

Yes to both thanks.

[lenoz]

Hey Stevesee, is that the chip closest to the original battery holder (the one by itself to the left of holder) ?

[MartyJ]

Probably a silly question but did you have the coin door open when you tried to switch it off/on quickly ?
Are all 3 balls in the ball through?

Rgds
Dave

Was just about to suggest the coin door.

+1 Dave

[Steevsee]

Hey Stevesee, is that the chip closest to the original battery holder (the one by itself to the left of holder) ?

Yes, mounted horizontally to the left of the original battery holder.

[lenoz]

Thanks Stevesee, not too sure on my end on how to check the voltage of this, but will probably get someone to do it for me unless you could give me some pointers - cheers.

[Steevsee]

Thanks Stevesee, not too sure on my end on how to check the voltage of this, but will probably get someone to do it for me unless you could give me some pointers - cheers.

It's pretty simple to check.

Do you have a Multimeter?

[lenoz]

Yeah mate, have one of those.

[Steevsee]

Ok. With batteries in the replacement holder and main power turned off, set your DMM to Volts DC. 
(If it's not auto ranging, then you will also need to select the appropriate range to measure around 5 volts DC).

Put the black lead on pin 8 (Ground) and the red lead on pin 22.

Pin 8 is the eighth one from the left on the bottom row of pins, and pin 22 is top leftmost pin, as the chip sits on the board.

Let us know what reading you get.

[lenoz]

Approx 3.0 volt

[Steevsee]

You need at least 3.6 volts at the chip to get out of audit mode.

Maybe test the batteries individually to make sure they are all 1.5v minimum.

[lenoz]

Yes, i have done all of that steve, tried more new batteries still no more than 3 v registering - could the chip be at fault, looks easy enough to change out as it has the plug type holder.

[MartyJ]

Yes, i have done all of that steve, tried more new batteries still no more than 3 v registering - could the chip be at fault, looks easy enough to change out as it has the plug type holder.

Are the battery holder terminals clean - ie no green fuzz on them?

[lenoz]

Yes, they are all clean & I have tested the voltage also where the wires from holder are soldered to old battery holder on CPU board and Iam getting 4+ volts there also.

[Steevsee]

Yes, i have done all of that steve, tried more new batteries still no more than 3 v registering - could the chip be at fault, looks easy enough to change out as it has the plug type holder.

I probably wouldn't change the chip at this stage.

Try checking the voltages at the battery holder leads where they enter the board, then at the blocking diode (D17) which is directly above the 5101 Ram chip.

See here for location of this diode if you are unsure. http://pinball.flippers.info/system6mpulowres.pdf