Hi All,

So the machine has been working well. Turned on this morning and now it boots in to Adjustments. Both LED's come on then go off.

Measured 3.8v on 5101 - pin 22 with machine off

With Door Open:

1) Turned off/on quickly a few times - no change
2) Did dip switch 7 - factory reset. Middle switch down and pressed forward once. Displays show it move through adjustments. Pushed MPU Master Command switch and both led's flash once and then go off. Turned off switch 7. Reboot twice - no change
3) Removed - socketed and replaced the Static RAM 5101 - repeated above - no change
4) Tried a few 5101's and repeated above - no change

What's next?

Measured 3.8v on 5101 - pin 22 with machine off - so batteries ok

There was a blocking diode in the battery holder as well so took it out and it's now 4.3v

Still getting a memory error. With the test ROM I get one flash on the control test LED then it comes back on and stays on. If I'm right that is also indication the 5101 static RAM?

I have checked all pins on the new socket and it pins out to it's next location.

IC7 & IC11 change output state when the memory test is triggered...

IC27

Does anyone have a pic of what pin 3 output R/W should show when memory test is triggered?

My Pin 1 signal shows high voltage (basically a straight line) changing to a high data when triggered.
My Pin 2 shows low and stays low when triggered.
My Pin 3 is High voltage and stays high when triggered (no data). I'm thinking this should change to "High Data" when triggered basically letting Pin 1 signal through...?

Replaced IC27 4071 - no difference.

Baffled - as far as I can see I'm getting the right signals on chip select. Data and Address lines look fine and the LED's are flashing on and off with the test program so they should be fine...

There's not much left???

What else can make the 5101 fail it's test???