I am including a tech sheet just in case it has more info than the one you are using
http://www.servicematters.com/d...heet%20-%20W10035270.pdfWith the unit plugged in and the User Interface unplugged.
Be very,very careful as 240 volts can be lethal
Check that P8-2 to ground is 0 ohms. Check it first using volts as you do not want to blow your meter.
P8-3 to P9-2 should be 115 VAC
P8-4 to P9-2 should be 115VAC with the door closed.
If not you may have a bad connection/wire
I am assuming that P5-8 is a common as it is marked +/- 12 VDC
P5-8 to P5-1 should be -12 VDC
P5-8 to P5-3 should be +12 VDC
They may be backwards as it depends on what type of logic they are using.
If either is missing then I would go for the control board first. Note I am assuming that the 12 volt supplies are on the control board but am not sure about this.
If all the above is OK then it is a crap shoot as either device can cause your problem.
Take a look around and see if you can find a supplier that will let you return the un-needed part.
Without specialized data logger equipment and info that is not available from the manufacturer you cannot troubleshoot any further.
Hopefully someone else will jump in who has lots of experience with these units and can guide you to the most likely.
You may want to try the following:
Unplug the unit
Open it up
Remove the ribbon cable from the keypad to the control board at the control board.
Clean the edge connector.
If it is the type where there is not a connector just the insulation is removed, it can be cleaned with a pencil eraser. Do not use an ink eraser as it is too abrasive.
Check the tracks in the ribbon cable for hairline cracks. A magnifying glass helps here.
Would not hurt to clean the connector on the board. Use electronics contact cleaner or isopropyl alcohol and a tooth brush. Be gentle and do not reconnect till all the solvent evaporates.
Reconnect everything and give it a try.
Also use the magnifying glass and look for cracked trails on the circuit boards and cold solder joints (often a gray color instead of silver or pin holes) Sometimes you can gently jiggle a component while looking at the soldered side and see the leg move in the solder.
