Shadow, The
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Quoted from zaza:The ZC signal itself can be measured with a multimeter (if it has a freqency function) or with an oscilloscope. In the UK it will read 100 Hz.
In the US it will read 120HZ. Just cause I like posting pictures...
Measured with a meter at TP4, setting DC Hz.
ZC2 (resized).JPG
Quoted from Durzel:Presumably the ZC test pictured there is one probe on the TP4 point and the other probe on the ASIC pin highlighted in zaza's image further up?
I should have put my shoplight on that 
With the meter, one lead is on TP4, the other is on the GND TP.
Quoted from Durzel:Does that achieve the same result as zaza's suggestion in this post - https://pinside.com/pinball/forum/topic/wpc-s-gi-question#post-3991479 ?
Where is GND TP?
Sorry, I meant to attach a picture...This is where you would connect a muti-meter to measure frequency.
pasted_image (resized).png
Quoted from Durzel:Does that achieve the same result as zaza's suggestion in this post - https://pinside.com/pinball/forum/topic/wpc-s-gi-question#post-3991479 ?
To do a resistance check, you will need to measure between the ASIC on the CPU board, and TP on the Power driver just like in Zazas image, you will likely need to have a pair of needle point leads to make this check. https://www.amazon.com/gp/product/B000VRFL10/ref=oh_aui_detailpage_o02_s00
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Buffalo, NY
Hamilton, ON