Theatre of Magic
Bally, 1995Quoted from Borygard:Loving the discussion in this thread! I've hoped for a long time that the mantra of "replace the bridges and caps" would end, and it looks like that's actually happening.
Also, the ridiculous reset daughter board not coming up as an immediate suggestion is awesome.
This is one of the best posts I read on here in a very long time, and I couldn't agree with you more.
Quoted from PinballManiac40:The discoloration on the red 5v input wires of J101 is not helping much either.
I'm sure its not ... I would be much more interested in the 5VDC reading on the CPU board than any other measurement as this will tell you both the CPUs operating voltage, as well as the voltage loss from the PDB, as it's the voltage difference measured between this point and the +5V TP on the PDB.
IMG_1716 (resized).JPGQuoted from Pin_Guy:I'm sure its not ... I would be much more interested in the 5VDC reading on the CPU board than any other measurement as this will tell you both the CPUs operating voltage, as well as the voltage loss from the PDB, as it's the voltage difference measured between this point and the +5V TP on the PDB.[quoted image]
Are there test points on the CPU? Not sure I can see what you're testing in the image there.
Quoted from harryhoudini:Are there test points on the CPU? Not sure I can see what you're testing in the image there.
This is measured across C31 the red and black test clips, the large capacitor on the CPU board, one side is your 5V source through the Inductor, the other side is ground.
IMG_1713 (resized).JPGQuoted from Pin_Guy:This is measured across C31 the red and black test clips, the large capacitor on the CPU board, one side is your 5V source through the Inductor, the other side is ground. [quoted image]
Thanks, I'll test it out
Quoted from PinballManiac40:Based on the age of the game, some may have been already changed over the years.
https://www.greatplainselectronics.com/proddetail.asp?prod=QED123
Suggest 10.
Quoted from PinballManiac40:Suggest 10.
HA, I didn't even see that before. I ordered 20 to be safe.
Sadly... I have a bunch of individual LEDs from various projects, mostly failed 
Quoted from Pin_Guy:I'm sure its not ... I would be much more interested in the 5VDC reading on the CPU board than any other measurement as this will tell you both the CPUs operating voltage, as well as the voltage loss from the PDB, as it's the voltage difference measured between this point and the +5V TP on the PDB.[quoted image]
I was most definitely wanting to know as well. I just hadn't had a chance to write about it.
Quoted from harryhoudini:4.82v across C31
.04V loss from the 5V test point on the PDB to the MPU is very good.
Looks like once you get C5 replaced you'll likely be in good shape, I would be interested in what the AC ripple voltage is. To take this measurement, just put your voltmeter leads between the 5V test point and ground on the MPU and switch your meter to AC volts. This would make a good comparison point to see how much this ripple voltage decreases with the new capacitor.
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