(Topic ID: 296748)
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High Speed
Williams, 1986
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Harleysville, PA
Quoted from ChrisHibler:That is called segment b'.
Reseat J1 on the MPU and on the display panel.
Examine the area around the 74154 4 to 16 decoder for corrosion.
If you can, post a picture of that area so we can see it.
Do you have a logic probe and are you familiar in it's use?
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info
I will do what you suggested and get back I do have a logic probe but I'm not experienced with it
Quoted from ChrisHibler:That is called segment b'.
Reseat J1 on the MPU and on the display panel.
Examine the area around the 74154 4 to 16 decoder for corrosion.
If you can, post a picture of that area so we can see it.
Do you have a logic probe and are you familiar in it's use?
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info
1626387963977426278844087680012 (resized).jpgQuoted from ChrisHibler:You are pointing to pin 24. It will be high.
Pin 1 is across the chip on the same end.
Retest again, now knowing the correct pin numbers.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info
They are all pulsing except 12
I don't really know what I'm doing... but I checked for continuity from the pin you suggested on U51 to src9 pin three and have continuity?
2 weeks later
Quoted from mtbpinball:I don't really know what I'm doing... but I checked for continuity from the pin you suggested on U51 to src9 pin three and have continuity?
Any ideas? I would like to repair this missing segment. Other pic shows all working good.. not long ago.
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