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Author Topic: 504 board E23/D3 jumper  (Read 558 times)

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Offline Nepa Coin Op

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504 board E23/D3 jumper
« on: November 19, 2019, 06:22:14 PM »
Does anyone know the purpose of the jumper from D3 to E23?? Most all the boards I have here have that jumper in place except for one, all are same model same REV. wondering if this could be my eeprom error problem
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Offline Trisail

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Re: 504 board E23/D3 jumper
« Reply #1 on: December 04, 2019, 09:24:10 AM »
I did some looking at boards and prints. I am not able to determine the purpose of the jumper. What I found - the D3 side is VCC ground, E23 goes to U68 pin 30 an I/O pin on chip, E23 on - 500 boards is left floating, 502 boards it is grounded and the print I looked at (512) it is grounded.

I will assume it was decided to ground the pin in later revisions for some reason, maybe stability?

I don't believe it would have anything to do with eprom (eeprom) errors.
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Tony

You can fix almost any electronic device by replacing the aluminum electrolytic capacitors.

Offline Nepa Coin Op

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Re: 504 board E23/D3 jumper
« Reply #2 on: December 04, 2019, 11:07:33 AM »
Print you mean schematic ??? If so care to share the drawing ?? I have a few here with acid damage I’m working on the drawing would help greatly
Thx
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Offline Trisail

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Re: 504 board E23/D3 jumper
« Reply #3 on: December 05, 2019, 08:34:28 PM »
Your inbox is full. You need to delete some so I can PM you.
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Tony

You can fix almost any electronic device by replacing the aluminum electrolytic capacitors.

Offline Nepa Coin Op

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Re: 504 board E23/D3 jumper
« Reply #4 on: December 05, 2019, 09:29:43 PM »
Try in a few min I’ll clean house now
Thanks
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