Author Topic: Flashing NETPLEX link is down. (Read 996 times)

Double D · « **on:** January 17, 2024, 02:00:12 PM »

Hello all. First time posting long term lurker. I have an S2000 IGT double Diamond with the enhanced board. Machine was purchased in 2019 and has been flawless until recently. I received a battery low error and bought the 2354 3v to replace the old one. The Varta battery was installed. After installing new battery I was able to get the error code for ram error with the 4 key turns etc, and it went to “please close door”. I let it sit for the recommend couple of hours and nothing. So I pulled the MCU and noticed the VARTA did indeed have corrosion so I removed it and I also removed U16 chip at same time. Put the MCU back in the slot and now I get a flashing NETPLEX link down and a flashing red light on the MCU. Machine worked fantastic up to the low battery and now I can’t get it to boot at all.
Will a clear and key work? Optics are bypassed and I haven’t plugged or unplugged anything on the machine except for the MCU which is enhanced 1270
Thank you in advance.

dailey · « **Reply #1 on:** January 17, 2024, 03:46:43 PM »

Before going any further, I recommend ruling out the power supply. Do you have another you can swap with ?

Double D · « **Reply #2 on:** January 17, 2024, 08:15:49 PM »

No I don’t. I guess I should order one and try it out. They seem to be a common cause of failure as well.

dailey · « **Reply #3 on:** January 17, 2024, 09:31:14 PM »

There is a long list of things that can cause a Netplex Link Down error, but the two most common seem to be a bad power supply and acid damage from the Green Varta battery. Even after removal of the green battery, the damage might have already been done and usually requires replacing the board.

If you have a multimeter, verify the 13 & 25 vdc output of the power supply. Also verify the voltage on pin #7 which should be 5 to 8 vdc. Pin #7 being out of spec will bring the system down, even when 13 & 25 vdc appear ok.

lookes · « **Reply #4 on:** January 18, 2024, 06:07:04 AM »

Check the board connectors for bent pins. Check the game board for bent pins as well. Is the only LED flashing the red one? All the others are on?

Double D · « **Reply #5 on:** January 18, 2024, 10:39:14 AM »

Thanks for the replies guys.
The MCU is flashing 3rd and 4th amber and last red. The 3rd amber and red flash in sequence.

Double D · « **Reply #6 on:** January 18, 2024, 11:50:06 AM »

Checked the pins and removed the power supply couldn’t get 5v on the 7 pin. Not sure if where the 13 and 25VDC output is? I could use help in locating that on the power supply. I also checked the fuse it is good. I have very limited micro electrical experience. I operated and broke the avionics in the Navy not work on them. All help is truly appreciated. I ordered a new powe supply from gamblers oasis.

hotlsot · « **Reply #7 on:** January 18, 2024, 12:18:16 PM »

checking the power supply is always a good idea in this situation. But my concern is the flashing red light after a u16 removal. That almost always indicates a bad board. Try putting the varta back on the board and see if you can move forward from there. If not wait for the power supply to arrive, but I'm afraid your board is toast.

Double D · « **Reply #8 on:** January 18, 2024, 02:17:14 PM »

Thanks guys. Lookes helped me trouble shoot some more. I am gonna try the power supply and will let you all know. Great resources. Thanks.

Stayouttadabunker · « **Reply #9 on:** January 18, 2024, 02:19:15 PM »

Could we see a close-up photo of the area where the Varta battery used to be?

I'm thinking that a circuit trace possibly could have been severed, when the Varta was removed?

Double D · « **Reply #10 on:** January 18, 2024, 02:44:49 PM »

Sure thing.

dailey · « **Reply #11 on:** January 18, 2024, 03:05:48 PM »

Attached is information on the power supply pin-out. Also some info on Pin-7 output.

Double D · « **Reply #12 on:** January 18, 2024, 03:12:24 PM »

Thank you!

Stayouttadabunker · « **Reply #13 on:** January 18, 2024, 04:16:06 PM »

Yeah...could be a bad PSU?
You have some info from Daily on where to check.

Good photo you've posted of the area where the Varta used to be...looks like clean cuts.

Double D · « **Reply #14 on:** January 18, 2024, 04:47:57 PM »

Thanks for opinions. I truly appreciate all of your inputs. I am learning from each of you. I’ll post the progress and a summary to help those who have the issues. When I solve it…

Double D · « **Reply #15 on:** January 24, 2024, 05:03:27 PM »

Got a new power supply and it checks good for voltage on all black red and orange. Purchased an MCU enhanced and installed after loading my chips. Still get the red led and amber led only this time no NETPLEX down flash. Help!

Double D · « **Reply #16 on:** January 24, 2024, 05:11:47 PM »

I do have new mother board since the power supply checks out and the replacement MCU was tested before sent to me, and is duplicating the same thing the old MCU did is it likely the issue is in the mother board somewhere?

Stayouttadabunker · « **Reply #17 on:** January 24, 2024, 06:03:35 PM »

Bad software maybe?
Leg folded under chip body in socket?

The main circuit board holding the software chips is called an MPU
The P stands for Processor.

Double D · « **Reply #18 on:** January 24, 2024, 07:15:15 PM »

Software ran fine in old board. I checked the pins on the chips I installed on new board. Same results. Thinking it may be backplane / mother board?

lookes · « **Reply #19 on:** January 25, 2024, 08:07:17 AM »

Double D your inbox is full. Contact me at slots@lookelectronics.com

John-

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Author Topic: Flashing NETPLEX link is down. (Read 996 times)