Anyone else having issues with twin slots on the Model X board?

arcadeelectronicscircuit boardpower supply

Registration:
14.05.2021
Messages: 923

Trinity_M Topic author

03.01.2025 15:29

I'm trying to upgrade my vintage arcade cabinet, and I've hit a snag with the main circuit board. The manual mentions that the power input uses a pair of twin slots, but when I try to connect the new power supply, it seems like only one slot is registering a proper connection. I've checked the wiring multiple times, and the terminals look fine. Has anyone successfully replaced the power module on this specific Model X? I'm worried I might be misreading the diagram or maybe the slots themselves are worn out. Any advice on troubleshooting this connection would be greatly appreciated.

15 Answers

04.12.2022
Posts: 418

HyperNova

08.03.2025 17:45

Check the polarity first. Sometimes the power supply needs to be flipped around, even if it looks right.

20.08.2022
Posts: 1476

OverClock

27.03.2025 02:10

I had the exact same issue on a Model X. It wasn't the slots, it was a loose ground connection somewhere else on the main harness. You need to trace it back to the primary power bus.

12.03.2023
Posts: 320

CyberNinja

25.07.2025 18:19

Did you try cleaning the contacts? Use electrical contact cleaner and a small brush. Sometimes oxidation is the culprit.

27.06.2024
Posts: 913

Burke_C

02.08.2025 10:30

Long post: Before you assume the slots are worn out, I strongly recommend checking the input voltage requirements of the new power supply against the original specs. Many modern supplies are slightly different in output ripple or voltage stability, which can trick the board into thinking a connection is incomplete. Also, make sure the new supply is rated for the maximum current draw of the cabinet, especially if you are running multiple peripherals. A marginal power supply can cause intermittent connection failures that mimic a bad slot.

13.02.2025
Posts: 866

Ankor_C

23.08.2025 15:59

Try jumpering the slots temporarily. Just to confirm if the board itself is rejecting the connection.

16.07.2022
Posts: 637

OmegaZero in response

31.08.2025 11:22

Reply to user 4: I agree about the voltage. Also, check the fuse rating. If the fuse is slightly undersized, it might trip intermittently under load, making it seem like the connection is bad.

26.08.2023
Posts: 161

Lope_C

04.09.2025 21:10

The slots themselves are usually fine unless the cabinet has been dropped. It's usually the wiring harness that gets damaged over time.

09.02.2023
Posts: 341

CyberNinja

08.09.2025 18:52

Short and sweet: Check the ground wire.

10.11.2024
Posts: 1413

Enemy_C

10.10.2025 06:28

I suspect the problem is in the power module itself, not the slots. Have you sourced a known good module from a board that worked previously? Sometimes the internal connections to the slots fail.

07.03.2024
Posts: 987

Ally_C in response

21.10.2025 09:14

Reply to user 2: I found that the ground connection was the issue too. I used a multimeter and found a significant resistance reading (way higher than 0.1 ohms) between the main ground point and the slot area. That was the fix.

28.07.2022
Posts: 95

Settlement_Need

12.11.2025 18:59

Make sure the power supply is grounded properly to the cabinet chassis. This is crucial for safety and proper signal integrity.

23.02.2023
Posts: 1026

NexusPrime

17.12.2025 14:59

If you are using a specific model of power supply, please list it. Compatibility is everything with vintage arcade boards.

06.10.2024
Posts: 334

Echo_404

02.01.2026 03:10

I had to replace the entire input connector assembly, not just the slots. It was a whole unit failure, not just the contacts.

16.07.2024
Posts: 1226

FireStorm

29.03.2026 09:59

Did you verify that the wires going into the slots are color-coded correctly according to the original diagram? A simple swap can cause failure.

02.03.2024
Posts: 1385

Partner_C

29.03.2026 13:58

Try powering it up with a variable bench power supply first, just to isolate the board from the main cabinet power source. This helps confirm if the board is the problem or the cabinet wiring.

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