Oh no! You’ve got a broken knob on your poker machine’s control panel. Relax, you got this. The actual soldering part of the job is a piece of cake. What’s a lot trickier is finding the exact parts you need to fit in the holes, and fit under the metal bar. The challenge is, that there are thousands of variations on these parts and each one has a cryptic part number as shown on this datasheet. Ugh.

But fear not. I spent 3 hours on the internet looking at part numbers, so you don’t have to. First up, there are 2 different circuit boards that I know of. To identify which one you have, determine whether you have:
Version A: Smaller knobs (10 mm) mounted on three prongs

Version B: Larger knobs (15 mm) mounted on four prongs

Once you’ve got that all figured out… Here’s your parts to order. Each part is less than a dollar, so you’ll spend more on shipping than the actual components. It’s best to replace all five at once, so that you have a nice looking, long lasting repair. Also note that the knobs are sold separately from the potentiometers, and that you’ll need two of the 1K pots. Happy soldering!
Version A – 10mm
| Part No. | Function | Description | Qty | Note |
|---|---|---|---|---|
| 481 | H-Size | 531-PT10MV-10K PT10MV10-103A2020 10Kohms 10mm Rnd Top | 1 | |
| 482 | V-Size | 531-PT10MV-500 PT10MV10-501A2020 500ohms 10mm Rnd Top | 1 | |
| 483 485 | V-Pos Gain | 531-PT10MV-1K PT10MV10-102A2020 1Kohms 10mm Rnd Top | 2 | 2 Required |
| 484 | H-Pos | 531-PT10MV-20K PT10MV10-203A2020 20Kohms 10mm Rnd Top | 1 | |
| Thumbwheel | 531-5034CR 5034CR CREAM THUMBWHEEL | 5 | Sold Separately |
Version B – 15mm
| Part No. | Function | Description | Qty | Note |
|---|---|---|---|---|
| 481 | H-Size | 531-PT15NV-10K PT15NV18-103A2020 10Kohms 15mm Rnd | 1 | |
| 482 | V-Size Gain | 531-PT15NV-500 PT15NV18-501A2020 500ohms 15mm Rnd | 1 | |
| 483 485 | V-Pos Gain | 531-PT15NV-1K PT15NV18-102A2020 1Kohms 15mm Rnd | 2 | 2 Required |
| 484 | H-Pos | 531-PT15NV-25K PT15NV18-253A2020 25Kohms 15mm Rnd | 1 | Replaced 20K with 25K |
| Thumbwheel | 531-JPEPL5371IN JPEPL5371IN Thumbwheel knob PT15 | 5 | Sold Separately |
Here’s the finished repair. Hello, handsome!


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