| Arcade Collecting > Restorations & repair |
| Hydro Thunder Restoration - Steering Issue Help! (Solved!) |
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| Shaybe:
--- Quote from: DudeRegular on August 03, 2017, 09:42:12 pm ---Video card causing the steering to go doesn't sound too likely honestly. --- End quote --- You're probably right. I think the issue they had was with the control buttons, which have been intermittent for me. I think my machine probably has more than one thing causing issues, was hoping everything would just be because of a card not properly seated. I reseated the video card and even changed slots in the pc, no luck. But there is one pin missing on the connector***, so maybe that is causing intermittent connections? I'm running out of ideas on the steering and throttle issue. I know it's not the pots because I just bought the throttle from a working hydro thunder ***Update - Turns out the "missing pin" from the DB15 connector to the video card is one that is not used. So much for that theory*** |
| Shaybe:
--- Quote from: PL1 on August 03, 2017, 11:44:11 am ---- Power off resistance check from tab 1 to tab 3 should read 5k IIRC. - Power off resistance check from tab 1 (or 3) to tab 2 should read around 2.5k with the axis centered and vary as you move the axis. - Power on voltage check from tab 1 to tab 3 should read 5v IIRC. - Power on voltage check from tab 1 (or 3) to tab 2 should read around 2.5v with the axis centered and vary as you move the axis. --- End quote --- Hopefully I can try these measurements tonight. I'm looking at the diagram from the manual and see +5V Throttle, Throttle Sense, and Throttle Ground (Same for steering pot). Wheel and Throttle sense both go to JP7 on the Diego Board. Anyone know what sort of signal sense is sending? I can try to pull that plug off and measure those pins to make sure the signal is reaching, but I don't know what I'm measuring for! |
| PL1:
--- Quote from: Shaybe on August 04, 2017, 09:48:25 am ---I'm looking at the diagram from the manual and see +5V Throttle, Throttle Sense, and Throttle Ground (Same for steering pot). --- End quote --- Yes, Sense is the middle tab ("wiper") on the potentiometer. --- Quote from: Shaybe on August 04, 2017, 09:48:25 am ---Anyone know what sort of signal sense is sending? --- End quote --- A potentiometer acts as a voltage divider. --- Quote from: PL1 on February 15, 2014, 04:14:51 pm ---The black resistive element is a resistor. 5v on the top tab and ground (0v) on the bottom tab allows you to select a voltage (a.k.a. "potential") between those values. A wiper arm slides over (wipes across) the surface of the board, making contact between the silver ring in the center and a point on the resistive element. The contact point is the bump on the right side of the wiper. When you center the knob, the arm makes contact at the green bar, giving you 2.5 volts on the wiper. (assuming it is a linear pot) When you turn the knob to the blue bar, you get 4.5 volts on the wiper. If you reverse the 5v and Gnd tabs, green will still give you 2.5v and blue will give you 0.5v. --- End quote --- --- Quote from: Shaybe on August 04, 2017, 09:48:25 am ---I can try to pull that plug off and measure those pins to make sure the signal is reaching, but I don't know what I'm measuring for! --- End quote --- If you pull the plug off, it defeats the purpose of doing the power-on checks. Check at the potentiometer tabs to see if you have: - 5v on tab 1 (or 3?) - Ground on tab 3 (or 1?) - Voltage on tab 2 that is controlled by the position of the potentiometer. Those readings indicate that the pot is working correctly and that the problem lies elsewhere. Scott |
| jennifer:
Back up a bit... Games like that were subject to physical abuse, most likely you would be able to see manifestations of this in bent and cracked steering brackets, PL1 is not wrong, But how we got there should be understood ...stress... Those C/pots absorbed considerable physical energy over time and still may read ok but not-so much in certain positions. (Honeypoo would scope them) but that's just me trying to save the good ones. Because... Here is the thing, they are really hard to find anymore,( the real carbon disk) and when you do quite spendy. The plastic pregged cheapos are junk, Don't waste your time (IMHO). |
| PL1:
I totally agree on not using cheap pots. :cheers: Long-life versions by Allen Bradley (very hard to find, expensive) or Honeywell/Clarostat (RV4 series, easier to find, less expensive, depending on the model you may need to cut the shaft to the proper length and add a flat with a Dremel cutoff wheel) are great choices IF you have worn-out/damaged pots. In this case, the fact that there is no response at all from the pots suggests that it probably isn't worn pots. Scott |
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