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8270 pin setter problem

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Adsense Classic 1

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  • 8270 pin setter problem

    Hi I have a pin setter that acts crazy. It will go fine for a while then all of sudden it goes to pick up the pins and just stop right at the top of the pins.
    At first we thought it was an out of range but no the pin setter just stopped. we have to crank thw pin setter up and it goes for maybe a few shots and stops again.
    If we turn it off and not use it for a while it will go a whole game before it stops. Anyone have any ideas. thanks

  • #2
    1 TA1 micro switch is out of adjustment, or needs to be replaced
    2 Sweep is drifting when it goes to guard causing an interlock
    3 Sweep / table interlocking cams are out of adjustment or micro switches need to be replaced
    A person who never made a mistake never tried anything new.
    - Albert Einstein

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    • #3
      Thanks for the info

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      • #4
        How do you stop a sweep from drifting on a 8270

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        • #5
          Where is it drifting? Is it just at 0 or everywhere?

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          • #6
            yes only there

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            • #7
              With your crazy lane, have you checked to see if the off spot switch is faulty, out of adjustment or a wire has come off and may occasionally ground on the machine making it think there is an off spot??
              AS REQUESTED....The all new and VERY improved "super cool" Pin_Head with super hip shades.....

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              • #8
                Are you sure it's at 0 and not first guard? Sounds like your having an interlock issue which means the sweep and table are trying to occupy the same space.

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                • #9
                  I’d also check your capacitors in the wireway. Does it start coasting straight away from the first time it’s running or when the motor starts to get warm?

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                  • #10
                    Originally posted by exMech View Post
                    Are you sure it's at 0 and not first guard? Sounds like your having an interlock issue which means the sweep and table are trying to occupy the same space.
                    its the guard position. it comes down hits the lanes and moves toward the pins. it does not go under the pins

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                    • #11
                      Originally posted by Ausweegie View Post
                      I’d also check your capacitors in the wireway. Does it start coasting straight away from the first time it’s running or when the motor starts to get warm?
                      Usually its a games and a few frames before it starts, Than after that it could go two, three frames before it does it again.

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                      • #12
                        If your sweep is heading toward the pins you are probably interlocking. If the sweep travels to far, SC will open and then when TB opens as the table moves downward the machine will interlock and shut down. You can confirm this is what is happening by checking the SC switch when this happens. Pull the normally open wire off and check for continuity between normally open and common connectors on SC (the switch not the wires). If the switch shows it's open then you are interlocked. Either SC or TB needs to be closed to prevent interlocking. The TB will open when the table drops and that is why SC needs to stay closed. If SC isn't open then you're not interlocking and we'll need to look elsewhere.

                        As the sweep motor is de-energized, the motor is turned into a generator to help slow it down and stop it. The energy generated is fed into the capacitors so the capacitors need to bee in good shape and associated wiring need to have good connections or else the circuit will be open and the generation process won't help slow the sweep down and it will overshoot its stopping point like you are apparently seeing. The resistors provide a drain for the capacitors so they are able to take the generation load. If the capacitors don't discharge after motor start then the braking won't happen properly.

                        Start by checking SC adjustment. Then check your capacitors and resistors for the sweep and make sure all the wires have good connections. Let us know if you need further help with this.

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                        • #13
                          Originally posted by exMech View Post
                          If your sweep is heading toward the pins you are probably interlocking. If the sweep travels to far, SC will open and then when TB opens as the table moves downward the machine will interlock and shut down.
                          That's not true. If SC opens at first guard, the sweep and table will run at the same time when the table feels for pins, which is where the interlock occurs. The sweep would make it to the rear of the pin deck when TB opens causing an interlock. That's not the condition he described in his op. Unless I'm mistaken, about a lot of things.
                          There! Try to NOT work now!

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                          • #14
                            Swap your sweep and table stators over and see how that goes

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                            • #15
                              Bill:

                              If you take a look at the schematic for the sweep and table relays and also the interlock for the machine there are several observations to be made.

                              1) The interlock consists of the NO contacts of SC and TB so if you reference the cam charts at the bottom of the schematic you have to reverse what is shown for active and non active. But if you reference the switches as shown in the schematic (reference below) these are the active ranges for the normally open contacts i.e. when these contacts are closed.

                              2) The SC and TB switches do not dictate when the sweep and table motors run. They simply provide a disconnect means when something goes wrong. When and if the table or sweep motor runs is dictated by the computer by providing ground to the S and T relays.

                              3) Irregardless of the state of SC, the computer will stop driving the sweep motor around 66 degrees when SB reports a state change. Unless there is a malfunction such as a stuck S relay, there is nothing to drive the sweep to the rear of the pin deck. SC doesn't dictate this.

                              4) If the sweep stops at first guard (66 degrees) as it should then SC will remain active since it doesn't change state until 86 degrees. This allows the table to complete its cycle even through 105 degrees when TB becomes inactive. However, if the dynamic breaking fails and the sweep travels through 86 degrees (even though the computer stopped driving it at 66 degrees) then SC is no longer active. 86 degrees is before the sweep reaches the front of the table so it may look like its at 1st guard at a quick glance. Because TB is still active the table will run until 105 degrees (table just above pins) when it also becomes inactive. Since TB and SC are both inactive at this point, the interlock occurs and the machine shuts down. The sweep is in front of the table and the table is just above the pins.

                              5) The original post said: " it goes to pick up the pins and just stop right at the top of the pins." This is exactly what I described in #4 above with the sweep stopping for 1st guard after 86 degrees.

                              6) You said: "That's not true. If SC opens at first guard, the sweep and table will run at the same time". This is inaccurate. Since SC and TB are in parallel only one needs to be active for the table or sweep to run. Since TB is still active, the state of SC is irrelevant until TB changes state at 105 degrees. Again, it is the computer that dictates when S and T run, not SC.

                              7) You said: "The sweep would make it to the rear of the pin deck when TB opens causing an interlock." Again, this would only happen when a failure such as a stuck S relay caused the sweep to keep driving. The computer will stop driving the sweep when SB reports the sweep is at 1st guard (66 degrees).

                              8) You said: "That's not the condition he described in his op." As pointed out in #5 above, what he posted is what I described. The sweep doesn't have to be all the way back for an interlock to occur, just past 86 degrees and with the table past 105 degrees (just above the pins).

                              Hope this clarifies things. I am often mistaken about a lot of things so if you still disagree, please let me know.
                              Attached Files

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