If you are seeing this you are not logged in to Bowl-Tech. Remove this notice by Registering or Logging in
By your continued use of this site you agree to the following.
You are over the age of 18 and have had supervised training in safety and operations of the equipment you work on.
Bowl-Tech does not warrant or guarantee the accuracy of information found on this site. Bowl-Tech, its officers, site Admins or Moderators will not be responsible in the case of losses financial or otherwise as a result of use of ANY information on this site.
Bowl-Tech is not a substitute for proper training on bowling equipment maintenance. You will seek personal training from trained professionals within your center with regards to safety & maintenance practices while working on bowling equipment.
Posts on the site are made by registered members and each member is responsible for the content and accuracy of their posts.
If you can not agree to any of these terms of use above or are not at least 18 years of age you are asked NOT to visit Bowl-Tech or utilize its content. To visit the Bowl-Tech Terms of Service and Rules CLICK HERE
Please join our community. It is easy and gives you additional access to forums and other tools. CLICK HERE to join
Hi,got a teaser here!
M/C started to give a constant sweep cycle without stopping.
On investigation found it to be the M.P. chassis.
We have O.O.R. control boxes wired in to the m/c`s to give automatic sweep reverse on the event of an off spot pin,with the table returning to 0 degrees.
I arrived on site to find that the O.O.R. box was burnt out with the M.P. chassis giving constant cycle.So I transferred the M.P. chassis to another m/c to find that the fault had transferred.
I assumed it to be the M.P. chassis at fault.So I changed the sweep A.B.contactor-still the same.
I then checked all the pins on the C1 circuit-all ok and positioned correctely-still the same.
C.B.1;C.B.2;C.B.3 all ok.
Al relays ok:-S;M;M2.
The chassis is a 9800 with a mark v p.c. board.
All interconnecting wiring looks ok.
Was it the O.O.R. box shorting out, to cause the fault on the m.p. chassis or visa versa?
I`m puzzeled!!!
Yeah Tablejam,I forgot to mention I also changed the p.c. board over to elimanate it.
I did check the sweep button on the side of the chassis,Jim.It`s ok.
Now you see i`m running out of options!
It`s the first time in my 15 years that i`ve come across this fault.You think you have everything covered then a fault like this raises it`s ugly head!
The OOR device probably piggybacks the sweep run output of the board (which also connects to the sweep run switch and runs through the sweep switch back to the contactor).
I guess if something catastrophic happened to the OOR device, it could do damage to the sweep output of the board. It would have to be pretty bad though (like putting 220V up the sweep output). But I expect that would equally damage the contactor too.
Another shot in the dark:
Does the other machine (on which the chassis now sits) also have an OOR device? If so, can you tell if it's activating? Can you disable it (turn it off)? I'm wondering if the problem is actually the offspot input and not the sweep output causing the otherwise working OOR device to make the sweep run. Is the sweep running backwards?
Thanks for the replies!
The chassis in question has the fault described,no matter what m/c it is connected to with a fully functional O.O.R. sw`connected to that m/c.
I just don`t know whether the cooked O.O.R.sw`caused the fault on the chassis or the other way round?
I have since fitted a new O.O.R sw` to the problem m/c with a different M.P. and everything works fine.
So I still have this M.P. chassis with continuous sweep run,having changed the p.c. board;contactor;3 relays;all C1 pins checked & C2;CB1,2,3 checked and sweep button,table,and cycle buttons checked.
The only thing I have`nt changed is the table contactor,but I would`nt have thought it would have affected the sweep circuit?
Will be on the fault tomorrow,so will keep you posted if I fall on it!
is the sweep contactor pulling in when you get the continous sweep?? need to acertain if this is a low voltage or high voltage fault... (most likley low, but better to eliminate the easy forst)
On our M.P's we have diodes protecting the board they are located under the M.P board. Try checking these to see if one of them has gone there should be 3 one for each motor. Worth a shot.
I don’t have MP chassis, but I do have the MP schematics.
If the “S” relay is energized during a continuous sweep, I see 1 of 3 possibilities.
1.) Defective sweep switch on the chassis. Disconnect the wires to this switch and do a continuity check across the terminals without pushing switch….you should have no continuity.
2.) Defective varsitor going to ground (earth) coming from the relay coil A2. Although it is supposed to go to ground, there should be a lot of resistance or no continuity to ground. Disconnect and retry chassis.
3.) C2A-21D has shorted to ground. You can do a continuity check on this to ground, but if either items 1 and 2 were grounded….they would need to be disconnected, because if either the varsitor or sweep switch were grounded, you would get some continuity.
Items 1,2 and 3 are all tied together. A grounded wire from either component or the component being defective will cause a continuous sweep.
I suspect item 2 (the varsitor) to be the culprit by the circumstances that you described.
Thanks for the excellent info guys!
I checked the diodes as Fudge mentioned and found that the one that comes from the relay coil A2,as Triac mentioned was at fault!
There was total continuity between the varsitor and ground so I dissconnected it as Triac mentioned and then tested the chassis.
It got rid of the continuous sweep fault!
New problem has now arose on the m/c that give the original fault on the M.P.!
A good M.P. that was fitted a few days ago started to give the continous sweep problem again!!O.O.R.sw` ok along with everything else previously tested.
So I preceeded to test the varsitor that was defective on the other M.P. chassis to find that this one was also defective!
I then disconnected it like I did with the other one and tested it on a different m/c-puff of smoke from the p.c. board!
On checking the p.c. board the resistors no`s 67 and 68 where frazzled!
Not to sure what else might be now defective,but will look into replacing the resistors for now!
Getting back to the problem m/c.The only other thing I can see that is iffy is a buzzing shuttle solenoid.
Surely can`t be owt to do with that!
I`ll keep plugging on!
Thanks again for the input guys!
The OOR device is good on the problem m/c.I changed it last week when the other one cooked!
I personally tested it yesterday and it works fine.
I think I might dissconnect the OOR device on this m/c only to see if fault dissapears and then take it from there.
I only dissconnected the varistor temporarily to see if fault dissapeared on problem chassis,as Triac stated in no.2 suggestion.
Was by no means going to leave it dissconnected permanently!
Ok, I just had one of my company's centers in Florida reach out for help with this issue, and I wasn't able to help them over our chat, so I'm hoping you guys can help shed some...
What causes the trip rocker arm to not line up with the trip rod? Carriage tubing is not bent and all eccentrics are brand new.
I understand I can bend the rocker arm a...
Just wondering if this is the normal way that these boards go over time? Am i missing something?
Pit curtains are in "reasonable" condition if that means anything...
Hi guys, got a few of these Lewus solid state start switches and wondering if we could make use of them on our combi motors. I've seen they aren't recommended for combi motors...
I have a machine that has broken the cam follower arm for the deck lowering hook on the 2 to 1 twice in a couple weeks. I've overnighted the part so i can change it tomorrow....
Working...
X
We process personal data about users of our site, through the use of cookies and other technologies, to deliver our services, personalize advertising, and to analyze site activity. We may share certain information about our users with our advertising and analytics partners. For additional details, refer to our Privacy Policy.
By clicking "I AGREE" below, you agree to our Privacy Policy and our personal data processing and cookie practices as described therein. You also acknowledge that this forum may be hosted outside your country and you consent to the collection, storage, and processing of your data in the country where this forum is hosted.
Comment