No Spotting

[Mark_S]

82-70 MP chassis

Problem is solenoid won't activate on spotting, not even slighlty.

The problem started yesterday, we changed the solenoid then it worked for a while. One of the other mechanics then changed the spot relay in the chassis. Again in worked for a while.

My next step is to check the cams. Does anybody have any other ideas ?

[8270_Wang]

Re: No Spotting

Check C1 and C2 plug for connections.

Wang

[triac]

Re: No Spotting

Swap your chassis with another machine.

If problem moves, it would indicate you have a bad SP socket, relay, or the connection to socket or a burnt pin in C1 receptacle (C1-36Y).

If problem doesn’t move check for continuity from solenoid wires going to TS-17 (white) & the other wire going to TS-3 (black). Then check the continuity socket (C1-36Y) in the C1 plug to TS-3. *Note…The socket itself could also be burnt inside and give a false reading when doing a continuity check.

The solenoid wires are high voltage. Kill the breaker on the wall before doing this continuity test.

Triac

[Tall Paul]

Re: No Spotting

Check the C1 plug terminal 36y . That wire goes to TS3 and then to spot solenoid. Good luck.

[Mark_S]

Re: No Spotting

Well I will bear all that in mind. At the moment it is playing on it's own. Were now on 3.5 games. I remember someone once had this problem it the uk. Changing the master circuit breaker on the rear control panel solved the problem. At first I was dubious but the information came from my regional mechanic, who has worked on 82-70's since they were first used in the uk.

As it's now 10.20pm in the uk, and tomorrow is my day off. It is unlikely that I can post back till sunday AM.

So perhaps if someone knows why this works, or can come out any say replacing the breaker is just a coincidence and the problem is not fully fixed I'd be grateful.

Many thanks for the quick response from the gentlemen above. You have given me something to work with on sunday, if the problem is still there.

[Kat]

Re: No Spotting

The BE CB is wired into the Spot Solenoid circuit. These crap out quite frequently. Take suspect unit apart and you will find some burn and/or broken legs inside.

[Kingram]

Re: No Spotting

Originally posted by hmmmm:
82-70 MP chassis

Problem is solenoid won't activate on spotting, not even slighlty.

The problem started yesterday, we changed the solenoid then it worked for a while. One of the other mechanics then changed the spot relay in the chassis. Again in worked for a while.

My next step is to check the cams. Does anybody have any other ideas ?

<font size="2" face="Verdana, Helvetica, sans-serif">I had this to happen to me on a 90. Someone changed the plunger return spring on the solenoid. The spring was too strong and the solenoid would not pull in to spot pins, it didn't hum or show any indication that it was trying to operate, but when we went to a weaker spring it started to operate again. Also check the rest of spotting mechanism for a bind or rubbing on something. Unplug the wires from the solenoid, put your meter on the wires, cycle the machine and check for proper voltage when spotting should occur.

[amfpinboy]

Re: No Spotting

Did we rule out the table coasting past zero? Does the table run during the spot cycle? Will it spot on a strike cycle and not on a second ball cycle? Shuttle stop bolt gap ?

[Mark_S]

Re: No Spotting

Thank's to all,

It's now sunday evening and the machine is still working fine. So it was the breaker on the rear panel.

Just to confirm the problem we had, was the solenoid was not activating at all. No voltage was present. But if you turned the machine off for a while, it would work for a short period.

Don't know about you guys but when something breaks on me I like to see the broken part in my hand. These "now I'll work, now I won't fault are a pain"

[maister]

Re: No Spotting

Hi Laurie from AMF here. the CB switch in the back end control box allows the solenoid TS17 to be powered up .To test if this is the fault, turn off , take the wires from CD on the CB switch and join them together.These do break down. You can operate a machine with CD disconnected , but you do not have the protection of the switch.Where are you in the UK.I am in Scotland and can be contacted here or thro amf.
Best wishes.
Laurie.