Omega Tek chasis not going from step 2 to step 3

[Kekko]

So sweep goes down and lcd is showing number 2 but after that nothing hapens. If i quickly press zero-button so it goes from 2 to 3 it's makes the cykle normally. I have tried with other board and tried the whole chasis on another machine but no help. This started after i tried to clean contacts whit Contact Cleaner spray...

[Louie_IV]

Try cleaning the contacts on PR2, PR3, and PR4 with an ignition file or contact burnisher. I have also had problems with spraying contact cleaner on the PR relays. Sometimes it actually makes the chassis worse! I think what happens is it actually washes dirt INTO the contacts. I only spray contact cleaner on the stepper relay.

Louie

[toon30s]

I have had a similar problem with an OT chassis, turned out to be a bad rectifier. I would clean and inspect PR 2, voltage to run table contactor goes through #2. Let us know what you find!!

[eViL14U]

i have also had issues with the high and low voltage side of the J strip to loose proper connection being pushed out with chasis swapping. be sure main power is removed before checking!

[thunder_strikez]

On a MK30 Omega Tek chassis if you do not have a ground path on J30
to TA2 switch you will not get time delay on step2.

CK for a connetion from L6-0 on OT borad to J30.

Dwight

[thunder_strikez]

[Kekko]

Allright, so i just cleaned PR2, PR3 and PR4 again, checked connetion from L6-0 on OT borad to J30 without no help. All the connections in J-box should be ok also. Table runs normally from table micro. What is the easyest way to test rectifiers? And btw it's the same broblem on 2nd ball when it should change for step 9 to step c nothing hapens...

[thunder_strikez]

If there is a wire or wires on J28 in chassis, ck for a connection to L2-0.
If no wires on J28 they have been moved to J29.
The original wire off of J29 should be tape or if there are 2 wires they should have
been spliced to each other this will make the connation from PR2 to PR4.
Ck for a connation on OT board L4-9 to L6-2 to L6-9 these connection are made
on contacts on PR2 and PR4.

Dwight

[Louie_IV]

Well, if this were a stepper chassis, it would be a no timer run problem which is usually a PR2 Normally-Closed contact problem. You might want to visually check the Normally-Closed contacts on PR2 and make sure they are making good contact. To test with a meter, put one lead on L4-2 and one on L6-2 and push PR2 down and up with your finger. You should see continuity with it up and no connection with it down.

Kind of grasping at straws, but I guess one thing at a time.

Louie

[Kekko]

Allright, so there is no wires on J28, but as you said there is two wires in J29 and connection between J29 - L2-0. No connection between L4-9 - L6-2, connetion between L6-2 - L6-9.
And Louie, did you mean L4-3? Because there is only L4-0, L4-3, L4-9 I think?
And should L4-3 be connected to ground?

[Kekko]

Problem solved so far! So it really was some dirt on Normally-Closed contacts on PR2 it took a litle work wih fine sandpaper to clean it. Contact looked to be fine but when i tried it with meter i did get just some very poor numbers.
But now when table is coming to 0 decree position contactor doesen't open fast enought so it goes over it and falls on pins again...

[thunder_strikez]

L4-9 to PR2 terminal 7 NC contact to L6-2.
Looking at chassis from J strip side left side of PR2 wires 3 and 4 down from top.

Dwight

[Kekko]

I need to check those when i'm getting work tomorrow.
And btw thanks everybody for help!