Open S (stacker) error BB1

[rjpohl]

I can't clear the Stacker open error. 
It's a WMS BB1 with reels and the small screen lower right side of door.  I was able to perform a clear and set it back up but can't get the stacker open error to clear.  The button and back of BV housing appears to be OK.  I read that I could ground pin 4 on plug P10 but that didn't clear error.  If I can't bypass at plug p10 would that mean CPU or MB is bad.
Machine is a 45 minute drive away so I'd like my next trip to be the last.
Any suggestions?

can I use the CPU in pic on BB1 with the 19" screen?
Thanks
Bob

[Stayouttadabunker]

The stacker optical prism in the cashbox may be dirty.
I'm assuming you have the gray/yellow-handled JCM CashFlow cash boxes?
If so, what happens is that the bill pusher mechanism inside the cashbox has an optical prism that allows infrared light to go thru so the head knows that the stacker has returned to the home position.
If the prism is dirty with dust, the computer thinks that the stacker is "open" because the light doesn't get all the way thru the plastic optics.
There's a couple of ways to clear this error.
One is to carefully position the straw of compressed directly onto the prism and blow off the dust.

Two is to rotate the gears just right with one hand, while the other hand reaches down inside behind the stacking unit and rubs the dust off the prism with a fiber towel normally used for cleaning prescription eyeglasses.

Three is to throw the whole cashbox into a washing bin with warm soapy water and hung dry.

Four is if you're lucky that the stacker has two Philips screws that you can remove to slide out the stacker to clean the prism.
Often though, instead of Philips screws, they use some sort of metal screws with a rounded rivet-type head that's very hard to get off.
You have to tap the top of the two rounded screw heads with a metal center punch, then drill a small hole into the top of the heads with a 3/64" drill bit.
Then I stick in a small reverse thread extractor, pull out the 2 screws, and the whole stacker mechanism slides right out of the cashbox.
Later after cleaning the prism, I replace the 2 screws instead with 2 small Philips wood screws of the same size.
It holds the stacker in the cashbox perfectly.

Also, sometimes there's a small black 6-pin connector to the right of the bill box on top that has a jaded connection.
I find that if I pull it out and spray the pins with some De-Oxit electronics contact cleaner, and push it back on, the pins get better contact, and the stacker error goes away.

[rjpohl]

Thanks for the info on the MEI cashbox but I have the WBA BV setup.  I read a few more post about the stacker error and so that in some cases the cpu may need to be reseated to MB.  I did have he cpu out and maybe I didn't get it seated properly. 
Bob

[Stayouttadabunker]

okay, on the WBA's, you might want to blow out the sensors with compressed air, run the waffle cleaners thru, and then run the black-n-white calibration paper a few times? That's the easiest thing to do really.

The belts are probably dirty, maybe even becoming hardened somewhat and not taking the bills down far enough into the box to set off the stacker encoder end sensor.
I'd slide out the unit and pop open the cover and clean the belts a bit.

There is a #3 dip switch stacker test activated with the #8 dip that you can run but that really doesn't fix it and dip switch tests are not what you want to do at the guys house anyways, I'd just bring a working extra BV unit and swap it out...cleaning does better, but only back at the shop.
The service manual does mention checking the harness connector for bent pins. Maybe bring another harness?

[rjpohl]

I thought the Door Open S error was the white cherry switch behind the cash can.  I also thought I saw a post that said to ground pin4 on P10 to bypass S switch.  I tried this but it didn't work. 

When I started on the machine the guy said it had been working but after sitting a few months it wouldn't set up.  Batteries were dead so I changed and then performed a clear and setup.  Only error after setup is the open S.  Since it he said it worked before I may I just didn't get cpu seated tightly.  Also read a post where the same problem was a bad MB.  I think I'll try to run down a MB before heading back. 
Thanks