bally s9000e all doors open trouble

[arnold]

I just started getting a call attendant error. It tells me all doors are open and can't clear.  I tried reseating mph shelf. I checked all door switches.  Any troubleshooting assistance would help.  Could backplane or cup shelf just fail all of a sudden.  Thanks in advance. 

[rokgpsman]

Does your machine's main circuit board have a battery that has leaked or gone bad?

[arnold]

Batteries good. No leakage

[arnold]

Now get this.  Left game sitting for hours with open door errors.  Come back main door and all others have cleared but d-door error is still in alarm.  Does an s9000e upright have a drop door.  If I open the bottom front the belly door comes back in.  If i open cpu l-door alarm comes in.  the 3 main doors make the m=door alarm activate.  Where is the drop door?  Thanks.  The game is bonus times if needed.

[rickhunter]

I think there's a jumper plug for the drop door.  I will have to take a look when I get home and see.

[Sunrise Side]

There is a lot of security switches on the s9000. Not needed. Bypass all the switches except for the main door. The top cabinet door, the reel door,  the belly glass door, the cash can door, there is 2 switches in series on the MPU.

[Slots4me]

There is a lot of security switches on the s9000. Not needed. Bypass all the switches except for the main door. The top cabinet door, the reel door,  the belly glass door, the cash can door, there is 2 switches in series on the MPU.

I am having the same problem on a couple Bally Alpha
m9000
I have spliced all switches together
Does not clear any door errors
Four machines all have open door error
Replaced mpu & backplane batteries
Cleared system
Pins on mobo  look good no bent pins
Mpu pushed all the in..
I cannot figure out any help would be great
OPEN DOOR MSV