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(Topic ID: 283245)

Switch Issue on WPC - Power Driver Board

By PinballGurus

3 years ago



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  • 7 posts
  • 4 Pinsiders participating
  • Latest reply 3 years ago by DumbAss
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Popeye switch matrix (resized).JPG
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#1 3 years ago
OP
 
JJN

PinballGurus

Pinball Gurus

US Salem, OR

5y 47,550 732 34

So I have a Power Driver Board on a WPC machine that is giving me switch issues saying switches are closed when they are not. I’ve put this board in two different machines and get basically the same switch issues... on Popeye it says check switches 81, 82, 83, 41, and 63. While on Doctor Who it’s switches 43, 51, 53, 61, and 63. I’m pretty new to these WPC machines. It’s not an entire row or column that is out so I’m not sure where to start at this point... Ideas appreciated. Thanks in advance.

Here’s what it does in the Popeye machine:

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#2 3 years ago
 
BAM

Manny65

Pinside+ Frequent

AU Melbourne

7y 108K 3,628 16 12

OP
Quoted from PinballGurus:

So I have a Power Driver Board on a WPC machine that is giving me switch issues saying switches are closed when they are not. I’ve put this board in two different machines and get basically the same switch issues... on Popeye it says check switches 81, 82, 83, 41, and 63. While on Doctor Who it’s switches 43, 51, 53, 61, and 63. I’m pretty new to these WPC machines. It’s not an entire row or column that is out so I’m not sure where to start at this point... Ideas appreciated. Thanks in advance.
Here’s what it does in the Popeye machine:

Switch connections go to the CPU board, not the Power Driver Board. Rows 1 & 2 and Column 1 do link to opto isolators U7 & U8 on the PD Board but you are seeing different switches being closed - removing the ribbon cable between the CPU and PD Board and go into switch test mode would confirm this. So I'm confused why the issue moves with the PD board. Also looking at Popeye's switch matrix, 81, 82 & 83 are optos and will be normally closed. If you go into switch test mode, test all you switches to verify what is working and also see if any switch is showing multiple activations in the matrix.

Popeye switch matrix (resized).JPGPopeye switch matrix (resized).JPG

Pinwiki is a good reference for troubleshooting WPC issues https://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Switch_Matrix_Problems

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#3 3 years ago
 
TK

Tuukka

Pinside member

FI Lempäälä

5y 78,350 1,762 16 18

The optos get their 12V voltage from driver board. So check regulator Q2 (LM7812) and fuse 115.

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#4 3 years ago
OP
 
JJN

PinballGurus

Pinball Gurus

US Salem, OR

5y 47,550 732 34

Good to know. I actually tested the switch matrix on the CPU board going thru each switch and everything tested good, so I was super confused how I could have switch issues still... so knowing the driver board send the 12v makes sense. I know the fuse is good so it must be the Q2 - LM7812.

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#5 3 years ago
OP
 
JJN

PinballGurus

Pinball Gurus

US Salem, OR

5y 47,550 732 34

I tested the Q2 and it seems to test fine; F115 is good as well. Should I switch out the Q2 regardless?

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#6 3 years ago
 
TK

Tuukka

Pinside member

FI Lempäälä

5y 78,350 1,762 16 18

Q2 is not a transistor, but a voltage regulator IC. So you can't test it with a simple multimeter test. But you should see 12V against ground at both sides of F115 if Q2 is good.

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#7 3 years ago
 
FNG

DumbAss

Pinside+ Frequent

9y 109K 2,984

Quoted from Tuukka:

The optos get their 12V voltage from driver board. So check regulator Q2 (LM7812) and fuse 115.

All playfield voltage (except flipper voltage if the machine is WPC-89 and uses a fliptronic board or the extra flipper power supply board) does derive from the power board.

However ... optos are powered by the UNREGULATED 12V (+12VU) not the regulated 12V (+12VR).

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