Hi all, I'm hoping someone can point me in the right direction here. I'm helping a friend fix his WCS94 and I haven't been able to get to the bottom of *all* the issues yet.

It all stared with the "check F114 F115" message. After checking all fuses (all were good) I removed the driver board and noticed that the cap right next to the 12V regulator had exploded and leaked on the board. I removed that cap (and cleaned up the board) and noted that the trace was had been corroded and was no longer connected to the via. I replaced both the cap (fixed the trace and ensured that I had good connectivity) and the 12VDC regulator (just in case).

After turning the game on again (attract mode seemed fine) I started a game... but I immediately noticed that a lot of the inserts were lit when they shouldn't be. After playing for a short time the game reset. I booted back up and went to test mode ALL switched tested fine. I then noticed that the slingshots weren't working as well as the pop bumpers and eject holes. The coils weren't working because F105 kept blowing on power-up and I determined that it was a shorted coil. I removed the coil from the circuit (cut the leads) and now F105 doesn't blow and the slings, pops and ejects work fine. I believe I'll be able to resolve the coil issue by replacing the coil, the associated transistor (if the coil locks on when I boot it up).

The odd thing is that the +12V regulated test point reads 10.5V-11V and it fluctuates. Any ideas what might be causing this?

Here are all my measurements:
tp1 - 13.9V
tp2 - 5V
tp3 - 10.5-11V
tp4 - 0.4V
tp6 - 75V (this one starts at 100V and levels out at 75V.. not sure if that is normal)
tp7 - 22V
tp8 - 14V (seems a bit low.. should be ~18V??)

And the LEDs are lit as follows:
1 - lit
2 - lit
3 - pulses
4 - lit
5 - lit
6 - lit
7 - lit

The next issue I need to investigate is the lamp matrix. As I stated before there are multiple inserts lighting up when only 1 should be. I went to the lamp matrix and tested the first 2 columns and got these results (I haven't verified these.. need to double check to be sure I recorded properly):

11 - lights 11,44
12 - lights 12,16,61,76
13 - lights 13,61
14 - lights 14,16,64,76
15 - lights 15,65
16 - lights 18,68,76
17 - lights 17,77
18 - lights 18,16,68,76
21 - lights 21,65,81
22 - lights 22,86,62,82,76
23 - lights 23,83
24 - lights 86,76,64,84
25 - lights 65,85
26 - lights 88,68,86,76
27 - lights 77,78
28 - lights 76,68,86

Those are all I had time to record. I wanted to check them all. The next step of course is to unplug the lamp matrix from the driver board and test each row and column manually. I suspect this is not a wiring issue on the playfield as this was not an issue before the F114,F115 messages started.

So I guess my question here is where to go next? Assuming of course that it's not a playfield wiring issue, what should I check next?

How do I go about determining what is dragging it down? I'll try to disconnect the lamps and test voltages again... perhaps there is a wiring problem causing this funkyness because TP8 is also low. According to the schematic TP8 represents the voltage going to the lamp columns... am I reading that correct?

I'll check this again.. I took some pictures and double/triple checked. But wont hurt to do this again. I'm pretty positive everything is correct though.

This seems logical however doesn't the 12V voltage regulator allow for higher input voltages and regulate them to 12V? If TP8 is 14V shouldn't the regulator have no issues producing the 12V? Unfortunately I haven't had a chance to get over to my friends place to do some more debugging so I don't have much to report.

All voltages I have measured after I replaced the voltage regulator with a new one. I replaced it at the same time as the cap.

Performed this test (thanks for the tip on testing while the board was in)... BR1 is bad. Ordering a replacement as well as replacements for C6 and C7 just to be sure.. I'm sure they are due to be replaced.

Test results:

1) 526
2) 526
3) 190
4) 190