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?