(Topic ID: 152939)

WPC reset and new WPC Power Fix does not solve

By swinks

8 years ago


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#5 8 years ago

The kahr board is more or less a band aid which doesn't actually fix the underlying problem.

Here is a troubleshooting guide to get you started:

http://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Game_resets

#9 8 years ago
Quoted from swinks:

are the tanalum caps the long white blockie components - sorry, should read the guide.

tantalium caps usually look somewhat like raindrops.

The long rectangles are resistors with a wattage rating of 5W or more. The reason they are so much bigger than the standard 1/4w resistors you're accustomed to seeing is that they can handle more current and dissipate the heat better.

On the PCB, there are various letters and numbers printed, such as R22, Q5, C23, etc. The letters give you an idea of what the component is--
R = resistor
D = diode
C = capacitor
F = fuse
Q = transistor
TP = test point (for checking voltage)
J = Connector Jack
P = Connector Plug
L or LED = LED
W (or sometimes J) = jumper
BR = Bridge Rectifier
SR = Serial Resistor network

The number that follows the letter is a reference to where you can find the labeled component on the parts list or schematics so you can find the part number or attributes of that component.

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