Williams Power supply

NOTE: This 12V power Supply is for the Top Display

Do not use in Games Main Power Supply

Problems that I have found:

Had 3 Power supplies that C20 was bad

Had 2 Power Supplies that 2SK1940 was shorted

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This is the Power Supply for the Games Main Power Supply

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The Lamps on the door was fickering

Changed C5  47uF 25v

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Problems that I have Found:

First seen a blown Fuse, and the SCK104

NTC THERMISTOR-INRUSH CURRENT LIMITING

DEVICES

Meritek NTC Power Thermistor (SCK) devices are made of a

specially formulated metal oxide ceramic material which is capable

of suppressing high inrush current surges.

SCK devices, being of relatively high resistance, shall limit the

inrush current for I - 2 seconds during which time the device

decreases in resistance substantially to a point where its voltage

drop is negligible. The devices are especially useful in power

supplies (see Fig A) because of the extremely low impedance of

the capacitor being charged, of which the bridge is usually

subjected to an exceedingly high current surge at turn on point.

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Also Found that the BT151 was shorted

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