Wells Gardner K4900/K5515 Auto Protect Board

SuperSprint

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The subject of the little daughterboard on the LH frame of a K4900/K5515 chassis comes up a lot, so I thought I would take a look at mine and provide whatever information I can for those that may be looking for one, or considering building their own.

Part #: P390
Descrip: Auto protect board
Location: Sync section.
Settings: Pot measures 5kΩ full spread. As installed (and glued), mine measures 3.5K/1.5K leg to wiper (in circuit). 1.5K was measured from wiper to the leg closest to the board edge.
 
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