Tempest +15 Issue

flynn54321

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I have a tempest board that is giving me problems

Voltage is good To the board
at vr3 there is +15 but when I go and check it at the check point on the board - its not even half that.... Does anyone know what is causing this drop in voltage between these two points?

All other voltages are fine.
 
Has to be either a cracked path or a poor solder joint, you can also run a strap from the +15V test point directly to the +15V from the regulator, it's only a couple of inches.
Dick
 
Well it could be a shorted, or shorting diode CR4, less likely would be a bad cap C62. It could also be that VR3 is failing under load.
 
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