All,
I performed the voltage checks at the KPA100 Test Points as stated on page
43 of the KPA100 manual (rev. C, Feb. 11, 2004). The D13 cathode should
have a voltage between 90 and 150 volts; the measured voltage is 175 volts,
which seems a little high. Also, the voltage measured at U4 pin is -30
volts, but the manual indicates the voltage range should be between -5 and
-25 volts.
Consulted the schematic and it appears as if the voltage from pin 8 of U4
supplies the High Voltage Bias Supply circuit. Mesaured the voltage at C44
as 45 volts, but schematic indicates it should be 30 volts.
Is 175 volts too high a voltage at the D13 cathode? R4 is 39K.
Any suggestions or help would be greatly appreciated!
Michael
KI5E
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