[Elecraft] KPA-100 Voltage Test Failure
[email protected]
[email protected]
Tue Jul 2 00:01:02 2002
I would appreciate any help in getting the 90 - 150 volt bias. I have looked
at the bifilar windings on T3 and the green and red windings are properly
wired in. Q8 is warm to the touch. Q8 collector voltage is +11.9 and the
base is +.67. U4 (MAX1406) pin 8 shows 0 volts and TP1 (near Q2 and T2)
shows 0 volts. Power is fed via the barrel connector and the K2 displays the
voltage of 13.2 and occasionally will flicker to 13.1. The current changes
constantly between .420 and .460. I am on the KPA100 assembly book page 43
and holding. I either have a PTTL problem or a bad 16.289Mhz (X1) crystal as
I see it. Any comments and suggestions would be appreciated. Thanks. Roy
Morris W4WFB K2 #2225