Time to add some extra kick to my K2-10; but, of course, problems arise along
the way:
I find that U1 pin 2 to ground is only 5 kohms rather than > 10K. I can find
no solder bridges or misplaced components.
Resistors R24 and RP1 show the correct values. Should I suspect that Q10 is
shorted? Other pins on U1 give correct resistances.
U4, pin 8 shows a resistance of only about 2.8K rather than the expected >10K.
(As directed, the +ve lead of the meter is on pin 8, -ve lead to ground.) The
circuit diagram suggests that this is to be expected since the measurement is
made through two forward-biased diodes (D7 and D8) to ground. Reversing the
meter leads gives the expected high value of resistance.
Voltage tests as indicated on p 26 of the manual give expected voltages with
only 300 ma total current (20 ma increase over the K2 alone).
Joe Carney, KB3FBR
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