[Elecraft] KSB2 Troubleshooting Questions

[Paul Clay]

I installed my KSB2 this evening into my K2 ser 
3640.  Everything seems ok except that  my 
receiver senstivity seems a bit degraded, and 
maybe the volume's a bit lower.  E,g,, local AM 
station I was listening to today after installing 
the K160RX now, after installing the KSB2 now 
seems much weaker, as do signals on 40 meters.

As directed by the manual, I took some voltage 
readings.  Most readings are just about right.  
However,  U2-5 and U4-3 are reading about 6v 
(5.94v to be precise) instead of the 0.6v shown 
in the KSB2 manual's voltage table.  Are the 0.6 
table entries in the manual typo's?  The pins in 
question are connected (if I read the schematic 
correctly in the circuit to U1-2,; at U1-2, I'm 
measuring, as the manual's voltage table says I 
should measure, about 6 volts (actually, 5.94v, 
which I think is close enough).

As I said, every other voltage seems about right; 
FWIW, a lot of locations that are supposed to 
read 0v are actually reading somewhere between 10 
and 20 mv; other than that one location that's 
supposed to read 400mv is reading about 260mv - 
but I attribute these differences to the vagaries 
of my DVM.

Thanks in advance for any helpful suggestions.  
Maybe it (the apparent lower senstivity and 
volume) is all in my head or just reflective of a 
change in band conditions between late this 
afternoon and late this evening (tho that local 
AM station shouldn't be so different in signal 
strength.

- Paul, N6LQ

PS -My KSB2 manual shows Revision C, May 2, 2000, 
with an errata sheet showing Rev C-4, March 18, 
2003.