[Elecraft] Help: K2/100 # 2469

[Dan Holloway]

Hello all,

While checking my K2/100 before heading off on an IOTA trip (to OC-206 
in August), to my amazement, I discovered that the receiver was dead.  I 
have tried to resolve the problem but so far have failed to fix it.

I appeal to the very knowledgeable folks here for assistance.

Symptoms:  Transmit is normal, with the KPA100 and without (QRP); 
sidetone, spot and keying are normal.
Receive: Only a hiss is audible.  I can very faintly hear the XG1 on 
7040 kHz (RF and AF gain full).  With an antenna connected, I can very 
faintly hear WWVH's tones on 10 MHz.  I first suspected the switching 
diodes D2, D3 and D4 on the RF board but their voltages are normal as is 
the 8V output of U4 on the RF board.  I recently built and installed the 
KNB2.  I have only removed and reinstalled it.  I have not removed it 
and reinstalled W5.  The NB display is as expected.  Turning it on/off 
has no noticeable effect on the receiver.  This rig also has the K160RX 
installed and I have removed and reinstalled it.  I have gone through 
the Primary and Secondary menu options and have discovered nothing that 
affects the receiver.

Prior to installing the KNB2, all was well; in fact, the rig managed to 
work QRPDXCC so the rx was good then.

I suspect that this is a very simple fix.  Can someone help me?  I won't 
be surprised if I am the problem and just can't see the forest for the 
trees!

Thanks in advance and 72/73,

Dan
VK8AN
K2/100 # 2469