[R-390] K601

[Rick Brashear]

Before I delve too deeply into the audio module of my R-390 I want to 
ask if anyone has had similar problems or if the symptoms I am 
experiencing are common. 

First, I have a wire (black and white) that has been disconnected in the 
back of the upper deck next to the break-in relay, K602.  I am assuming 
it connected to the coil terminal of K602 with the other black and white 
wire.  The symptoms are:

When I use the break in function to quiet the receiver during transmit 
the audio does not quiet, only the antenna is grounded.

When I connect the loose black and white wire to the terminal on K602 
with the other black and white wire and press PTT I get a buzzing sound 
similar to a DC relay on AC current.  It appears to be coming from 
K601.  This does quiet the audio as it is supposed to, but there is 
obviously a problem with the relay (K601) or the associated circuitry.

Has anyone experienced this problem?  Are those relays anywhere to be 
found if need be?

I'm sure the defective relay or circuitry is the reason someone 
disconnected the loose wire.  Any suggestions?

Thanks,
Rick/K5IZ