[R-390] K601

[Tim Shoppa]

Rick writes:
> 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.

K601 is supposed to be an AC coil relay. I'm not sure what wire colors
are supposed to be where, but one side is 6.3VAC from the filament
winding, and the other can be grounded by the transmitter through pin 9
of
TB103 if and only if the break-in switch is on.

Often when AC coil relays "go bad" they exhibit the buzzing you
describe.

Tim.