From what I read, Q29 is the transistor that would most likely be shorted. Might want to check that out.Originally Posted by VE6IVN
From what I read, Q29 is the transistor that would most likely be shorted. Might want to check that out.
KKM ty Looked at q29 its ok so probably the relay next thing to look at also found another one on line bought it so at least I will be back on the air and I will be able to play with this one
When you turn on the radio, can you hear or see the T/R relay engage? If so, something is causing it to pull in. Another thing to try, since you say the relay driver (I assume Q29 is the relay driver as I still haven't looked at a schematic yet) is okay, is to see if it is turned on. Check between the base and emitter and see if there is around .6 volt between them. If so, and the relay is tripping when you apply power, you can assume it is a problem further back.
ETA. If you find the E-B voltage on the relay driver is not always present, and only goes to .6 volt when the radio is put into xmit mode, then perhaps the relay contacts are shorted or stuck. If you do pull the relay out to replace it, that would be a good time take some readings prior to putting the new one in, especially at the relay coil points.
Good luck.
Last edited by K7SGJ; 11-12-2013 at 09:36 AM.
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