Re: Ft-301ad blinking s-meter no transmit
开云体育I think you should be seeing full coil voltage there if the Protection circuit is in proper shape (hasn't triggered). The 1k ohm to ground reading with power off is a good sign - the relay coil has continuity.? Next, check Q1301 or D1301. I'm betting the trouble lies with one of those two components.? 73 - Fred, N8YX? -------- Original message -------- From: KI7WQH Steve <sdandrus@...> Date: 5/5/20 8:14 PM (GMT-05:00) To: KI7WQH Steve <sdandrus@...>, [email protected] Subject: Re: [yaesuft301d] Ft-301ad blinking s-meter no transmit "Look at the emitter of Q1301 - top of the relay coil. See any voltage there when the rig is powered up? ?
Also check continuity of the relay coil from that point to ground with the power off.
?
73 - Fred, N8YX "
So I put the positive probe on pin 1 (i'm pretty sure this is pin 1 based on diagrams on the internet) of Q1301 and the negative to the negative of the power supply and while it was powered on I had about .38 volts detected. When powered off, there was about 1k ohms going back to the negative. It was tricky to get the probe in there without shorting stuff out but I'm pretty sure I got it right. |