Siltronics LA-550 " keying relay issues"

[SuperLid]

Ok, yeah I am not very good at identifying them it just looked like one that I saw online or this one I have here, i thought it looked like it View attachment 61078

It is a general purpose switching diode. Use 1N914, 1N4148 or equivalent. If you don't have those, use a 1N4000 series it will work. But, check it first...

 

[Danzik]

Why do you call it a Zener? I believe that is D7. 1N914 NOT ZENER!

Maybe I ought to stick to looking at the actual schematic and not assuming, sorry

 

[Danzik]

It is a general purpose switching diode. Use 1N914, 1N4148 or equivalent. If you don't have those, use a 1N4000 series it will work. But, check it first...

Can I check it in the circuit or remove it then check it ?

 

[Danzik]

Maybe I ought to stick to looking at the actual schematic and not assuming, sorry

They usually need to be removed don't they ?

 

[SuperLid]

They usually need to be removed do

You can remove it if it shows a short. If not, then don't bother.

 

[Danzik]

It tested like this one direction only and still installed in the board

 

[SuperLid]

It tested like this one direction only and still installed in the board

It is probably good. I would look more closely at the two transistors. I am guessing they ain't right.

 

[Danzik]

Or 1.275 k ohms one direction no continuity either, the bad one I replaced in this board does have continuity

 

[Danzik]

It is probably good. I would look more closely at the two transistors. I am guessing they ain't right.

Ok, I sure will ! I have to eat and get ready for bed but i will check the orientation of them tomorrow after work from the schematic, I sure appreciate you helping me with this mess

 

[nomadradio]

My idiot light just came on. You don't have a diagram for it do you?

Now ya do.

I was never fond of this keying circuit. You may want to dribble some contact cleaner onto the trimmer pot on the keying circuit pc board. Work it back and forth so the solvent can do its thing. Might make all the difference right there.

 

[Danzik]

My idiot light just came on. You don't have a diagram for it do you?

Now ya do.

I was never fond of this keying circuit. You may want to dribble some contact cleaner onto the trimmer pot on the keying circuit pc board. Work it back and forth so the solvent can do its thing. Might make all the difference right there.

We'll do Nomadradio !

 

[Danzik]

My idiot light just came on. You don't have a diagram for it do you?

Now ya do.

I was never fond of this keying circuit. You may want to dribble some contact cleaner onto the trimmer pot on the keying circuit pc board. Work it back and forth so the solvent can do its thing. Might make all the difference right there.

And thanks for the advice

It is probably good. I would look more closely at the two transistors. I am guessing they ain't right.

I ended up staying up last night until blurry eyed with this thing past 1 am back to work at 5 , well, you were correct again I had Q1 transistor incorrect! After I put them the way they are supposed to be I bet I checked the schematic 20 times, unfortunately the relay is still engaging when turning the bypass switch to low or high, when I get home today I am going to deoxit the pot Nomadradio was referring too ‍ glad I put those connectors on those wires for the relay, I had a feeling I would be removing it several times, makes the job quicker !

 

[Danzik]

My idiot light just came on. You don't have a diagram for it do you?

Now ya do.

I was never fond of this keying circuit. You may want to dribble some contact cleaner onto the trimmer pot on the keying circuit pc board. Work it back and forth so the solvent can do its thing. Might make all the difference right there.

What does that pot really do anyways? Is it possible that is the issue with the relay staying engaged when switched to low or high power without keying the mic ? Thanks

 

[SuperLid]

And thanks for the advice

I ended up staying up last night until blurry eyed with this thing past 1 am back to work at 5 , well, you were correct again I had Q1 transistor incorrect! After I put them the way they are supposed to be I bet I checked the schematic 20 times, unfortunately the relay is still engaging when turning the bypass switch to low or high, when I get home today I am going to deoxit the pot Nomadradio was referring too ‍ glad I put those connectors on those wires for the relay, I had a feeling I would be removing it several times, makes the job quicker !

What transistors did you use? Have you checked them now?

 

[Danzik]

What transistors did you use? Have you checked them now?

I used the 2NC945 I had to twist one around pretty good but it worked out ok but no I have not checked them since the install, but sitting here on break I am thinking about something that I may have done incorrectly, there is a large resistor on that relay board on the bottom and it goes down to antenna in jack, I am wondering if that was supposed to go to ground instead of the center post ????