Cobra 148 gtl 1992

[kaos513]

That is not a transformer, it is a choke. And no flow thru it means it shouldn't make any sound whatsoever without a load. Did you look at the schematic yet?

Did you check the on/off switch for 13v yet?

Yes on/off switch has 13v when switch is off

 

[kaos513]

That is not a transformer, it is a choke. And no flow thru it means it shouldn't make any sound whatsoever without a load. Did you look at the schematic yet?

Did you check the on/off switch for 13v yet?

I tested the tranfomer on dc has zero readings on ac i get 0.167 volts

 

[kaos513]

That is not a transformer, it is a choke. And no flow thru it means it shouldn't make any sound whatsoever without a load. Did you look at the schematic yet?

Did you check the on/off switch for 13v yet?

So your saying i have a bad choke on the board?

 

[Robb]

Yes on/off switch has 13v when switch is off

What about when the switch is on? Did you trace it with a DVM back to the voltage regulator? Why did you take the voltage regulator out?

 

[Robb]

So your saying i have a bad choke on the board?

Doubtful. Did you check for DC voltage before the choke?

 

[kaos513]

Doubtful. Did you check for DC voltage before the choke?

when i test the choke gives me sperattic readings

 

[kaos513]

Will not give me a steady reading.

 

[Robb]

Does your power supply give you a sporadic reading? After all; that is what the choke is seeing - the same thing.

Do you know how to trace voltage from the power supply to the switch and to pin 2 on the voltage reg with a DVM? Point to point to point. Whatever is coming from the power supply, it should be consistent throughout those points.

 

[sonoma]

he said the radio has been setting for a while now. did it work before it was left setting. if so I would be leaning more to bad solder joints or bad capacitors since the radio is as old as it is. yesterday I pulled a super star 121 off the shelf that was working before I put it up there and it was not working when I pulled it off the shelf. found some bad solder joints around the audio IC that had gone cold.after a few minutes of reheating them the radio is back to working now.

 

[kaos513]

he said the radio has been setting for a while now. did it work before it was left setting. if so I would be leaning more to bad solder joints or bad capacitors since the radio is as old as it is. yesterday I pulled a super star 121 off the shelf that was working before I put it up there and it was not working when I pulled it off the shelf. found some bad solder joints around the audio IC that had gone cold.after a few minutes of reheating them the radio is back to working now.

he said the radio has been setting for a while now. did it work before it was left setting. if so I would be leaning more to bad solder joints or bad capacitors since the radio is as old as it is. yesterday I pulled a super star 121 off the shelf that was working before I put it up there and it was not working when I pulled it off the shelf. found some bad solder joints around the audio IC that had gone cold.after a few minutes of reheating them the radio is back to working now.

I did recap the radio with the correct replacements I used Panasonic high grade caps, still get the same results.

 

[kaos513]

When the radio is turned on does the tranformer put out power and if so does anybody know what the voltage is soppose to be? thanks.

 

[Robb]

Again, what looks like a 'transformer' is actually a choke.
The voltage shouild be the same as the supply voltage coming in - which is 13v.

 

[kaos513]

he said the radio has been setting for a while now. did it work before it was left setting. if so I would be leaning more to bad solder joints or bad capacitors since the radio is as old as it is. yesterday I pulled a super star 121 off the shelf that was working before I put it up there and it was not working when I pulled it off the shelf. found some bad solder joints around the audio IC that had gone cold.after a few minutes of reheating them the radio is back to working now.

d44 was my issue, working on getting the am,ssb power back and audio back.

 

[kaos513]

d44 was my issue, working on getting the am,ssb power back and audio back.

Again, what looks like a 'transformer' is actually a choke.
The voltage shouild be the same as the supply voltage coming in - which is 13v.

Its alive! Tr-34 went bad.

 

[Robb]

Its alive! Tr-34 went bad.

Tell me; just how does a transistor responsible for SSB ALC control have ANYTHING to do with repairing/checking the power input and your 'transformer?'!?
Absurd.