Lost rx green led

[Low_Boy]

We should start over. Tell us exactly.
1. Does the radio receive and transmit correctly.
2. Is no green RX light the only problem with the radio.

With this we can go further. If all the above works trace the wire that feeds the RX light back and see if you get power back further in the line. 064.9 mV will not power the light.

 

[kaos513]

We should start over. Tell us exactly.
1. Does the radio receive and transmit correctly.
2. Is no green RX light the only problem with the radio.

With this we can go further. If all the above works trace the wire that feeds the RX light back and see if you get power back further in the line. 064.9 mV will not power the light.

no recieve or transmit power but tx light comes on when key up also led channel display works

 

[LeapFrog]

no recieve or transmit power but tx light comes on when key up also led channel display works

Ok, I will leave a link here I found from a google search, I think this will help you a little.
http://www.worldwidedx.com/threads/need-help-with-cobra-148.196222/

 

[LeapFrog]

no recieve or transmit power but tx light comes on when key up also led channel display works

I've got to ask, have you made an attempt at removing the "sony bond" type glue, if you have.. and the radio is now giving you issues, go over those areas where you removed the glue, maybe you broke a lead somewhere.

I'm speaking from experience, I broke my Grant XL (lost TX) after being too aggressive with the glue removal (at the toroidal transformer in the left/rear near the driver stage).
That was a fun repair, I had to use hands like a "watchmaker" to get it done.

I also had issues at the resistor bank near the pll.

 

[Low_Boy]

This also sounds real silly but did you try this with another microphone?

 

[kaos513]

I've got to ask, have you made an attempt at removing the "sony bond" type glue, if you have.. and the radio is now giving you issues, go over those areas where you removed the glue, maybe you broke a lead somewhere.

I'm speaking from experience, I broke my Grant XL (lost TX) after being too aggressive with the glue removal (at the toroidal transformer in the left/rear near the driver stage).
That was a fun repair, I had to use hands like a "watchmaker" to get it done.

I also had issues at the resistor bank near the pll.

this radio doesnt have any of type of glue, i only see hot clear glue on some major transistors.

 

[LeapFrog]

this radio doesnt have any of type of glue, i only see hot clear glue on some major transistors.

Very good then.. Have you verified pll and vco are workinig correctly?

 

[kaos513]

i think this radio is a goner as i tryed to adjust the power and stays @ 4.3vdc

 

[LeapFrog]

i think this radio is a goner as i tryed to adjust the power and stays @ 4.3vdc

Where? What part of the alignment procedure are you on?

 

[kaos513]

Where? What part of the alignment procedure are you on?

i dont even hear a tone or see the meter movement

 

[loosecannon]

anyone have a schematic for these new 148's? (4 pin)
LC

 

[sonoma]

here is some info for the late model 148. not sure if it as new as you are looking for. it has the 4 pin mic on it.

http://downloads.cobra.com/CB/Models/148-SERIES/148_GTL_Late_Model/

 

[loosecannon]

check TR33 for 8 volts on the collector in receive.

sounds like you've lost RX VCC.
LC

 

[kaos513]

check TR33 for 8 volts on the collector in receive.

sounds like you've lost RX VCC.
LC

tr 33 is good

 

[kaos513]

check TR33 for 8 volts on the collector in receive.

sounds like you've lost RX VCC.
LC

tr 33 is getting 8 volts