Cobra GTL 2000 Power up Issue

[AJAY0618]

Hello All,

Recently I pulled and old Cobra 2000 GTL from storage and attempted to turn it on. Only the clock displays and after testing the transformer voltage, I read 15.7v which seemed goo. Then I read teh voltage across the 4700uf Cap at just over 19v. I am considering replacing all caps but want to know if there may be another reason I am not able to power up this unit.

Thanks,

Arthur

 

[sp5it]

Isn't it better to diagnose first, before ripping radio apart?

 

[AJAY0618]

I didn't rip the radio apart

 

[sp5it]

Good.
Is there any schematic available? I could try to help diagnose your radio.

 

[AJAY0618]

Not that I know of.

 

[AJAY0618]

Found these though one is in spanish

 

[Shadetree Mechanic]

Welcome! I wonder if the clock can turn the radio on and off? Maybe it's in the wrong mode?

 

[AJAY0618]

Welcome! I wonder if the clock can turn the radio on and off? Maybe it's in the wrong mode?

What do you mean exactly?

 

[sp5it]

What's a voltage on F402?

 

[AJAY0618]

What's a voltage on F402?

13.35v

 

[AJAY0618]

The fuse was tested for continuity but that should be self explanatory at this point

 

[sp5it]

So, nothing wrong with power supply.
Put radio in AM and what's a voltage on TP8 or TP7? Driver/final PS.
Also check if power switch is working. It switches ON the rest of the radio by connecting "ground" For a test you can bridge points marked red with a piece of wire.

 

[AJAY0618]

Will do and good question on the power switch. Hey I located this if anyone else requires it and in english. Also main schematic.

 

[AJAY0618]

So, nothing wrong with power supply.
Put radio in AM and what's a voltage on TP8 or TP7? Driver/final PS.
Also check if power switch is working. It switches ON the rest of the radio by connecting "ground" For a test you can bridge points marked red with a piece of wire.

If I have read this correctly at the points specified it is 12.44v. This seems to indicate that the switch is working. This is in AM mode.

 

[sp5it]

It depends from where you took "-" for that measurement.