President Washington Clarifier?

[CB RADIO FREQ]

Hello. Does anyone know the right way to open and unlock the clarifier on a President Washington AM/SSB base radio. I've seen and read many different ways on how to do this but nothing seems to be working right. Also does anyone know the correct value of the clarifier control, mine has a 100k ohm in it now and I do not think it is right. Overall any help would be grately appreciated. Thanks!

 

[sonoma]

what PLL is in it.

 

[sonoma]

this is for the 858 PLL. let us know if you have the 8719 PLL.

Unlocking the clarifier:

(1) Remove R-117 and also remove D-30

(2) Unsolder brown and purple wire on the circuit board,belonging too
the Clarifier.

(3) solder the PURPLE wire to a constant 8vdc point on the circuit board.

(4) solder the BROWN wire to the circuit board ground.

 

[CB RADIO FREQ]

Sorry to say this but, I do have the MB-8719 PLL. Thanks.

 

[ExitThirteen]

No problem mate, I gotcha.

The correct value for the clarifier control is 20k ohms.


President/Uniden Washington clarifier mod (MB8719 PLL)

Clip or remove R187
Clip or remove D36

Unsolder the red wire going to the clarifier control off the main board, and resolder that wire to the main PCB ground.

Unsolder the orange wire going to the clarifier control off the main board, and solder it to the + side of C66. C66 is a 1000uf 10V electrolytic capacitor, and is located next to the PLL IC, and the + side has 8V present.

Good luck!


~Cheers~

 

[CB RADIO FREQ]

Thank you for the information. This will be a great help to me.

 

[sonoma]

good job exitthirteen, you beat me to it.

 

[ExitThirteen]

On the President/Uniden washington chassis, I mod them differently then everyone else. Mine's a bit more complicated, so I gave him the standard unlock instructions! LOL



~Cheers~

 

[CB RADIO FREQ]

Thanks again for these instructions. They were a big help to me.