Tram D62 unknown VR

[Lkaskel]

Hey Everyone,
I have finished a Tram D62 repair and alignment by using the Cobra 132XLR info as I cannot find anything specific to the Tram. I was able to find a few differences but there was one VR that I cannot seem to figure out what its for.

 

[nomadradio]

Now there's a mystery. The Sams shows a medium-fat electrolytic cap in that spot. A transistor next to it is TR24, but all it does is switch 8 Volts to transmit.

Must be a later revision of the circuit board than the Cobra.

73

 

[Dr. Frankenstein]

Why don't you tried to add this mystery trim pot to the Schematic?

Then let the rest of us know how it's connected in the circuit by posting a shot of the schematic with this mystery pot's location.

I'm sure someone from the forum will figure it out.

 

[nomadradio]

Sams CB179's grainy monochrome pics do not show a circuit board number where the above pic shows KNTB001 at the upper-right hand side. Sounds like two different revisions to me.

This radio uses a double-sided circuit board with foil traces running between the components' legs on the top side. This makes manual tracking of the foil traces a lot tougher. A single-sided pc board is a lot easier to trace out.

73