VR117 in HR2510

[mechanic]

Just a question about the variable pots in a HR2510, One of my units has a poor meter response with showing RF out. Adjusting VR117 works but the adjustment is "jumpy" and does not hold. :blink: Is this adjustment pot sampling the RF or is it part of the circuit and being flakey, alters my RF out?
Hoping Rogerbird checks in!

73 mechanic

 

[Pioneer621]

Hello mechanic,

If its “jumpy” when adjusting VR117 it sounds like it is dirty & needs cleaned or replaced. I’d start with that especially if the S-meter readings seem normal & steady.

The 2510 variable pots may be hard to clean though the way there made, I have never cleaned them before so I am not sure.

VR117 looks like it adjusts the DC output voltage of the TX meter circuit after all the RF sampling & rectification has been done. Again, if it’s touchy when adjusting, it sounds like it’s dirty or oxidized.

Pioneer621

 

[Rogerbird1]

NOte

Also make sure the PC board screws are tight.. generally if you are having Metering issues, it can be related to the board screws.

Roger

 

[mechanic]

All is well now and I found an intermittent with the 8 volt regulator mounted on the side frame! Simple resolder did the trick! :laugh:

Thanks for the pointers!

PIC shows the bad joint, it is the output leg....

73 mechanic