Over The Air > Ham Radio Circuits and Repair

President HR 2510 CPU/PLL issues

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Robb:
Howdy, Radio tech and friends!
My first post here:

Have a 2510 that won't play nice.  Radio is TXing on 26.965mhz only - regardless of the display setting.  Using the Service Manual from CB Tricks BTW.  The VCO voltage setting won't change/adjust and is stuck on 7.15v @ TP 303 regardless of the freq setting; supposed to be 6.5v @ 29.699mhz/AM.  TP 306 is supposed to read 6.200mhz @ 28mhz,l but reads ~4.9mhz and won't adjust either.  Seems that none of the adjustments are working. 

Also, where is the ground point for testing on the CPU board? Think this may be my issue testing it and the settings issues.

I've worked on a lot of Galaxy, Cobra, and other CB radios; but never on a Ham 2510.  So I am a newbee to working on this radio.  Gonna test the voltage regs next.  Replaced all of the caps already.

Anything you can toss my way to help get this one in A1 working condition is appreciated.
Thanks!

BTW - the Service Manual does NOT cover all of the adjustment points; it really is lacking in that regard.  But that is the best I can find it seems.  SAMS Photofacts doesn't have a manual for it either? <shrugs>

http://www.cbtricks.com/radios/uniden/hr_2510/graphics/uniden_hr2510_sm_pg01_pg28.pdf

Robb:
Addendum:  Both voltage regs on the CPU/PLL board tested OK.  Voltage reg for the main board also checked OK.

The Radio Shop:
The main thing with these radios are capacitors in the CPU board. They are terrible for going leaky. Also any of that old yellow glue needs to be removed.

The Radio Shop:
BTW,
Welcome to the forum.

Robb:
Thank you Radio Tech for your reply.  Thing is, I replaced all of the caps in the radio including the CPU board.  Even tested all of those caps and only a few were marginal and a few shorted outright on the main board (one in the final bias circuit & two audio caps). Removed the glue too.

Just cannot understand why the voltage and freq adjustments on the CPU board are non-responsive?   The volt regs all tested OK as well.  Kinda stuck w/o a clue.  Have any insights where to look next?

Thanks!

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