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Topics - Robb

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Ham Radio Circuits and Repair / President HR 2510 CPU/PLL issues
« on: February 14, 2018, 08:46:42 PM »
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

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