#174

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Shows my repairs of a President HR2510 radio, which had no TX, no RX audio, a short with Beep turned on, (which killed TX as well), unable to be tuned to frequency, blown meter bulb, distorted TX and RX audio, and probably other stuff I forget to mention.
This is part 1.
See part 2 here: • #176 HR2510 Repairs 23...
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Some Of My Electronics Tools (video and purchase links)
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Boonton
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4220.
8210: defs.link/?u=e...
Fluke
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8842A:
45: defs.link/?u=e...
343A: defs.link/?u=1...
5200A: defs.link/?u=a...
540B: defs.link/?u=0...
893A.
A90.
HP/Agilent/Keysight
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4261A: defs.link/?u=0...
5005A.
5342A 18GHz: defs.link/?u=5...
6181B: defs.link/?u=b...
8012B: defs.link/?u=c...
8648B: defs.link/?u=d...
8901B: defs.link/?u=5...
DSOX1102G: defs.link/?u=a... defs.link/?u=1...
E3646A: defs.link/?u=1...
Marconi
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2022D.
2955.
TF2103: defs.link/?u=6...
Rohde & Schwarz
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SMY: defs.link/?u=9...
CMU200: defs.link/?u=8...
Polarad SPN: defs.link/?u=2...
Siglent
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SDM3065X: defs.link/?u=1... defs.link/?u=1...
SDS2102 (hacked to 340MHz): defs.link/?u=1... defs.link/?u=1...
SPL-1008.
SDP1168X: defs.link/?u=1... defs.link/?u=1...
SDL1020X-E: defs.link/?u=a...
Other Equipment
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KSGER T12 Soldering Iron: defs.link/?u=6... defs.link/?u=5c...
Quick 861DW: defs.link/?u=1... defs.link/?u=a...
S-993A: defs.link/?u=0... defs.link/?u=e...
EEVBlog BM235: defs.link/?u=1...
YR1030 Battery ESR: defs.link/?u=c...
Heathkit IT-12 Signal Tracer.
Racal Dana 1992: defs.link/?u=8...
Bird 43: defs.link/?u=4...
Sinadder 3: defs.link/?u=2...
Audio Control SA-3050A RTA: defs.link/?u=a...
Korad KA3305D: defs.link/?u=6...
PDVS2mini: defs.link/?u=8...
Valhalla 2703: defs.link/?u=0...
Feeltech FY6800: defs.link/?u=8... defs.link/?u=34...
Eakins Microscope: defs.link/?u=b... defs.link/?u=2...
Mustool G600: defs.link/?u=b... defs.link/?u=3...
Handheld Equipment
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Uni-T UT210E: defs.link/?u=3... defs.link/?u=e...
DER DE-5000: defs.link/?u=0... defs.link/?u=1...
MK-328: defs.link/?u=0... defs.link/?u=7...
MESR-100: defs.link/?u=0... defs.link/?u=0...
ESR Meter: defs.link/?u=0...
HOPI: defs.link/?u=7...
PeakMeter PM6252: defs.link/?u=5...
HS1010: defs.link/?u=1...
Thermal Camera: defs.link/?u=2... defs.link/?u=4...

[@grantfullen9559]

GREAT Job. Love the troubleshooting process :)

[@vimmeh]

nice job on the fix, that was a good bit of detective work :)

[@PaulMoorhousehankooks]

Great stuff

[@janemorong4970]

Great video Defpom. I have a question though. Not sure if you still work on these, but I recently inherited one of these old rigs when my father, N1CSS passed away and I'm trying to fix it up. It hasn't been used in a very long time, and I'm not sure what was wrong with it when he put it away. But anyway, I can't get very far with testing, because the power is a dead short! I removed the glue and even REPLACED both regulators, and no love - still shorts out. Any suggestions?

[@mikesradiorepair]

Worst problem I find with these is all the corrosive glue in the final section. Last two I did had dead shorts the glue was so conductive.

[@TheDefpom]

Yeah, I have been picking it off carefully, I found heating it up with my hot air station softens it easily making it much easier to get off, someone had already removed the glue from the voltage regulators on the MPU board.

[@mikesradiorepair]

TheDefpom Unfortunately what I have been seeing lately in these has turned dark brown and is hard as a rock. One of the last ones I did had corroded the wires off 3 of the coils. Hate having to rewind those.

[@mikesradiorepair]

TheDefpom I have several original service manuals. If you want better scans of the board layout let me know.

[@TheDefpom]

Yes, high quality scans of the diagrams would be nice, especially of the board layouts.

[@malcolmrock8338]

HI my name is mark i have a hr 2510 tx is ok but no receive in all modes.I can trace my signal am to d111 and 112 but not at q109 i change ic 101 but still no signal at 109 there is one thing at ic 101 agc pin 8 and 10 have 6.8 voltes at all times squelch on or off no change.the signal meter indicate a signal. problems found q103 d117 d111 was open i replace them all voltages in the transistors in the receive chain read ok change the two 47uf capacitors any suggestions would be greatly appreciated thank you very much Mark

[@d1sc0verer]

Hi, my HR2510 doesn't retain the last frequency after switch off, no battery present, how can I fix it? THANKS

[@jcee4239]

I've got an issue with my Lincoln. Today the AM and FM TX has died, but SSB is ok. The radio receives on all modes. Are you able to advise which areas on the PCB I should be checking out? I suspect a component has failed. I;ve had the radio for years and this is the first time it's had a fault. Many thanks! JC

[@n8tuwstevenewland933]

can you do a video on aligning the freq, I have a hr . love the old radio . had it for years. and the shown display is off from the freq. is there a simple fix with just a pod ?

[@kdx-pn7up]

Hi there, don`t know if you can help me but i have a Mk.1 President Lincoln that i bought cheap off Ebay. It was stored for many years not being used so when i got to fire it up all seemed OK, its got RF power "about 17w" am-fm. BUT NO modulation !!!! Done the DE-glue and now have about 21w but still no modulation...checked the standard mike and that seems fine, any ideas ??? Thanks Chris

[@TheDefpom]

30ok777- it is probably a bad electrolytic cap in the audio circuit, lower your rf power down to 10w am, you really don’t want to blow the final as they are not made anymore.

[@tonystrickland265]

Ware did you get the desolder gun, please let me know.

[@TheDefpom]

I have done reviews on a few different ones, the best by far was the Pros Kit which is now my main unit.

[@tonystrickland265]

@@TheDefpom THANK YOU AN MERRY LITTLE TO YOU AN YOUR FAMILY.

[@Scott-K7sce]

sometimes a recap fixes everything :-) that output power you showed. thats suspect, someone has been in that radio turning things that shouldn't

[@TheDefpom]

Yep, otherwise it seems OK really, I dropped the power to 7W AM/FM to reduce the chance of blowing the hard to find final transistor !

[@randybehrmann5454]

I'm in the states. I need to replace the memory super capacitor on an HR2600 and I have had no luck finding which one it is. Would you be willing to let that information out into the wild?

[@TheDefpom]

Randy Behrmann - I don’t remember exactly where it is in the 2600, but look for a very low voltage (I think it was about 2.7v, but will certainly be less than 6v) and very high value cap, on the MPU board close to the big MPU ic. I’m not near a diagram at the moment so cannot tell you the exact values.

[@ddjj868]

Little blue ceramic cap right next to the cpu

[@joereeser3810]

Hi would it be possible to email me the trace side parts layout diagram? Thank You

[@transcanada9028]

Could you show the other half of the board layout

[@tallbiker6758]

Can anyone show me the schematic for installing the priority board?

[@TheDefpom]

Sorry I don’t have it

[@tallbiker6758]

Ok. Can anyone else link me to anyone who deals with the chipswitch and or priority board? I have the opto couplers, Just need to know where to connect it.

[@jameslane2667]

Look mate 43 division and I'm back out