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🔴 President HR2510 Repairs Part 2 (SN3718) – No.873


This is part 2 of the repairs on a President HR2510, it had LOTS of issues, so it took 2 videos to cover the HR2510 repair.

This repair can also help with the President HR2600, President Lincoln, Uniden HR2510, Uniden HR2600 radios.

See Part 1 of the President HR2510 repair here: https://youtu.be/XR3N-933NTQ

0:00 – Intro.
1:06 – President HR2510 repair continuation.
1:45 – Testing TX control lines on HR2510.
5:40 – Testing the TX mixer output.
6:58 – Correcting the 22MHz crystal frequency.
10:17 – Finding an odd MPU control fault.
11:25 – Investigating HR2510 no TX fault.
19:00 – Fixing the HR2510 MPU control fault.
24:10 – 4 years later, fixing the HR2510 transmitter fault.
27:31 – Replacing the MRF477 final transistor with a substitute.
30:45 – AM transmit not working on HR2510.
32:22 – Installing a external speaker socket on the HR2510/HR2600/Lincoln.
33:31 – Tracking down the no AM transmit fault.
46:00 – HR2510 I.F. diagnostics.
50:10 – Fixing the problem with AM transmit not working.
53:24 – HR2510 balanced modulator IC105 AN612 example waveforms.
55:20 – HR2510 TX mixer IC106 TA7320P example waveforms.
56:41 – Why transistor bias needed on RF amplifier transistors, and why the MRF477 final transistor caused bias voltage problems.
59:08 – Patreon Supporters: https://defs.link/?u=fcb3a1


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My Electronics Tools (video and purchase links)
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Boonton
——
4220.
8210: https://defs.link/?u=e1eddc

Fluke
——
45: https://defs.link/?u=eac51d

HP/Agilent/Keysight
——
3457A.
4261A: https://defs.link/?u=07ed95
5342A 18GHz: https://defs.link/?u=5f7513
8012B: https://defs.link/?u=ca5764
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E3646A: https://defs.link/?u=128f4a

Marconi
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2022D.
2955: https://defs.link/?u=6f6e5e
TF2103: https://defs.link/?u=61baaa

Rohde & Schwarz
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SMY: https://defs.link/?u=93514b
CMU200: https://defs.link/?u=8ccd72

Siglent
——
SDM3065X: https://defs.link/?u=1ed0fe https://defs.link/?u=12d498
SDS1104X-E.
SDS2102 (hacked to 340MHz): https://defs.link/?u=1ed0fe https://defs.link/?u=12d498

Other Equipment
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UNI-T UTi260B Thermal Imager: https://defs.link/?u=f3283d7 (use discount code: BG45411)
KSGER T12 Soldering Iron: https://defs.link/?u=620ace http://defs.link/?u=5c112e
Quick 861DW: https://defs.link/?u=138c0f https://defs.link/?u=a3fc81
Pro’skit SS-331 Desoldering Station: https://youtu.be/o_OKRknuoCM
S-993A: https://defs.link/?u=079677 https://defs.link/?u=e855a0
EEVBlog BM235: https://defs.link/?u=12d498
Heathkit IT-12 Signal Tracer.
Racal Dana 1992: https://defs.link/?u=8eeeba
Bird 43: https://defs.link/?u=4b18f7
Sinadder 3: https://defs.link/?u=2bf1dd
PDVS2mini: https://defs.link/?u=869ba4
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HOPI: https://defs.link/?u=7fab55
PeakMeter PM6252: https://defs.link/?u=59ef66
HS1010: https://defs.link/?u=10c699

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