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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.
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