@13:30 pin 15 looks like a DC supply to me, as it has an inductor on it (L1) to block RF backfeeding out of the rail. Pin 17 also looks like a supply rail of some kind, possibly an enable or bias
Nice project- hope you keep moving it forward… was glad to see the voltages you measured on PB-1076, the rectifier board under the power XFMR, they’re very close to what I measured on mine. Also, your voltages on PB-1314A, the voltage regulator/xtal calibrator board look similar to mine on the voltage regulator part of the board anyway, those are pins 1-14 and 18. The other separate circuit on that board, the xtal calibrator, are on pins 15-16-17 and that circuit is grounded by the screw on the top of the board to the side of the final amplifier cage, like the other screw grounds the regulator circuit as well as pins 1 and 18 ground the voltage regulator circuit. Wondering if that missing screw should be put back in. Also had a major receive problem on my FT-101EE, found that the fuse lamp, PL4 on the schematic, was open. The fuse lamp is inside the plastic holder on back of the radio right by the big antenna connector, a 16 volt bayonet-type lamp. It protects the rx front end from being overloaded accidentally. New lamp & bingo, the receiver came up. Keep up the good work- enjoying your video…
I have one as well that I will be refurbishing. So it's helpful to watch a few videos and read a few write-ups on-line to bring me up to speed about what's where and any common failure modes before I get to work on mine. I've always found it handy to make my mistakes second hand. In the past that has caught quirks like speakers that are routed through the mic switch. That one explained why a rig was silent the first time I turned it on, before getting into working inside it seriously. Thank you for this video.
I've seen a couple videos that helped make sense of directions in service manual and general how to use. Oddly some are quite old but didn't pop up when searching a year ago. Hopefully I resolve this to add to your knowledge base!
@32:00 the RF level there would be in the region of 100s uV or maybe low mV
@13:30 pin 15 looks like a DC supply to me, as it has an inductor on it (L1) to block RF backfeeding out of the rail.
Pin 17 also looks like a supply rail of some kind, possibly an enable or bias
Yep voltage on one or both enable each frequency
Nice project- hope you keep moving it forward… was glad to see the voltages you measured on PB-1076, the rectifier board under the power XFMR, they’re very close to what I measured on mine. Also, your voltages on PB-1314A, the voltage regulator/xtal calibrator board look similar to mine on the voltage regulator part of the board anyway, those are pins 1-14 and 18. The other separate circuit on that board, the xtal calibrator, are on pins 15-16-17 and that circuit is grounded by the screw on the top of the board to the side of the final amplifier cage, like the other screw grounds the regulator circuit as well as pins 1 and 18 ground the voltage regulator circuit. Wondering if that missing screw should be put back in. Also had a major receive problem on my FT-101EE, found that the fuse lamp, PL4 on the schematic, was open. The fuse lamp is inside the plastic holder on back of the radio right by the big antenna connector, a 16 volt bayonet-type lamp. It protects the rx front end from being overloaded accidentally. New lamp & bingo, the receiver came up. Keep up the good work- enjoying your video…
Thanks mate, will look at those screws. Bulb is ok but I have another theory to test because of the melted RF in wire.
@10:40, those small grey caps are likely bad, that brand doesn’t last that well, if I see those in a radio I replace them.
That board is working, maybe I should check all caps although anything RF related won't be electros I don't think...?
I have one as well that I will be refurbishing. So it's helpful to watch a few videos and read a few write-ups on-line to bring me up to speed about what's where and any common failure modes before I get to work on mine. I've always found it handy to make my mistakes second hand. In the past that has caught quirks like speakers that are routed through the mic switch. That one explained why a rig was silent the first time I turned it on, before getting into working inside it seriously. Thank you for this video.
I've seen a couple videos that helped make sense of directions in service manual and general how to use. Oddly some are quite old but didn't pop up when searching a year ago. Hopefully I resolve this to add to your knowledge base!
@40:00 make sure the clarifier is set to its centre position to avoid a frequency offset
Yep clarifier has been turned off as needs to be during calibration
Just started watching, will see if I can spot anything to assist you if you haven’t got it sorted yet.
I do the same ....if i cant fix it in a day or two it goes on the thinking shelf.......good work.....
YoU CaN DO ITTTTT👍🏻👍🏻👍🏻