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Yaesu 101E power plug wiring

Jimbo165

Active Member
Jun 1, 2012
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73
Southeastern Michigan
I bought a Yaesu 101E a couple of days ago had a power cord pluged into it . I went home and plugged radio in and poof smoke big time. Replaced 2 capacitors and a board copper ribbon going to them. I believe some idiot wired the power plug for 12v and put a 110v plug on cord. Here is a picture of it for a better opinion yours. I used a power cord from my other 101E but still cannot get radio to work and new capacitors get hot help please.
thumbnail (26).jpg
 

One common problem has to do with the numbering of the pins. The american-made plug starts from the right, looking at the rear of the socket end. The japanese-made equivalent numbers them from the left.

Or maybe I'm remembering that backwards. Takeaway is that they are opposite.

Might slide back the cover of the 'other' plug that you know is correct and see how they compare.

The published diagram is for the original jap-made plug. If you wire up an american-made plug by those numbers, you get a hookup that's a mirror image of what's correct.

Haven't seen this in a long time, but I do remember you get smoke.

This radio is reaching the "awkward" age where simply plugging it in for a smoke test is a hazard. We start with a current-limited 1-Amp 12-Volt bench supply and gator-clip power to the whine choke under the chassis near the center-rear. If the transistorized part of the radio will run properly, it's time to power up the AC cord with a variac and a small-size breaker in line.

If the new capacitors get hot, this suggests that maybe the rectifiers that feed into them got damaged before the new caps were installed. If so, they could feed AC into the polarity-sensitive electrolytic caps. Might permanently damage them, might not.

Usually does.

Have a look at the primary hookup on the main power transformer. Should have the "117" taps connected. Parts of Japan use 100 Volts, and if someone moved the wires to those lugs, that would cause headaches.

73
 
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Thank you nomadradio I found 2 burnt diodes on rectifier board and that stopped capacitors from getting warm but now R 2 a resister on board burning up. Looks like has something to do with bias circuit . Also power tubes 6js6c not lighting up either looks like no filament voltage. Could I pull out board and just wire up radio plug for 12v and use a power supply? Or leave board in but use 12v? No one around here to repair these old tubers and I am crazy about them. Thanks for your help on this forum.
 
Well the r2 resistor was getting hot because a diode in bias circuit was bad. I did wire up a 12 plug and ran radio off a power supply but no difference the 6jsc6 tubes still does not have filament voltage yet. Thank you BJ for sites but if I cannot fix it myself will just scrap it out and sell the parts but prefer to have it working and me using radio on 10 meters. Thank you all for the help so far but I am still hanging in there on a fix.
 
Today checked voltages at rectifier board and there are 2 places that say 10.5v and I have no voltage at them. Wire coating burn off one wire and it was going to diodes that had burned up when 110 was applied instead of 12v. Wire not burned thru and still connected. Could transformer be problem? If so it is only 10.5v part because all other seems ok. Any ideas? Thanks
 
Any time this kind of surge voltage happens, you pretty well need to test each and every rectifier diode in the radio's power supply. And any filter cap that was connected to a diode that tests bad should get replaced whether it tests bad or not. A shorted rectifier will pump AC voltage into the DC-only filter caps. Not healthy for them.

Anything short of a "scorched earth" approach, testing every power supply section that feeds off the power transformer will usually miss one or more bad parts. Turning it on with a shorted rectifier or filter still in the radio can cause additional damage when power is applied.

I have a FR-101 receiver that had 120 Volts applied to the 12-Volt power cord. It was pretty much toast. Too few undamaged circuits to justify repairing it.

73
 
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nomadradio I do not have 10.5v ac coming out of transformer lug. Something must have happened inside it . I have bought a small 10.5v ac transformer on ebay and am going to see if I power up the 10.5v ac on rectifier board if radio will start working. Transformer has 2 white wires 10.5 vac/350mA and 2 red 115vac wires.
 
That might or might not be enough current. It will be close. We ran that part of the radio on a power supply limited to a half Amp, so the current rating has no need to be higher than that.

And if that's the only damage to the power transformer you dodged a bullet on this one.

73
 
Well hooked up 10.5 acv small transformer and the 2 6js6c tubes still have no filament voltage and are not lighting up. I am taking a small break to decide if I am going to start piecing it out to get my money back but I absolutely hate scrapping radios. I may just put it on shelf till i learn more. I want to thank you nomadradio and others so much for your help I have learned quite a bit and still trying.
 
Ummm, the heaters in the final tubes are powered from a whole separate winding on the power transformer. There is a 12-pin accessory socket on the rear. It should have a plug with a jumper wire across two adjacent pins in that socket. That jumper completes the circuit to the heaters of the final tubes. If it's missing this would prevent them from lighting up when the AC power is hooked up right.

The 10.5 Volt hookup you tried might or might not make any of the rest of the radio come on. Depends on where you connected it.

Oughta just shoot a picture showing where we clip the gators to power the solid-state parts of the radio alone. Just need a 'round tuit'.

73
 
nomadradio you were right and radio was missing accessory plug at back that caused power to go to power tubes. I made a jumper after looking at plug on internet and all lighting up. I have manual and I am looking at it page by page to see if it is mentioned so far no. Now when I key mic I can hear myself on another radio but no transmit power showing on meter.. When keying up other radio the yaesu receive needle moves on receive but no sound . At least with your help I am gaining. I am going to start looking at ALC board and work from there. Thank you.
 
I would start with the meter in the "IC" position. This shows the DC "plate" current through the tube. Should have 120 mA when keyed in SSB mode with the mike gain at zero. If you can't obtain that reading, good chance the wattmeter will show zero when you put a carrier into it.

73
 
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