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#1
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IIRC the HOT base will look more like a shark tooth than square. It will be there. 73 Zeno |
#2
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I thought I wasn't supposed to go near the HOT w/out a hi voltage probe? Also, whose idea was it to make a transistor with the shell being the collector? Wouldn't it have been easier to make it a three lead unit and then you wouldn't have to worry about isolating it so as not to short to ground? I looked over the thing carefully and found the case is being energized by a lead on the screw hole.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
#3
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The transistor collector is the substrate of the die, which has to be soldered to the case to get good thermal conductivity to the heatsink. Hence, the case will be connected to the collector. There will be an insulating washer and some thermal-conducting (but electrically insulating) grease. |
#4
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Will the waveform I get be enough to see the ringing if it exists?
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
#5
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All you will see at the collector terminal with the HOT removed will be a DC voltage, around 150V or so.
You should see a horizontal drive waveform at the base terminal, but without the B-E junction drawing current, the waveform probably won't look right. |
Audiokarma |
#6
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Okay. Just trying to figure out what kind of testing I can do while waiting for the new HOTs to arrive. I'm pretty sure I blew it up when I shorted the wave shaper transistor. I'd like to test the wave forms of that module to make sure it's working properly before I put the HOT in. Hopefully the waveforms of that module will be unaffected by the removal of the HOT.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
#7
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Edit: have you tried experimenting with auxiliary grounding wires just to see if the on-screen pattern changes? If you see a change, it will help to identify hot spots for the ringing. |
#8
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If I can get the ringing waveform back with the HOT removed, I'll continue my troubleshooting while waiting for the new HOT.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
#9
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Okay, the darn Postal Service can't even get a package here from FL without misrouting it to IL. Looks like my new HOTs won't be here until tomorrow or Thursday. In the meantime, I'm going to build me a dim bulb thingy. I have a ceramic ceiling socket, outlet and lamp cord. I will run the hot through the socket/filament and into the hot side of the outlet. The neutral goes directly to the neutral of the outlet. In the socket will be a 75w incandescent bulb.
Now from most of the replies I've seen about power usage for this chassis, the bulb should restrict the amperage to .62, is that correct? So there should be no risk of the unit drawing too much power and killing the new HOT, right? And what exactly happens if it tries? The bulb should be a full bright with the normal current draw of the chassis, so how do I know if it's trying to take too much? Is a 100w too much? I believe that would be a draw of .83 amps. I'll post pics of it when I'm done.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
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