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- Need a schematic for a Fisher RS-717 receiver - 1 Update
| teknoskillz@gmail.com: Jul 22 08:42AM -0700 So I undertook the task of opening it up and unsoldering the old battery. Its out, however during the moving around of the chassis, the little square piece which is I guess the camera assy popped off - http://www.mediafire.com/view/w0y5fz0ixbg3x66/HPIM0482.JPG/file Tried pressing it back on but it dont seem to stay in place, so I am thinking using a tiny dab of contact cement in the corners and maybe a clothespin long enough to clamp it overnight. Also the piece that popped off seems to have a little bit of discoloring on the tiny lense, which probably would come off with some windex on a q tip. Was just wondering if that is ok or would alcohol be harmful to the lense? I took a peek at that tiny lense on the end of the cable, and its got several tiny smd caps mounted around the perimiter. At first they looked like some kind of edge guide...had to go to extreme mag to even see the detail. |
| eriknehamkin982@gmail.com: Jul 21 07:26PM -0700 I have a dvm, an analog meter, soldering iron etc.. I also have a app on my phone that can act as a signal generator, but I dont have a scope. I pretty much use it to run my ipod, or other music device through the aux, and it had been working great and sounded good until recently. I appreciate your help by the way. Thank you. |
| jurb6006@gmail.com: Jul 21 08:04PM -0700 Nine times out of ten "garbled" sound in one channel when the amp doesn't fry or go into protection is because of an open driver transistor. Well maybe 8 out of 10 times. Without a scope, the only way to test this is either static ally, which means the ohmmeter and the device not powered, or to measure the voltages in the amps while it is running, on a driver the voltage should only be a half volt or so, measuring from base to emitter. It may have forward bias (supposedly) on the base but the emitter is not there, it is more negative or positive than it should be. Except for certain circuits, like class C RF amps n shit, the emitter and base should always be within about a volt. Maybe 2, but no more. The exceptions are high speed switching transistors and that ain't what you got. You can still get 2SC3117 and 2SC1249 at Digikey cheap and they will handle almost any amp up to about 400 WPC. Sometimes it is the outputs, read the voltages on the bases and emitters of all of them in the output stages. Even with no signal, on3 of them is going to have more than normal voltage from B to E. Compare it with the other channel. Anyway, try a few things and get back to us. |
| jurb6006@gmail.com: Jul 21 04:17PM -0700 On Friday, July 20, 2018 at 9:10:32 PM UTC-5, John-Del wrote: > Fisher RS-717 with water damage. Guy wants it fixed for nostalgia's sake... > John Nobody has it on all the freebie sites I know. Perhaps SAMS ? Or would you rather elaborate on the problem and maybe do it without the print ? |
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