Electronics > Beginners
Identification of diode in a form I've never seen before
magic:
Seems about right. You forgot R415 which charges C409 but who cares ;)
And yes, R413 is 270Ω not 2.7 :palm:
Maybe it's time to just put this diode back in and see how many volts it drops?
moothefish:
Wow, you guys are great! Was not expecting anyone to try and actually create a schematic. What values did you need specifically? The issue I was having was that after about 5-10 minutes of running, the audio would start cutting out and this god awful hissing\rumbling noise would come and go in one of the channels and to a lesser extent both channels. After recapping and swapping all the transistors between channels to see if one was leaky, I found out that moving the diode pack on the channel with the issues caused the noise to change dramatically, and i could get it to appear and disappear by moving it. I thought it was the solder joint or the trace but i verified the connection and desoldered it several times with no change.
Happy to put the diodes back in and do some more checks. Dumb noob question though, If i put the diodes back to measure voltage drop, what points on the board should I measure between to get the best reading? Just across each leg of the mystery diode?
As for the NEC history of Rank Arena, I did already try looking at old NEC gear but couldn't find anything that used the same circuit as this. I'm sure its out there somewhere, just haven't been able to find it in my searchings as of yet.
RoGeorge:
Why would a diode have a package that does not distinguish between anode and cathode?
PA0PBZ:
--- Quote from: RoGeorge on January 11, 2020, 09:43:54 am ---Why would a diode have a package that does not distinguish between anode and cathode?
--- End quote ---
You missed the white dot?
RoGeorge:
That's weird, I missed it indeed! :o
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