Hey guys, its been a while since i have been to the forum.
i come searching for info on the Behringer PMP1000 mixer and found this thread.
I...
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Always happy to help if i can although i must tell you, i know little. I never got this fixed and its still sitting on the bench collecting dust. Got side...
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Outstanding information!! Thank you very much!! Nice run of tests for calibrating the mics also including the schematics for the test gear. Amazing!!
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So this is the schematic i am going to build from using the second schematic listed.
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Not much info. But i did find this. http://recordinghacks.com/pdf/sennheiser/MKH-415t.pdf
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Sennhieser MKH 815 T Power supply.
Ok i got these mics some time ago from a couple different sources. I have five of them in total to include
Two MKH815T complete
Three MKH415T...Last edited by greenmeanh1; 01-20-2018, 09:54 AM.
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Yet another long winded post.
Geez, I went to my local electronics spot in Toronto and they don't have 33uf 100v caps. They have them on order but...
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I have added an updated drawing of the amp board schematic. I think i have it correct. If anything doesn't look right please let me know!! I have edited the...Last edited by greenmeanh1; 01-13-2018, 03:48 AM.
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A few updates. I worked my way through the upper failed amp board and tried to prove it to the schematic dmeek had posted way earlier in this thread. Fairly...Last edited by greenmeanh1; 01-12-2018, 10:30 AM.
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Disconnected the +-66v supply from both amp boards and the -23 volts disappears off the transistors and the sp relay click on. Still have -66 and +49 instead...
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I have 26 volts at the speaker out. Ruled out the speaker relay after bypassing. It was doing its job and was not leaking anything back to the transistors....Last edited by greenmeanh1; 01-08-2018, 06:39 AM.
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Found the problem, One 33k resistor open on the suspect amp board. So fixed it and bench tested it for hours so i was pretty happy but when i tried to put...Last edited by greenmeanh1; 01-04-2018, 12:51 PM.
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OK good call. I did that test as you mentioned above on the outer legs of the transistors. I get the same readings on all four amp boards. They all measure...
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I meant to ask if those tests i just did tell anything at all about the transistor health or if there is a better way of doing it. I could pull them and test...
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Checked the AC ripple and there is none. Scope shows a nice clean DC signal on all four amp boards. Other than the positive on the left side shows +44v instead...Last edited by greenmeanh1; 12-24-2017, 09:30 AM.
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So in the M 800 there are four amp boards, two on each side of the amp, or two amp boards on the left and two amp boards on the right. There is a pair of...
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OK, So interesting. Disconnected the lower amp board -66 and the+44 (should be 66v) volt lines and had the scope wired to the speaker as before and the top...Last edited by greenmeanh1; 12-24-2017, 01:40 AM.
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Did that. I got the same readings as before. -66v on both the orange wires to both top and bottom amp boards but only +44 volts to the blue wires on both....
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I was thinking because the amp has two amp boards on each side (one for positive and one for negative) perhaps the board that provides signal the ground side...
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OK something happened and i cant explain it. So, i was doing a few tests with my scope (old Tektronics 456) At one point i put the probes on the speaker and...
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