No experience whatsoever on this unit & hoping someone can help.
No audio from keyboard when , BD , SD , or Others selected ( see pictures )
No audio from keyboard when , BD , SD , or Others selected ( see pictures )
Attached Files
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Re: MC-505 , Roland drum machine , schematic please
the liquid spill is obvious - check for corrosion everywhere -
Re: MC-505 , Roland drum machine , schematic please
Hi & thanks
No liquid damage
Seem like a genuine failure .Comment
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Re: MC-505 , Roland drum machine , schematic please
nothing to see on the top, got a photo of the other side?
and that other board in the center too.Comment
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Re: MC-505 , Roland drum machine , schematic please
Have managed to source a service manual .
Will update with some info & more picture when i have a chance to work on it again .
Thanks once again for your advice .Comment
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Re: MC-505 , Roland drum machine , schematic please
Managed to restore missing functions with a system reset .
Power on while holding down SHIFT, then press ENTER. Note, this procedure takes
several minutesComment
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Repairing a Roland SPA-120 amplifier, a solid-state early-mid 80's part of the Roland Rack. The PCB is Labled AP-124B. Was thinking lytics would resolve the nasty output on scope but all tested 100% for values, ESR, and leakage (very surprised!). Symptom is nasty wave form on both channels in Stereo mode, but clean in single channel mono (BTL) mode. The Output transistors test ok at room temp, but still could be faulty once heated up. Anyway, a schematic and some test point voltages would sure save some time. Thx!
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Hi, Friends,
Recently i ve got a pos machine board and the problem was 3 USB ports out of 5 not working. When a mouse is plugged mouse light is worked, but not detecting.
So i changed bios chip from all working machine and then Usb PORTS work for few minutes. So any one of you have same experience with this board. please share your ideas,
and schematic if you have,
Model - XT-4015 ver F.
Thank you. -
OK, this is a long shot. I got this sewing machine cheap because it's end of line, ex-display, and had no pedal. The genuine pedal costs £60, while Ebay knock-offs go for around £15. So I went for the knock-off, it doesn't work, and I'm not sure whether it's the pedal or the sewing machine that has the problem.
Now this is an electronic machine, unlike the old fashioned sort where the pedal was a big resistor in series with the power to the motor. Here, the pedal is just (I think) a variable resistor fed with a 5 volt supply, and limited to a current of 5 milliamps. Assuming that... -
Hi everyone,
I am trying to fix a samsung washinmachine power supply main board.
I already replaced it with another one to fix the machine but i want to try understand the issue with the old board.
Therefore i hope to be able to get some help to explain what to check in order to troubleshoot.
The power supply board reference is the following: DC41-00189a
I have followed one thread (https://www.badcaps.net/forum/troubl...ingmachine-rel... -
Hey everyone,
I'm currently working on a mid-70s Sharp Electronic Digital Clock Radio, Model FY-70CH. I found the service manual online, printed it out, and have been studying it for a while. My main reasons for tackling this are: (1) I want to learn electronics and figured I'd start with something I had on hand, and (2) I want to fix its issues. Right now, the radio sounds awful, has about 5V DC at the speaker terminals, and the alarm time setting doesn't work. But I'm not asking how to fix these problems.
Instead, here's what's been bugging me so far:
The schematic...
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