Need a schematic, service manual, and parts list if possbile
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The Problem: This player has a toggle switch to select between Stereo, Mono R, and Mono L. Regardless of the setting it outputs the sound to both the L&R audio jacks. In the Mono R position, the audio output level is normal (from both the L and R audio output jacks), in the Stereo position the audio output is about half the volume, and in Mono L, it's about 3/4 the volume. Something about putting it into Stereo mode is causing the volume to drop significantly and I can't figure it out.
The player processes the audio signal using two different reference frequencies. The "R"... -
As per title and also any tips on what to test first would be welcome on fixing this keyboard, which worked 100% and then upon the next power on, no display or response from keys, buttons, sliders, dials etc. However the Firewire audio interface section still works.
Thanks.10-14-2025, 01:42 PM -
I have a Steinberg UR44 audio interface that I had in storage for a few years, and now that I want to use it doesn't power on. I want to take this opportunity to learn electronics repair so I am trying to repair it for learning experience.
I am looking for guidance on how to proceed with troubleshooting the problem.
I have checked the original power supply with a multi meter and it works.
I visually inspected the PCB board and don't see any issues, except what looks like a possible broken fuse but not sure. I checked it for continuity it reads 97 ohms, but... -
I need to find out schematics diagram of Steinberg UR 12., pcb printed these numbers YAMAHA YF989 ZM60700, I searched everywhere but I didn't find the schematics of this USB audio interface, If anyone has it please let me know and if anyone has similar schematics diagram please let me know as well.
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Hi
I have this Lantec PULSE 386 subwoofer I got a while back laying around awating repair for quite some time. Sadly it's missing it's original speakers which it came with.
After plugging in the mains, the LED on the volume controller lights up. When I plug in the 3.5" jack cable to my soundcard (confirmed to work), I get no audio on the subwoofer (nor the speaker jack at the back).
The PCB is quite simple. There is a UTC4558 amp and two D6282 audio amps. When I put my finger on the UTC4558 I can see and hear the speaker "fart". Although, the left...11-29-2025, 04:15 AM
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