Tascam UH-7000 power supply EMI (noise): how to improve? (SOLVED)

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Jan 20, 2025
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Tascam UH-7000
Hello! Happy New Year!

Tascam UH-7000 that I own shows noticeable interference from its' power supply unit. Mostly the left channel is affected (when an analog input is used with higher gain on it).
The internet search gives an advise to swap the STR-A6252M PSU controller chip (67 kHz) with the 100 kHz version - the STR-A6259H.
I did this but the noise level only increased.

Where can I find an official PSU schematics? Are there any PSU mods recommended by Tascam or the community?

Thank you in advance!

Warm regards,
Anton

PS
The solution:
- two mods required, the STR-A6252M for STR-A6259H replacement and the re-soldering of C018 capacitor in parallels to C009, check with the silkscreen on the PCB.
 
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