Tanglewood T6 acoustic amp noise.

Hi,
I have a Tanglewood T6 acoustic amp on the bench with noise problems around the effects section.
Managed to trace down the problem down to U201 /RST Input (CS5340-CZZ) Analog to digital converter. Shorting C222 gets rid of the noise but turns off the amp effects, since /RST input is at low level, of course.
I removed C222 and R201, and the noise was still present. However, with those componentes removed, when I tap R210 leads with anything metal (a multimeter probe, screwdriver etc) Noise goes away and the amp works as expected.
What do you guys think could be causing this? Replaced R201 with a jumper and C222 with a new cap, but the problem remains.
Thank you for your help.
Best regards,
Fran
 

Attachments

  • T6 Schematic - 1 (2).pdf
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Last edited:
Olá. Estou com um equipamento desse em bancada também. Caso seja necessário verificar alguma peça a mais, só chamar.
No meu caso o defeito está na seção do amplificador, teria o esquema elétrico dessa parte? Áudio sai distorcido do TDA7294, já troque ele. No input está ok. Fontes simétricas em 32V DC.
 
diyAudio Moderator
Joined 2008
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Olá. Estou com um equipamento desse em bancada também. Caso seja necessário verificar alguma peça a mais, só chamar.
No meu caso o defeito está na seção do amplificador, teria o esquema elétrico dessa parte? Áudio sai distorcido do TDA7294, já troque ele. No input está ok. Fontes simétricas em 32V DC.
:cop: English please.

TRANSLATION -
Hello. I have equipment like this on my bench too. If you need to check any additional parts, just call.
In my case the defect is in the amplifier section, do you have the electrical diagram for that part? Audio comes out distorted from the TDA7294, replace it now. In the input it is ok. Symmetrical sources at 32V DC.