MTX 1501D problem power supply

[Perry Babin]

yes

 

[yoppi]

1,2v and -1,2v

 

[Perry Babin]

Do you have an oscilloscope?

 

[yoppi]

Yes

 

[Perry Babin]

With nothing connected to the amp, what is the resistance between the shields of the two sets of RCA jacks?

 

[yoppi]

RCA connector infinite resistance between red and white RCA connector

 

[Perry Babin]

Are D198, D199 and the large resistor between them in the circuit?

 

[yoppi]

if they are. I have checked and are correct.

 

[Perry Babin]

Measure the resistance between the point shown.

 

[yoppi]

Continutity

 

[Perry Babin]

Any resistance less than infinity can be considered continuity. Do you mean that you read 0 ohms?

 

[yoppi]

ok now I understand. the resistance is 1,5ohm

 

[Perry Babin]

If I understood correctly, you stated that you replaced the two 0.22 ohm resistors for the low voltage supply. Is that correct?

 

[yoppi]

if 2 SMD resistors are replaced.

 

[Perry Babin]

Did you re-check them after applying power to see if they opened again?

 

[yoppi]

if, now have their correct value ...

 

[Perry Babin]

There is a language barrier. Please take the time to more clearly answer the questions.

 

[yoppi]

Sorry, resistors 0,22ohm work well

 

[Perry Babin]

What signal do you see on the center leg of Q471 (with your scope)? It should be a square wave.

 

[yoppi]

Good morning from Spain

Do you refer to FET 471?


Regards.