Sansui SR525, speed stable but fast

[czgagi]

Another tip...R032 (that on the left) reads ok? it feeds the COM node of the adjustment.

 

[raistlinmajere]

Huh, what is this fuzzy thing here? R018 . A quick check shows 1.1k across the R018 resistors.

Hmm. Seems like a false alarm, it's a speck of dust. Resistor and diode casing seems clean.

 

[raistlinmajere]

Another tip...R032 (that on the left) reads ok? it feeds the COM node of the adjustment.

I didn't lift a leg, but in circuit it reads as in service manual.

 

[raistlinmajere]

Thanks for all your suggestions guys, over the week I am going to lift all the resistors to confirm.

 

[restorer-john]

Check C009.

 

[raistlinmajere]

@restorer-john I have already replaced this previously (with a 50V rating). Just now, I have confirmed that it is continuous on the negative side with the WHT wire, and the positive side is continuous with C10.

 

[raistlinmajere]

Actually, I have trouble imagining how the switch works? It has 2 white wires (I assume from the power supply) but it doesn't seem to be directly connected to the 3-way selector. Are they supposed to be decoupled or am I not seeing a connection between them?