Yamaha CR-1020 idling current not adjusting

[Hifibythekg]

Right trimpot.
Solder spit tip right under cable looks different..

 

[Hifibythekg]

sorry,
"Solder spot top right under cable looks different.."

 

[Hifibythekg]

..concave

 

[avionic]

Lets see topside photo's of TR607's..

 

[Hifibythekg]

Hard to access a clear view

 

[Ylli]

and this problem existed prior to my recapping and cleaning of the PSU and Cap board

Skip it for now, follow avionic's suggestions. He'll get thing figured out for you.

 

[Hifibythekg]

Hey, Ylli, thanks for joining in and offering some help.
Yes, I'm holding on for an inspired solution from Avionic.
Have a good evening.

 

[avionic]

What did the OEM 2SA844 transistors look like ? Do you still have the old parts?

 

[Hifibythekg]

Yes, these are the readings for the original and replacements.

 

[Hifibythekg]

Same problem existed before and after replacement of trimpots and TR607 resistors

 

[avionic]

Same problem existed before and after replacement of trimpots and TR607 resistors

Guess that wasn't the problem..

 

[avionic]

Do you know if anyone else has been inside this unit ?

 

[Hifibythekg]

Don't think so, everything quite mint, little used.
Most of the caps I replaced had close to original values.

 

[Hifibythekg]

The TR608’s look like this.
Anything suspect?

 

[avionic]

Just wanted to verify the A1015's were installed correctly.

 

[avionic]

How much voltage are you seeing on the gray wires on the amplifier assemblies. ?

Caution : There is suppose to be around - 91 volts.

 

[mbz]

measure dc voltage between TP1 and GND/chassis

 

[Hifibythekg]

For this, do I place black probe on chassis, red probe on the gray wire on the ampboard?
"How much voltage are you seeing on the gray wires on the amplifier assemblies. ?"

 

[Hifibythekg]

For this, do I place black probe on TP1 , red probe on the chassis?
"measure dc voltage between TP1 and GND/chassis"

 

[mbz]

For this, do I place black probe on TP1 , red probe on the chassis?

Red probe on TP1, Black probe on chassis or any black speaker post, unit powered on.