Yamaha CA-810 Schematic Issues

[Yamaha5000]

Off the power transformer secondary there should be two blue wires and a green wire. Measure the resistance from the green wire to chassis ground. Should be less than 1 Ω.

Resistance value is 1.3 ohms

 

[Yamaha5000]

Have you replaced D805 and D806 ? If so, with what ?

WZ061 -- 6.1v zener @ 500mw

Both D805 and D806 have been changed out with WZ061

 

[Yamaha5000]

D805 ANODE

 

[Yamaha5000]

D805 CATHODE

 

[Yamaha5000]

D806 ANODE

 

[Yamaha5000]

D806 CATHODE

 

[Yamaha5000]

 

[avionic]

D801 & D802 WHERE OH WHERE ARE YOU?

Not needed evidently..Unless there soldered to the backside of the PCB.Undocumented production change.

 

[Yamaha5000]

Not needed evidently..Unless there soldered to the backside of the PCB.Undocumented production change.

They are soldered into place, I replaced them but now not sure with what, Also not sure of Anode/Cathode placement orientation.

 

[avionic]

They are soldered into place, I replaced them but now not sure with what, Also not sure of Anode/Cathode placement orientation.

1N4148 will get the job done.

 

[Yamaha5000]

Diodes are covered in plastic tubing.

 

[avionic]

Were they originally in there at those two locations ?

 

[Yamaha5000]

Were they originally in there at those two locations ?

Yes

 

[Yamaha5000]

I was just looking at them and they are 4148

 

[clinic-audio]

zoom

 

[Yamaha5000]

zoom

View attachment 1961627

I see a cap and zener diode missing from the board, why?

 

[Yamaha5000]

You don't by chance have a MACRO Lens? It is difficult to view the true colors on the resistors. Also one is missing and a couple are hidden.

 

[clinic-audio]

I have a complete board (second hand)

what do you need ?

 

[Yamaha5000]

Color code of resistors or values of resistors and their location on the Power Supply PCB section.

Maybe you could also sell me the complete board if it is working.

 

[Yamaha5000]

I have a complete board (second hand)

what do you need ?

You don't by chance have a MACRO Lens? It is difficult to view the true colors on the resistors. Also one is missing and a couple are hidden.

Please help me better understand the language barrier.