RDD between caps

[Karl vd Berg]

Good afternoon...
Does anyone know the purpose of the circuit (in green) in this power supply?
The 0.47/3W resistor and the two diodes are inserted in the GROUND track, separating the first two 8200uF capacitors from the other two further ahead...
I know that CRC is normally used in POS and NEG rails, but here in the GROUND track???
Many thanks in advance.

 

[egellings]

All I can think of is that it may be a diode-clamped inrush limiter.

 

[Mooly]

Could be for ground lift to reduce a hum problem.

 

[Karl vd Berg]

Thanks, @egellings and @Mooly ...
The Denon brochure for this model states "clean power supply", so I though that might be the reason...

 

[egellings]

Could be for ground lift to reduce a hum problem.

True.

 

[jean-paul]

It has no valid purpose as the schematic indicates there is no PE connection at all. Normally this is the way Audio GND is connected to PE to avoid ground loops but still reference Audio GND to PE. A so called ground loop breaker.

I think this is a design imperfection or a drawing error. Like the "EU model" and "120V 60 Hz" 🙂