Parasound DR-40 stuck in standby mode fix

ham1 · 16th March 2010, 12:10 AM

If anyone has a Parasound DR-40 that is stuck in the standby mode (red LED), check resistor R020. The value of this resistor should be 12K ohms. I recently repaired a receiver with this problem and the resistor had changed to 330K ohms. This caused insufficient voltage to the switching transistor that energizes the standby/operate relay. This resistor is located on the left side of the circuit board near the relay and main line fuse. Shorted audio output/driver transistors can also cause the unit to stay in standby.

dbshortwave · 8th February 2012, 01:17 PM

Change the caps in this area or replace them all in this receiver. DON'T change that resistor its suppose to be a 330K ohm.
2,10uF @ 25v and 1, 45uF @ 10v
They are part of the delay / timing circuit.

The radio isn't marked for this but the amp section fuses are 5 Amps.

Do your normal checks of this radio; outputs, FUSES, check your caps etc..

16th March 2010, 12:10 AM	#1
ham1 diyAudio Member Join Date: Mar 2010	Parasound DR-40 stuck in standby mode fix If anyone has a Parasound DR-40 that is stuck in the standby mode (red LED), check resistor R020. The value of this resistor should be 12K ohms. I recently repaired a receiver with this problem and the resistor had changed to 330K ohms. This caused insufficient voltage to the switching transistor that energizes the standby/operate relay. This resistor is located on the left side of the circuit board near the relay and main line fuse. Shorted audio output/driver transistors can also cause the unit to stay in standby.

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8th February 2012, 01:17 PM	#2
dbshortwave diyAudio Member Join Date: Feb 2012	Change the caps in this area or replace them all in this receiver. DON'T change that resistor its suppose to be a 330K ohm. 2,10uF @ 25v and 1, 45uF @ 10v They are part of the delay / timing circuit. The radio isn't marked for this but the amp section fuses are 5 Amps. Do your normal checks of this radio; outputs, FUSES, check your caps etc..

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