Marantz NR1601 No Sound, Schematics attached.

[Benass]

Certainly! Here's a revised version of your text:

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I own a Marantz NR1601 receiver, but unfortunately, I'm experiencing an issue with no sound coming from any of the outputs. I'm seeking assistance to identify the most likely cause of the problem.

The unit powers on without any issues and seems to be functioning properly. I've noticed that the relay clicks after about 10 seconds, indicating that it's going through its startup sequence. There are no visible signs of damage, and I don't detect any burnt smells.

While the schematics provided are detailed, I'm feeling a bit overwhelmed by the complexity of the device and could use some guidance on where to focus my attention.

I must admit, I'm relatively new to troubleshooting Sound equipment, so I'd appreciate it if the explanation could be kept simple. Additionally, I'm having difficulty following the troubleshooting guide for addressing the lack of sound. I'm finding it challenging to understand which parts I should be measuring.

Any assistance or advice would be greatly appreciated. Thank you in advance for your help.

[Benass]

Manual can be downloaded here. Its 36mb and to big to upload.

[petehall347]

have you gone through the manual to see how to check errors logged ?

[Benass]

(2) For ASO (when the last protection incident was ASO protection)
FLD P R T : A S O
Cause: The line between speaker terminals is shorted, or use speakers having impedance less than that specified.
Supplementary information: As the excess current is detected after operation of the speaker relay, the shorted
speaker terminal and the connected speaker can be identified.
Turning on the power without correcting the abnormality will cause the protection function to work about 5 seconds
later and the power supply will be shut off.

this is what i i have as error.

[petehall347]

did you try different speakers ?

[Benass]

Yes, speakers I'm using for testing is 8 ohms standard basic. And they working.

I looked through schematics, and considering to disassemble entire front, remove radiator to get access to transistors and diodes.

Can't measure anything thro outputs becoz there are relays between transistors and outputs.

Also this thing is big and everything is cramped inside in a small factor. Annoying device to say the least