AV Surround Receiver NR1501

Marantz (Sound United LLC); Vista, CA

Data
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  • Year
  • 2009 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 351926

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Main principle
  • DSP, Digital Signal Processor
  • Wave bands
  • Broadcast (BC) and FM or UHF.
  • Details
  • Radio with other functions
  • Power type and voltage
  • Alternating Current supply (AC) / 230 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: AV Surround Receiver NR1501 - Marantz Sound United LLC;
  • Shape
  • Tablemodel, with any shape - general.
  • Dimensions (WHD)
  • 440 x 105 x 367 mm / 17.3 x 4.1 x 14.4 inch
  • Notes

  • The Marantz AV Receiver is a 7.1 AV channel system with seven 50 Watt analog power amplifiers, Dolby TrueHD, DD+, DTS-HD, four HDMI v1.3 inputs and one output,  Video Conversion for CVBS and Composite, Analog to HDMI scaling, Digital Optical and Coaxial Inputs,  Auto speaker setup (MRAC), Pure Direct audio,five analog audio inputs, Subwoofer output, and AM and FM-RDS RF bands.

    Nominal power consumption of 250 Watt, Standby consumption of 0.5 Watt.

    Includes the RC006SR backlit remote control.

     

  • Net weight (2.2 lb = 1 kg)
  • 8.6 kg / 18 lb 15.1 oz (18.943 lb)
  • Mentioned in
  • - - Manufacturers Literature (Service Manual NR1501 AV Surround Receiver, S0681-0V05DM/DG1305 Ver. 5)
  • Author
  • Model page created by Jose Mesquita. See "Data change" for further contributors.

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The model AV Surround Receiver is part of the collections of the following members.

 Forum

Forum contributions about this model: Marantz Sound United: AV Surround Receiver NR1501

Threads: 1 | Posts: 2

Many of these model series developed the same failure after some years of usage. The sound from the inputs, analog or digital, mutes completely; sometimes selecting a different input and coming back to the original input would fix the issue for a while; power cycling, trying to service reset the unit (hold Menu+down arrow for 5 sec) may actually make things worse.

Running the service self-test (holdn Menu+right_arrow for 5 sec) revealed a problem in the HDMI/DSP board. A "CHCK DSP" error was persistent, along with intermittent "CHK CPU" errors.

 

I followed the Marantz service manual troubleshooting tips, by starting with the HDMI/DSP board power supply Vcc lines checking.

Indeed most of the power supply Vcc lines in the HDMI/DSP board were faulty; despite the multimeter DC reading being close to the specified regulator output voltage, the oscilloscope readings were telling a different story - Huge 800mVpp RF oscillation was present.

 

Just by looking into the HDMI/DSP board  gave me the reason for the issue. Those infamous SMD aluminum electrolytic capacitors are used in this PCB board - After some years of usage and aging, I expect them to be faulty or out of specification, as they usually lose the capacitance due to electrolite leakage or else the ESR rises to unacceptable levels. Also they seems to be very temperature sensitive.

 

In my unit several of these SMD capacitors showed ESR readings well above the recommended maximum  of 0.5 Ohm for the installed DC regulators. I removed some of the filter caps to test them, and found out that the ESR was around 6 to 11 Ohm (!).

 

I decided to replace all of these 40 SMD caps in this HDMI/DSP board with classical high quality mini radial 105 degree low ESR electrolytic caps, to get rid of these SMD aluminium caps for good in my unit.

Keep in mind that this unit is a high quality model, with excellent choice of components and build quality. Good old high quality radial electrolytic capacitors are used everywhere - Well, with one exception...

The HDMI/DSP board looks to be supplied by some computer company to Marantz receiver operation specification. This board looks different from the rest of the receiver, with distinct components and assemblage technology, even the PCB color is different.

 

The mini radial electrolytic caps are larger in size when compared to the original SMD aluminium, but this HDMI/DSP board has enough free space underneath. I positioned the capacitors lying flat on the PCB to ensure maximum mechanical rigidity and minimize vibration. Ugly, but efficient.

After reassembling the unit, did a system reset and run the self-test. No more errors.

I let it run for the night on the FM radio. Then played again with the input selector, tested other inputs, powered cycled the unit dozen times. 

I then powered it down for several hours to let it cool down.

Tested it once again, before finally decided to install the cabinet cover, as I could not duplicate the above errors again.

Also the sound issues were fixed.

Jose Mesquita, 08.Jan.24

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