Rhodes 73 Speaker Cabinet not functioning

[lizardmant]

I have a Rhodes Seventy-Three Suitcase model.  It worked fine for about 8 years until one day it didn't. It had not been moved. When I turned it on I got no sound output from the speakers except for kind of a "grunt" when it's turned on and a very faint sound from the keys (in addition to the sound the keys make when the piano is turned off).  The 1/4" jacks on the left side do not produce any sound when an exterior source is plugged in. Where do I begin this troubleshooting process? Thanks in advance for any help! 

Details:
I get a "grunting" type sound when the Volume is turned up and VERY faint sound from the keys.
1. Plug other keyboard into Rhodes amp – No sound.
2. Check for shorting tines – none shorted.
3. Plug harp into external amp both directly and from front panel output jack  – All notes play when plugged into external amp.
4. If I try to use the  ¼" output jack on the front of the keyboard, I get the same sound as straight out of the harp,
5. I plugged headphones into the headphone jack and it did not produce any sound.
6. Checked the cord connecting the piano to the amp with a meter and all pins and cables read good.
7. Checked RCA jack and sprayed with D5: Lastly, checked the RCA jack at the top left to see if it's loose, flimsy wiring or any heavy corrosion etc – none of these problems exist.

I've plugged a cable directly from the harp into an amplifier.  I get sound on all notes.

It doesn't seem to be an issue with the RCA connection.  No corrosion or bad connections as far as I can see.
All this has been done with the sound coming straight out of the harp.  If I try to use the  ¼" output jack on the front of the keyboard, I get the same sound as straight out of the harp, but if I plug an exterior source into the  ¼" input jack on the front of the keyboard, I get NO sound.

Thanks again , I appreciate your help.

[spave]

First off, what year Rhodes do you have? They used Peterson electronics in the older models then switched to Janus electronics for the later ones. Any solutions will depend on which you have.

For the Peterson's, the three main failure points are the preamp, power amps, and power supply. Right now based on your description I'd start with the power supply. However, if you are not familiar with electronics then taking your Rhodes to a tech will likely be the best option. Additionally, even if it is only the power supply you will likely need to replace/repair your power amps and preamp soon anyway. The electronics in any Rhodes are at least 40+ years old at this point and they were not built to be around this long without replacement.

[lizardmant]

The number inside the piano is 0151. Does that translate into January 1975 ?
Based on this, can you provide any more detailed information?
Thanks for the advice provided in the last response.

[spave]

Yes that would be the correct year. A 75 piano will have the Peterson electronics. I'd still recommend having an electronics specialist do the diagnosis but if you are set on doing it yourself then I'd recommend using the search function on the forum with terms like "Peterson" and "no sound" to read what others have done previously.

The two main US companies for the replacement parts are Vintage Vibe and Avion Studios. Avion also offers a mail in service for electronics repair that might be a good option for you as well. I had them rebuild my preamp and was very happy with the results.

Vintage Vibe link:https://www.vintagevibe.com/collections/fender-rhodes-electronics?page=1

Avion Studios link: https://www.avionstudios.com/rhodes?category=Rhodes+Electronics

[Will]

I had the same issue. You can read a report here :
https://ep-forum.com/smf/index.php?topic=10556.0
For all purposes.

I also updated all the electrolytic capacitors on the preamp PCB (mine is a Janus). It works fine so far. As Spave stated, I also recommend seeking the services of a professional technician if you are not familiar with the electronics field.