Marantz 2385 Receiver Repair And Restoration
This Marantz 2385 needs some repairs along with restoration both cosmetically and electrically. Lot's of different issues made this unit a challenge.
This Marantz 2385 solid state receiver is pretty dirty inside. I'll get some of the dust out before I start troubleshooting.
I have removed the faceplate for cleaning. I used warm water and dish soap followed by mother's aluminum polish.
Any repair or restoration involves changing the old lamps With the faceplate of the Marantz 2385 removed the fuse lamps can easily be replaced.
Don't forget to clean up the decades of dirt and dust that collects everywhere. No better time as everything is already apart.
This Marantz 2385 solid state receiver is looking better after some dish soap and water.
I use a small clip on LED light to help see in the dark areas like when I am cleaning the push button switches.
Do your Marantz meters glow green instead of the original blue? It's because your original white vellum paper has turned yellow.
There is adhesive holding the meter. Use the point of an x-acto and slowly work the point between the meter and the case to loosen.
You will need to unsolder two wires from each meter to remove them from the Marantz 2385 receiver.
The image below shows the old vellum paper that was removed during this Marantz 2385 restoration and the new vellum paper.
Changing this paper is worth the effort. The new vellum paper has brought back that Marantz blue glow.
The audio muting board and soft start board had all electrolytic capacitors replaced. The soft start relay was cleaned and reinstalled.
A part of any vintage stereo restoration should be replacing the electrolytic capacitors in the power supply as shown below.
The power amp section had an issue and had to be removed. Also a good idea to label the connectors for easy reassembly.
This Marantz 2385 had it's share of issues including two open resistors on the power amp assembly.
The power amp assembly is back in the Marantz 2385 and now we have sound. Idle current and DC offset looks good.
Be careful and take no chances when taking measurements. Shorting leads together in this part of the Marantz 2385 is not a good idea.
The FM section was broke also. Replacing a bad transistor got the FM working properly.
This Marantz 2385 is a little beat up, a little crusty but ready to be bench tested.
Nice blue glow and ready for some music. This Marantz 2385 solid state receiver repair and restoration is complete.