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Marantz 2600 Refurb Thread

rBuckner

rBuckner

Luv 2 Restore
Subscriber
Hi all Marantz friends! As you might have seen in my guessing game thread, I've been privileged to receive a 2600 to rebuild. It actually works pretty well so it won't be as hard as txturbo's resuscitation unit. Still, there aren't many 2600's and the unit's owner requested the thread so here we go.

With the covers off, the insides come into view and have a modest amount of dust and no sign of liquid spills. The slow start relay connector is loose from the chassis but the relay was firmly seated in it.
WillMarantz2600 007.JPG
Some interesting feet are on the bottom cover.
WillMarantz2600 006.JPG
At this point I fired it up to test it before doing any more disassembly and heard exactly nothing. Plugging in short jumper cables from Pre Out to Main In got me sound so the switching contacts are either really dirty or sprung. It sounds very good as is so no miraculous improvement will be had. The scope display isn't quite right but, hey, we have some action! This is with no signal.
WillMarantz2600 001.JPG
This is with audio. The tuning settings try to work which is nice.
WillMarantz2600 002.JPG
WillMarantz2600 003.JPG
As noted in the other thread, some of the switch caps are different sized.
WillMarantz2600 005.JPG WillMarantz2600 006.JPG
On the lower right side, the two screws that fasten the side rail to the sub-chassis are missing.
WillMarantz2600 007.JPG
The scope tube is out.
WillMarantz2600 008.JPG
A handy tip: when you remove knobs, place them in an ice cube tray to keep them safe and in the place they came off.
WillMarantz2600 009.JPG
 
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There is a 10 picture limit I just found out about! No problem!!

Next, the power supply board will come out.
WillMarantz2600 011.JPG
WillMarantz2600 012.JPG
I had the connectors off of the board atop the heatsink tunnel and noticed there were only 2 out of 4 screws holding the board down. Also of note are the light blue caps, they're Xicons so someone has done some work in this 2600! There are some on the "outside" amp board too.
WillMarantz2600 013.JPG
WillMarantz2600 014.JPG

So tomorrow on Friday, I will blow out the dust and wash the chassis down. It will be so much nicer to work on a clean unit!! Also I'll get the two removed boards cleaned up, then it will all have to dry out 2-3 days before the recapping can commence. Fun, fun, fun!
 
It is so nice to see another one saved from extinction, I'm amazed by how much 70s gear that is still in existence.
:lurk:
 
Garsh! Thanks folks...
latest
 
Back to it now. Got the flux all cleaned off the back of the power supply board.
WillMarantz2600 001.JPG
The flip side still has that old glue on it still. Soaking in rubbing alcohol didn't phase it one bit. I hear acetone sometimes works but that's such a harsh chemical I won't use it.
WillMarantz2600 002.JPG
So I use a well used smaller flat tip screwdriver and pry it off at the most flat of an angle as is practical. A Q-tip and some alcohol do get off the last small bits though.
WillMarantz2600 003.JPG
Did you catch that not all of the electrolytics were removed? They were after this picture! Here's all of the glued on ones with the worst ones at the bottom - the leakers and criminally swollen ones!!
WillMarantz2600 004.JPG
Also to be done is swap out the shady 2SD313's for the better new OnSemi MJE15030's and fresh thermal grease.
WillMarantz2600 005.JPG WillMarantz2600 006.JPG
All new fuses were installed for reliability. All of the old ones were originals so no trauma in the past occurred. I used all Nichicon 105C rated caps from the PW, PM and HE series.
WillMarantz2600 007.JPG WillMarantz2600 008.JPG
Next up is the slow start / peak LED meter board that sits atop the heatsink tunnel. Scroll back up to see how dirty it was. Along with re-replacing the Xicon caps some shop put in there, there are some epoxy "blob" diodes/varistors to be replaced. It takes two 1N4148 diodes to simulate them and here I have some taped down to the workbench for soldering together. A minimum of heat was used with such short leads. May as well do some extra sets.
WillMarantz2600 009.JPG
There, all updated and clean.
WillMarantz2600 010.JPG


That's all of the rebuilding until I can power up again. The chassis has had one full drying day so it's too soon for that. There is some hand cleaning to be done on that and I'll post an overall shot once it's all nice and pretty in a day or two.
 
Randy,
Beautiful work on the 2600! Those 2SC313 transistors are a nightmare. I had issues with them on my 300 DC.
 
That power supply board is packed pretty tight, no wonder those poor caps got baked. Nice looking rebuild so far.
 
I have the 2600 manual scanned now but I can't upload it to the AK database. It seems that my login won't work for it and I don't see a way to request a new account. Suggestions? It looks like the AK database was not updated with the rest of the web site.

The manual is separated into three parts.

Main service manual, color at 300 DPI scan saved to 50MB pdf.

2600 USA schematic, single sheet, 600 DPI scan saved to 32MB pdf.

2600 EURO schematic, single sheet, 600 DPI scan saved to 32MB pdf.

The scanning took about 3 hours, mostly because I was screwing around trying to get an optimized scan. I dragged a printer/scanner home from work to do the scanning because kinkos wanted and arm and a leg and I did not feel like standing there doing the work (I was not about to hand a virginal 2600 manual to the kinkos employe!). The scanner I am using has a tabloid size bed and a sheet feeder, very handy for this job. The USA and EURO schematics are stitched together to make a single sheet... Each one needed to be partially scanned since they exceeded the length of the scanner bed. I saved them as .png files then used a free program appropriately called "Panorama Stitcher Free" to combine them. The stitching program automatically lines everything up and gives a seamless picture in jpeg format at about 150MB. I converted them to pdf's and dropped the size down. A couple of the pages of the manual are scanned twice due to the way the manual was folded up.

I'll scan the 2500 tomorrow.
 
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