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I can rewind and fast forward but not play. I figure it is either the capstan motor or the belt. I am going to order the service manual. Is this something I can fix or do I need to take it with the service manual to a stereo repair shop?I bought my first Dokorder 7100 from J&R Music World for $400.00 in 1975, about a year later I traded it in on a Teac 2300SD that had built in Dolby. Big mistake, as the 7100 sounded better on non-Dolby tapes. It is my favorite Reel to Reel of the past. I love how easy it is to thread, the pinch roller retracts so there is no maze to thread the tape through, just drape it from the supply to the take up reel. And it is a beautiful gray with white lettering and black knobs and head cover.
Anyway I only got to use it about 5 days before the capstan quit turning in the middle of a tape. I made an excellent 90 minute tape using Ampex 641 tape and listened to two dozen pre-recorded RTR’s. The tape I made was 7 ½ ips from DVD-Audios and the copy actually sounds better than the original, it has more and deeper bass and a larger soundstage and center imaging is larger and more real. How is this possible? It doesn’t seem logical unless it’s because of Digital's greater channel separation. Maybe worse channel separation gives better center channel fill? Any ideas?
So what should I do about my capstan?
Thanks in advance,
"Analog is Music, Digital is mathematics"
Happy listening,
Teresa
Follow Ups:
the starting capacitor on the capstan motor may be dried out and need replaced. i have a simular problem with mine and thats what i believe it is. with the back off can you see the motor turn?
take off the front and with the face plate off I can see the motor is at a dead stop. A second layer has to be removed to get at the motors and I was too chicken and afraid I would not get it back together correctly.I took it to a "Classic Equipment Specialist" Sun Valley Repair, they specialize in Vintage equipment including reel to reels.
Gene Tinsley the tech is very nice and he owns the Dorkorder 8140 a 4 channel Quad Reel to Reel and loves the reel to reel format. He also told me he works on Turntables, cassette decks and even 8 Track decks. Plus he says can get any tube I am looking for whither available or not.
Problem he is backed up so it may be a month before it is fixed. Parts are also not a problem as he has most of the parts for all the old machines in stock, if not he can either get NOS or replacement.
He prefers Vintage equipment, as the build quality is so much better.
"Analog is Music, Digital is mathematics"
Happy listening,
Teresa
Teresa,What is your mechanical capability??
If you can figure out how to open up the back and look inside, you should be able to determine if the problem is in fact a belt.
I don't know the innards of the 7100, but my old PRB belt cross-reference guide indicates that it uses two round (cross-section) belts, their "universal" replacement numbers are OA9.4 and OB17.2. The OB is thicker than the OA and I'd guess that it is the drive belt and the OA may be the belt that (somehow) drives the counter. You should be able to find replacements by doing a websearch on rubber belts - turntable belts or something like that.
Replacing them will probably involve unscrewing motor mounting bolts lifting up the motor so the belt can be slipped around a pulley on it and then around the capstan flywheel.
This isn't rocket science - just careful looking and deciding what and how to do the work. Correct tools help.
Good Luck
Charles
I took the back off and cannot get to the motors there is a metal cage in front of where they would be inside the cage are printed circuit boards. Looks like I'll have to wait for the service manual. It is very clean and looks great inside, it also looks almost new outside. I bought it from an eBay seller that speciallies in Reel to Reel parts and restoration. He claimed the machine was lubracated and serviced, and based on appearance and the great 90 tape I made I believe it was. Just my bad luck it quit working just days after getting it.I ordered the Service Manual yesterday, so I will look it over to find out how to get to the capstan motor which logically be directly behind the capstan.
"Analog is Music, Digital is mathematics"
Happy listening,
Teresa
If you don't mind my asking, which ebay seller did you buy it from? I have bought a couple of decks on ebay from a guy who is extremely knowledgeable and helpful, even after the sale is made. Perhaps you could contact your seller for advice.
He doesn't have an "About Me" page, but I would guess he fixes up Reel to Reel decks and sells parts from the ones he can't.I ordered the Service Manual from another eBay seller and will look inside to see if I tell if it's the belt or the capstan motor that went out. But it was all sounding so great, I was listening to a London ffst tape and it just stopped. The deck was well cared for even inside it looked great and outside it looks almost brand new.
I hope it is an easy fix and I can get back to spinning reels again, here is a link to his store.
"Analog is Music, Digital is mathematics"
Happy listening,
Teresa
avandia+drug+
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