Capstan motors of Teac X7 rotate only manually (very stiff)
Reel to Reel Teac X7 has dual capstan motors. Worked fine several months ago. After lack of use, the capstan motors would not move the tape on playback. After rotating them manually to test for gumminess now they rotate only when substantial torque is manually applied, not by their own power. They rotate together (drive belt still connected, maybe?). I tried a drop of oil, no help. The service manual gives no clue how to take the machine apart or what may be wrong. Is there a book or some source of information which can help? Can the motors be lubricated? Is that the problem? Or do the motors have to be replaced? Are they available? Should I take it to a repair facility?
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Re: Capstan motors of Teac X7 rotate only manually (very...
Allied electronics still has these small motors. They probably won't have the same part numbers though. You will need the printed information from the motor as well as accurate dimensions for an accurate comparison.
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The TEAC 3300 made in 1972 is an extremely versatile tape deck, designed for the beginner through simplicity of design, yet built to the high technical requirements demanded by the semi-professionals and experienced audio enthusiasts.
The unit will operate at 7.5 or 15 per second and is available in 2 or 4 track configuration.
The belt is changed by the removal of the entire motor plate and taking the old belt residue or pieces out. Replacing a belt from off E bay has resulted in not fixing the deck correctly- I have seen this many times as clients send me the unit for the real repair. The belts from off E bay are too large and do not grip the flywheels correctly. Marrs Communications is the place to get correct belts. Since these dual capstan units are touchy, the replacement of the belt is NOT the only thing that is needed. They need Lubrication, capstan shaft reconditioning. Reel motor sometimes need rebuilding and a few other things plus calibration. I just repaired one last month that worked well after I was done with it.
Tape wrapping on a capstan shaft is commonly due to a sticky pinch roller or capstan shaft but is also because the take-up reel table does not provide enough torque or tension to gather up the tape. The Teac MTT160 cassette is a test tool we use to determine what the deck is doing torque wise. Telex probably has something similar. I worked with a guy who worked at Telex in the tape business- He did not talk about them much but he did say they had a lot of belts in them. Maybe you are just dealing with a belt that needs to be replaced. Lubrication also tends to be needed at every rotation point as well. That would include reel tables. I hope this gives you some help as Telex repairmen are getting to be like Hens teeth.
The Capstan motor is just for the play speed regulation so it has nothing to do with the reel motors. You can have an open safety microswitch or maybe a bad relay. It is really hard to say without looking at the unit but I am sure it is repairable. Is the right dummy plug put in the back? This can stop all transport functions if it is out.
Without physically looking at the cassette deck myself, I cannot be 100% sure the tape is wrapped around the pinch roller and capstan. The capstan is the chrome rod which the rubber pinch roller pushes to regulate the speed of the tape moving across the head. However it is approximately a 90% chance the take up reel for the tape stopped working from a bad tape or a loose belt which drives the tape take up reel. The clicking sounds like it could be the auto reverse solenoid because it thinks the tape has reached the end of play. The fun part is to remove the tape which you may have to disassemble the front panel if you cannot gain access to the tape from the top or bottom. You will need to cut the tape and remove it from the capstan and pinch roller to open the cassette door. Sometimes you can remove the capstan to free the tape. Once you have cleaned all the tape out of the unit make sure the belt for the take-up is good. If it is glazed, cracked, loose or broken order a belt. Clean all the pulleys and capstan and replace the belt. Your unit should be functional after the above procedure.
I just worked on one of those the other day. The unit needs other maintenance besides the belt- Flywheels need to removed and oiled and capstan shafts inspected and cleaned- I don't know how many ask me how to put in belts and then the unit end up at my shop because there are a lot other factors involved in the service of this deck. The last X7 I worked on needed both motors reconditioned but it worked great after that. Skywave Tape Deck Repair in Chicago if you need the job done right. I have the belts here and Russ is in New Jersey if you are out that way.
This is a case of a failing reel motor. What happens i sthe brushes become aged and wear down and the motor has what they call a dead spot on the Commutator. The motor will work fine at high speeds as the inertia is working for it but when you use a slow speed as in play mode the motor hits the dead spot and stops. You will need a new reel motor in the most likely case- I can service the deck if you want at Skywave Tape Deck Repair Chicago area. I will most likely put a new motor into the deck.
Without actually seeing your Teac reel deck, i suggest you verify that all fuzes in the deck are good..not blown. Also with a tape correctly installed..ensure that left and right tape tension arms are held under tension/ closed by tape tension, also ensure the capstan shaft is rotating... look in back to ensure the capstan drive motor is running.. if yes, and tape still will not play... problem could be a stuck/failed solenoid, dirty or corroded push buttons, or corrosion on contacts where rear circuit boards/plugs insert into other boards.