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Re: deck A won't turn
The problem is the clicking spring of the pinch roller,that pushing through the spindle,maybe is weak or is not there,try to find out inside the deck,if you cannot find it.Improvised a clicking spring by means of the string of the guitar number 00,is good of making spring.
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You need to determine what is chewing the tape up. Most cassette doors clip off, this can often show the head and pinch rollers when they come into play. The pinch roller (the rubber one) is often the biggest cause of chewed tapes. But often it's the Take Up Reel that is not moving forward, so the tape is taken out of the cassette by the roller and spews out into the deck, getting tangled up in the roller. The roller itself can become worn and therefore doesn't make proper contact with the idler, or the idler (metal bar the roller pushes against) isn't turning caused by a belt that's broken.
The only way really is to observe what the tape is doing, but since this by definition means the tape could be chewed up, means you have to use an old tape that doesn't contain anything good on it. Make certain you can view as much of the workings of the deck mechanism as possible when using a test tape.
Since you don't mention the make or model number that is the best advise that any expert on here can give you.
Why do you want to change the Pinch Roller? Most of the time they just need a good cleaning and other things in the deck like back tension checked. Pinch Rollers are only changed if they are cracked and I have seen few cracked Pinch Roller in 40 years.
In the Teac X1000R this is most often caused by dirty Pinch Rollers and secondly bu a ring of oxide or a wear mark being developed into the capstan shaft. If cleaning the Pinch Rollers does not do it then a trip to the technician is required. These decks also have a touchy servo tension system that if upset can also contribute to the failure of this kind. I still work on these in Chicago area all the time. Russ the other ex-Teac guy is in New Jersey. Be careful of local shop with this model as many of them turn up the servo tension to resolve this problem which is the wrong thing to do that then burns out parts and the cost goes up. I have seen this mess many times as people bring me these decks as a last stop-- of course I fix then correctly with the use of the Tentelometer as is required. Pinch Rollers are often reconditioned with Naphtha after cleaning then with Denatured alcohol. Teac Tascam Repairs Skywave Tape Deck Repair Bensenville IL
First, push the Pitch control in so that it is turned off. Then if that is not it the deck need a servicing. Also make sure the Pinch roller is making good contact top the capstan shaft- if not the tape will slide through.
The very first mistake is to pry a door open. That damages them. You are never to do that. The correct way to get a tape out is to open the unit up and find out why the tape is stuck and then take action to release the door in the normal way- usually it is a loose belt or defective cam motor. As to the Pinch roller there are slide plates and even some pinch rollers had lubrication on them so that may have dried leaving you with a stuck part. The normal order of business is the find out what is stuck and then take action to clean and lubricate the mechanism to return to normal function. The problem with some Pinch Rollers is that there may be a particular spot it needs to be set at. This is true if it has a guide fitted to it. Then you will need either a jig or mirror tape to be able to set it correct again. I can not give any further advice without seeing the unit but this should get you started.
Hi Gary, This makes me think the Capstan Shaft is not turning either due to a broken or stretched belt or that the capstan motor itself has stopped working. This may be a job for a Technician. You first determine if the Capstan is turning or not- this is the metal post that contacts the Pinch Roller that rotates and is the way the deck gets it's speed regulation. If it is not turning look inside the deck from the side to see if the flywheel is turning and that the belt is on that flywheel. Lastly make sure the capstan motor is turning. Beyond that a Tech may have to take over from there. I am in the Chicago area and can repair it if you are close. Many people send me units from all over the USA anyway. My name is Sam. I operate Skywave Tape Deck Repair firstname.lastname@example.org if you need my help.
This condition, regardless of which way the tape is moving, is caused by the failure of a rubber pinch-roller to trap the tape between capstan and the passive roller.The speed is then caused by the part of the drive driven by a small belt and a clutch that should only keep a small amount of tension on the tape in ensure clean rewinding of the tape after it has passed the head. Lubricant in part of the transport's moving parts or a dried-out rubber roller may be causing this.If you want to try to clean the pinch roller, don't use alcohol since this can further harden the robber.Use a clean fiber-free cloth or paper towel wetted with a LITTLE naphtha and turn the roller on the wetted area. If you get some dark smudging, the treatment is working.
You need to locate the supplier of pinch rollers that will fit your tape deck. If that fails, you have a useless piece of gear. If the unit is of decent quality, you should be able to locate a supplier. You didn't include the make or model, so good luck.
Sounds to me like your Sony has a common problem among vintage reel tape decks..dried /frozen grease/ and or a lack of lubrication. carefully apply a tiny bit of fine lube oil, like 3in1, on the swing mechanism that carries the pinch roller...(you may have to remove the front metal deck face to fully access the swinging pinch roller mechanism) ) . do NOT get any oil on the rubber pinch roller..(best to make sure after by scrubbing the pinch roller surface with a cotton swab lightly dipped in non chemical household cleaner, like 409, or awesome orange i get at the dollar store. Then use the dry end of the swab to ensure the pinch roller is dry. .The pressure pads should swing upward and press the tape against the heads when in play/record mode..if they do not swing up, they are binding/ or out of adjustment....they are spring loaded so when the reel deck is in the stop position the spring loaded pressure pads are held down...play/record mode releases them to freely swing up and press on the tape against the heads.