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Sony SLV-778 capstan pinch roller fell off

The Sony capstan pinch roller fell off my SLV-778 fell off my VCR How do I get it back on and retain it?

Thanks, Tom Dulin

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2 Suggested Answers

  • 187 Answers

SOURCE: the rubber roller fell off the pinch assembly sony slv 760 hf

On top of it there must be a white plastic cover to keep it in place.

Posted on Aug 04, 2009

mybradley7
  • 242 Answers

SOURCE: We have a Sony Betacam 2650 in which the tape

clean the heads. your betamax is eating your tape.

Posted on Jul 16, 2010

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My vcr has a shaking sensation during playback. I


Likely capstan motor and/or pinch roller worn. Probably more than new VCR.

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The rubber roller fell off the pinch assembly sony slv 760 hf


On top of it there must be a white plastic cover to keep it in place.

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VCR keeps ejecting the tape


It needs Belts/Idler/Pinch roller.. If you UNPLUG IT, remove the cover you can wind the tape back manually....When you can get a DVD player.

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If pictures are rolling during normal playback, just check one thing first. Open the Cassette flap and see the condition of the tape. Is it chewed and stretched at the bottom? If yes, the problem is a worn Capstan / Pinch roller in the VCR. It is cheweing up the lower edge of the tape, and therefore the VCR is not able to process the 'Control Track.
All you need to do is replace the Capstan / Pinch roller.It is a big (approximately 1 inch high by 1/2 inch wide Black Rubber roller inside the VCR. REPLACE. Problem will be solved.

Jul 18, 2008 | Panasonic PV-V4021 S-VHS VCR

1 Answer

Won't play or record.


This will be a bit difficult because I can't see the unit, but here are a few ideas.
1) Did the arms that pull the tape around the head go all the way around the heads? If not, I would look at the loading motor belt. It may be slipping and not fully loading the tape.
2) Is the tape being pressed up against the pinch roller on the right hand side of the deck? If not, there is a pivot arm that is supposed to pull the tape up to the pinch roller. This arm often gets stuck in the "loaded" position and therefore does not pull the tape up to the pinch roller.

Please update this with what you see and I'll provide more details on how to address the problem.
Dan

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2 Answers

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None that I could find. Trash time for this Sony

Dec 10, 2007 | Sony SLV-798HF VHS VCR

2 Answers

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Though not familiar with this model, VCRs of all sorts have an idler mechanism which drives the supply and takeup spindles. Either the idler is somehow defective and slipping, and, assuming this idler is belt driven, the belt may be slipping just enough to cause a no Rew/FFW condition. If you had access to a test tape jig (a clear dummy tape, which allows a tech to view what is happening in the area normally obscured by the loaded tape), this might give a clue as to what is happening. On alot of machines, a problem with Rew/FFW would also mean a tape takeup problem in standard play, result in tape spilling out inside the machine. Sensors would catch this condition and go into a error mode, as yours is doing. One other thing which might be happening here, is the pinch roller not being disengaged from the capstan in the Rew/FFW modes. I think this is where I'd look first, and you can probably see if such is happening just by pulling the cover off the VCR. The pinch roller is just to the right of the rotating video head. In the play and forward/rev search modes it will press the tape up against the capstan (a rotating shaft). When in Rew/FFW, the pinch roller should be pulled back from the capstan, maybe 1/4 inch or so. Whatever the case, repair will likely take someone tech savvy. Costs might not be economically justified, with the low-cost, disposable rigs sold in the last 10+ years.

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3 Answers

Tape won't load.


This is a problem with the process called 'tape loading' - pulling the tape loop out of the cassette and wrapping it around the spinning video drum, engaging the capstan and pinch roller and reel rotation. With the cover off, observe the behavior when you hit play. (You may need to put a piece of cardboard over the cassette to block external light from interfering with the start/end tape sensors). Assuming this is a basic VCR (no instant start features), you should see: 1. The video head drum begins to spin. 2. the roller guides move smoothly on the tracks, wind the tape around the drum, and stop snuggly pressed against the 'V-stopper' at the end of the tracks. 3. The pinch roller moves into position and presses the tape against the capstan. 4. The tape begins to move and is wound up by the takeup reel. 5. The picture and sound appear on the TV. With a 'rapid or quick start' (or it may be called something else) transport, the tape moves to a half-loaded position when the cassette is inserted. This is at an intermediate position partially pulled out of the cassette but not wrapped around the drum. On VCRs with a real-time counter and/or index search capabilities, the tape will be in contact with the control head. With an 'instant start' transport, the tape will fully load around the spinning drum when the cassette is inserted but the capstan will not engage and no tension will be applied to the tape until you press PLAY or REC. (After about 5 minutes, the drum will stop and it may unload to the half loaded or unloaded position.) Note that for VCRs with a real-time counter and/or index search capabilities, the tape must be in contact with the control head (but not the video heads) for all relevant modes. These VCRs (which include many modern units) must therefore pull the tape at least partly out of the cassette. In all cases, the completion of the sequence results in approximately the same mechanical configuration during PLAY. Several likely possibilities when it shuts down: 1. Everything occurs as above, picture and sound appear for a few seconds, but then the VCR unloads the tape, ejects the cassette, goes into REW mode, stops, or shuts off. Two common causes: The takeup reel does not turn and tape spills into the machine. This is sensed by the microcontroller which aborts record or play and attempts to save your valuable cassette. Most likely cause: old/dirty idler tire. As a test, turn the idler tire inside-out. The fresh surface will now work well enough to confirm this diagnosis and will continue working long enough for your replacement idler tire to arrive. See the section: "General guide to VCR cleaning and rubber parts replacement". The takeup reel is turning properly but one of the reel The takeup reel is turning properly but one of the reel rotation sensors or its electronics is defective. As a test, check to see if the tape counter is changing at any time during the loading and

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