Gefunden für alcohol test mesgert - Zum Elektronik Forum |
| 1 - Noisy picture -- Videorecorder Grundig 2280 a | |||
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| 2 - Help with two Grundig 2x4: drilling sound, machine aborts after starting playing -- Help with two Grundig 2x4: drilling sound, machine aborts after starting playing | |||
| Update! Update!
Last night I finally was able to make the "rubber tongue" test! It's the 3rd day on this week I only sleep 4 hours and I'm about to collapse, but here are the results  :
I took off the piece of plastic, from my "newer" 2x4, that is on top of the head drum. I cut a little piece of rubber I had at home with a similar shape to the one broken the day before... removed the remains of the same piece on the drum of the "older" machine (some leftovers went inside the head drum when removing it :77:, that was unavoidable since the little plastic that was left in its hole almost disintegrated when trying to remove it!). Put the piece on its place and "sandwiched" the new "tongue" to the border of the drum... Pressed play... And at the 1st play the mechanism made its full route, the drum rotating and it went continuosly, without any stop nor F, until I stopped it. That 1st time was without a tape. 2nd one was with one... same behaviour, the mechanism was working good, wonderful sound, everything smooth, no tape jams... Unfortunately, I have to say this is a partial success. When I turned on the TV... Well... | |||
3 - Interfunk/Grundig/Siemens VCR 2000 - White spots, snow / Accepts tape but won't play -- Interfunk/Grundig/Siemens VCR 2000 - White spots, snow / Accepts tape but won't play | |||
| Hi again!
It's been a long time without updates. Lack of spare time... Yesterday finally I tried the motor commutator cleaning method that Stego recommended. I was vey worried that I would break it. When I removed the bottom cover, taking of a couple the couple of screwas that keep a "plate" attached to it, I noticed those had been already manipulated! They had a cover of orange paint to "seal" them that was broken, and the wheren't being kept "joined", so I'm almost sure someone has alreade been keepeing thir hand on there! Inside the motor there was the commutator. It was covered by a kind of dark, dirty, greasy, kind of solid paste. The "shoes" had "painted" their shapes over the commmutator, so there were left like concentrical circles of the "paste" and the pins of the shoes seemed to be in contact with the commutator itself. After cleaning it (this time I didn't used alcohol isopropyl but "circuit cleaned", not directly but applied with cotton stabs. I think that was ok. But I dubted about applying pure vaseline... I thought that MAYBE the black grease was conductive, graphite-based grease. Or if it wasn't, I supposed that an oily, non-conductive lubricant would avoi... |
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