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Topic: Porst 100 Sound- not rewinding
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Andrew Woodcock
Film God
Posts: 7477
From: Manchester Uk
Registered: Aug 2012
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posted August 10, 2016 07:29 AM
it appears from your photograph then Urmas,that you have three identical microswitches in a row being activated by cam lobes from your mechanical rotary knob position (not in picture, so I am surmising here).
I just want you to be certain it is a faulty switch that is at fault and even then, that it is definitely the switch you have your thumb on in the photo.
The microswitches appear to bolt onto the steel bracket at top and bottom in a bank together. (Only you know this for certain as it is you who has dismantled it to get to this stage).
You need to establish when bolted firmly in the correct position, whether each switch is first, making a tiny clicking sound as the contacts are closed by the cam lobes, one at a time, for each switch position. Then secondly, if all is ok with the above, whether or not the actual circuit from the switch is being closed as should be the case to enable current to flow correctly through each of the 3 circuits.
For this you really need to be able to test each switch.
Sometimes, it may not be the actual switch, more a case of poor contact from the cam to the switch button or lever.
All of this needs to be established before you can make a further decision really, otherwise you may just be wasting your money at this stage.
-------------------- "C'mon Baggy..Get with the beat"
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Urmas Jaagusoo
Junior
Posts: 20
From: Tartu, Tartumaa, Estonia
Registered: Jan 2015
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posted August 10, 2016 07:49 AM
Actually I suspect that the fawlty one is the one which is in the middle i.e. not under my thumb but right in the middle of the photo. When I turned the knob and looked at the switches, then the front one worked ok and that one makes the film wind forward. But when I turned the knob to the rewind position, then the little metal part moved against the switch but the motor did not start. I assumed the problem must be the switch. I also tried to push the switch with a srewdriver to be sure, that the little metal part is not somehow too far (so it doesn't reach the switch). But that did not change anything. But it is good advice to be absolutely sure, and the only way I suppose is to use a multimeter, as you suggested. That will be a tough job for me though because I have never used one and to be honest I am not quite aware of the basics how the multimeter works.But I cannot give up thanks! My next job is finding out whether the switch I suspect does not do its job, works or not.If someone could give me a hint how can I run the test with a multimeter, it would be great! I load some more photos when I reach home.
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