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1/ The "jig used for aligning the capstan is just a 1/2 inch wide metal strip with a right angle end which is long enough to sit on the ACE assembly bottom metal edge and against the capstan to indicate when it is at right angels to the ACE assembly so the tape is not being dragged high or low as it is drawn past the heads by the capstan roller.
Please check that the capstan roller is not faulty in the bearings or on its surface such that it applies uneven pressure to the tape being held against the capstan in play.
This does not affect rewind as the capstan roller is released but the capstan not being perpendicular will.
2/ You can use a good/prerecorded tape and observe the video waveform on a CRO (cathode ray oscilloscope) as per the service manual to align the tape path correctly and set the tracking centre point. The first step is to do the electrical alignment for the tracking and later if necessary a mechanical adjustment of the ACE assembly position.
Hola del sony betamax sl 8080 no bajan las teclas de play , revobinado ,avance.GRACIAS
Good evening David, sorry from now on I'll post in English, thanks for your answer unfortunately the player didn't work it has several problems, I'll get a super beta soon, and I'll ask you for help, thank you very much ;)
I was confused The Sony SL-F20 is the player
Toni, do you write in English?
In this chat the people write in English, you can use the google translator
The Sony SL-C20 is a player only
Noel, I like your answer but I don't have alignment tapes but I'll look
I have seen in the service manual parts needed for adjustment, called "Jigs"
The tape folding during Play and Rewind (including fast forward) are tape path and tape tension alignment issues.
Possible issues to be confirmed or ruled out on Sony models.
1/ The capstan MUST be parallel to the ACE head assembly. Sony have an alignment jig for that which basically sits in the gap of the ACE upper and lower surfaces to indicate if its parallel.
(you can cheat a bit using adjustments while its rewinding to get that right once the next steps have been checked.
2/ The flip up guides are angled by black plastic strips mounted to the top of the head so that the tape wraps diagonally around the video head slot correctly.
Check they are not causing an issue as the tape should have equal tension and be flat top and bottom in all play modes around the back tape guide before the drum.
3/ Tape back tension in play should be 35 gm. You need an alignment tape with a meter in it to check that.
Buenas noches a todos desde Espa˝a, antes de meterme en materia, queria pregunta algo, a llegado a mis manos un video beta sony SL-F20 pero en el listado de modelos de la web ese modelo no aparece el mas proximo es el SL-F25, es el mismo???? gracias a todos y un gran saludo ;)
noel all correct but in play + rew the tape bend by under in the zone between audio head and the capstan
I have now managed to remove the pinch roller from my Sanyo VTC-M machine. I was very tight and I was not able to do it manually, so I had to VERY carefully prise the plastic part up with a screwdriver. The roller has gone shiny and slightly concave. Does anyone know of a source for replacement pinch rollers? I contacted a company in Ireland who listed them on their web site, but they no longer have any in stock. Also an Australian eBay seller claimed to have some, but they never responded to my last message enquiring about the price.
How easy is it to remove the capstan from these machines to give this a proper clean? Looking at the underside of the deck it looks like the whole motor assembly and circuit board has to be removed.
You are right there - don't remove the upper drum unless you need to replace the heads.
Glad you fixed it. Must have been something holding the heads away from the chassis at some point.
noel, I only removed the drum electronic 1 from the drum and I put a drum electronic 2
I removed the drum again, I put again and now run correct
The problem is that the drum electronic 1 that perhaps has the hall effect sensor damage (I don't checked) but you told me that the drum is hard while the play led is enable, this is the reason
Other thing is how squeeze the 3 screws with a springs and washers under the drum
I squeezed to see the image correct but perhaps there is a method
And the up part of the drum I prefer DON'T REMOVE (2 screws with + hexagonal screw), this is only for change the heads
I am not sure if you have taken the upper drum off the video head assembly but if you have its possible that the upper drum is not aligned with the lower drum now. Spacers are used to set them in alignment which may get displaced when you disassemble them. the result of such an offset is that the heads protrude further at some points of the "drum slot" than at others. This shows up as uneven amplitude in the video head output as observed on an oscilloscope. Lower "wanted" signal versus noise = drop outs. Adjusting the guides cannot correct this issue. Moving your finger around the tape service as it is playing can pin point the location of the worst signal when they coincide on the playback screen.
Just a thought.
JHonBetaC20 I have the service manual of the Sony SL-F90 only in paper
I can make various photos and send you to email
I think that perhaps is the power supply or the display zone (bad welds)
Hello everyone, first I want to take the opportunity to introduce myself and thank this forum for any help to learn and be able to contribute on the repairs of these wonderful machines.
I have a Sony SL-F90 and the fault that it presents at the moment is that it turns on but the display remains completely illuminated, that is, as if it did not start correctly. None of the keypad works or picks up the tapes, the entire display simply stays lit.
Any place to start? Thank you
I understand that the hall effect works with a magnet piece in near or far repeated
How works the hall effect sensor of the drum if the magnet circle is always near?
Depends of the coils?
David, thank you, I appreciate very much your help (To Noel and any who reads too, of course). I don't need F60 , F30 as well as F60 looks completelly different. The part I'm interested would be these related to the motors, maybe voltages sources and control, as I don't want to believe both have brokendown just at the same time. I am also interested in the audio recording section, as the recorded sound is very low and I want to try to improve raising the recording level. If you could scan it in a scan service shop, I gladly would pay its cost, if not possible, photos are ok. my email is [email protected]
Kevin, I changed the drum electronics and now run the drum
Now my problem is that the part up of the image appears as dropout
I move some guides but is the same
I thought that is the drum in incorrect position
I pulse the part right under of the drum and the image is correct
I removed the 3 screws with springs and washer under the drum and I put again but continue the problem
toni I have the service manual of the Sony SL-F90 only in paper
I haven't the service manual of Sony SL-F60 but is in pdf here cheap:
I can make photos of the SL-F90 service manual and send to your email, I haven't scanner
┐What parts do you need?
Noel, thank you. When I press play, all the functions are executed except the rotation of the two motors, the image of the TV changes (snow or black due to lack of synchronism/video), the motor that picks up the tape acts and goes to stop after 1 second, the only problem is that the two motors do not work. With the F60 I don't know, but with the F30 the electronics are very very very different. I have found a schematic of the F60 for $15 and on the same site the one for the F90 for $50, in the site manuals-in-pdf . com, so it looks confirming they are different. Thank you very much
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