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Re: slv-se820 vhs powers on but ?
This could be caused by noumerous things:
1. there may be all kinds of definitions that got messes up, such as a lock up of any kind. check manual, there should be a list of common faq's and solutions.
2. check for any blown fuses. check resistors.
3. regulator may have gone bad (not sure about that one).
4. there may be an incompatible level of voultage. if its too low it will not power on the system, if it is too high, the high-voultage mechanizm will cause it to shut down. measure the voultage in the system, if you dont know how to do it exactly: Remove both of the power transistors from the primary, then power
up the circuit with AC, then provide 5V (variable) to the secondary side, send it back in the way it normally comes out! Now measure accross the transisor side of the opto while varying the 5V above and below 5V (note: the transistor side of the opto is on the primary side of the power supply since it is feedback)
If the feedback circuits are working the opto should turn on and off as you vary the voltage above and below 5V.
there could be many more options im afraid, but I hope that will do. good luck.
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You can record a digital TV signal on a VHS VCR but only in analog format. The digital signal must be input to the VCR by some component which has a yellow composite video output and a white audio output such as a digital cable TV box or satellite receiver. For over-the-air digital TV, either the TV must output analog video or you need a DTV converter box connected to the VCR. Bottom line, the digital signal must be converted to analog for the VCR since VHS VCRs generally are analog recorders.
This is often a frustrating problem but if you feel you can handle it go ahead with the following, otherwise get professional electronics help. If you have tried to eject the tape and tried other obvious ways to extract the tape and nothing has worked then you can remove the top cover and manually remove the tape. It is not that hard to do most of the time. First unplug the power cord from the wall outlet. You do not want to get a short or get shocked or zapped. Just unscrew the screws holding the cover in place and set the cover aside. Look at the tape to see where it is hung up. If you need to push the tape around so you get it off the posts or otherwise free up the tape, then gently do so until you free the tape from the tape transport. Sometimes this is all you need to do to extract the tape. You may be able to push out the tape from the VCR at this point. If you can get all the magnetic video tape back into the cassette but the tape simply will not come out then place the cover back onto the VCR, plug the VCR into the wall outlet, power on and try to eject the tape now. Sometimes this works. If all else fails, take the VCR into a electronics repair shop and have them remove the tape for you. They may tell you the VCR needs repairs also so this does not happen again.
There can be different issues in the mechanism or electrical that will cause the unit to shut down. However, since the power is going off completely after the initial plug in I suspect the power supply.
The SMPS, Switch Mode Power Supply has filter components that age due to heat, the voltage output on the filters reduces until the Micro Processor malfunctions and the unit won't stay on. The power supply filters can be changed by an experienced technician for $10-$15.00 in parts plus labor.
Unplug the VCR. Take the cover off by taking out the small screws on the sides and on the back that hold the cover on. With the cover off you should be able to gently move the tape back out. Things could be damaged......after the tape is out, you should try it first with a tape that could possibly be damaged during testing and do not touch anything inside while plugged in to power during testing with the cover off! Now......if it is not a working VCR anymore......you are in luck. There are garage sales every weekend...and almost every one has a VCR for almost nothing....some like new.....and boxes and boxes of tapes/movies for very little money too.
I suspect the internal backup battery is faulty inside the machine. Sometimes it can be an actual battery soldered to the circuit board otherwise look for a low voltage high capaticance capacitor - for example 3.5v 10F. If you dont know how to check for these things then find a competant technician. Good luck.
Try cleaning the entire Tape path, as I suspect a dirty Control Head. Since it is not wise that you open the machine and do it yourself, buy a good quality 'Wet Type' Head Cleaning cassette, and use as per instructions.