Question about Televison & Video
Posted by Anonymous on
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Posted on Jan 02, 2017
It sounds like the sensor to tell the microcontroller that the tape is moving is not working. If that is so, the VCR would probably do the same thing in FF or Rewind. If you end up taking this unit into a repair shop, have them check the DVD's software version (it should be 1.250) If below that number, have them upgrade that as well. You can check the version yourself by pressing 1,2,3,4 and then "display" on the remote while the unit is on and no disc in DVD. After noting the version, just hit "power" on the remote to exit this mode.
Posted on Jan 01, 2007
SOURCE: VHS has audio but no video
we cannot get the vcr portion to work only the dvd player works what are we doing wrong?
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Best Solution posted on Oct 24, 2007
Rating: 88%, 431 votes
On some of the DVD/VCR combo units, the VCR output is only available through the RF jack (channel 3), standard video (yellow) RCA jack and S-VIDEO jack. If you are using the Component jacks, the DVD side will work but the VCR will not. This is because the quality of video recorded on VHS tapes is so much lower than component quality video.
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Posted on Jan 01, 2008
My guess would be dirt on the rollers inside the VCR. They sesnse a jam and ejct. Try a VCR cleaner (with cleaning fluid) and see if that helps.
Posted on Feb 21, 2009
This is similar or identical to another post, but here is an answer...
Hi, I have a solution you can try.
I had exaclty the same problem. When I tried to play a tape it would load (However, I recall I had to push hard to get the tape to be accepted, which is part of the problem) but would shut off after about 12 seconds, then when I powered back up the tape would eject. Finally I took the unit completely apart and attempted to use it with the covers off. Lo and behold, I found I could play a DVD on the unit without the unit powering off, but only if the room lights were on! If I tried to play a tape it would shut down the unit. So that led me to diagnosing the infrared loading and reel sensor circuits.
Background on that is there is an infrared LED that shines up through a plastic light pipe lens. The light from that LED (you can't see it) should shine on two photodiodes that are on either side of the tap mechanism, plus down through a gear with holes in it on to the reel sensor. When there is no tape inserted the two photodiodes will be illuminated and have about 0.2 volts across them. When a tape is installed the light will be blocked and the voltage goes up to above 2.5 volts across the diodes. You have to check this with the room lights dim as the diodes will respond to that light. When you block the light on either side of the plastic light pipe with your finger (with the unit disassembled) you should see the load motor engage, and it will back off when you take your finder away. For some reason in my unit the light from the LED was insufficient to turn on one of the diodes, and also to pulse the reel sensor when the gear turned. That could be due to component aging, or even if the light pipe started to cloud due to age, I don't know. However I was able to get the thing working...
In short I got the unit working by adding 3 resistors.
To do this you'll have to remove all the covers and remove the main PCB from the bottom chassis, unplug the power supply from the PCB, and the two ribbons going to the DVD unit. But you won't have to take off the VCR assembly, which is a pain. You just need some basic soldering skills, and remember where all those screws go...
First, I adjusted the voltage across the right-hand side load sensor diode to get the diode to switch on and off. I recall that I added 1meg across the diode. So the voltage then went from about 0.5v up to 2.8v from light to dark condition.
Second, I increased the current to the IR LED. I added a 330ohm resistor across the feeder to the LED. I recall that was R511 and was originally 220ohms. That was not quite sufficient to get the reel sensor working reliably. I didn't want to stress the LED by putting too much more current through it so looked for another idea.
Third I added 56k across the reel sensor diode to bring the voltage across it down so it would switch on and off as the reel sensor gear turned.
I now have a tape playing continuously in the unit and it seems ok for the time being. Hope that might work for you too.
Posted on May 26, 2009
alot of times when the video cord gets pinched it will go to black and white you just have to replace it if that dont work. then its one of the machines.
Posted on Nov 12, 2009
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