Question about Philips Magnavox MWR20V6 DVD Recorder/VCR
I install a vcr tape it loads and runs about 10-15 sec, shuts down ..Whken I turn power back on the cassett ejects
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
The problem is the reel sensor or associated cricuitry. I am an electronic tech and could not figure out what was wrong. I replaced sensor and sensor emitter with no change. It was not the micro. I finally gave up and told the customer I could not repair unit. No schematic or parts available from Philips/Magnavox
Posted on Jul 15, 2008
Ok solution 2 was great except he went all around the problem but this is the fix for the problem! ! ! Go out to the Dollar store and buy a universial remote with a clear LED showing at the frount end. Break open the remote and desoder the LED diode note the arrow (if on the curcit board) should be pointing to the larger peace of metal in the plastic. Now the hard part 3 screws remove cover, aprox 14 remove back, unclip the frount. Be cairfull of the flat cable remove if you are ok with that. Remove 4 screws from DVD unit remove cables 2 recomended. Remove a bunch of screws from Circurit board. No need to remove Cassett ***. from Ck board. Remove Ck board. Now remove one screw from plastic light guide near center of cassett deck. See down in the hole it came from there is an LED (infra Red) like the one you took out of the remote. Find it on the other side and desoder it(get soder wick or special desoder tool) If you can get hemostats great or tweesers pull the old and install the new one. Make sure you do it like the arrow points printed on the bottom of the Ck board.
Ed Pearson firstname.lastname@example.org
Posted on Mar 11, 2010
This may sound very funny, but. I held the unit about 2 feet off the ground, then dropped it to the floor so it would land flat on the bottom. It now works just fine.....??????
I don't no what to say except it was toast anyway so what the hell thought i would see what happened. Now it works fine.
Posted on Dec 29, 2008
I have a philips/Magnavox VRA431T23 and has simliar problems
power turns on for 7 sec and shuts off and with tape does the same thing and ejects the tape and shuts off with an error message #3. I took off the cover and notice there is a sensor
in the middle pointing straight up. there is a clear plastic
reflector that is above it has been broken.try to replace it if possible.
Hope This Helps....
Posted on Feb 17, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
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This can be due to many faults and need a full check up but I can fill up with few tips.
1. If the cassette loads and the take up spool does not turn then the machine will shut and rewind.
2. If the take up spool rotates but then it shuts down then the reel sensor at the bottom of the forward wheel can be faulty- there are opto devices or proximity sensors/magnetic type.
3. If the drum does not rotate it will shut down as well a fault in the SERVO section.
4. Defective HALL IC can shut the switching and so the servo will shut down the processor.
5. Fault in the power section to deliver the correct voltage to the circuits/loading servo to take up.
6. Finally if the loading is not to the MODE switch point or failure of mode can make the loading to trip as it will not complete the load to the desired point.
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