Magnavox vcr model:VR9720AT01,year:July 20,1988,UL Listed:679F=Panasonic,FCC ID Code:ACJ927064.During playback of a recorded tape taken from same machine no audio but audio is present from pre-recorded tapes from other machines.Anyone have any common repair tips?.Thanks.

Sidney
Dartmouth,Nova Scotia
Canada

Sid. Your problem looks like the Bias OSC in the recording path. Probably the Tx is the problem. Looks like the manual is paper 5715/A/B. I will take a look and see if its in the file.

Don't bother Bob, Sidney isn't worth your trouble!

Let the man have his hobby!

Yeah but he always relies on us techs to fix his problem. Then he gets all the money and credit for fixing the stuff!

well let him alone. besides who else would even consider repairing vcr's, dvd's, etc, since that stuff is all throw away junk anyway!

I hope when you get a chance you can give me part #'s.Thanks.

Sidney
Dartmouth,Nova Scotia
Canada

I replaced all electrolytic capacitors in power supply,cleaned mode switch and vcr.Anyone have any common repair tips? these are other units which are the same or similar:

Panasonic models:PV-2800,PV-4800,PV4812
Quasar models:VH-5280,VH-5480
GE model:VG-7720

Thanks.

Sidney
Dartmouth,Nova Scotia
Canada

Sid. Your problem looks like the Bias OSC in the recording path
That is what Bob said and he is right!!
The problem is not in the power supply or mode switch!

I BELIVE BIAS OSCILATOR IS WORKING BECAUSE IT DID ERASE THE OLD AUDIO RECORDED ON TAPE. U NEED A 10MHZ (AT LEAST) OSCILOSCOPE FOR THIS AND START TRACING FROM THE RECORDING HEAD TO THE AUDIO SECTION WHILE ON RECORDING.
GOOD LUCK

If it deletes its in the record path and that is not worth trying to find. Now this is Canadian so its not for me but its from the pickup head (whether Stereo or not)through all the processing, to the record head. A good tech could spend hours tracking that with all the data, send this one home.

I would suggest that you take that unit to a repair shop that has been recommended to you by word of mouth by your friends,relatives,co-workers or neighbours as that is the proper way to find an honest and qualified tech,they may be an authorized shop for that brand or they may not,they may be a store front or home based but they would be qualified to fix it as stated by the many notices manufacturers place on the back of their equipment for customers to read and respect.

If you attempt to repair the item yourself you will definetely not fix it but instead create more problems,a risk of fire and personal injury and afterwards a lawyer will come to you and tell you "lets sue this tech for $XXX XXX as it won't cost you a nickle or a dime,you penny pincher,spend thrift,nickle & dimer,low baller,cheapskate,tightwad,freeloader,toe picker and hustler" and the lawyer would screw you just like a car mechanic and the only thing you would get out of it is a free jar of vaseline and a pillow.

Finally it takes years of formal training to acquire this knowledge usually by community college/vocational school (some by correspondense courses or the like) as well as training afterwards by manufacturers or from everyday personal experience working on stuff combined with expensive dedicated test equipment,service manuals and in some cases repair tips that we share through the internet.
In plain English:

take it to a repair shop as we have to make a living just like you" also if it was just cleaning,a loose wire,or a burnt fuse we would be rich.By way that tech that replies to customers on this site should stop even if it requires sacrificing his dominating authority and attention whoring.