Ewd2202 dvd/vcr combo when i put a vcr tape i can

the video heads are probably dirty.there is a steel drum 1/2 inch thick that you can see if you look thru the front lid where the tape loads.the video heads are little black spec looking things on the bottom of the drum.the easiest way to clean the drum for a novice is to put isopropyl alcohol on a piece of 2 inch square paper.hold the paper very lightly against the drum with your right index finger.turn the drum from the top,anti clockwise.you will see some black stuff on the paper.do the same with a piece of dry paper.otherwise the tape will stick to the drum if still wet.DO NOT use a q tip,as it will get caught in the heads and break them.
sometimes,just running a new blank tape for 15minutes will dislodge the particles and the picture will re appear.if you have recently rented a movie,and saw lines running across the screen,and noise from inside the machine,it is damaged tape going across the heads and drum and it can wipe out the picture just like that.run a blank tape first and then clean the drum if you have to.