Philips Magnavox DVD/VCR Dual Player "vhs plays 15 seconds" Questions

...VHS player plays for 15 seconds, stops, then the hold unit turns off. When the unit is turned back on, the tape ejects. VCR is set with blank tape..Bring up vcr control on TV with television set on ...

...vhs tape installed in it and will not play,eject or any other function.When a button is pushed screen reads NO TAPE.I have unplugged unit overnight and also held on/standby button for 10-15 seconds ...

plays DVDs and VHS tapes OK, but it just won't record. By the way, this is a replacement unit because the first one I bought didn't work on 8X or 16X discs. It only worked on 4 X. They sent this piece

...VHS and back to DVD.  It plays and records.  It must be that the lead solder on the ribbon plug-in connections gets oxidized and need to be cleaned.  Just pulling them out and pushing ...