Got a Marantz SD4000 3 head deck I have just recapped...All went good except 1 channel will not record on the tape...Meters SHOW a signal being recorded but when played back,,nothing...Play back works excellent on tapes I have recorded and other tapes...Meters work as they should...Checked all caps again and wires going to head(s).All good..recording level knob to adjust meters during recording will adjust the meters during recording to set level..Heads were cleaned w/91% alcohol and demaged.. Went back and traced EVERY WIRE and none loose...Also cleaned new solded caps with alchol.. It recorded B4 I recapped. I am stumped...Any wisdom,experience and solutions would be greatly appreciated...