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#1
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A-4010S Hissing and Alignment
I am working on this unit which had not operated in some 20 years
according to the previous owner. I changed the belt, oiled the motors, capstan, and pinch roller. Cleaned and demagnetized the heads. The right side reel holder had somehow managed to get out of alignment and I had to loosen the setscrews on it raise it to the level of the other reel. The unit now plays, but it might still have these issues: Hissing. I can hear hissing noise, as you do with a cassette deck when not using noise reduction, or perhaps a bit louder. Is this normal? The hissing persists for about 10 seconds after I turn the unit off. I am playing through a '70s vintage Pioneer, but that is not the cause. Are these units suppose to be this noisy? This is definitely not hifi. Tape tightness. The tape seems awfully tight to me, but I have never used one of these before. It takes up and rewinds okay. Alignment. I think the tape on the take up reel is showing a little crinkling, On the first tape guide before the head, the tape does not appear to be fully in the slot, rides a little. How can I make sure that tape alignment is right on? The head adjustment screws are dabbed with a marking compound and do not appear to have ever been tampered with. |
#2
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Problem with the 4010S is the pinch rollers get so hard, that the tape
sloughs off the roller while playing unless the tape tension is adjusted up pretty high. Cleaning the controls, cleaning AND DEMAGNETIZING the tape path may help with your hiss problems. If there's lots of hiss when the tape isn't moving, then there could be circuit problems. Bad transistors or capacitors can cause this, but normally only one channel would be affected, not both equally. Mark Z. "Rob" wrote in message om... I am working on this unit which had not operated in some 20 years according to the previous owner. I changed the belt, oiled the motors, capstan, and pinch roller. Cleaned and demagnetized the heads. The right side reel holder had somehow managed to get out of alignment and I had to loosen the setscrews on it raise it to the level of the other reel. The unit now plays, but it might still have these issues: Hissing. I can hear hissing noise, as you do with a cassette deck when not using noise reduction, or perhaps a bit louder. Is this normal? The hissing persists for about 10 seconds after I turn the unit off. I am playing through a '70s vintage Pioneer, but that is not the cause. Are these units suppose to be this noisy? This is definitely not hifi. Tape tightness. The tape seems awfully tight to me, but I have never used one of these before. It takes up and rewinds okay. Alignment. I think the tape on the take up reel is showing a little crinkling, On the first tape guide before the head, the tape does not appear to be fully in the slot, rides a little. How can I make sure that tape alignment is right on? The head adjustment screws are dabbed with a marking compound and do not appear to have ever been tampered with. |
#3
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In , on 10/31/04
at 03:57 PM, "Mark D. Zacharias" said: [ ... ] Tape tightness. The tape seems awfully tight to me, but I have never used one of these before. It takes up and rewinds okay. Alignment. I think the tape on the take up reel is showing a little crinkling, On the first tape guide before the head, the tape does not appear to be fully in the slot, rides a little. How can I make sure that tape alignment is right on? The head adjustment screws are dabbed with a marking compound and do not appear to have ever been tampered with. Before talking about alignment, cure the tape path problem. It seems like you have a tape travel and tensioning problem. "Travel" is the path taken by the tape as it moves through the machine. As mentioned elsewhere, make sure the pressure roller is in good shape. Check the tension on the supply ["back tension"](left) and take-up (right) reels. Brake drag or failed lubrication can cause higher than normal back tension. Make sure the tape path is clean. Also make sure your tape is in good shape. Some old reels of tape may become sticky. ----------------------------------------------------------- spam: wordgame:123(abc):14 9 20 5 2 9 18 4 at 22 15 9 3 5 14 5 20 dot 3 15 13 (Barry Mann) [sorry about the puzzle, spammers are ruining my mailbox] ----------------------------------------------------------- |