SANYO BOOMBOX DEALER FROM THE 1970's PART 4 M-X920

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beverlyjean2

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Apr 3, 2011
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REPLACING THE BELTS ON THE M-X920 IS EASY IF YOU FOLLOW THESE INSTRUCTIONS. NOTE 1 IF THE COUNTER BELT IS OK, DO NOT REMOVE CHASSIS FROM CABINET. FIRST YOU MUST CLEAN ANY BELT RESIDUE FROM PULLEYS AND FLYWHEEL. DO NOT OVERLOOK THE LOWER FLYWHEEL GROOVE WHERE THE SQUARE BELT RIDES. TO REPLACE THE 2 BELTS, THEY MUST PASS THROUGH THE SPACE BETWEEN FLYWHEEL AND THE RETAINER PLATE. LOOK CLOSELY AT THE RETAINER. AT IT;S CENTER IS AN IVORY PLASTIC SETSCREW OF SORTS. GENTLY SCRAPE ANY GLUE FROM AROUND THIS SETSCREW. BEFORE REMOVING THE SETSCREW, GRASP THE FLYWHEEL AND GENTLY PULL AND PUSH IT. GET A FEEL OF HOW MUCH PLAY IT HAS. THIS WAY YOU WILL NOT OVER-TIGHTEN SET SCREW WHEN RE-INSTALLING IT. THIS SETSCREW ACTS AS A KIND OF BEARING AND IT;S REMOVAL WILL ALLOW YOU TO PASS THE NEW BELTS OVER THE FLYWHEEL. WHEN NEW BELTS ARE FITTED, REPLACE THE SETSCREW AND TIGHTEN UNTIL THE FLYWHEEL PLAY IS THE SAME AS IT WAS BEFORE..A NOTE ON TAPE COUNTERS. MOST BOOMBOXES HAVE A PASSIVE TAPE COUNTER DRIVEN BY A BELT ON THE TAKE UP REEL SPINDLE. IT HAS NO ELECTRICAL CONNECTIONS TO TAPE TRANSPORT. OTHER HIGH QUALITY BOOMBOXES HAVE AS PART OF THEIR AUTO STOP AND TAPE MANAGEMENT SYSTEMS,AN ELECTRICAL SENSOR THAT DETECTS THE TAKE UP REEL MOTION. IF THE COUNTER OR THE BELT DRIVING IT IS STICKING OR SLIPPING, THE TAPE TRANSPORT WILL THINK THAT TAPE IS SPILLING OR THE TAPE HAS ENDED AND STOP THE DECK. YOU CAN TELL IF YOUR UNIT HAS THIS TYPE OF COUNTER BY EXAMINING THE BACK OF THE COUNTER ASSY. MOST WILL HAVE A MAGNET THAT ROTATES AND A FEW WIRES FOR A SENSOR. THESE ACTIVE COUNTERS REQUIRE YOUR CLOSER ATTENTION TO COUNTER BELT CONDITION. IF IGNORED IT CAN RESULT IN RANDOM STOPPING OF TAPE DECK. I KNOW THAT TO MANY, THIS MAY BE OLD NEWS BUT IF WE CAN KEEP JUST CLASSIC BOX FROM BEING TURNED INTO A PARTS SET , IT;S WORTH IT.
 

Reli

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Dec 24, 2010
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Yeah I am wondering if that's why a couple of my fancy motorized decks won't play more than 1 second before stopping :hmmm:
 
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