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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Sony DTC 690, DAT, reel motor problem
The right voltage to this motor but it is lacking torque. Turning the "torque control" pot to maximum (upping volttage )improves things but not a cure. On retraction of the tape into the cassete, the motor is sluggish to respond so the sliding guides are retracting before the tape is tensioned leaving a loop of loose tape for a short while before total retraction,so not a brake problem.. FF and REW are erratic/sluggish. Anyone know ,been here before, if it is likely a bearing problem. Voltage and current seem correct to the motor and it always starts, eventually, so not a shorted bit of rotor coils e-mail (removing .....) electronic hints and repair briefs , schematics/manuals list on http://homepages.tcp.co.uk/~diverse Nigel,Diverse Devices,Southampton,England |
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Sony DTC 690, DAT, reel motor problem
In article , "Nigel Cook"
wrote: The right voltage to this motor but it is lacking torque... Sony has had this problem with reel motors in many of their machines, including DATs and camcorders. The only fix I know of is a new motor. I think the permanent magnets get somewhat demagnetized over time, but anyone can feel free to correct me on that. By the way, I once owned a DTC-690, and I wouldn't recommend putting much money into one. They are very poorly made and have a lot of problems, especially tape transport problems. They sound good when they work, though. There was an update kit that fixed some of the transport problems, so maybe yours has it installed, in which case it might work OK. I hated mine, though. |
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Sony DTC 690, DAT, reel motor problem
"Michael" wrote in message ... In article , "Nigel Cook" wrote: The right voltage to this motor but it is lacking torque... Sony has had this problem with reel motors in many of their machines, including DATs and camcorders. The only fix I know of is a new motor. I think the permanent magnets get somewhat demagnetized over time, but anyone can feel free to correct me on that. By the way, I once owned a DTC-690, and I wouldn't recommend putting much money into one. They are very poorly made and have a lot of problems, especially tape transport problems. They sound good when they work, though. There was an update kit that fixed some of the transport problems, so maybe yours has it installed, in which case it might work OK. I hated mine, though. Many thanks for the input. I could only think of the bearing problem often seen on capatan spindles where there is just too much play and at certain speeds brakes itself. I never thought of loss of magnetisation. I agree about the mechanics ,while in there , i made a filler piece to retract the take-up side sliding guide fully up against its tape-retracted position. |
#4
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Sony DTC 690, DAT, reel motor problem
"Michael" wrote in message ... In article , "Nigel Cook" wrote: The right voltage to this motor but it is lacking torque... Sony has had this problem with reel motors in many of their machines, including DATs and camcorders. The only fix I know of is a new motor. I think the permanent magnets get somewhat demagnetized over time, but anyone can feel free to correct me on that. By the way, I once owned a DTC-690, and I wouldn't recommend putting much money into one. They are very poorly made and have a lot of problems, especially tape transport problems. They sound good when they work, though. There was an update kit that fixed some of the transport problems, so maybe yours has it installed, in which case it might work OK. I hated mine, though. Many thanks for the input. I could only think of the bearing problem often seen on capatan spindles where there is just too much play and at certain speeds brakes itself. I never thought of loss of magnetisation. I agree about the mechanics ,while in there , i made a filler piece to retract the take-up side sliding guide fully up against its tape-retracted position. |
#5
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Sony DTC 690, DAT, reel motor problem
In article , "Nigel Cook"
wrote: The right voltage to this motor but it is lacking torque... Sony has had this problem with reel motors in many of their machines, including DATs and camcorders. The only fix I know of is a new motor. I think the permanent magnets get somewhat demagnetized over time, but anyone can feel free to correct me on that. By the way, I once owned a DTC-690, and I wouldn't recommend putting much money into one. They are very poorly made and have a lot of problems, especially tape transport problems. They sound good when they work, though. There was an update kit that fixed some of the transport problems, so maybe yours has it installed, in which case it might work OK. I hated mine, though. |
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