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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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CD player drawer malfunction
The drawer loading belt on my machine is badly worn. The motor continues to
run when the drawer is fully open. I cannot identify any type of 'drawer open' limit switch. There is however what appears to be a mechanical stop with a copper tab that contacts the drawer in the fully open position. There are no wires connected to this tab. I have identified the 'drawer closed' limit switch, and it is functioning properly. I thought that the 'drawer open' state might be detected by over-current to the motor, but momententarily stalling the motor does not switch it off. This is a 20 year old machine (NAD 5255) with the old style drawer comprising the entire drive and laser assemblies. Any help would be appreciated. |
#2
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In article ,
"jack morantz" wrote: The drawer loading belt on my machine is badly worn. The motor continues to run when the drawer is fully open. I cannot identify any type of 'drawer open' limit switch. There is however what appears to be a mechanical stop with a copper tab that contacts the drawer in the fully open position. There are no wires connected to this tab. I have identified the 'drawer closed' limit switch, and it is functioning properly. I thought that the 'drawer open' state might be detected by over-current to the motor, but momententarily stalling the motor does not switch it off. This is a 20 year old machine (NAD 5255) with the old style drawer comprising the entire drive and laser assemblies. Any help would be appreciated. Maybe it just runs for a specific time and then shuts off? Remove the belt and then press the "open" button and see what happens. Isaac |
#3
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Jack,
There appears to be a pair of leaf switches on the rear right side of the mechanism, and one of these is called the limit switch on the diagram. The other is called the close switch. The NAD part number for the belt is 25755599 in case you want to contact Lenbrook Industries (www.nadelectronics.com) about getting one. Regards, Tim Schwartz Bristol Electronics jack morantz wrote: The drawer loading belt on my machine is badly worn. The motor continues to run when the drawer is fully open. I cannot identify any type of 'drawer open' limit switch. There is however what appears to be a mechanical stop with a copper tab that contacts the drawer in the fully open position. There are no wires connected to this tab. I have identified the 'drawer closed' limit switch, and it is functioning properly. I thought that the 'drawer open' state might be detected by over-current to the motor, but momententarily stalling the motor does not switch it off. This is a 20 year old machine (NAD 5255) with the old style drawer comprising the entire drive and laser assemblies. Any help would be appreciated. |
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