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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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#1
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Renovating gang switches
Confronted with a huge Rotel amp from mid 1970s.
Function switch, interlinked S/R ganged switch, 5 gang, each of 4 pole 2 way with pins extending above and below and a pcb above and below . One failed switch contact. I'm surprised I've never had to break into one before, serious miultiway radio waveband switches , yes, but they are not ganged. This make of logo TMS in an elipse, hopefully applicable to other makes of ganged switches. How to get inside without desoldering all that lot. U channel steel between the 5 gangs has 4 nibs , bent over, to trap each gang , bend back those 4 and the next 4 along the gang strip to give some lee-way. Small blade between that channel and the sw body to lever and give enough gap to release the S/R interlink that runs inside the U channel , and in this one release a nylon limit widget , from under the spring and then the core of the gang simply slides out. In this case aged/compacted grease had wedged the phosphor-bronze contact away from ever making contact |
#2
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Renovating gang switches
"N_Cook" wrote in message ... Confronted with a huge Rotel amp from mid 1970s. Function switch, interlinked S/R ganged switch, 5 gang, each of 4 pole 2 way with pins extending above and below and a pcb above and below . One failed switch contact. I'm surprised I've never had to break into one before, serious miultiway radio waveband switches , yes, but they are not ganged. This make of logo TMS in an elipse, hopefully applicable to other makes of ganged switches. How to get inside without desoldering all that lot. U channel steel between the 5 gangs has 4 nibs , bent over, to trap each gang , bend back those 4 and the next 4 along the gang strip to give some lee-way. Small blade between that channel and the sw body to lever and give enough gap to release the S/R interlink that runs inside the U channel , and in this one release a nylon limit widget , from under the spring and then the core of the gang simply slides out. In this case aged/compacted grease had wedged the phosphor-bronze contact away from ever making contact Dem gang swichez is sick innit |
#3
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Renovating gang switches
On 3/6/2013 5:35 AM, N_Cook wrote:
Confronted with a huge Rotel amp from mid 1970s. Function switch, interlinked S/R ganged switch, 5 gang, each of 4 pole 2 way with pins extending above and below and a pcb above and below . One failed switch contact. I'm surprised I've never had to break into one before, serious miultiway radio waveband switches , yes, but they are not ganged. This make of logo TMS in an elipse, hopefully applicable to other makes of ganged switches. How to get inside without desoldering all that lot. U channel steel between the 5 gangs has 4 nibs , bent over, to trap each gang , bend back those 4 and the next 4 along the gang strip to give some lee-way. Small blade between that channel and the sw body to lever and give enough gap to release the S/R interlink that runs inside the U channel , and in this one release a nylon limit widget , from under the spring and then the core of the gang simply slides out. In this case aged/compacted grease had wedged the phosphor-bronze contact away from ever making contact Spray with DeOxyIt !! |
#4
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Renovating gang switches
I tried opening a more recent ALPS multi-gang switch, laying around, with
pins emerging top and bottom. Much the same routine to extract the core , no ball bearings or anything other than the contacts are likely to drop out. Easier to reassemble than those long radio waveband switches, laty the innermost pair of contacts in their wells, push in, then add the next pair and push in. |
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