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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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Mechanical jamming problem with CD shuffle carrier mechanism
Am wrestling with a 5 CD shuffle mechanism on a Panasonic SA CH 74
Does anyone know of a general resource for mechanical problems wth variants of these beasts ? This one has 5 separate platters to hold each CD. On entry the CD sldes along the bottom ,is elevated by the laser + spinner assembly and 4 flimsy 'ratchet' pawls hold the carrier in the elevated position and the main slide mchanism returns the carrier to the top of the stack of 5 after playing. Anyway something ,undiagnosed ,causes the top level transfer to stick part across ,cannot see what , with all the mechanism in active position. As a fall-back ,disabling the pawls and associated high level slideway the carrier will move in and out at low level for single CD operation without jams. Unfortunately a flimsey microswitch monitors carrier across the top and i won't know what effect non-switching of this micro will have until i rerassemble it all. Marvelous array of mechanisms all coming off the one motor drive or it would be if it worked. What sort of mind designs these mechanisms, rotary,rack and pinion, latches, slideways,reciprocating motions e-mail (removing .....) electronic hints and repair briefs , schematics/manuals list on http://homepages.tcp.co.uk/~diverse Nigel,Diverse Devices,Southampton,England |
#2
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Mechanical jamming problem with CD shuffle carrier mechanism
Marvelous array of mechanisms all coming off the one motor drive or it would be if it worked. What sort of mind designs these mechanisms, rotary,rack and pinion, latches, slideways,reciprocating motions e-mail (removing .....) electronic hints and repair briefs , schematics/manuals list on http://homepages.tcp.co.uk/~diverse Nigel,Diverse Devices,Southampton,England twenty years ago i accidentally came across a series of books in a library,stuffed full of weird and wonderful mechanisms. Should anyone have an interest in this sort of area including repair of automota etc I just went back to the on-line catalogue of the same library and it is still on their shelves. Ingenious Mechanisms for Designers and Inventors Volume I: Franklin D. Jones; 1930, 536 pp, illustrated, ISBN 0-8311-1029-5 more detailed info found on http://www.normas.com/INDLPR/pages/10848.html Each of the four volumes of Ingenious Mechanisms is an independent treatise on the subject of mechanisms. The books are similar in size and general character, but the contents are different. The mechanisms described are grouped into chapters according to general types. Together with the complete index, this arrangement by function makes it easy to find the class of movement desired, and enables you to compare mechanisms which are similar in purpose but different in design. The descriptions and illustrations are confined to the important and fundamental elements, so that time is not wasted reading a lot of useless or irrelevant detail. You are told plainly and briefly what each mechanism consists of, how it operates, and the features which make it of special interest. The particular mechanisms have been selected because they have stood the test of actual practice. Among the mechanisms described and illustrated by working diagrams a cam applications and special cam designs; intermittent motions from gears and cams; interlocking devices; valve diagrams; reversing mechanisms of special design; tripping or stop mechanisms; drives of crank type for reciprocating driven members; feeding mechanisms and auxiliary devices; feeding and ejecting mechanisms; and many, many more. Features: .. Gives inventors and designers concise, illustrated descriptions of many of the most ingenious mechanical movements ever designed. .. Presents specific ingenious mechanisms that have stood the test of actual practice. .. Each volume represents an independent treatise, making it self-contained. .. Fully describes and illustrates with working diagrams cam applications and special cam designs, interlocking devices, valve diagrams, tripping or stop mechanisms, feeding and ejecting mechanisms for power presses, and more. |
#3
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Mechanical jamming problem with CD shuffle carrier mechanism
"Nigel Cook" wrote in message ... Am wrestling with a 5 CD shuffle mechanism on a Panasonic SA CH 74 Does anyone know of a general resource for mechanical problems wth variants of these beasts ? This one has 5 separate platters to hold each CD. On entry the CD sldes along the bottom ,is elevated by the laser + spinner assembly and 4 flimsy 'ratchet' pawls hold the carrier in the elevated position and the main slide mchanism returns the carrier to the top of the stack of 5 after playing. Anyway something ,undiagnosed ,causes the top level transfer to stick part across ,cannot see what , with all the mechanism in active position. As a fall-back ,disabling the pawls and associated high level slideway the carrier will move in and out at low level for single CD operation without jams. Unfortunately a flimsey microswitch monitors carrier across the top and i won't know what effect non-switching of this micro will have until i rerassemble it all. Marvelous array of mechanisms all coming off the one motor drive or it would be if it worked. What sort of mind designs these mechanisms, rotary,rack and pinion, latches, slideways,reciprocating motions e-mail (removing .....) electronic hints and repair briefs , schematics/manuals list on http://homepages.tcp.co.uk/~diverse Nigel,Diverse Devices,Southampton,England For the archives - problem solved. Why will owners not admit they wrenched things to retrieve CDs and tapes. They must think we will penalise them in repair charge for there ignorance ,wheras in fact honesty should help us zero in on the problem quicker. We've seen it all before but sometimes like this case it is not immediately obvious. Retrieved a diplaced torsion spring from elesewhere in the casing. This biased a latch that engaged / disengaged at the point where CD platter sliding along base changes to vertical movement o f the laser + spinner and carrier. It looks as though a physically large but not strong torsion spring ,now missing, used to be at the centre of a long lever and quadrant cog that drives a lead screw to push a lifter of all the stacked CDs. Could not make sense of this spring as to function properly seems to be the reverse action to what the anchor hooks would suggest. Finally under the front edge of the CD carrier slideway is a little passive latch that holds/releases the bottom-most carrier relative to the slideway. This ,not obviously as covered,was out of alignment because the central plastic pin was broken- replaced with glued in nylon bolt after drilling a hole. |
#4
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Mechanical jamming problem with CD shuffle carrier mechanism
hi
i have the same problem, with mine, is their any way to fix this i don't know much about it but im sure if you gave me some instructions i would be able to play and fix it. "Nigel Cook" wrote in message ... "Nigel Cook" wrote in message ... Am wrestling with a 5 CD shuffle mechanism on a Panasonic SA CH 74 Does anyone know of a general resource for mechanical problems wth variants of these beasts ? This one has 5 separate platters to hold each CD. On entry the CD sldes along the bottom ,is elevated by the laser + spinner assembly and 4 flimsy 'ratchet' pawls hold the carrier in the elevated position and the main slide mchanism returns the carrier to the top of the stack of 5 after playing. Anyway something ,undiagnosed ,causes the top level transfer to stick part across ,cannot see what , with all the mechanism in active position. As a fall-back ,disabling the pawls and associated high level slideway the carrier will move in and out at low level for single CD operation without jams. Unfortunately a flimsey microswitch monitors carrier across the top and i won't know what effect non-switching of this micro will have until i rerassemble it all. Marvelous array of mechanisms all coming off the one motor drive or it would be if it worked. What sort of mind designs these mechanisms, rotary,rack and pinion, latches, slideways,reciprocating motions e-mail (removing .....) electronic hints and repair briefs , schematics/manuals list on http://homepages.tcp.co.uk/~diverse Nigel,Diverse Devices,Southampton,England For the archives - problem solved. Why will owners not admit they wrenched things to retrieve CDs and tapes. They must think we will penalise them in repair charge for there ignorance ,wheras in fact honesty should help us zero in on the problem quicker. We've seen it all before but sometimes like this case it is not immediately obvious. Retrieved a diplaced torsion spring from elesewhere in the casing. This biased a latch that engaged / disengaged at the point where CD platter sliding along base changes to vertical movement o f the laser + spinner and carrier. It looks as though a physically large but not strong torsion spring ,now missing, used to be at the centre of a long lever and quadrant cog that drives a lead screw to push a lifter of all the stacked CDs. Could not make sense of this spring as to function properly seems to be the reverse action to what the anchor hooks would suggest. Finally under the front edge of the CD carrier slideway is a little passive latch that holds/releases the bottom-most carrier relative to the slideway. This ,not obviously as covered,was out of alignment because the central plastic pin was broken- replaced with glued in nylon bolt after drilling a hole. |
#5
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Mechanical jamming problem with CD shuffle carrier mechanism
"Brad" wrote in message ... hi i have the same problem, with mine, is their any way to fix this i don't know much about it but im sure if you gave me some instructions i would be able to play and fix it. This is how the write-up will appear on repair file when i next ftp to URL below Panasonic SA CH 74,compact hi-fi 1996 Broken mic plug stuck in socket,jammed CD mechanism Mark orientation of all removable ribbon cables before separating - foil type push and pull,wire type raise the surround before pulling on the cable. Pull front panel away from main body, 2 indirect connectors under the vol control. To get to mic socket ,remove 2 knobs ,remove display pannel then multi-switch pannel. Desolder socket ,drill small hole on underside and push remnant of plug back. This one has 5 separate platters to hold each CD. On entry the CD sldes along the bottom ,is elevated by the laser + spinner assembly and 4 flimsy 'ratchet' pawls hold the carrier in the elevated position and the main slide mchanism returns the carrier to the top of the stack of 5 after playing or along bottom to release/change through front. As a fall-back ,disabling the pawls and associated high level slideway the carrier will move in and out at low level for single CD operation without jams. Unfortunately a flimsey microswitch monitors carrier across the top and i won't know what effect non-switching of this micro will have until i rerassemble it all. Marvellous array of mechanisms all coming off the one motor drive . What sort of mind designs these mechanisms, rotary,rack and pinion, latches, compound slideways,translating and reciprocating motions? [ for anyone involved with this sort of thing or automata then this book may be interesting Ingenious Mechanisms for Designers and Inventors Volume I: Franklin D. Jones; 1930, 536 pp, illustrated, ISBN 0-8311-1029-5 ] Retrieved a displaced torsion spring from elesewhere in the casing. This biased a latch (at the rear) that engaged / disengaged at the point where CD carrier sliding along base changes to vertical movement of the laser + spinner and carrier. It looks as though a physically large but not strong torsion spring ,now missing, used to be at the centre of a long lever and quadrant cog that drives a lead screw to push a lifter of all the stacked CDs. Could not make sense of this spring, as to function properly ,seems to be the reverse action to what the anchor hooks would suggest. Finally under the front edge of the CD carrier slideway is a little passive latch that holds/releases the bottom-most carrier relative to the slideway. Fingernails pushed behind this cover and forced up and out will release it. This latch ,not obviously as covered,was out of alignment because the central plastic pin was broken- replaced with glued in nylon bolt after drilling a hole . Broken pedastal type of microswitch monitoring slideway limits. For these 2 uswitches with CD drawer out both are s/c, in between sw1 s/c and sw2 o/c. Drawer in both o/c. 2 uswitches monitoring laser carrier movement in play sw2 &sw3 s/c ,in between sw3 o/c,sw2 s/c at bottom position sw2 & sw3 o/c. Top slideway microswitch n/o Drawer motor 3 to 4 V for external powering or remove rubber band and turn large cogs by finger. On reassembly intermittently powered down showing error F61 or FG1 ,probably dodgy ribbon connections as remade all and ok after that. e-mail (removing .....) electronic hints and repair briefs , schematics/manuals list on http://homepages.tcp.co.uk/~diverse/repair.htm Nigel,Diverse Devices,Southampton,England |
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