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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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Carlsbro Keyboard 150 , 15 inch combo from 1985
TO220 devices marked 40871 and 40872 and also SM are presumable RCA40871 /2
, anyone happen to know what the TO3 devices are , presumably NPN and PNP, cold test seem ok. Usual Carlsbro, locked behind rivetted heatsink, otherwise prea looks like HH Marlin type amps |
#2
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Carlsbro Keyboard 150 , 15 inch combo from 1985
I should know the identity of the TO3 tomorrow , both NPN on rechecking.
Loose Collector bolts so I have to get to the other side to tighten. Not rivets , looked superficially like aluminium rivets . On Googling ,maybe cct similar to this admirable effort at unravelling to a schematic, the Stingray amp http://ax84.com/bbs/dm.php?thread=467875 |
#3
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Carlsbro Keyboard 150 , 15 inch combo from 1985
Even more like the Stingray. 2x MJ802 , 1 BC182 and 3xBC557 instead of 3x
bc212. Soft blown (not blacjened) ps fuses and mains fuse , then abandoned for 10 years, no recollection of original failure scenario and nothing found, cold so far , a likely culprit |
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