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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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Battery monitor IC
I repaired a guitat tuner today - blown 78L05 as
no supply reversal protection. I was intrigued by another 3 pin TO92 device marked 8054 HN 3C31 Presumably working order - just wondered what it did. Probably 8054HN not 8054 datecode , by Seiko, activation voltage 3.8V to 4.2V, battery monitor. One line is connected to INVERSE READ of the 80C51 micro , I didn't trace any other lines. But what would it do presumably when 5V drops to 4V or so. Just kill the LED drives or shut down completely via some other undiscovered trace. Seems odd having this sophistication but no diode protection against battery or ext ps reversal, especially in a product destined for musos. electronic hints and repair briefs , schematics/manuals list on http://homepages.tcp.co.uk/~diverse |
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