HP Forum Archive 10

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HP75D doesn't work with power adaptor Message #1 Posted by Lucien Gisclong on 4 Feb 2003, 11:05 a.m. Hi, I have a problem with my HP75D : It works fine with batteries but doesn't work with the power adaptor and doesn't charge the batteries. I need the schematics because there is 11 volts dc after the rectifier bridge and nothing after the regulating transistors without battery and vbattery with. Does somebody have an idea? I will be happy to receive this schematics. Best regards Lucien

Re: HP75D doesn't work with power adaptor Message #2 Posted by David Smith on 4 Feb 2003, 11:34 a.m., in response to message #1 by Lucien Gisclong Did you check the power adapter? Quite often the plug devlopes an open circuit. Connect a voltmeter and wiggle the wires around where they connect to the plug (machine end usually, somtimes at the wall wart)

Re: HP75D doesn't work with power adaptor Message #3 Posted by Lucien Gisclong on 4 Feb 2003, 11:52 a.m., in response to message #2 by David Smith Dear David, Thank you for your answer. I did tested the ac voltage delivered inside the HP75, not only at the adaptor. this voltage is unfortunately ok (i would prefer to have this kind of failure). Cheers, Lucien

Re: HP75D doesn't work with power adaptor Message #4 Posted by Emmanuel, France on 5 Feb 2003, 2:52 p.m., in response to message #3 by Lucien Gisclong Dear Lucien, I finally found my HP-75C Service Manual. I'm scanning electrical plans. Don't worry, be happy! Regards. Yours. Emmanuel

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