The Museum of HP Calculators
HP Forum Archive 05
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Message #1 Posted by Andrew Hart on 26 Apr 2001, 6:08 p.m.
My HP71B appears to have a failed internal voltage regulator it shows sign of high heat and there is no output voltage. It appears to be a standard type TO220 style three pin voltage regulator. To replace it I need to know what the regulated supply output was. Does anyone have any idea of what is should be.
The chip (Motorola) is marked with the following 407M 4-0932 and elsewhere a date code.
For interests sake, the serial number of the unit is 2514A00662
Any help would be appreciated.
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