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HP-41CX Missing Clock
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10-25-2020, 06:37 PM
Post: #3
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RE: HP-41CX Missing Clock
Thanks for the input, Monte. The resistor has drifted up from 22M to 27M, so I am going to replace that. I did find a reference to a 32.768KHz crystal in the 00041-90472 Service Manual, so that assumption was good. I scoped the oscillator circuit and it is not running. I am hoping replacing either the resistor or crystal will be the thing. Past that, it looks like replacing the timer IC 1LF6-0001 is next.
-Pat (KG5YPQ) |
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| Messages In This Thread |
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HP-41CX Missing Clock - rocket.scientist - 10-24-2020, 10:25 PM
RE: HP-41CX Missing Clock - Monte Dalrymple - 10-25-2020, 05:23 AM
RE: HP-41CX Missing Clock - rocket.scientist - 10-25-2020 06:37 PM
RE: HP-41CX Missing Clock - rocket.scientist - 10-26-2020, 10:06 PM
RE: HP-41CX Missing Clock - cruff - 10-26-2020, 10:54 PM
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