Good afternoon and thanks for reading. Did some searching for this fault and didn't see a thread so I'm going to start a new one. I apologize in advance if it's been answered.
I have a Fluke 8000a with battery option. On startup, I got a flashing "1999" on the display. Decimal point moves when range is changed, but no difference in the display. So I broke out the manual and followed the troubleshooting procedures. When shorting out S4 to TP4, I finally got a change on the display. It jumped around and was erratic, but it was something different. So I changed out the analog IC and related resistors/caps/diodes with a NOS analog IC kit from fleabay. After replacing all components, the 1999 was still flashing on the display.
Discouraged, I let it run for a while while I consulted the manual, eevblog, and groups.io for any answers and didn't get anywhere. When I monitor the period output for 10 mS, it's all over the place. So is there some PLL that is wonky? Could I inject a 10 ms pulse somewhere to see if that brings it around?
This is just a "kicks and giggles" project. Probably already spent too much, but I'm just doing it for fun. I have plenty of bench and handhelds but I'd like to get this one running for the collection.
thanks!
Joe
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