I have three or four 9010A that won't boot (but they used to!) but I don't have time to fool with them right now. (As long as one still works!) On 10/22/2017 10:52 PM, Robert Robert via Techtoolslist wrote:

Thanks for the help is apreciated i figured it out there was 2 issues the u62 was bad and one ram chip was bad also and the fluke i used with z80 pod didnt pick up the error when it was doing the short ram test so i figured they were good i changed u62 and one ram chip and its booting now thanks for the help its apreciated

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Yes, I helped Robi on this repair, and we were totally stumped! Took all Summer to figure this out: Having two faults (the faulty ROM chip-select PROM and bad RAM) made the troubleshooting difficult. First clue was using the second 9010a/z80 probe to detect that the ROM images were duplicated in two address ranges (due to the faulty chip-select PROM). When this was fixed, we expected to at least be able to get the "OK" display to show up when manually disabling the HW watchdog reset, but no go. We knew the display module itself was good, since we could use it in the second 9010a, and all the diagnostic features worked (triggered via writes to the memory-mapped test registers). We did try the 9010a RAM test, including the "long" test, but it didn't detect any problems. Anyways, one more 9010a back from the dead! (well, we have yet to try it with a pod, but fingers crossed) grant.. On 2017-10-22 10:52 PM, Robert Robert via Techtoolslist wrote: Thanks for the help is apreciated i figured it out there was 2 issues the u62 wa s bad and one ram chip was bad also and the fluke i used with z80 pod didnt pick up the error when it was doing the short ram test so i figured they were good i changed u62 and one ram chip and its booting now thanks for the help its apreci ated Sent from my iPhone On Oct 22, 2017, at 9:19 PM, tonyhtbsusa [1]<tony@htbsusa.com> wrote: I had one do the same thing Power supply cables were loose Unplug and plug back in cables You will find the bad one Tony -----Original Message----- From: Techtoolslist [[2]mailto:techtoolslist-bounces@flippers.com] On Behalf Of Robert Robert via Techtoolslist Sent: Sunday, October 22, 2017 1:49 PM To: [3]techtoolslist@flippers.com Cc: Robert Robert Subject: [Techtoolslist] Fluke 9010a no display Hi can anyone help me with and issue i have with my fluke 9010a when i power it up theres no display showing and it beeps once and at power up then goes silent for a few seconds then starts beeping non stop like its trying to reboot i have swaped a my keyboard and display into a working fluke 90101a and it works good my issue is in the main control board i am following the trouble shooting procedure and i got to this problem i tryed to troubleshoot the watchdog reset circuit and when i use the probe in sync-free-run pulse low mode momentarily connect the probe tip to u31 pin 4 of the uut i get a beep but no display message shows up nothing its supossed to show a message fluke 9000 power up ok ver 3a i did check all grounds and power at the check points and did check the ribbon cable between the display keyboard and main control baord its all good something seems to be blocking the display from going on the watchdog chip has been changed and no luck does anyone have any ideas let me k now thanks Sent from my iPhone _______________________________________________ Techtoolslist mailing list [4]Techtoolslist@flippers.com [5]https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: [6]ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: [7]http://seven.pairlist.net/pipermail/techtoolslist/ _______________________________________________ Techtoolslist mailing list [8]Techtoolslist@flippers.com [9]https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: [10]ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: [11]http://seven.pairlist.net/pipermail/techtoolslist/ _______________________________________________ Techtoolslist mailing list [12]Techtoolslist@flippers.com [13]https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: [14]ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: [15]http://seven.pairlist.net/pipermail/techtoolslist/ References 1. mailto:tony@htbsusa.com 2. mailto:techtoolslist-bounces@flippers.com 3. mailto:techtoolslist@flippers.com 4. mailto:Techtoolslist@flippers.com 5. https://pairlist7.pair.net/mailman/listinfo/techtoolslist 6. ftp://ttl.arcadetech.org/TTL/Test_Equipment 7. http://seven.pairlist.net/pipermail/techtoolslist/ 8. mailto:Techtoolslist@flippers.com 9. https://pairlist7.pair.net/mailman/listinfo/techtoolslist 10. ftp://ttl.arcadetech.org/TTL/Test_Equipment 11. http://seven.pairlist.net/pipermail/techtoolslist/ 12. mailto:Techtoolslist@flippers.com 13. https://pairlist7.pair.net/mailman/listinfo/techtoolslist 14. ftp://ttl.arcadetech.org/TTL/Test_Equipment 15. http://seven.pairlist.net/pipermail/techtoolslist/ _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/