[Techtoolslist] Fluke 9010a no display

[Grant Goodes]

   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 at 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 at flippers.com] On Behalf Of
Robert Robert via Techtoolslist
Sent: Sunday, October 22, 2017 1:49 PM
To: [3]techtoolslist at 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
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References

   1. mailto:tony at htbsusa.com
   2. mailto:techtoolslist-bounces at flippers.com
   3. mailto:techtoolslist at flippers.com
   4. mailto:Techtoolslist at 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 at 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 at 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/