[Techtoolslist] fluke 9010a not booting

[Grant Goodes]

   Yes, as I said in an earlier posting, having finally acquired a z80
   pod, we have been using my working 9010a to test the bad one, and Bus
   Test is OK, and then going through the various tests described in the
   Service Manual.  That's how we figured out that the U62 bank-select
   PROM was bad.  Alas, the Watchdog and other auxiliary circuitry really
   can't be tested directly by the second 9010a.

   On 2017-08-10 5:47 PM, William Stillwell wrote:

doesn't the 9010 run on a z80, just connect up your pod and test it.

William Stillwell

Board Member - Inspiration labs, Inc. a 501c3 organization

Board Member - West Central Florida Group, Inc. a 501c3 organization

Board Member & Co-Founder - Byte Amusement Group // Free Play Florida
Arcade & Pinball Show a 501c3 organization

Board Member - Clearwater Amateur Radio Society

On Thu, Aug 10, 2017 at 5:37 PM, Grant Goodes [1]<grant.goodes at gmail.com>
wrote:


   Another little tidbit: Before we fixed U62, you'd just get no display,
   and then after maybe 4 seconds, a beep, then nothing more.  Now we
   still have no display, but the unit is silent for a good 8 seconds, and
   _then_ a beep, followed by a new beep every 4 seconds.  The 4 seconds
   is the timeout on the watchdog.  So the unit is doing something for the
   first 8 seconds, and then gives up and goes into a reset loop.
   Also, tested the display/keyboard unit in my good 9010a, and it is
   fine.
   grant..

   On 2017-08-10 5:08 PM, Grant Goodes wrote:

   OK, I've been helping Robert with his problem (when I replied that I
   was helping my friend with a similar problem, I didn't realize he had
   joined the list and asked here about his problem!  My friend and Robert
   are the same person!)
   We did some more debugging:
     * The U62 bank-select PROM _was_ bad, and having reprogrammed a new
       one with correct contents, are getting valid checksums for version
       3A of the firmware on all the ROM contents
     * With the correct contents, and using Run UUT with the second 9010a,
       we hear a new beep every 4 seconds, but no display contents
     * We seem to be seeing a watchdog issue: Running the display and
       keyboard tests (triggered by writing non-zero values to 0x10081),
       we see the tests begin and then stop.  In particular, the display
       tests should run continuously but they stop after ca. 4 seconds,
       which implicates the watchdog
     * Trying R14 to ground, which disables the watchdog, allows the
       display and keyboard tests to run normally: The display unit is
       fine
     * Testing out the Probe PIA, we seem to be seeing correct signals,
       but that testing uses the R14/watchdog-disable, so that may not
       prove anything.

   Does anyone have any ideas on how to debug the Watchdog?  There really
   isn't that much in the Service Manual on this part of the circuit.

   grant..

   On 2017-08-08 3:05 PM, robert via Techtoolslist wrote:

my fluke 9010a rev 3a is not booting the diplay doesnt go on i think its a
watch
dog problem i have the service manual but it doesnt seem to cover the 3a
rev fir
mware for the rom signatures all my power test points are good and also i
get a
beep when power on but no display does anyone have any idea what could be
the ca
use of the shutdown
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References

   1. mailto:grant.goodes at gmail.com
   2. mailto:1]Techtoolslist at flippers.com
   3. https://pairlist7.pair.net/mailman/listinfo/techtoolslist
   4. ftp://ttl.arcadetech.org/TTL/Test_Equipment
   5. http://seven.pairlist.net/pipermail/techtoolslist/
   6. mailto:Techtoolslist at flippers.com
   7. https://pairlist7.pair.net/mailman/listinfo/techtoolslist
   8. ftp://ttl.arcadetech.org/TTL/Test_Equipment
   9. http://seven.pairlist.net/pipermail/techtoolslist/
  10. mailto:Techtoolslist at flippers.com
  11. https://pairlist7.pair.net/mailman/listinfo/techtoolslist
  12. ftp://ttl.arcadetech.org/TTL/Test_Equipment
  13. http://seven.pairlist.net/pipermail/techtoolslist/
  14. mailto:Techtoolslist at flippers.com
  15. https://pairlist7.pair.net/mailman/listinfo/techtoolslist
  16. ftp://ttl.arcadetech.org/TTL/Test_Equipment
  17. http://seven.pairlist.net/pipermail/techtoolslist/