[Techtoolslist] fluke 9010a not booting

[William Stillwell]

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 <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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