That P8041a is none other than your friendly neighborhood Programmable
Microcontroller.
http://games.rossiters.com/manuals/fluke/Intel-8041A.pdf
You can replace that with an 8742 but it needs to be programmed. I don't
recommend the 8741 replacement since they seem to be slower than the 8041A
and don't function very well - at least that was my experience with
replacing the 8041a on the Tape Drive.
I put the rom image here.
http://games.rossiters.com/manuals/fluke/Fluke-9010a-Display-Rom.BIN If
you don't have a programmer that can do these let me know privately.
I would dig around the internet, including ebay for the UDN6118A chips.
Unicornelectrics carries the 8742.
Matt
On Thu, 28 May 2009 01:03:53 -0400, barry2@shilmover.com wrote:
> Okay,
> Been working on the units and I am finally getting somewhere.
> - I blew U1 on the Display board. Anyone know what chip this is? (its
the
> large 40-pin chip) Marking:
> P8041A 1210
> 8423
> 535419
> Intel '77
> I confirmed that this was the issue by swapping it out between the
> displays.
>
> Display 1:
> - Missing the bottom right segment on all digits (I believe its segment
'c'
> according to the schematic, Figure 8-3). Any idea what would cause this?
>
> Display 2:
> - 10th character sometimes disappears, sometimes is faded, sometimes is
> fine. I traced that this is controlled by U4 (pin 11) and U8 (pins 2 &
> 17). I can replace both, but which is the most likely problem? Anyone
> know where I can get U8 (UDN6118A) chips?
>
> Thanks for the help so far.
>
> Barry
>
> ---------------------------------
> So I got both systems working, on to the next problem.
>
>
The display on one is missing a few of the lines (mostly the bottom right
>
> ones). any idea where to start?
>
>
The other, the display flashes random characters and beeps. Thing that ticks
>
>
me off is that it was mostly working (one character was dim) and I unplugged
>
> the connector thinking the power was off. What damage did I do?
>
> Barry
>
> I meant PDF page 131
>
> Matt
>
> On Tue, 26 May 2009 22:18:04 -0700, Matt Rossiter <matt@rossiters.com>
> wrote:
>> Some of the Fluke 9010a's (mine for example) might be different than
> these
>> schematics, but you can look here on pdf page 137.
>>
>
http://arcarc.xmission.com/Test%20Equipment/Fluke/9010A%20Base/9010A%20Service%2
>
>
> 0Manual.pdf
>>
>> You should know how to convert Hex to Binary.
>> HEX-08 -> D7=0 D6=0 D5=0 D4=0 D3=1 D2=0 D1=0 D0=0
>>
>> If it's reporting BTS 8 is failing - then check the 4116 ram chip
>> responsible for D3 - which is at locate U12.
>>
>> If BTS 12 are failing, it means D3 and D2 are stuck. So check U11 and
> U12
>> or their buffers.
>>
>> Matt
>>
>> On Tue, 26 May 2009 21:41:10 -0400, barry2@shilmover.com wrote:
>>> Hooked up the 2nd 9010A. It returns:
>>>
>>> R/W ERR @ C000 BTS 12 - LOOP?
>>>
>>> Barry
>>>
>>> ----------------------
>>>
>>> I been having trouble posting to the group... trying again.
>>>
>>> I have 2 non-working 9010A units. On both they beep once, LEDs flash,
>> then
>>>
>>> nothing.
>>>
>>> Hooked up a working 9010A that I borrowed (thanks David). Bus tests
>> fine.
>>> RAM
>>> returns the following:
>>>
>>> R/W ERR @ C000 BTS 08 - LOOP?
>>>
>>> Manual states:
>>> If a RAM failure occurs, carefully examine the diagnostic message. The
>>>
>> RAM
>>>
>>> Test is usually sufficient for deducing the failed component directly.
>>>
>>> It then does not explain how to read the message. :-) I am new to
> this,
>>> so be
>>> kind if its a stupid question.
>>>
>>> I deduced that there is a Read/Write error at C000. How do I "deduce"
>> the
>>> failed component?
>>>
>>> Barry
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