I looked at one of my spare 9010a tape modules this morning and noticed
it's using an Intel 8741a - so I could be partially wrong that you
shouldn't replace 8041a's with 8741a's. The set I bought off ebay just
wouldn't operate even though I could program them and they tested ok. Just
to be safe I would still go with something a little faster. :)
Matt
On Thu, 28 May 2009 00:32:07 -0700, Matt Rossiter <matt@rossiters.com>
wrote:
> 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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Received on Thu May 28 11:34:22 2009
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