[Techtoolslist] Help troubleshooting a 9010A

[Matt Rossiter]

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 at 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 at 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 at 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 at 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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