[Techtoolslist] Help troubleshooting a 9010A

[Matt Rossiter]

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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