[Techtoolslist] Help troubleshooting a 9010A

[barry2 at shilmover.com]

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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