[Techtoolslist] UDN6118A vs UDN6118P

[barry2 at shilmover.com]

All,

I found some old Williams display boards with UDN6118P chips on them.  I could not find a pdf for them.

what are the differences between the A and P chips?  Are they interchangeable?

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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