[Techtoolslist] UDN6118A vs UDN6118P

[Rodger Boots]

Usually an "N" or "P" suffix means the package is a plastic DIP.  For 
Allegro (used to be Sprague) parts the "A" means plastic DIP---for 
anyone else would have meant improved part.


barry2 at shilmover.com wrote:

> 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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>>>       

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>>     

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>