Experimental Physics and
Industrial Control System

Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov> · Thu, 13 Aug 2020 08:34:34 -0700

On 8/13/20 5:50 AM, Amit Chauhan via Tech-talk wrote:
> Dear Heinz,
> 
> Ya I have checked all the voltages and they are fine.
> 
> The boards are not working in other VME crates also.
> 
> Can some momentary power transition (over voltage, spike, ripple) affect the boards in this way ?

If your boards were assembled in the late 2000's, and are kept in a sealed
or semi-sealed environment, you might take a closer look at the PCBs.
While at NSLS2, we had a batch of mvme3100 boards assembled during that time,
with lead free solder, develop Sulfur Creep Corrosion.  This results in
random shorts around the PCB and strange failures.

https://www.google.com/search?q=sulfur+creep+corrosion&source=lnms&tbm=isch&sa=X

> Regards,
> Amit
> 
> 
> On 13-08-2020 13:28, Heinz Junkes wrote:
>> Have you checked the power supplies. Are all voltages present?
>> +5 V
>> -5 V (?)
>> +12 V
>> -12 V
>>
>> Viele Grüße
>> Heinz
>>
>>
>>> On 13. Aug 2020, at 07:55, Amit Chauhan via Tech-talk <tech-talk at aps.anl.gov> wrote:
>>>
>>> Hi Mark,
>>>
>>> The problem we are facing is that a couple of boards that were working since a long time have developed fault in-situ and stopped working.
>>>
>>> The indication LEDs labelled FAIL (for board fail signal) and STAT (for halt conditions) are continuously glowing. There is no communication on serial port.
>>>
>>> Regards,
>>> Amit
>>>
>>>
>>> On 07-08-2020 17:13, Mark Rivers wrote:
>>>> Hi Amit,
>>>>
>>>>
>>>> What kind of hardware issues are you having?
>>>>
>>>>
>>>> One of the problems we had several times was that when the boards were installed or removed from the VME crate the back side of the board could scrape against the VME chassis and damage some of the solder connections or wire jumpers.  Look carefully at the back side of the board for such damage.  We were able to fix them with wire jumpers.
>>>>
>>>>
>>>> I think there is also a battery that can need replacing that is used for the "non-volatile" memory where the boot parameters are stored.
>>>>
>>>>
>>>> Mark
>>>>
>>>>
>>>>
>>>> ________________________________
>>>> From: Tech-talk 
>>>> <tech-talk-bounces at aps.anl.gov> on behalf of Amit Chauhan via Tech-talk <tech-talk at aps.anl.gov>
>>>>
>>>> Sent: Friday, August 7, 2020 2:21 AM
>>>> To: 
>>>> tech-talk at aps.anl.gov
>>>>
>>>> Subject: MVME-162 CPU Boards
>>>>
>>>> Dear All,
>>>>
>>>> The subject matter of this mail may seem little out of context as far as EPICS is considered. But I believe this community has quite a wide experience and expertise on related matters also.
>>>>
>>>> This is regarding VME based CPU boards from Motorola which were once very popular : MVME-162 ( 68040 processor based)
>>>>
>>>> I would like to know if anyone has experience of hardware troubleshooting and repairing of these boards.
>>>>
>>>> Thanks & Regards,
>>>> Amit
>>>>
>>>>
>>>>
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System