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Markv SDCC Card Change
Correct method for changing SDCC card

Hi all,

We have markv TMR using IDP program in frame6 units. Core <s> stopped on (Default system) and not reach A7. I changed the card, and it's reach A7. But the calibration value different from other <R, S> core, and GCV not open during firing. Please i want to know the procedure of changing this card.

1 out of 1 members thought this post was helpful...


I believe there is a procedure in the Mark V Maintenance Manual, GEH-5980.

You have to set the Berg (hardware) jumpers on the new card in the same positions as on the existing card.

Shut off the 125 VDC power to the core.

Then you have to remove the SLCC from the from of the SDCC card. When removing the cable between the SLCC and the SDCC you have to be very careful not to damage the connectors on the cable; it's easily damaged because there are no pull tabs on the cable.

Then you have to remove the SDCC card and put it on a non-static surface, and you have to remove the socketed PROM chips ONE AT A TIME and place them in the appropriate sockets in the proper orientation on the new card.

One of the tricks I use when swapping DCC/SDCC cards is to remove the U9 EEPROM chip (it does not have a label) from the existing card and put in in place of the U9 EEPROM on the new card. This precludes you from having the set the Voter ID and you also don't have to download anything to the new SDCC card, including the FORMAT command--because all of that information is contained in the old EEPROM, including the Totalizer (Timer and Counter) data.

Then you install the new SDCC card on the card carrier, and replace the SLCC card--again being careful not to damage the cable from the SLCC to the SDCC.

When you power-up the SDCC card, it should go immediately to A7, because you re-used the EEPROM chip with all of the configuration information.

What was the command you used to download to the EEPROM chip? If there is difference between the LVDT calibration constants of <S> and <R> & <T> it seems like there is a problem with I/O Configuration information that was downloaded to the EEPROM. Have you tried re-downloading the IOCFG partition to the EEPROM chip ion the new card?

The I/O Configuration that gets downloaded to the EEPROM chip are then loaded in the RAM of the cards associated with the processor every time the processor gets re-booted (or booted). The LVDT calibration I/O Configuration constants are copied by the TCQA card from the EEPROM chip into the TCQA RAM. This is the only relationship between the LVDT I/O Configuration and the SDCC card--the values stored in the IOCFG partition on the EEPROM chip.

One thing to know: If, during downloading of the EEPROM information to the EEPROM chip the processor suddenly goes to A7--it's a "false" A7. You still need to re-boot the processor (by removing the 125 VDC and then re-applying it after about 30 seconds) in order for all the EEPROM information to get fully loaded in RAM, as necessary.

When you downloaded the EEPROM information to the new EEPROM chip on the new SDCC, did you first download ONLY the FORMAT partition, then re-boot the <S> core? And, then download the USER partition to the EEPROM, and after it finishes downloading (and even if it goes to A7 during or shortly after the download) then you have to cycle the power to <S> core again in order to get all the information to all the cards from the EEPROM chip and to get to a real A7 state.

That's about it. It's not that difficult, especially if you transfer the U9 EEPROM chip from the old card to the new card.

Hope this helps!!!

Thanks too much

I took too much information from your reply. And i up load from <R> then down to <S> after formatting the <S>. Thank you