Technical data

Field Replaceable Units
Replacing a 743 System Board
5-11
Replacing a 743 System Board
This section provides step-by-step instructions for replacing a system board.
NOTE: If your 743 is configured as a dual VME slot computer, once the
accessory boards, cards, any stacked RAM and Front Panel
extension are removed the computer is in effect a single slot
computer and can be dealt with as such for work on EEPROMs,
PCMCIA (743rt only) and single RAM cards.
The Model 743 board computer’s system board typically has one or more accessories
attached. Remove the following accessories before returning a failed system board to
Hewlett- Packard’s board exchange program.
Single VME slot 743:
RAM cards
Front panel
EEPROMs
PCMCIA Adapter and Flash Disk card (743rt only)
Dual VME slot 743:
RAM cards
3 x 5 GSC Cards
Graphics
FWD SCSI
HCRX Graphics board or Expansion Kit adapter fixture
EEPROMs
PCMCIA Adapter and Flash Disk card (743rt only)
Front panel and Front panel extension
Preliminary Requirements
Perform the following steps before replacing the system board:
1 Perform the steps in the Preliminary Procedures section of this chapter.
2 Remove the board computer from its VMEbus chassis (as explained in the “Removal
and Replacement of the 743” section of this chapter.)