HP 330 Service Information Manual page 63

010 Backplane
Each 2- and 4-slot DIO adaptor has a backplane for cards to connect to. When this backplane
needs to be replaced, here's what you need to do.
Remove these parts first.
1. Power cord after turning the unit off.
2. Power supply access cover.
3. Top cover.
4. DIG adaptor.
Procedures
CAUTION
Note the motherboard DIO-II and backplane DIO connectors each
ribbon cable is attached to. Mark the ribbon cables, if necessary to
help you remember.
When replacing the backplane, these ribbon cables must be recon-
nected correctly. Otherwise, smoke, fire, and brimstone may surely
emit from this marvelous Hewlett-Packard product. So, please watch
out and put it back together right.
1. Note what ribbon cable is attached to the motherboard and backplane connectors, then
remove the ribbon cables from the backplane.
2. Remove the screws holding the backplane PC board to the card guides. The number of
screws will differ depending on the specific backplane.
Note
If the DIG backplane is installed with the ribbon cables hooked up to
the backplane's top two connectors and a DIG card is installed, the
card won't work. There are no power traces from the top backplane
connectors to the DIG card slots. Ribbon cables must connect only to
the bottom backplane connectors.
3. To install a backplane, reverse these steps.
Assembly Replacement
47