HP 9000 Series 300 - Page 36

Locating a Defective RAM Card
The RAM failure message may be decoded to determine which RAM card caused the failure.
For example, in the message
Memory Failed at FB53A9
W:F58A8C2C,R:F78A8C2C
the failure occured at memory address FB53A9. To correlate this with a RAM card, take the
first two letters or digits of the address and translate them into binary. Then find a card whose
address switches are set to the first four or six bits of that address.
For instance, in
the above example, FB is • • •• • 0 •• in binary. Therefore, the switches on
the defective board would be:
if a 1M
byte card, or if a 256K hyte card.
If you are unable to find a memory card with the appropriate switch setting, the failure is in
RAM located on the processor board.
32 Diagnostics