PPC7A Product Manual
Technical Assistance
9-2
1
st
Edition
Troubleshooting
If you are experiencing a problem with your PPC7A, there follow some general suggestions of actions
you may take, which may resolve the problem without the need to contact Radstone’s technical support.
•
Ensure that the board is firmly seated and secured in the rack and that all male/female
connectors mate together correctly
•
Check the links on the board and the system backplane
•
If you are unsure of which link configuration to use, try the default configuration (see Chapter
4) initially
•
Check that the VME rack has terminators, if these are not built in (the manual for your rack
should tell you whether the terminators are built in)
•
Using a digital volt meter, check that the power supply is within VME limits on +5V, +12V
and -12V
!
WARNING
Power supply problems should only be dealt with by qualified personnel.
•
Check that there is only one board configured as system controller in a system and that this is in
slot 1 of the rack
•
Check that there are no vacant slots in the rack without jumpers (or that an automatic daisy
chaining backplane is being used)
•
Prove the PPC7A’s operation in isolation before adding it into a multi-board system
•
If you are using the SCSI bus, then check that the cable stub length is less than 10 cm. You are
also recommended to locate the PPC7A
at one end and enable the bus terminator by fitting link
E13. If you want to use the PPC7A
somewhere other than at the end of the SCSI bus, ensure
that E13 is not fitted.
Fitting E13 when the PPC7A is not located at the end of a SCSI bus
may cause erroneous SCSI operation.
•
If you have made your own cable for connection between P7 or P2 and a
terminal/hyperterminal, check that the pinout is correct
•
Check that the terminal is set up for DTE (9.6 kbaud, 8 bits/character, 1 stop bit, parity
disabled)
•
Ensure that air-cooled PPC7As receive sufficient air-flow. If you need to operate your PPC7A
on an extender card, this requires an additional fan to supply the necessary air flow
•
Ensure that conduction cooled PPC7As are fully installed in the conduction cooled box and that
the wedgelocks are correctly tightened. If, for any reason, you need to operate a conduction
cooled PPC7A
on an extender card, you must maintain an airflow of at least 300 feet/minute
over it
•
If you are having problems programming the FLASH, then check that the appropriate write
enable link, E3 or E9, is fitted, and that the backplane signal, FLASH_WP~ (P0 pin A2) is
connected to GND or E5 is fitted. See the FLASH section in Chapter 8 and the E3, E5 and E9
descriptions in Chapter 4 for more details
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