Agilent Technologies N6751A User Manual page 182

Appendix D Service
Backplane Board Troubleshooting
Calibration and Passwords
Initialization
182
Troubleshooting the backplane board consists of visually inspecting
the pins and pin connections.
If there are missing or broken pins, replace the board.
If there are bent pins, carefully try to straighten the pin. If you are
unsuccessful, replace the board.
Closely examine the solder connections at the pins. If there are
cracks in the solder, carefully re-solder the connector. If
unsuccessful, replace the board.
Calibration is not required after the mainframe has been repaired.
All calibration information is module-specific and resides in each
power module.
However, if boards that contain the calibration switches have been
replaced (A4 board on N6700A mainframes; A5 board on N6700B
mainframes), any calibration password that has been set will be lost.
Passwords that are used to prevent access to the front panel Admin
menu will also be lost.
The calibration password will automatically be reset to the factory
default, which is zero (0). Front panel access to the Admin menu will
be unrestricted unless a password is set.
Refer to the User's Guide for information on setting the calibration
password as well as the Admin menu password.
The power system's model number, serial number, and other
constants that are required to program the instrument are also
stored in an EEPROM on the A5 board. If this board is replaced, the
instrument must be re-initialized.
To initialize the power system, you must send the following
information to the power system over the interface:
DIAGnostic:FRAMe:ATTRibute "ModelNumber", "value"
where "value" is the model number, e.g. N6700B.
DIAGnostic:FRAMe:ATTRibute "SerialNumber", "value"
where "value" is the serial number located on top of the interface
cover.
At power-up, the power system will go through the turn-on self test
sequence. All other parameters will be set to the factory defaults. The
mainframe is now initialized.
Series N6700 User's Guide