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Service Procedures 175
Appendix D
Unsecuring the
Function Generator
(Lost Security Code)
To unsecure the function generator without the correct security code, follow
the steps below. A procedure to unsecure the function generator is given on
page 174. Also see “Electrostatic Discharge (ESD) Precautions” in chapter
6 before beginning this procedure.
1. Turn off power to the VXI mainframe, disconnect all input
connection, and remove the module from the mainframe.
2. Remove the instrument’s left cover (tall cover):
A. First loosen the nuts around each BNC connectors. This is to avoid
damaging the cover-to-faceplate EMC gasket.
B. Remove the seven Torx screws holding the cover.
C. While gently pulling the right side of the faceplate away from the
cover’s EMC gasket, lift that end of the cover. Once the gasket is
clear of the faceplate, remove the cover from the instrument.
3. Install a VXIbus extender card into the mainframe and install the
instrument into the extender.
4. Apply power to the mainframe.
5. Apply a short between the two exposed metal pads on JM101 (located
near U106 and U205) Figure D-1.
6. While maintaining the short, enter any unsecure code. The function
generator is now unsecured.
Figure D-1. Unsecuring the Agilent E1441A (without security code)