Agilent Technologies 34410A Service Manual page 76

3 Calibration Procedures
1 Disconnect the power cord and all input connections.
2 Disassemble the instrument using the
3 Solder a temporary short between the two exposed metal pads on the
4 Apply power and turn on the instrument.
Be careful not to touch the power line connections or high voltages on the power
WARN IN G
input module and transformer. Power is present even if the instrument is turned off
when the line cord is connected.
5 The display will show the message "Calibration security has been
6 Turn off the instrument and remove the power cord.
7 Remove the temporary short installed in step 3.
8 Reassemble the instrument.
Now you can enter a new security code, see
page 55. Be sure you record the new security code.
76
main PC board assembly. The general location is shown in the figure
below. On the 34410/11A PC board, the pads are marked JM101. On the
L4411A the pads are marked UNSEC.
34410A/11A
disabled". The instrument is now unsecured.
"General Disassembly"
L4411A
"To Secure for Calibration"
34410A/11A/L4411A Service Guide
on page 111.
on