76 34410A/11A/L4411A Service Guide
3 Calibration Procedures
1 Disconnect the power cord and all input connections.
2 Disassemble the instrument using the “General Disassembly” on page 111.
3 Solder a temporary short between the two exposed metal pads on the
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.
4 Apply power and turn on the instrument.
5 The display will show the message “Calibration security has been
disabled”. The instrument is now unsecured.
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 “To Secure for Calibration” on
page 55. Be sure you record the new security code.
Be careful not to touch the power line connections or high voltages on the power
input module and transformer. Power is present even if the instrument is turned off
when the line cord is connected.
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