Chapter 3 Calibration Procedures
Calibration Security Code
64
To Unsecure the Power Supply Without the Security Code
To unsecure the power supply without the correct security code (when you
forget the security code), follow the steps below. See "Electrostatic Discharge
(ESD) Precautions" in chapter 5 before beginning this procedure.
1
Disconnect the power cord and all load connections from front terminals.
2
Remove the instrument cover. Refer to the disassembly drawing on page 123.
3
Connect the power cord and turn on the calibration mode by pressing the
"Calibrate" key while simultaneously turning on the power supply then
continue to hold the "Calibrate" key for about 5 seconds until a beep is heard.
Be careful not to touch the power line connections.
4
Apply a short between the two exposed metal pads on JP1 (located near main
controller U17 on the top board). The exposed metal pads are outlined with a
small rectangular silkscreen. (See the component locator drawing for the
E3631-60002 top PC board on page 124.)
5
While maintaining the short, move to the security code and enter any unsecure
code in the calibration mode. The power supply is now unsecured.
6
Remove the short at JP1. (An error occurs if not removed.)
7
Turn off and reassemble the power supply.
Now you can enter a new security code. Be sure you take note of the new
security code.
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