Chapter 3 Calibration Procedures
Calibration Security Code
68
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.
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
[1]
(located near the 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 109.)
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
[2]
. (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.
[1]For serial MY53xx6xxx, apply the short at JP2 (located near the main controller
U10 on the top board). See the component locator drawing for the top PC board
(MY53xx6xxx) on page 112.
[2]For serial MY53xx6xxx, remove the short at JP2.
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