3 Calibration Procedures
76 Keysight E3633A and E3634A Service Guide
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 the power supply.
2 Remove the instrument cover.
3 Connect the power cord and turn on the calibration mode by holding down
(Calibrate) key as you turn on the power supply and hold down the key
until you hear a long beep. Be careful not to touch the power line connections.
4 Apply a short between the two exposed metal pads on JP5
[1]
(located near
U13). The JP5 is outlined with a circle on the“E3633-60002/E3634-60002
Component Locator for the Main Board” on page 125.
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 JP5
[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 a short between the two exposed metal pads on JP102 (located near
U103). The JP102 is outlined with a circle on the component locator drawing on page 128
[2] For serial MY53xx6xxx, remove the short at JP102.
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