Calibration Procedures 1
Keysight E3632A Service Guide 41
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. Refer to “Electrostatic
Discharge (ESD) Precautions” on page 62 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, and 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 JP5
[1]
(located near
U13). Refer to “Component locator diagram for the main board assembly —
top” on page 71.
5 While maintaining the short, press Secure to 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 the short at JP12 (located near U36). Refer to “Component locator
diagram for the main board assembly — top (serial MY53xx6xxx)” on page 73.
[2] For serial MY53xx6xxx, remove the short at JP12.
To re-secure the power supply (following calibration), perform this procedure
again.
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