User`s guide

Chapter 3 Calibration Procedures

Calibration Security Code

4 Unsecure the power supply.

The power supply is unsecured when you press (Secure) key. You will see the

above message from the front panel for one second. The ‘‘CAL MODE’’ message is

displayed on the front panel after above message.

5 Turn off the calibration mode.

Turn off the power supply to exit the calibration mode.

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 component locator drawing on page 111.

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.

UNSECURED

To re-secure the power supply (following calibration), perform this procedure

again.

[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 113.

[2]For serial MY53xx6xxx, remove the short at JP102.

I/O

Secure

Config

I/O

Secure

Config

Power

Error

Calibrate