50 Troubleshooting
(between pins J3-3 and J3-4) and return it to the NORM position (between pins J3-7 and J3-8) in order to calibrate the
supply.
Calibration Password
In order to enter the calibration mode, you must use the correct password as described in Appendix A of the Operating
Manual. As shipped from the factory, the supply's model number (e.g., “6652”) is the password. If you use an incorrect
password, "PASSWD ERROR" will appear on the display for front panel calibration (or error code 2 occurs for GPIB
calibration) and the calibration mode will not be enabled.
If you have changed the password and have forgotten it, you can recover the calibration function by restoring the factory
preset calibration constants. To do this, proceed as follows:
a. Turn off the supply and remove the top cover.
b. Install jumper in test header J3 on the front panel board A3 in the FACTORY PRESET CAL position between pins
J3-5 and J3-6. (See Figure 3-3.)
c. Turn on the supply and note that "ADDR 5" and then "PWR ON INIT" appear briefly on the front panel display.
d. When "PWR ON INIT" no longer appears on the display, the supply's factory calibration constants have been restored
and the password has been changed to "0" defeating password protection. You can now turn off the supply, remove the
jumper and return it to the NORM position between pins J3-7 and J3-8. (See Figure 3-3.)
e. Turn on the supply. At this point you can set a new password (if desired) and recalibrate the supply as described in
Appendix A of the Operating Manual.
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