Lake Shore Model 421 Gaussmeter User’s Manual6-8 Service " - %7=B( - !"( )7=B+" B9A. / ( )G>+= H= I H / ?C H?C I H / = // /09. ?C : / 9. / & , 9C-421-6-6.epsFigure 6-6. Location of Operation Software EPROM and Analog Output Jumper6.8 ERROR MESSAGESThe following is a list of Model 421 error messages that may be seen during normal operation.OL Field range has been exceeded. Refer to Paragraph 3.5 to change Range.** No Probe ** No probe attached to the instrument at power up. Power the instrument off, attach aprobe, and power it on again.Locked Keypad is locked to prevent accidental parameter changes. To unlock keypad referto Paragraph 3.13.Error 1 NOVRAM memory is physically malfunctioning. Contact Lake Shore service forrepair.Error2 NOVRAM memory is not initialized properly. Memory can be reinitialized asdescribed in Paragraph 3.15. This operation will not restore calibration data that mayhave been corrupted. Instrument calibration should be checked after any Error 2condition. Contact Lake Shore service for repair or calibration.
