Yokogawa µR20000 - Manual (Page 15)

3-2 SM 04P02B01-01E
3.2 Self Diagnostic Test
The recorder is provided with complete self diagnostic functions to enhance reliability in
measurement and serviceability.
When you turn ON the power, the recorder will automatically execute the following types
of diagnoses alternately and display the results. After these tests are completed, the
recorder is ready for use.
1. Main program (Flash ROM) test
2. Main RAM write/read test
3. A/D and A/D EEPROM test
4. Memory acquisition test (write test from Flash)
5. Mechanical system test
6. Ethernet module test
The table below shows the results of the self diagnostic tests when a problem is
detected.
Error display Possible Cause
B3 secondary copy error. Problem with CPU Assembly
B4 Flash Device error.
B5 Flash SUM error.
B6 Flash Data error.
902 RAM failure.
910 A/D error. Problem around the A/D Board PCB or EEPROM
951 EEPROM write error.
921 A/D calibration value error. Problem with the A/D Board PCB or wrong adjustment data value for
922 A/D calibration is in the wrong order. the A/D Board PCB.
930 Memory acquisition failure. Problem with CPU Assembly
940 The ethernet module is down. Problem with the COMM PCB or CPU Assembly
950 A/D number error. Problem with the A/D Board PCB (installation of the A/D Board PCB
out of spec)
960 Ribbon error. (Dot model) Problem with the ribbon shift mechanism or Dot CPU
Assembly
961 Printer error. (Dot model) Abnormal movement of the printing carriage or problem
with the Dot CPU Assembly
962 Plotter error. (Pen model) Problem with Pen CPU Assembly
963 Pen 1 error. (Pen model) Abnormal movement of the Pen Servo Assembly or
964 Pen 2 error. problem with the Pen CPU Assembly
965 Pen 3 error.
966 Pen 4 error.