Matrix T3X-05 - 8.12 02 B9;02 BA;02 BC; 02 BD Error Troubleshooting

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8.12 02B9 / 02BA / 02BC / 02BD ERROR TROUBLESHOOTING
CHAPTER 8: TROUBLESHOOTING
ERROR MESSAGE 02B9 / 02BA / 02BC / 02BD
1) CAUSE:
a. 02B9 - The inner memory IC data write error.
b. 02BA - The inner memory IC data read error.
c. 02BC - Ground connection or fuse error.
d. 02BD - Inverter hardware interrupt error.
2) SOLUTION:
a. Replace the MCB.