IBM 6400-I15 Maintenance Manual - Page 97
Illegal External Bus Accessed. Firmware error on the CMX controller board.
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Page 97 highlights
If the message appears, replace the CMX controller board. Record the message and return it with defective CMX board. 114 ILLEGAL OPERAND ACCESS SEE USER'S GUIDE 1. Illegal Operand Accessed. Firmware error on the CMX controller board. Cycle power. Run the print job again. If the message appears, download the emulation software again. 2. Cycle power. Run the print job again. If the message appears, replace the CMX controller board. Record the message and return it with defective CMX board. 115 ILLEGAL INSTRUCTION ACCESS SEE USER'S GUIDE 1. Illegal Instruction Accessed. Firmware error on the CMX controller board. Cycle power. Run the print job again. If the message appears, download the emulation software again. 2. Cycle power. Run the print job again. If the message appears, replace the CMX controller board. Record the message and return it with defective CMX board. 116 ILLEGAL EXTERNAL BUS ACCESS SEE USER'S GUIDE 1. Illegal External Bus Accessed. Firmware error on the CMX controller board. Cycle power. Run the print job again. If the message appears, download the emulation software again. 2. Cycle power. Run the print job again. If the message appears, replace the CMX controller board. Record the message and return it with defective CMX board. 117 A TO D OVERRUN SEE USER'S GUIDE 1. The analog-to-digital converter on the CMX controller board has overflowed. Cycle power. Run the print job again. If the message appears, download the emulation software again. 2. Cycle power. Run the print job again. Troubleshooting 97
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