A fault was detected on the I2C bus.

Choose the model or I/O expansion unit on which you are working:

• Instructions for the 9406-MMA, 9117-MMA
• Instructions for the 5790, 7311-D11 and 0595, 5095, D20 I/O expansion units
• Instructions for the 5796, 7314-G30 I/O expansion unit

Instructions for the 9406-MMA, 9117-MMA

1. Is the reference code 3100 or 3105?
   • No: Continue with the next step.
   • Yes: Replace the Service processor card, use the following table to determine the part number for the field replaceable unit (FRU):

     CCIN or FFC	Type and model	Part number	Description	Location code
     	9406-MMA, 9117-MMA	10N8752	Service processor card	Un-P1-C11

     This ends the procedure.

2. Is the reference code 3114?
• No: Return to Beginning problem analysis in the Problem Analysis guide, order number SA76-0111.
• Yes: Replace the following FRUs one at a time, use the following table to determine the part number for the field replaceable unit (FRU):

  CCIN or FFC	Type and model	Part number	Description	Location code
  	9406-MMA, 9117-MMA	42R7352	I/O backplane	Un-P1
  	9406-MMA, 9117-MMA	10N8752	Service processor card	Un-P1-C11

  This ends the procedure.

Instructions for 5790, 7311-D11 and 0595, 5095, D20 I/O expansion units

1. Is the reference code 3100, 3104, 3105, 3116, or 3118?
   • No: Continue with the next step.
   • Yes: Replace the I/O backplane, use the following table to determine the part number for the field replaceable unit (FRU):

     CCIN or FFC	Type and model	Part number	Description	Location code
     	5790, 7311-D11	80P6626	I/O backplane	Un-P1
     	0595, 5095, 7311-D20	39J0515	I/O backplane	Un-P1

     This ends the procedure.

2. Is the reference code 3101 or 3115?
   • No: Continue with the next step.
   • Yes: Replace the following FRUs one at a time, use the following table to determine the part number for the field replaceable unit (FRU):

     CCIN or FFC	Type and model	Part number	Description	Location code
     	5790, 7311-D11	23R0181	I/O backplane	Un-P1
     250D	0595, 5095, 7311-D20	53P0330	Operator panel	Un-NB1
     	0595, 5095, 7311-D20	39J0515	I/O backplane	Un-P1
     	0595, 5095, 7311-D20	53P0414	Signal cable connecting the display panel to the I/O backplane	Un-P1

     This ends the procedure.
3. Is the reference code 3102, 3113, or 3114?
   • No: Continue with the next step.
   • Yes: Replace the following FRUs one at a time, use the following table to determine the part number for the field replaceable unit (FRU):

     CCIN or FFC	Type and model	Part number	Description	Location code
     	5790, 7311-D11	80P6626	I/O backplane	Un-P1
     	0595, 5095, 7311-D20	39J0515	I/O backplane	Un-P1

     This ends the procedure.

4. Is the reference code 3103 or 3112?
   • No: Continue with the next step.
   • Yes: Replace the following FRUs one at a time, use the following table to determine the part number for the field replaceable unit (FRU):

     CCIN or FFC	Type and model	Part number	Description	Location code
     	5790, 7311-D11	80P6626	I/O backplane	Un-P1
     	0595, 5095, 7311-D20	39J1695	Disk drive backplane	Un-DBn
     	0595, 5095, 7311-D20	39J0515	I/O backplane	Un-P1

     This ends the procedure.
5. Is the reference code 3121?
   • No: Return to Beginning problem analysis in the Problem Analysis guide, order number SA76-0111. This ends the procedure.
   • Yes: Is this for 7311-D11?
     • No: Replace the device board (disk drive backplane) 1

       CCIN or FFC	Type and model	Part number	Description	Location code
       	0595, 5095, 7311-D20	39J1695	Disk drive backplane 1	Un-DB1

       This ends the procedure.
     • Yes: Replace the following FRUs one at a time, until the problem is resolved:

       CCIN or FFC	Type and model	Part number	Description	Location code
       	5790, 7311-D11	03N5633	RIO/HSL adapter	Un-P1-C7
       	5790, 7311-D11	80P6626	I/O backplane	Un-P1
       	0595, 5095, 7311-D20	39J0523	RIO/HSL adapter	Un-P1-C05
       	0595, 5095, 7311-D20	39J0515	I/O backplane	Un-P1

       This ends the procedure.

Instructions for the 7314-G30 I/O expansion units

1. Is the reference code 3100, 3101, 3118, 310A, or 310B?
• No: Continue with the next step.
• Yes: Replace following FRUs one at a time. Use the following table to determine the part number for the field replaceable unit (FRU):

  CCIN or FFC	Type and model	Part number	Description	Location code
  	5796, 7314-G30	41L6022	SPCN card	Un-P1-C8
  	5796, 7314-G30	10N7677	I/O backplane	Un-P1
  	5796, 7314-G30	10N7008	Dual-port 12X Channel Attach adapter	Un-P1-C7

  This ends the procedure.
2. Is the reference code 3102, 3103, 3104, 3114, 3121, 3122, 3123, or 3124?
   • No: Continue with the next step.
   • Yes: Replace the following FRUs one at a time. Use the following table to determine the part number for the field replaceable unit (FRU):

     CCIN or FFC	Type and model	Part number	Description	Location code
     	5796, 7314-G30	10N7677	I/O backplane	Un-P1
     	5796, 7314-G30	41L6022	SPCN card	Un-P1-C8
     	5796, 7314-G30	10N7008	Dual-port 12X Channel Attach adapter	Un-P1-C7

     This ends the procedure.

3. Is the reference code 3106, or 3115?
• No: Continue with the next step.
• Yes: Replace the following FRUs one at a time. Use the following table to determine the part number for the field replaceable unit (FRU):

  CCIN or FFC	Type and model	Part number	Description	Location code
  	5796, 7314-G30	42R4491	Power supply	Un-Ex
  	5796, 7314-G30	41L6022	SPCN card	Un-P1-C8
  	5796, 7314-G30	10N7677	I/O backplane	Un-P1

  This ends the procedure.
4. Is the reference code 3105, or 3125?
• No: Return to Beginning problem analysis in the Problem Analysis guide, order number SA76-0111.
• Yes: Replace the following FRUs one at a time. Use the following table to determine the part number for the field replaceable unit (FRU):

  CCIN or FFC	Type and model	Part number	Description	Location code
  	5796, 7314-G30	10N7008	Dual-port 12X Channel Attach adapter	Un-P1-C7
  	5796, 7314-G30	10N7677	I/O backplane	Un-P1
  	5796, 7314-G30	41L6022	SPCN card	Un-P1-C8

  This ends the procedure.