• Code: C6704
• Description: Image input time out. Image data is not input from the scanner to the MFP board (MFPB).
• Causes: • MFP board (MFPB) • CCD board (CCDB)
• Remedy: 1. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Memory Bus Check] -> [Scanner -> Memory], and conduct the memory bus function. 2. Check the connector between CCDB CN3-MFPB CN1 for proper connection and correct as necessary. 3. Replace MFPB. 4. Replace CCDB.

• Code: C6751
• Description: CCD gain adjustment failure. • The adjustment value is 0 or 255 during a CCD clamp adjustment. • The peak value of the output data is 64 or less during a CCD gain adjustment.
• Causes: • LED exposure unit • CCD board (CCDB) • MFP board (MFPB)
• Remedy: 1. Check the connector between CCDB CN3-MFPB CN1 for proper connection and correct as necessary. 2. Check for possible extraneous light and correct as necessary. 3. Clean the lens, mirrors, CCD surface, and shading sheet if dirty. 4. Correct reflective mirror of the scanner if faulty, or change scanner mirror. 5. Replace CCDB. 6. Replace MFPB.

• Code: C6752
• Description: ASIC clock input error (front side). When starting the machine, verification on reading and writing the predetermined value for image processing ASIC on CCD board (CCDB) was conducted, and verification failure was detected.
• Causes: • CCD board (CCDB) • MFP board (MFPB)
• Remedy: 1. Correct the harness connection of CCDB if faulty. 2. Replace CCDB 3. Replace MFPB.

• Code: C6753
• Description: ASIC clock input error (back side) (When DF-704 is installed). When starting the machine, verification on reading and writing the predetermined value for image processing ASIC on dual scan image processing board (DSIPB) was conducted, and verification failure was detected.
• Causes: • CIS module (CIS) • Dual scan image processing board (DSIPB) • MFP board (MFPB)
• Remedy: 1. Correct the harness connection between DFCB and DSIPB if faulty. 2. Correct the harness connection between DSIPB CN01-MFPB CN22 if faulty. 3. Replace CIS. 4. Replace DSIPB. 5. Replace MFPB.

• Code: C6754, C6755
• Description: • C6754: CIS clamp adjustment failure (When DF-704 is installed) • C6755: CIS gain adjustment failure (When DF-704 is installed) • C6754: After the gain adjustment is performed at the start-up, the CIS clamp adjustment value is too high or too low. • C6755: After the gain adjustment is performed at the start-up, the peak value of the output data is lower than a given value.
• Causes: • CIS module (CIS) • Dual scan image processing board (DSIPB) • CIS power supply (CISPU) • MFP board (MFPB)
• Remedy: 1. Correct the harness connection between CIS and DSIPB if faulty. 2. Correct the harness connection between CIS J222-CISPU J2 if faulty. 3. Check for possible extraneous light and correct as necessary. 4. Clean the back side reading glass and the shading sheet if dirty. 5. Replace CIS. 6. Replace DSIPB. 7. Replace CISPU. 8. Replace MFPB.

• Code: C6756
• Description: CCD power-supply voltage malfunction. Power is not supplied to CCD after the lapse of a given period of time after the main power switch or power key is turned ON or the machine recovers from the sleep mode.
• Causes: • CCD board (CCDB) • Scanner drive board (SCDB) • DC power supply (DCPU)
• Remedy: 1. Correct the harness connection between CCDB CN5-SCDB CN5 if faulty. 2. Correct the harness connection between SCDB CN1-DCPU CN5 if faulty. 3. Replace CCDB. 4. Replace SCDB. 5. Replace DCPU.

• Code: C6901, C6902, C6903
• Description: • C6901: DSC board mount failure 1 (When SC-508 is installed) • C6902: DSC board bus check NG1-1 (When SC-508 is installed) • C6903: DSC board bus check NG1-2 (When SC-508 is installed). • C6901: When MFP detects that DSC board/1 (front side) is not properly installed. • C6902, C6903: When DSC bus check (front side) detects an error.
• Causes: • DSC board/1 (DSCB/1: SC-508) • MFP board (MFPB)
• Remedy: 1. Correct the harness connection of DSCB/1 if faulty. 2. Replace DSCB/1. 3. Replace MFPB.

• Code: C6911, C6912, C6913
• Description: • C6911: DSC board mount failure 2 (When DF-704 + SC-508 is installed) • C6912: DSC board bus check NG2-1 (When DF-704 + SC-508 is installed) • C6913: DSC board bus check NG2-2 (When DF-704 + SC-508 is installed). • C6911: When MFP detects that DSC board/2 (back side) is not properly installed. • C6912, C6913: When DSC bus check (back side) detects an error.
• Causes: • DSC board/2 (DSCB/2; SC-508) • Dual scan image processing board (DSIPB; DF-704) • MFP board (MFPB)
• Remedy: 1. Correct the harness connection of DSCB/2 if faulty. 2. Correct the harness connection of DSIPB if faulty. 3. Replace DSCB/2. 4. Replace DSIPB. 5. Replace MFPB.