• Code: E503-0051
• Description: Error in communication between the Integration Unit - Professional Puncher (Finisher-D1). Communication failed between the Integration Unit - Professional Puncher
• Remedy: 1. The connector on the cable between the Integration Unit and the Professional Puncher is disconnected. 2. The cable between the Integration Unit and the Professional Puncher is faulty. 3. The Integration Controller PCB is faulty. 4. The Professional Puncher Controller PCB is faulty.

• Code: E503-0053
• Description: Error in communication between the Integration Unit - Professional Puncher (Professional Puncher Integration Unit-B1). Communication failed between the Integration Unit - Professional Puncher (Error in communication of Professional Puncher)
• Remedy: 1. The connector on the cable between the Integration Unit and the Professional Puncher is disconnected. 2. The cable between the Integration Unit and the Professional Puncher is faulty. 3. The Integration Controller PCB is faulty. 4. The Professional Puncher Controller PCB is faulty.

• Code: E503-0061
• Description: Error in communication between the Finisher - Paper Folding Unit (Finisher-D1). Communication failed between the Finisher - Paper Folding Unit
• Remedy: 1. The connector on the cable between the Finisher and the Paper Folding Unit is disconnected. 2. The cable between the Finisher and the Paper Folding Unit is faulty. 3. The Finisher Controller PCB is faulty. 4. The Paper Folding Unit Controller PCB is faulty.

• Code: E503-0062
• Description: Error in communication between the Finisher - Paper Folding Unit (Paper Folding Unit-H1/Finisher-D1). Communication failed between the Finisher - Paper Folding Unit
• Remedy: 1. The connector on the cable between the Finisher and the Paper Folding Unit is disconnected. 2. The cable between the Finisher and the Paper Folding Unit is faulty. 3. The Finisher Controller PCB is faulty. 4. The Paper Folding Unit Controller PCB is faulty.

• Code: E503-0081
• Description: Error in communication between the Saddle Stitcher - Trimmer (Finisher-D1). Communication failed between the Finisher - Trimmer
• Remedy: 1. The connector on the wiring between the Saddle Stitcher and the Trimmer is disconnected. 2. The wiring between the Saddle Stitcher and the Trimmer is faulty. 3. The Trimmer Controller PCB is faulty. 4. The Saddle Stitcher Controller PCB is faulty. 5. The Finisher Controller PCB is faulty.

• Code: E503-0082
• Description: Error in communication between the Saddle Stitcher - Trimmer (Finisher-D1). Communication failed between the Finisher - Trimmer
• Remedy: 1. The connector on the wiring between the Saddle Stitcher and the Trimmer is disconnected. 2. The wiring between the Saddle Stitcher and the Trimmer is faulty. 3. The Trimmer Controller PCB is faulty. 4. The Saddle Stitcher Controller PCB is faulty. 5. The Finisher Controller PCB is faulty.

• Code: E505-0001
• Description: Finisher back-up RAM (EEPROM) error (Finisher-D1/E1). The checksum for the EEPROM data has an error. (The value written in EEPROM and the value extracted from EEPROM doesn't conform.)
• Remedy: The Finisher Controller PCB is faulty.

• Code: E505-0003
• Description: Insertion unit back-up RAM error (Finisher-D1). The value written in EEPROM and the value extracted from EEPROM doesn't conform.
• Remedy: The Insertion Unit Controller PCB is faulty.