• Code: F9 00
• Description: Communication trouble between MCU and printer PWB (MCU detection). Communication establishment error, framing error, parity error, protocol error
• Causes: Bad connection of printer PWB connector Defective harness between printer PWB and MCU PWB. Motherboard connector pin breakage Printer PWB ROM error, data error
• Remedy: Check connector/harness of printer PWB and MCU PWB. Check grounding of the machine. Check printer PWB ROM.

• Code: F9 10
• Description: Communication trouble between MCU and printer PWB
• Causes: Bad connection of printer PWB connector Defective harness between printer PWB and MCU PWB. Motherboard connector pin breakage Printer PWB ROM error, data error
• Remedy: Check connector/harness of printer PWB and MCU PWB. Check grounding of the machine. Check printer PWB ROM.

• Code: F9 80
• Description: Communication trouble between MCU and printer PWB (Protocol error)
• Causes: Bad connection of printer PWB connector Defective harness between printer PWB and MCU PWB. Motherboard connector pin breakage Printer PWB ROM error, data error
• Remedy: Check connector/harness of printer PWB and MCU PWB. Check grounding of the machine. Check printer PWB ROM.

• Code: H2 00
• Description: Thermistor open detection. Fusing thermistor open
• Causes: Thermistor defect MCU PWB defect Fusing section connector contact failure Power failure Fusing unit not installed
• Remedy: Check the harness and the connector of the thermistor and the MCU. Clear the self diag display with SIM 14.

• Code: H3 00
• Description: Heat roller abnormally high temperature Detail Fusing temperature of 220 - 240°C.
• Causes: Thermistor defect MCU PWB defect Fusing connector connection failure Power failure.
• Remedy: Check the heater lamp blinking with SIM 5-2. When the lamp blinks normally: Check the thermistor and the harness. Check the MCU PWB thermistor input circuit. When the lamp lights up instead of blinking: Check the lamp control circuit of the power PWB and the MCU PWB. Clear the trouble with SIM 14.

• Code: H4 00
• Description: Heat roller abnormally low temperature. When the temperature does not reach 155°C within 55 sec after turning on the power, or when it falls under 145°C during printing, or when it falls under 100°C during pre-heating.
• Causes: Thermistor failure Heater lamp failure MCU PWB failure Thermostat failure Power failure Interlock switch failure
• Remedy: Check blinking of the heater lamp with SIM 5-2. When the lamp blinks normally: Check the thermistor and the harness. Check the MCU PWB thermistor input circuit. When the lamp does not light: Check for heater lamp disconnection or thermostat disconnection. Check the interlock switch. Check the power PWB and MCU PWB lamp control circuit. Clear the trouble with SIM 14.

• Code: L1 00
• Description: Mirror base feed trouble. The mirror home position (MHPS) does not turn off though the feed operation is completed during mirror initial operation after turning on the power. The mirror home position (MHPS) does not turn off during shading operation. The mirror home position (MHPS) does not turn on when the mirror base is returned for the specified time after copy feed is started and SPF scanning position shift is performed.
• Causes: Mirror unit defect Mirror home position sensor defect MCU PWB defect Scanner wire disconnection
• Remedy: Check the scanning operation with SIM 1-1.

• Code: L3 00
• Description: The mirror home position (MHPS) does not turn on though the mirror base returning is completed during mirror initial operation after turning on the power. The mirror home position does not turn on when the mirror is returned to the home position during shading. The mirror home position (MHPS) does not turn on when the mirror base returning is completed for the specified time (about 6 sec) after copy return start.
• Causes: Mirror unit Mirror home position sensor defect MCU PWB defect Scanner wire disconnection
• Remedy: Check the scanning operation with SIM 1-1.