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.
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.
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.