• Code: 534-001, 534-002
• Description: -001 B Fan alarm 3: A3 LCT rear air assist fan 3 -002 B Fan alarm 3: A3 LCT rear air assist fan 3 The machine detects a fan alarm signal from front or rear air assist fan 3 for 0.7 second after the paper exit motor has started rotating for 1 second.
• Causes: • An obstruction has stopped front or rear air assist fan 3. • Harness disconnected
• Remedy: 1. Check the harness connection to front or rear air assist fan 3. 2. Replace front or rear air assist fan 3.

• Code: 535-001, 535-002
• Description: -001 B Fan alarm 3: A3 LCT rear air assist fan 4 -002 B Fan alarm 3: A3 LCT rear air assist fan 4 The machine detects a fan alarm signal from front or rear air assist fan 4 for 0.7 second after the paper exit motor has started rotating for 1 second.
• Causes: • An obstruction has stopped front or rear air assist fan 4. • Harness disconnected
• Remedy: 1. Check the harness connection to front or rear air assist fan 4. 2. Replace front or rear air assist fan 4.

• Code: 541
• Description: Heating roller thermopile error The temperature measured by the thermopile does not reach 0°C for 10 seconds.
• Causes: • Loose connection of the thermopile • Defective thermopile
• Remedy: 1. Do SP5810 to cancel the SC fusing code. 2. Check if the thermopile is firmly connected. 3. Replace the thermopile.

• Code: 542
• Description: Heating roller warm-up error 1 • The center temperature of the heating roller does not reach the ready temperature for 830 seconds after the heating lamp on. • The center temperature of the heating roller does not reach 100°C for 400 seconds after the heating roller lamp on.
• Causes: Dirty or defective thermopile
• Remedy: 1. Do SP5810 to cancel the SC fusing code. 2. Check if the thermopile is firmly connected. 3. Replace the thermopile.

• Code: 543
• Description: Heating roller overheat 1 (software error) The detected fusing temperature (center) stays at 225°C for 10 seconds.
• Causes: • TRIAC short, AC drive board defective • Defective IOB 2 • Defective BCU • Related SC code: SC 553, SC563
• Remedy: 1. Do SP5810 to cancel the SC fusing code. 2. Replace the AC drive board. 3. Replace the IOB 2. 4. Replace the BCU.

• Code: 544
• Description: Heating roller thermopile (center) error 3 The thermopile detected a temperature over 260°C.
• Causes: • TRIAC short, AC drive board defective • Defective IOB 2 • Defective BCU • Related SC code: SC 553, SC563
• Remedy: 1. Do SP5810 to cancel the SC fusing code. 2. Replace the AC drive board. 3. Replace the IOB 2. 4. Replace the BCU.

• Code: 545
• Description: Heating roller fusing lamp on error After fusing belt reached warm-up temperature, the heating roller fusing lamp remained on for 360 sec. while the hot roller was not rotating.
• Causes: • Thermopile damaged, or out of position • Fusing lamp disconnected, broken
• Remedy: 1. Do SP5810 to cancel the SC fusing code. 2. Replace the thermopile.

• Code: 547
• Description: Zero cross error • The zero cross signal is detected once in the three zero cross signal detections even though the heater relay is off when turning on the main power. • The detection error occurs twice or more in the 10 zero cross signal detections. This error is defined when the detected zero cross signal is less than 44.
• Causes: • Defective fusing relay • Defective fusing relay circuit • Shorted +24V fuse on the PSU • Unstable power supply • Defective breaker or breaker off • Defective FIB (+6VGINT off) • Defective AC drive board (Defective power relay) • Defective IOB 2
• Remedy: 1. Check the power supply source. 2. Make sure that the breaker is turned on. 3. Replace the breaker if the breaker is not turned on. 4. Replace the FIB if +6VGINT (CN337-1 on IOB 2) is OFF. 5. Replace the AC drive board. 6. Replace the IOB 2. 7. Replace the +24V fuse on the PSU. 8. Replace the PSU