• Code: 175.08
• Description: Service engine error Rear left upper cooling fan failure The rear left upper cooling fan is not functioning.
• Remedy: 1 Check the upper exhaust fan. Is the above component properly connected? Go to step 2. Replace the connections. 2 Replace the upper exhaust fan. Go to “Upper exhaust cooling fan removal”. Does the error continue? Go to step 3. Problem resolved 3 POR the machine. Does the error continue? Replace the upper printer engine PCBA. Go to “Upper printer engine PCBA removal”. Problem resolved

• Code: 191.01
• Description: Service engine error Lower engine PCBA detect failure The lower engine PCBA is not detected.
• Remedy: 1 POR the machine. Does the error remain? Go to step 2. Problem resolved 2 Check the lower engine PCBA. Is the above component properly connected? Replace the lower engine PCBA. Go to “Lower engine PCBA removal”. Go to step 2. Replace the connections. 3 POR the machine. Does the error continue? Replace the upper printer engine PCBA. Go to “Upper printer engine PCBA removal”. Problem resolved

• Code: 191.02 ... 191.05
• Description: Service engine error Fuse on the upper engine PCBA has blown.
• Remedy: 1 POR the machine. Does the error remain? Go to step 2. Problem resolved 2 Check the upper engine PCBA. Is the above component properly connected? Replace the upper engine PCBA. Go to “Lower engine PCBA removal”. Replace the connections.

• Code: 191.06
• Description: Service engine error Fuse 2 on the lower engine PCBA has blown.
• Remedy: 1 Warning: Remove the cause of blown fuse before replacing the lower engine PCBA. Check the following parts circuits for overcurrent and overvoltage. • LED printhead (Y, M, C, K) • Printhead interface contact (Y, M, C, K) Are the current and voltage values normal? Go to step 2. Replace the faulty parts. 2 POR the machine. Does the error continue? Replace the lower engine PCBA. Go to “Lower engine PCBA removal”. Problem resolved

• Code: 191.08
• Description: Service engine error Fuse 4 on the lower engine PCBA has blown.
• Remedy: 1 Warning: Remove the cause of blown fuse before replacing the lower engine PCBA. Check the following parts circuits for overcurrent and overvoltage: • Tray module controller PCBA • HCF Are the current and voltage values normal? Go to step 2. Replace the faulty parts, or repair the circuits. 2 POR the machine. Does the error continue? Replace the lower engine PCBA. Go to “Lower engine PCBA removal”. Problem resolved

• Code: 191.09
• Description: Service engine error Fuse 5 on the lower engine PCBA has blown.
• Remedy: 1 Warning: Remove the cause of blown fuse before replacing the lower engine PCBA. Check the finisher circuit for overcurrent and overvoltage. Are the current and voltage values normal? Go to step 2. Replace the faulty parts, or repair the circuits. 2 POR the machine. Does the error continue? Replace the lower engine PCBA. Go to “Lower engine PCBA removal”. Problem resolved

• Code: 191.10
• Description: Service engine error Fuse 6 on the lower engine PCBA has blown.
• Remedy: 1 Warning: Remove the cause of blown fuse before replacing the lower engine PCBA. Check the following parts circuits for overcurrent and overvoltage: • Media transport/MPF drive motor • Media feed lift motor • Fuser pressure roll retract motor • Waste toner agitator motor Are the current and voltage values normal? Go to step 2. Replace the faulty parts, or repair the circuits. 2 POR the machine. Does the error continue? Replace the lower engine PCBA. Go to “Lower engine PCBA removal”. Problem resolved

• Code: 191.11
• Description: Service engine error Fuse 7 on the lower engine PCBA has blown. A fuse has blown.
• Remedy: 1 Warning: Remove the cause of blown fuse before replacing the lower engine PCBA. Check the following parts circuits for overcurrent and overvoltage: • Fuser cooling fan • LVPS cooling fan • Rear left exhaust fan • Rear upper cooling fan • Front right cooling fan Are the current and voltage values normal? Go to step 2. Replace the faulty parts, or repair the circuits. 2 POR the machine. Does the error continue? Replace the lower engine PCBA. Go to “Lower engine PCBA removal”. Problem resolved