• 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 POR the machine. Does the error continue? Replace the upper printer engine PCBA. Go to “Upper printer engine PCBA removal” . Problem resolved

• 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 Lower engine PCBA fuse 7 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

• Code: 191.11
• Description: Service engine error Lower engine PCBA fuse 7 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

• Code: 191.12
• Description: Service engine error Lower engine PCBA fuse 8 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: •MPF tray feeder motor. •Upper redrive motor. •Duplex 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