• Code: 7224
• Description: Broken LSU thermistor Y wire
  The sensor input sampling is greater than 230.
• Remedy: LSU thermistor Y: 1. Confirm LSU is displayed by U139 temperature and humidity. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Laser scanner unit and LSU relay PWB (YC12) LSU relay PWB (YC3) and Engine PWB (YC12) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the laser scanner unit.
  LSU relay PWB: REPLACE the LSU relay PWB.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 7231
• Description: Short-circuited LSU thermistor K
  The sensor input sampling is less than 69.
• Remedy: LSU thermistor K: 1. Confirm LSU is displayed by U139 temperature and humidity . 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Laser scanner unit and LSU relay PWB (YC5) LSU relay PWB (YC3) and Engine PWB (YC12) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the laser scanner unit.
  LSU relay PWB: Replace the LSU relay PWB.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 7232
• Description: Short-circuited LSU thermistor C
  The sensor input sampling is less than 69.
• Remedy: LSU thermistor C: 1. Confirm LSU is displayed by U139 temperature and humidity. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Laser scanner unit and LSU relay PWB (YC10) LSU relay PWB (YC3) and Engine PWB (YC12) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the laser scanner unit.
  LSU relay PWB: REPLACE the LSU relay PWB.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 7233
• Description: Short-circuited LSU thermistor M
  The sensor input sampling is less than 69.
• Remedy: LSU thermistor M: 1. Confirm LSU is displayed by U139 temperature and humidity. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Laser scanner unit and LSU relay PWB (YC8) LSU relay PWB (YC3) and Engine PWB (YC12) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the laser scanner unit.
  LSU relay PWB: REPLACE the LSU relay PWB.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 7234
• Description: Short-circuited LSU thermistor Y
  The sensor input sampling is less than 69.
• Remedy: LSU thermistor Y: 1. Confirm LSU is displayed by U139 temperature and humidity. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Laser scanner unit and LSU relay PWB (YC12) LSU relay PWB (YC3) and Engine PWB (YC12) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the laser scanner unit.
  LSU relay PWB: REPLACE the LSU relay PWB.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 7241
• Description: Broken developer thermistor K wire
  The sensor input sampling is greater than 230.
• Remedy: Developer thermistor K: 1. Confirm Developing is displayed by U139 temperature and humidity. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Developer unit K and Front PWB (YC9) Front PWB (YC2) and Engine PWB (YC10) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the Developer unit K.
  Front PWB: Replace the front PWB.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 7242
• Description: Broken developer thermistor C wire
  The sensor input sampling is greater than 230.
• Remedy: Developer thermistor C: 1. Confirm Developing is displayed by U139 temperature and humidity. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Developer unit C and Front PWB (YC13) Front PWB (YC2) and Engine PWB (YC10) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the Developer unit C.
  Front PWB: Replace the front PWB.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 7243
• Description: Broken developer thermistor M wire
  The sensor input sampling is greater than 230.
• Remedy: Developer thermistor M: 1. Confirm Developing is displayed by U139 temperature and humidity . 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Developer unit M and Front PWB (YC11) Front PWB (YC2) and Engine PWB (YC10) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the Developer unit M.
  Front PWB: Replace the front PWB.
  Engine PWB: 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.