• Code: 920.25
• Description: POST Error
  Bad temperature and humidity sensor.
• Remedy: 1 Open the front access door. Reseat the transport cable. Does the error clear? Problem resolved. Go to step 2.
  2 Turn the printer off, and then remove the rear frame cover. See “Rear frame cover removal”. Reseat the transport cable in connector JTPS1 (A). Does the error clear? Problem resolved. Go to step 3.
  3 Check the transport cable in connector JTPS1 for pinch points and for any other damage to the cable or connector. Is the cable damaged? Replace the transport cable. See “Transport cable removal”. Go to step 4.
  4 Check the continuity at JTPS1, pins 1–10). Is there continuity? Go to step 5. Replace the cartridge motor1/fuser motor cable. See “Cartridge motor 1/ fuser cable removal”.
  5 Replace the transport belt assembly. See “Transfer module removal”. Does the error clear? Problem resolved. Replace the system board. See “System board removal”.

• Code: 920.27
• Description: POST Error
  Option board ID unknown.
• Remedy: 1 Is the specified option the 550-sheet tray? Replace the 550-sheet tray with a new 550-sheet tray option. Go to step 2.
  2 Is the specified option the special media tray? Replace the special media tray with a new special tray option. Go to step 3.
  3 Is the specified option the high-capacity input tray (HCIT)? Replace the HCIT controller board assembly. See “HCIT controller board assembly removal”.

• Code: 920.28
• Description: POST Error
  Option type unknown.
• Remedy: 1 Is the specified option the 550-sheet tray? Replace the 550-sheet tray with a new 550-sheet tray option. Go to step 2.
  2 Is the specified option the special media tray? Replace the special media tray with a new special tray option. Go to step 3.
  3 Is the specified option the high-capacity input tray (HCIT)? Replace the HCIT controller board assembly. See “HCIT controller board assembly removal”.

• Code: 920.29
• Description: POST Error
  Option product ID unknown.
• Remedy: 1 Is the specified option the 550-sheet tray? Replace the 550-sheet tray with a new 550-sheet tray option. Go to step 2.
  2 Is the specified option the special media tray? Replace the special media tray with a new special tray option. Go to step 3.
  3 Is the specified option the high-capacity input tray (HCIT)? Replace the HCIT controller board assembly. See “HCIT controller board assembly removal”.

• Code: 920.30
• Description: POST Error
  Option sensor disconnected.
• Remedy: Use the following list to determine which service check to use: • Tray 2—Go to “242.02—Paper Jam service check”. • Tray 3—Go to “243.02—Paper Jam service check”. • Tray 4—Go to “244.02—Paper Jam service check”. • Tray 5—Go to “245.02—Paper Jam service check”.

• Code: 920.31
• Description: POST Error
  Option hardware error (generic)
• Remedy: Contact your next level of support.

• Code: 925.01
• Description: Fan Error
  Fan has stalled.
• Remedy: 1 Turn the printer off, and then remove the rear frame cover. See “Rear frame cover removal”. Check the cable in connector JFAN1 (A) for proper connection to the system board, for pinch points, and for any other damage to the cable or the connector. Is the cable damaged? Replace the fan. See “Cooling fan removal”. Go to step 2.
  2 Measure the resistance across fuse F5 on the system board. Is the fuse blown? Replace the system board. See “System board removal”. Go to step 3.
  3 1. Disconnect the cable in connector JFAN1, and connect a new fan. 2. Bring the printer up in Diagnostic menu (turn off the printer, press and hold and . and turn on the printer). Did the error clear? Replace the cooling fan. See “Cooling fan removal”. Replace the system board. See “System board removal”.

• Code: 925.02
• Description: Blower Error
  Blower has stalled.
• Remedy: 1 Turn the printer off, and remove the rear frame cover. See “Rear frame cover removal”. Check the cable in connector JBLW1 (A) for proper connection to the system board, for pinch points, and any other damage to the cable or connector. Is the cable damaged? Replace the blower. See “Cartridge cooling fan removal”. Go to step 2.
  2 Measure the resistance across fuse F5 (A) on the system board. Is the fuse blown? Replace the system board. See “System board removal”. Go to step 3.
  3 Disconnect the cable in connector JBLW1, and connect a new cartridge cooling fan. Bring up the printer in Diagnostic menu Did the error clear? Replace the cartridge cooling fan. See “Cartridge cooling fan removal”. Replace the system board. See “System board removal”.