• Code: 927.16
• Description: Print cartridge cooling fan over speed failure. The Print cartridge cooling fan does not reach the specified speed.
• Remedy: 1. Check for cooling fan obstructions. 2. Check the connections on the main cooling fan. 3. Replace the print cartridge cooling fan.

• Code: 927.17
• Description: Print cartridge cooling fan over speed failure. The Print cartridge cooling fan does not reach the specified speed.
• Remedy: 1. Check for cooling fan obstructions. 2. Check the connections on the main cooling fan. 3. Replace the print cartridge cooling fan

• Code: 927.21
• Description: LVPS cooling fan failure. LVPS cooling fan is obstructed or has failed.
• Remedy: 1. Check for cooling fan obstructions. 2. Check the connections on the main cooling fan. 3. Replace the LVPS cooling fan

• Code: 929.01 ... 929.03
• Description: Sensor (toner empty) sensor failure. The sensor (toner empty) does not provide toner level feedback or the print cartridge is damaged.
• Remedy: 1. Check the toner pulse wheel on the print cartridge for damage and replace the print cartridge if needed. 2. Check the sensor (toner empty) for proper operation.
  1 Check the media path. Is the media path free of media or media fragments? Go to step 2. Remove any media or media fragments. 2 Check the sensor (ADF sheet through) for proper operation. 1. Enter the Diagnostics Menu. 2. Touch SCANNER TESTS. 3. Touch Sensor Tests. 4. Observe the line “sensor (ADF sheet through”. Does the display on the operator panel, change every time the sensing area of the above sensor is interrupted or blocked? Go to step 4. Go to step 3. 3 Check the sensor (ADF sheet through) for proper connection. Is the above component properly connected? Replace the sensor (ADF sheet through). Go to “Sensor (ADF sheet through) removal (models X651, X652, X654, X656, and X658)”. Replace the connection. 4 Place an undamaged document in the ADF, and perform a ADF test. Does the error remain? Replace the ADF controller card assembly. Go to “ADF controller card removal (models X651, X652, X654, X656, and X658)”. Go to step 5. Problem solved. 5 Perform a print test using the ADF. Does the problem remain? Contact next highest level of tech support. Problem solved.

• Code: 930.00 ... 933.00
• Description: 930.00 Incorrect printhead or intermittent Hsync A non supported printhead is installed. Hsync signal is intermittent or noisy. Printhead ID resistor circuit is not to spec. 931.00 No first laser H sync The hsync signal is missing or not at the correct voltage. 932.00 Printhead lost laser H syncs. The hsync signal is missing or not at the correct voltage. 933.00 Polygon mirror motor locked. No first laser H sync received. The hsync signal is missing or not at the correct voltage.
• Remedy: Replace the printhead assembly.

• Code: 934.00
• Description: Mirror motor lost lock. The signals driving the polygon motor may have been corrupted, or the cable may be loose, or the motor may be bad.
• Remedy: 1. Check all connections on the printhead assembly. 2. Check all connections on the system card assembly. 3. Replace the printhead assembly.

• Code: 935.00
• Description: Polygon mirror motor control failure. The signals driving the polygon mirror motor may have been corrupted, or the cable may be loose, or the motor may be bad.
• Remedy: 1. Check all connections on the printhead assembly. 2. Check all connections on the system card assembly. 3. Replace the printhead assembly.

• Code: 936.11 ... 936.90
• Description: 936.11 Main drive motor assembly failure No halls detected at motor start. Motor = type 1 936.20 Main drive motor assembly failure Failed to stop within timeout. Motor = type 0 936.21 Main drive motor assembly failure Failed to stop within timeout. Motor = type 1 936.30 Main drive motor assembly failure No lock detected at motor start for motor ID. Motor = type 0 936.31 Main drive motor assembly failure No lock detected at motor start for motor ID. Motor = type 1 936.60 Main drive motor assembly failure No lock detected at normal motor start. Motor = type 0 936.61 Main drive motor assembly failure No lock detected at normal motor start. Motor = type 1 936.90 Main drive motor assembly failure Stall detected during speed control. Motor = type 0 936.91 Main drive motor assembly failure Stall detected during speed control. Motor = type 1
• Remedy: 1. Check all connections on the system card assembly. 2. Check all connections on the main drive motor assembly. 3. Replace the main drive motor assembly. Go to “Main drive motor assembly removal (X651, X652, X654, X656, and X658)”. 4. Replace the system card assembly if problem remains. Go to “System card assembly removal (X651, X652, X654, X656, and X658)”.