Lexmark X644E Service Manual - Page 170
Fuser service checks, 920.xx-Cold fuser service check
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7002-xxx Fuser service checks 920.xx-Cold fuser service check Error codes 920.x and 922.xx may display for a cold fuser failure. Some 920.xx error codes may be cleared by turning the printer on and off and allowing it to complete POR. CAUTION There is a danger from hazardous voltage in the area of the product where you are working. Unplug the product before you begin, or use caution if the product must receive power in order to perform the task. Service tip: Some 920.xx errors can be caused by multiple sheets of paper being fed up to the fuser. Service tip: Set the Fuser Temperature to NORMAL before starting this service check. In Diagnostics mode, select EP SETUP, and Fuser Temp. Service tip: It may take several minutes for the error codes 920.xx and 922.xx to be displayed after the printer is turned on. FRU 1 Fuser lamp Fuser lamp AC cable 2 AC line voltage 3 LVPS Action Observe the lamp through the left near side of the printer. It may be necessary to remove the redrive assembly to observe the lamp turning on and off. If the lamp does not come on do the following: • If not previously removed, remove the redrive assembly. See "Redrive assembly removal" on page 4-128. • Remove the fuser assembly. See "Fuser assembly removal" on page 4-79. • Make sure the correct type of lamp is installed (voltage and wattage). • Verify that the fuser to fuser lamp cable is installed correctly to the fuser top cover assembly. If incorrect, install correctly; if correct, go to step 2. CAUTION: When taking measurements for AC power, observe all safety precautions. Check the AC line voltage to make sure it is within operating specification. If incorrect, inform the customer; if correct, go to step 3. CAUTION: When taking measurements for AC power, observe all safety precautions. Unplug the AC line cord from the printer and pull the LVPS out far enough to access CN1 on the LVPS board (see "Low voltage power supply removal" on page 4-109). Disconnect the LVPS to fuser AC cable, plug in the line cord, turn the printer on and measure the voltage between CN1-1 and CN1-3 on the connector (see the connector locations at "Low voltage power supply" on page 5-11). If incorrect, replace the LVPS assembly (see "Low voltage power supply removal" on page 4-109); if correct, go to step 4. 2-132 Service Manual