Lexmark X644E Service Manual - Page 178

7002-xxx Fuser solenoid service check 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: Try changing the envelope enhance level setting. A different setting may correct the problem. Note: Check the fuser envelope conditioner solenoid adjustment as described in the adjustment section "Fuser solenoid adjustment" on page 4-2. FRU 1 Fuser envelope conditioner solenoid Action Observe the operation of the fuser solenoid by removing the redrive assembly. Check for proper mechanical operation of the solenoid and associated hardware, link, and so on. If correct, check the resistance of the solenoid between J4-1 and J4-2 on the fuser control board. 2 System board 3 LVPS 4 Fuser board to system board cable 5 Fuser assembly The resistance measures between 5 ohms and 10 ohms. If incorrect, replace the fuser assembly. If correct, go to step 2. Measure the voltage at the +50 V dc test point on the system board. The voltage should measure approximately +50 V dc. If incorrect, go to step 3. If incorrect, go to step 4. Measure the voltage at CN2-18 on the LVPS. The voltage should measure approximately +50 V dc. If incorrect, replace the LVPS assembly. See "Low voltage power supply removal" on page 4-109. If correct, replace the system board. See "System board and inner shield removal-model X642e" on page 4-130 or "System board and inner shield removal -models X644e/ X646e" on page 4-131. Make sure the cable is connected properly to the system board and fuser control board. Reconnect the cable, if necessary. If the cable is connected correctly, go to step 5. If no problems were found in steps 1 through 4, replace the fuser assembly. See "Fuser assembly removal" on page 4-79. 2-140 Service Manual