Lexmark C520 Service Manual - Page 66

5022-xxx Models C53x only Step Questions / actions 1 Has the printhead been recently replaced? Yes Replace the printhead with a new, and not previously installed smart chip card. See "Printhead removal" on page 4-74. No Replace the system card with a new, and not previously installed system card. See "System card removal" on page 4-79. Dead printer service check A dead printer is a condition where the display is blank, the LED on the operator panel is off, no fans turn, no motors turn, and the fuser lamp does not come on. If a 500-sheet option assembly (C52x models) or a 550-sheet option assembly (C53x models) is installed, remove the option and check the base printer for correct operation. If the base printer operates correctly, replace the 500-sheet option assembly. Warning: Observe all necessary ESD precautions when removing and handling the system card or any installed option cards or assemblies. See "Handling ESD-sensitive parts" on page 4-1. CAUTION When you see this symbol, 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. Remove any input and output paper handling options from the printer. Step Questions / actions 1 Check the AC line voltage. Is the line voltage correct? 2 Is the AC line cord damaged? 3 Check the system card for +5 V dc between JLVPS1 pin 1 and ground. Is the voltage correct? 4 Is the JLVPS1 cable correctly installed at JLVPS1 on the system card? 5 Turn the printer off. Disconnect the JLVPS1 cable from the system card. Turn the printer on, and measure the voltage between the JLVPS1 cable pin 1 and the JLVPS1 pin 14 (black wire). Does this measure approximately +5 V dc? Yes Go to step 2. Replace the line cord. Replace the system card. See "System card removal" on page 4-79. Go to step 5. Go to step 6. No Inform the customer. Go to step 3. Go to step 4. Reseat the JLVPS1 cable. Replace the LVPS. See "Low voltage power supply (LVPS) removal" on page 4-65. Diagnostic information 2-51