Lexmark 2070 Color Jetprinter Service Manual - Page 22
Parallel Port Service Check, Power Service Check, Parallel Cable
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4090-001 Parallel Port Service Check FRU 1 Parallel Port Action Run a test page to be sure the printer can print. Run the 'Parallel Port Test' on page 3-5. If the test fails, replace the system board. Power Service Check FRU 1 Power Supply Action Disconnect J3 from the system board and check the following voltages on the power supply cable: • J3-1 to GND = +5 V dc • J3-3 to GND = +30 V dc • J3-5 to GND = +13.5 V dc • J3-6 to GND = +5 V dc • J3-8 to GND = +5 V dc 3 Printhead Cable Parallel Cable Encoder Card 4 System Board If you do not have correct voltage, replace the power supply. Be sure to unplug the printer before you reconnect the power supply to the system board. Turn off the printer. Disconnect one of the printhead cables and turn on the printer. Look for a symptom change. Check the failing part for shorts and replace as necessary. Repeat this procedure for the parallel cable and the encoder card. If the symptom has not changed, replace the system board. 2-11