Lexmark 4227 Service Manual - Page 49
Power failure service check, Diagnostic information, For more information see
UPC - 734646117104
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4227-300 Power failure service check For more information see "Voltage, ground, and continuity readings" on page 1-2. FRU 1 Operator Panel 2 Power Supply Fuse Action If the operator panel or cable is damaged or disconnected, the machine is completely inoperable, except for the power supply fan noise. If the power LED is not on steady, check the cable continuity and replace the cable or the operator panel. If the printer is completely inoperable, disconnect the power cables from the main logic board (CN11) and the sub logic board (CN1). Turn the power on and measure +5 ± 0.5 V dc at the sub logic board cable CN1-5 and +40 ± 4 V dc at CN1-1 and CN1-2. If there is no voltage, check the internal fuse before replacing the power supply. A 634 Power Failure indicates that the +5 V dc is OK but the +40 V dc is not. Power the printer off, wait 10 seconds, and power back on. If the 634 reappears either the power supply has failed or there is a short in a motor that uses +40 V dc. Diagnostic information 2-25