Lexmark C750 Service Manual - Page 147

5060-00x DC power service check The machine is partially operative, a motor turns, display is on or the power-on LED may be on or off. Step 1 Actions and questions Does the printer beep 5 times and the operator panel display all diamonds? Yes Go to "Operator panel LCD/status LED/buttons service check" on page 2-132. Go to step 3 No Go to step 2 2 DC power to engine board-turn the power off and disconnect the LVPS cable to J9 on the engine board. Turn the power on and check the following voltages on the LVPS cable. J9-1 J9-2 J9-3 J9-4 J9-5 J9-6 J9-7 J9-8 J9-9 J9-10 +3.3 V dc +5 V dc +5 V dc +24 V dc +24 V dc Ground Ground Ground Ground Ground Replace the LVPS. See "Low voltage power supply (LVPS) removal" on page 4-38. Note: All voltages are approximate values. Are the voltages correct? 3 DC voltages at RIP board-turn the power off and disconnect the LVPS cable to J23 on the RIP board. Turn the power supply assembly power on and check the following voltages on the LVPS cable: J23-1 J23-2 J23-3 J23-4 J23-5 J23-6 J23-7 J23-8 J23-9 J23-10 J23-11 J23-12 J23-13 J23-14 J23-15 J23-16 +3.3 V dc +3.3 V dc +3.3 V dc +5.0 V dc +5.0 V dc +5.0 V dc +24 V dc Ground Ground Ground Ground Ground Ground Ground Ground Go to step 4 Replace the LVPS. See "Low voltage power supply (LVPS) removal" on page 4-38. Note: All voltages are approximate values. Are the voltages correct? Diagnostic information 2-113