Page: 76Service Guide OL400Chapter 4 Failure & Repair AnalysisRAP 01Printer Does Not InitializeSTARTTurn the power OFF, then ON.Is the WARMING UP message displayed?YES Go to BNO Check the AC cable connection.Verify that +5V output is generated. Check the connection at the main controller circuit boardCN1-1 (+5V) and CN1-3 (0V)YES Go to ANO Is the power fuse open?YES Check for shorts between AC and replace the fuseNO Is power generated when the engine controller circuit board is detached(from the power supply unit) and AC power is turned ON?YES Is there a short between +38V and 0V? Is there a short between+5V and 0V when the engine controller board is installed. (Make thischeck on the engine controller board.) Be sure that the circuit side of theengine controller board is not touching the shield frame.NO Replace the power supply unit.YES Install Engine Controller Board correctly.AIs the Block Character displayed on the operator panel 16 seconds after the power is turned ON?YES Replace the main controller circuit board or the engine controller circuit board.NO Is the operator panel cable disconnected?YES Connect the cable.NO Replace the operator panel board.
