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Sheet C063CORRECTIVE MAINTENANCE SHEETCHANGING THE PRINTED CIRCUITFolio 1/13 241 - Preliminary operations• Put the machine in the maintenance configuration (see correspondingparagraph).• Switch off electric power (see corresponding paragraph).• Disconnect the « - » then « + » terminals of the starter battery.2 - Removing the printed circuit• Open the turntable electric box.• Carefully mark and disconnect all the electric connections (1) of the printedcircuit (2).• Remove the U1 electronic module (4) (see corresponding sheet)• Remove the bolts (3) fixing the board to the box and their sealing washers.• Remove the printed circuit and silent-blocks equipping the fixing bolts.13 - Installing the printed circuit• Put a new printed circuit into place and fix using the bolts equipped withsilent blocks, sealing rings and new toothed washers.• Install the U1 electronic module (see corresponding sheet).• Reconnect the electric connections according to the marks made duringdismantling.• Close the turntable box.• Reconnect the « + » then « - » terminals of the starter battery.• Put the machine back into the operational configuration.• Test the printed circuit.4 - Testing the printed circuit• Perform the computer operating test (see «changing the U1 electronicmodule» sheet).