GSE 350IS / GSE 355IS Service Manual - Advanced Weigh ...

8 MaintenanceThe mainboard, keypad and display are the key components that may need to bereplaced. All service, component replacement and repairs must be performed byqualified personnel. Before opening the indicator, make sure that all power is removedand the repair is done in a safe area. If it is necessary to replace the keypad or display,you must first remove the main board. Follow the instructions below to remove andreinstall the main board.8.1 Main Board ReplacementIt is possible that the main board may need to be replaced for a number of variousreasons. Please consult with a factory representative before removing the main board.8.1.1 Main Board Removal1. Remove the eight Phillips head screws from the back panel.2. Separate the back panel from the front enclosure and set the back panel andscrews aside. When the back panel is removed the main board will be visible.3. Disconnect the wires for the loadcell (J10), power (J14) and communications(J8) (if used). Unplug the keypad ribbon cable from J16.4. Remove the four lock nuts from the main board with a 7 mm nut driver.5. Carefully remove the main board from the enclosure. If the keypad or displayneed to be replaced, follow the instructions for that component.8.1.2 Main Board Installation1. Place the main board over the studs on the enclosure. Make sure the powerconnector (J14) is towards the bottom of the enclosure.2. Connect the keypad cable.3. Fasten the main board to the enclosure with four lock nuts. Be sure not to overtighten.4. Reinstall the back panel with two tamper proof Phillips head screws and sixPhillips head screws. Be sure not to over tighten.8.2 Keypad ReplacementIf the keypad needs to be replaced due to damage or malfunction, follow the stepsbelow to remove the inoperative keypad and replace it with a new one. The main boardmust be removed to access the keypad.Model 350 I.S. and Model 355 I.S. Service Manual 137