DISPLAY STATE DOES NOT CHANGE WHEN MENU SELECTION SWITCH IS PRESSED

DISPLAY COMES ON BUT HAS SCRAMBLED OR NO CHARACTERS -- Continued

TM-10-3510-221-24
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TM 10--3510--221--24 0019 00--1/2 blank DISPLAY STATE DOES NOT CHANGE WHEN MENU SELECTION SWITCH IS PRESSED 0019 00 THIS WORK PACKAGE COVERS: Troubleshooting Display State Does Not Change When Menu Selection Switch Is Pressed Fault INITIAL SETUP: Maintenance Level Materials/Parts Unit Tools and Special Tools Equipment Conditions Tool Kit, General Mechanics (Item 1, WP 0272 00) Power must be applied at main control Multimeter (Item 2, WP 0272 00) enclosure (WP 0010 00). 1. Press menu selection switch while monitoring display status. Does display state change to selected option? YES Return to normal operation. NO Go to step 2. 2. Position SW2 to OFF. 3. Open door on operator panel. 4. Remove wires connected to suspect pushbutton switch (+) and (--) terminals. 5. Press switch, then check for continuity across (+) and (--) terminals. Does continuity exist? YES Go to step 6. NO Replace pushbutton switch (WP 0242 00). 6. Check wire connections between pushbutton switch and TB2 COM. Are connections OK? YES Go to TYPICAL DISCRETE INPUT SIGNAL FAULT (WP 0107 00) to check operation of menu selection switch. NO Repair as necessary. END OF WORK PACKAGE

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