TM 9-2320-365-34-1Section III. TROUBLESHOOTING2-7. INTRODUCTION TO LOGIC TREE TROUBLESHOOTINGThis section contains step-by-step procedures for identifying, locating, isolating, and repairing equipmentmalfunctions.This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If amalfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.2-8. TROUBLESHOOTING INSTRUCTIONSa. Page Layout. Troubleshooting procedures are divided into logic tree pages and test pages.(1) A logic tree page is always a left-hand page, facing the test page on the right. The logic tree pageprovides the sequence of steps required to isolate a fault to a failed component. All critical informationfor decision making is on the left-hand page. Each logic tree page contains the following information:(a) INITIAL SETUP - This box is located only on the first logic tree page of a fault. INITIAL SETUP liststools, materials, references, personnel, and equipment needed to troubleshoot the fault.(b) KNOWN INFO - This box is located in the top left-hand column. KNOWN INFO lists conditions andinformation that will eliminate specific components as the cause of the fault.(c) POSSIBLE PROBLEMS - This box is located directly below KNOWN INFO. All of the systemcomponents that could cause a fault are listed in the POSSIBLE PROBLEMS box. The firstcomponent listed in the POSSIBLE PROBLEMS box is the one that will be tested at that step in thelogic sequence. When one of the components is tested and found to be operational, it is entered atthe bottom of the KNOWN INFO box as OK.(d) QUESTION - Each question, located in the middle column, refers to the first possible problem listedin POSSIBLE PROBLEMS. If the answer to the question is YES, proceed to the next step. If theanswer is NO, follow the NO arrow to obtain directions for correcting the problem. If the stepcontains a WARNING or CAUTION message, a small shadow box is printed above the question.Text for WARNINGs or CAUTIONs is on the following right-hand page.(e) TEST OPTIONS - This box is located in the top right-hand column. TEST OPTIONS lists testsavailable for testing parts suspected of failing.(f) REASON FOR QUESTION - This box is located directly below TEST OPTIONS. It explains thepurpose for the question in the middle column.(2) A test page is always a right-hand page, facing the logic tree page on the left. The test providesdetailed instructions for testing the first component listed in the POSSIBLE PROBLEMS box. This testwill also provide an answer for the question in the middle column. Note the arrow connecting the teston the right-hand page to the REASON FOR QUESTION. When possible, illustrations are included toprovide visual details. Notes contain additional information for testing.2-6ChangeChange 11
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