TU81/TA81 Pathfinder

This document serves as a guide for field service representatives to troubleshoot and perform diagnostic tests on the TU81/TA81 Subsystem. It covers:

• Troubleshooting: Procedures for pre-site and on-site analysis, including a troubleshooting flowchart, a malfunction/failing assembly matrix, and a fault code matrix for Operator Test 01.
• Diagnostic Tests: Detailed descriptions of diagnostic tests (both operator-initiated and field service), including test requirements, sequences, and interpretation of fault and sub-fault codes.
• Specific Procedures: Step-by-step instructions for power-on checkouts (1001, 1002, 1003) and specific fault code troubleshooting procedures.