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Type B Vital Relays - Alstom

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Troubleshooting<br />

Table 5–1. Troubleshooting Symbols<br />

Symbol<br />

Explanation<br />

Malfunction statement as derived from operator's report.<br />

Basic instruction for preparation of a test, procedure, or<br />

observation. The action taken results in a diagnostic<br />

decision.<br />

Result from previous action, which is answered yes or no. If<br />

result is within tolerance, answer yes. If not, answer no. Do<br />

not consider any gray areas between yes and no.<br />

Final step of instructions involving corrective measures.<br />

Reference publication indicates suspected problem area.<br />

Special instruction for continuation of troubleshooting<br />

diagram at referenced location.<br />

P1457, Rev. Nov/07 5–3 <strong>Alstom</strong> Signaling Inc.

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