
DOCUMENT 1025
REV. B
Instruction Manual
858 LED Series
Sizes 1, 2, 3, 4 and 5
10 Maintenance and Troubbleshooting
WARNING:
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 | Remove Po wer Before Attempting Any Servicing. | 
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10.1General
Work on electrical circuits should be done only by a qualified electrician with a working knowledge of airfield lighting circuits. 
It is also assumed that the circuit is in proper working order from the isolation transformer secondary connector 
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 | WARNING: | 
| NOTICE | 
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 | Only use O EM replacement sign legend panels. The entire message | 
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 | element mu st be replaced per FAA AC  | 
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 | proprietary process replacement panels meet the photommetric and | 
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 | wind loadinng requirements of the sign as certified to FAAA AC 150- | 
5345-44J. 
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