NEC ND-71762(E) system manual Start

MAINTENANCE PROCEDURE

(5)Diagnostic Work

START

When lock up fault occurs only FAULT SUPERVISION once or twice.

If the lock up fault occurs sporadically; flip the MBR switch of the CCH circuit card to UP → DOWN.

When system message 13-E FAULT is displayed

￿

:CCH/CCT circuit card is faulty. Paragraphs 3.3 or 3.4

When system message 13-E FAULT SUPERVISION is not displayed

When the lock up fault occurs FAULT

cyclically￿￿

￿

:CCH/CCT circuit card is faulty. Paragraphs 3.3 or 3.4

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ND-71762 (E)CHAPTER 8

Page 99

Issue 2