NEC NDA-24300 manual Unit/Circuit Card Replacement Procedure, Precaution

CHAPTER 4 Unit/Circuit Card Replacement Procedure

1.LPM Accommodating Unit/Circuit Card Replacement Procedure

This section explains how to replace unit/circuit cards mounted in the LPM.

1.1Precaution

•Use this procedure to replace a faulty unit/circuit card with a spare or to check a spare card.

•There are functional switches (having set the default switch) on some of the circuit cards to be replaced. As for switch setting on the circuit cards, confirm the circuit card mounting face layout for the LPM. When a circuit card with a default switch setting is replaced with a spare card, always make the switch setting on the new circuit card the same as on the replaced card. Otherwise, electronic components on the circuit card may be destroyed, or the circuit card itself may fail to function normally.

•When handling a circuit card, always use the field service kit for countermeasures against static elec- tricity. Touching a circuit card without using the field service kit may destroy the card due to static elec- tricity on the human body.

1.2Circuit Card Mounting Face Layout

Figure 4-1shows the face layout of circuit cards mounted in the LPM. The circuit cards marked with * are optional.

NDA-24300CHAPTER 4

Page 239

Issue 1