User's Manual

NDA-24300 CHAPTER 4

Page 259

Issue 1

UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE

Replacement Procedure

Before replacing the EMA card, check the CPU #0’s ACT mode. Attempting to replace the card

when the CPU is active will result in the system being initialized.

WARNING

• Check the CPU OPE lamp of DSP

#1. When the lamp is steady-green,

perform the system changeover.

• OPE/MB lamp on the EMA card

lights red from green.

• When NCU (PA-M53) cards are

mounted, Power Failure Transfer

(PFT) is activated.

Turn ON the MB key on the EMA (PH-PC40) card.

Turn ON the MBR key on the DSP #1.

(System Changeover of CPU #1: ACT STBY)

Extract the EMA card from the LPM.

CPU is Active?

YES