NEC NDA-24300 manual Tswm Accommodating Circuit Card Replacement Procedure

UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE

2. TSWM ACCOMMODATING CIRCUIT CARD REPLACEMENT PROCEDURE

This section explains the procedure for replacing circuit cards accommodated in the TSWM.

2.1Precaution

•This procedure is applied when replacing a faulty circuit card with a spare. It is also able to be applied when checking a spare card.

•There are the 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 PIM. When a circuit card that has default switch settings has been replaced with a spare card, be sure to make switch settings on the new circuit card the same as on the replaced card. Otherwise, elec- tronic components on the circuit card may be destroyed, or the circuit card itself may fail to function normally.

•When handling a circuit card, be sure to use the field service kit for countermeasures against static electricity. If you touch a circuit card without using the field service kit, electronic components like an IC on the card may be destroyed by the static electricity on the human body.

2.2Circuit Card Mounting Face Layout

The face layout of the circuit cards housed in the TSWM is shown in Figure 4-4 Circuit Card Mounting Face Layout of TSWM. Note that the circuit cards marked with * are optional.

TSWM

Slot No.

0	01	02	03	04	05	06	07	08	09	10	11	12	13		14	15	16	17	18	19	20		21	22		23
PWR SW0	PWRSW1	(RES)	MISC	MISC	MISC	MISC	MISC	DLKC0	DLKC1	GT0	GT1	TSW00	TSW01		TSW02	TSW03	TSW10	TSW11	TSW12	TSW13
																						PLO0			PLO1
			*	*	*	*	*																	(RES)
PWRSW: PH-PW14					DLKC: PH-PC20					GT: PH-GT09				TSW: PH-SW12					PLO: PH-CK16/17

Figure 4-14 Circuit Card Mounting Face Layout of TSWM

WARNING

Improper key operations may result in a system down. Operate the key, using extreme care.

By replacing a circuit card, the system will issue system messages and activate the related alarm. Be sure to reset the indicated alarm after the replacement procedure is complete.

If the indicated alarm is cleared via the RALM command, the system also clears the contents of the system mes- sage. Be sure to print out the messages (using the DFTD command) BEFORE using the RALM command.

The ALM RST button is used to reset the alarm lamps only.

CHAPTER 4 NDA-24300

Page 266

Issue 1