NEC NDA-24300 manual Tone Fault

10.2 Tone Fault

START

Replace the TSW circuit card with a spare and check.

When only Hold Tone is faulty

If External Hold Tone source is in use

Replace the EMA/PLO circuit card with a spare.

Note: When system is 1-IMG configuration, replace EMA card. Otherwise, replace PLO card.

WARNING If the EMA card is removed from the system while the

system is in operation under the control of the CPU #1, the system will reset and stop all call processing. Refer to Section 1.3.2, EMA Card Replacement Procedure, in Chapter 4, for detailed instructions.

END

FAULT REPAIR PROCEDURES

ATTENTION

Contents

Static Sensitive

Handling

Precautions Required

Check the external equipment which sends out hold tone.

Check cross connections on the MDF. Figure 5- 21 shows a block diagram of external hold tone supply (optional).

Set the MB switch of the EMA/PLO circuit card to UP side and extract the circuit card from its mounting slot.

Make necessary switch settings on the new circuit card, referring to the card extracted.

Set the MB switch of the new circuit card UP and insert the circuit card into its mounting slot.

Set the MB switch DOWN.

Initialize the system and confirm the tone.

NDA-24300CHAPTER 5

Page 377

Issue 1