TOA Electronics TOAEXES-5OOO 1-1

1. One of transmitting lines (T-Line) is disconnected.

Sympton: 2-1 A can make dialing without dialing tone.

2-2 When B dials A , busy tone or dial tone will be

heard at B immediately after the calling tone.

LMU Lamps ----- Normal

Station

EXCHANGE

Symptom

1-1

1-2

1-3

1-4

1-5

A can make dialing.

A can hear B .

B can n ot hear A .

Noise is heard at B .

Noise increases at B when Press-To-Talk bar is

pressed at A .

LMU Lamps Normal

2. One of receiving lines (R-Line) is disconnected.

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Contents

Main , CPU off ? -61- on HCU li t as Fig. 1 CPU- P54 P56 Before power supply check, confirm the following three 1. Is voltage selector set correctly? 2. Is AC power supplied? 3. Is power switch O N ? Start checking after disconnecting all wiring connected to DC output of the power supply unit. Faulty power transformer. 1. Turn off the privacy switch on all stations in the 1-1 1-2 1-3 1-4 1-5 Page 8-3. FAULT IN SPECIFIC STATION ONLY Find the cause according to the following table if the fault party. lies with a specific station only, not with all stations. be made at privacy Specific Lamp Fault in photo coupler PC-504 the speech test for each station can then take place. The sound volume can be adjusted by the volume on the The Press-To-Talk bar on the station keyboard must be in high noise areas (more than 60dB noise). tone quality, etc.) must be tested with each line in Secretary Transfer: Is transfer made correctly sure that the switch works.