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INTERCOM SYSTEM
TOA EXES-5OOO
INTERCOM SYSTEM
TROUBLE SHOOTING GUIDE
TOA ELECTRIC CO., LTD.
KOBE, JAPAN
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8. TROUBLE SHOOTING GUIDE Repairing of the EXES-5000 system is basically done by replacing defective units with good ones. The system's faults in an installation can be divided into the fol- lowing categories. 1. Faults in an exchange 2. Faults in a station 3. Cable faults To make system repairing easier, find which category is involved, then refer to the chart below for assistance in fault finding. All stations do not operate. Fault in specific station Same symptom in every station. only. Fault
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EXES-5000 SYSTEM CHECK FLOW CHART START Table 1: DIP switch on CPU Set DIP switch correctly set ? according to Inst. P54 Fig. 1 Back-up battery on Plug the Jack into CPU connected ? Pin A. P56 Fig. 2 Program switch on Program switch off CPU off ? Power switch on Proper voltages at Disconnect DC power If +24V or +18V is not each output power connection and check in the range, check terminal? (tabl 1) power supply (DS-510). If +12V or +5V is not in the range, replace No.15 of SCN SELECT on OCU lit
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8-1. FAULT IN EXCHANGE Before power supply check, confirm the following three points to eliminate elementary faults: 1. Is voltage selector set correctly? 2. Is AC power supplied? 3. Is power switch ON? Start checking after disconnecting all wiring connected to DC output of the power supply unit. SYMPTON CHECK-ITEM Exchange does not All DC output Over-current flows into one operate. voltages are of plug-in units. correct. All or one of Fault in the power supply DC output unit DS-510. voltages ar
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8-2. HOW TO FIND SHORT BETWEEN T-LINE AND R-LINE If the shorted condition between T-line and R-line is not corrected for a long time, it may burn out the guard re- sistor (330 , 1/2W) on the LMU board. Therefore, find the shorted line according to the following procedure: 1. Turn off the privacy switch on all stations in the system. 2. Turn on the power switch of the system for several seconds, then, turn it off. 3. Watch the lamps on the LMU panels. The lamps on normal lines will go off after a
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1. One of transmitting lines (T-Line) is disconnected. Station EXCHANGE Symptom 1-1 A can make dialing. 1-2 A can hear B . 1-3 B can not hear A . 1-4 Noise is heard at B . 1-5 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. EXCHANGE 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 -64-
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3. T-Line and R-Line are shorted or mixed up. Shorted or mixed up EXCHANGE Symptom A can not dial. 3-1 3-2 Conversation is impossible between stations. 3-3 When B dials A , noise will be heard at B immediately after the calling tone. LMU Lamps Brighter than normal. 4. T-Line and R-Line are connected conversely. A can not make dialing. Sympton: 4-1 4-2 Conversation is impossible between stations. When B dials A , noise will be heard at B . 4-3 Brighter than normal. LMU Lamps -65-
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8-3. FAULT IN SPECIFIC STATION ONLY Find the cause according to the following table if the fault lies with a specific station only, not with all stations. CHECK-ITEM CAUSE Dialing can not LMU Lamp is Disconnection of both T & R-Lines. off. Guard resistor 330 on LMU is be made at privacy off mode. burned out due to T & R-Lines short. Specific Lamp T & R-Lines are shorted. on LMU is brighter than normal. Fault in the station. LMU Lamp is (Replace PCB board.) on in normal. Specific key does Replace
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Sound of the other Same symptom Adjust the volume control of party is broken remains even station speaker if the room during call. the station produces reverberation. is replaced. (Lower the volume.) Increase the gain of MIC AMP. Replace PCB after checking if MIC unit is not touching its case. Immediately after Same symptom One of R-Lines is disconnected. the calling tone, remains even Fault in photo coupler PC-504 the station on LMU. the line switches Fault in MT-547 on LMU or in to cancel, bus
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8-4. SPEECH AND FUNCTION TEST 1. Speech Test After completing the wiring check and the power supply and exchange test according to the system flow chart, the speech test for each station can then take place. IMPORTANT NOTE Before testing, all programming (Secretary transfer, Master/Substation, Executive Priority Function) must be cleared from station No.200 by turning on the PRO- GRAM switch of the CPU, or the speech test can not proceed correctly. Call every station one by one from any master s
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2. Function Test Check all employed functions with a few stations near the exchange. Check "User Programmable Functions" at stations in- volved after the programming from station 200. Secretary Transfer: Is transfer made correctly with the privacy switch on at the executive station. Master/Substation : Touch dial at substation can call its master station. Executive Priority: Is this function operated at stations involved. Use all number keys including and , Press- To-Talk bar, Vol. L/H and priva
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MEMO
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MEMO
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TOA ELECTRIC CO., LTD. KOBE, JAPAN Printed in Japan EX5(7)-01R(79-2)
