Assessments - 3, GPA: 4
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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 in an exchange. Cable fault. Fault in a station. Power supply Mis-wiring between exchange Plug-in unit and terminal board. (Common control) Mis-wiring such as short, Back wiring on broken wire, etc. frame Misconnection in station jack. Key board switch fault. Board assembling fault. Speaker, microphone fault. Microswitch, connecting cable fault. -60 EXES-5000 SYSTEM CHECK FLOW CHART START DIP switch on CPU Set DIP switch correctly set ? according to Inst. P54 Back-up battery on Plug the Jack into CPU connected ? Pin A. P56 Program switch on Program switch off CPU off ? Power switch on Proper voltages at Disconnect DC power each output power connection and check terminal? (tabl 1) No.15 of SCN SELECT on OCU lit brighter than Replace CPU others ? CLOCK lamp on HCU lit Replace HCU brightly ? Other lamps on HCU off ? Replace HCU OCU CPU Station No. lamp on LMU Check wiring to the lit corresponding to station Replace the station connected ? station LMU Clear all No.200 programmings Dial at any M-station One of LINK BUSY lamps on Replace Station HCU lit brightly ? Turn on LINK SELECT switch(es) on HCU to make the total number of marked number to be the Replace number of LINK BUSY lamp lit. The station dialled correspond to ADDRESS-T lamp. Dial SIG. CORD lamps On dialling dial tone on HCU lit as Fig. 1 heard ? momentary Call from any station In other links, dial to any station tone and lamps OK ? Calling station and called station correspond to lamps Replace Station CPU-HCU lit on ADDRESS T and R SIG.CORD lamp lit as Fig.2 Replace SGD — Station Calling tone heard ? wiring Two way conversation OK ? In other links ? Replace CLU or DLU All other links OK ? concerned Conversation possible with all station ? Program No.200 functions END Table 1: Fig. 1 Fig. 2 If +24V or +18V is not in the range, check power supply (DS-510). If +12V or +5V is not in the range, replace DC/DC inverter. Replace HCU; OCU CPU Replace SGD HCU Station Replace CLU or DLU Replace Station CLU or DLU -61 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 are not correct. Abnormal voltage Right range: Replace AC and DC fuses. of +24V terminal. +24 ~ +30V Incorrect setting of the voltage selector. Faulty power transformer. Abnormal voltage Right range: of +18V. Abnormal voltage Right range: DC/DC inverter (MIV-02) is of +5V or +12V. defective. Battery is not Check the cur- Replace PCB of charging charged. rent flowing circuitry. into the battery. Right range: AC & DC operation Check all DC Replace PCB of charging lamps are OFF. voltage. circuitry. Buzzer does not operate. Note: Only when DC power supply (Battery) is employed. Blown AC and/or All DC output Over-current flows into one DC fuse. voltages are of plug-in units. correct. (Especially on +18V) MIV-02 is defective. heck all sta- Replacefuseaccordingto tions involv the following. ed in All-Call Number of stations Fuse paging. 0 ~ 30 DC 5A 31 ~ 64 DC 7A 65~ DC 10A -62 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 resistor (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 approximately 0.5 second. The lamps on the shorted lines will stay on more than 0.5 second. Power ON OFF Normal Lamp ON Abnormal (Short) Lamp ON (Brighter than normal) Lamp goes off gradually -63 1. One of transmitting lines (T-Line) is disconnected. Station EXCHANGE Symptom 1-1 1-2 1-3 1-4 1-5 A can make dialing. A can hear B . B can not hear A . Noise is heard at B Noise increases at pressed at A . . B when Press-To-Talk bar is 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 a...