TOA Electronics EX-16 User's Manual
Contents
1. Replace LAU 16 5 2 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 SYMPTOM CHECK ITEM CAUSE Dialing can not be Replace the Disconnection of both T amp R Lines made at privacy off station and make amp R Lines are shorted mode sure that the station is not faulty Specific key does not Replace the Fault in key board switch or matrix circuitry operate station and make Fault in the dial generator Replace PCB sure that the board station is not faulty Calling tone can Same symptom Short or open in R Line not be heard remains even if Fault in LAU Sound from the the station is other party can not replaced be heard Becomes normal Disconnection of R Line or improper connec if the station is tion of the station connector replaced Fault in LAU Station fault Sound is not trans mitted to the other party Same symptom remains even if the station is replaced Short or open in T Line Fault in LAU Becomes normal if the station is replaced Fault in MIC circuitry of the station Replace MIC or PCB On dialing noise is heard by the called party Same symptom remains even if the station is replaced One of T Lines is disconnected Fault in LAU Becomes normal if the station is replaced Fault in MIC element Fa2. 4 1 4 BGM on off jumper J5 J6 J7 8 Jumper for BGM On Off BGM off BGM on J5 J8 For BGM on off operation remotely the control line can be extended the same way as for station wiring Station No LAU Jumper No BGM on off 2 Jt J5 3 J2 6 4 J3 47 5 J4 J8 6 J5 7 J2 J6 8 J3 J7 9 J4 J8 10 Jt J5 11 J2 6 12 J3 J7 13 J4 J8 14 J1 J5 15 4 J2 J6 16 J3 J7 8 8 Jumper wire 5 5 5 1 How to Connect the Jumper Wire 1 Use a 0 6mm diameter plated wire as jumper 2 Solder on the soldered end 3 Use asoldering iron with less than 30W power and with minimum leakage Be careful not to touch other parts 4 Installation Adjustment 4 1 4 2 Inspect Before Turning Power On Before supply power check the power connections power connections should be complete and the fuse Also voltage selector should be set correctly All modules should be in place Check the ROM on the CPU 16 It should be set securely in the socket Make sure that exchange and stations are properly connected Turn power on AC indicator lamp on the DSM 16 should go on If not electricity is not on Turn off power and check the connections and fuses
3. 2 Power On Off Remote Control When the system is used in conjunction with a PA amplifier for the external all call function the power switch of the PA amplifier can be turned on off with the relay built into the system Pressing buttons e and 8 invokes the make contact and the all call function until it is cancelled by pressing 19 3 8 4 Wiring Diagram 8 2 5 5 5 6 3 9 Connection of the Talk Back Unit Connection of the talk back unit is shown below EE 4 SPEAKER 6000 1KQ 16 TERMINAL BOARD i 4 OUTPUT to AUX MAX 10W or LINE input TKU 11 Fig 14 When the talk back speaker is used as a microphone sound clearness and microphone sensitivity vary according to the ambient noise level and in stallation position The sensitivity of the talk back speaker s microphone can be adjusted by the input volume control on the front of the TKU 11 Adjustment is necessary after installation 21 22 3 10 Connection of the Speaker Station In the EX 16 instead of using a station a speaker for one way conversation can be installed using a jumper in the LAU 16 This is possible at each station position on the LAU 16 3 10 1 Wiring Procedure a First determine the number of station speakers to be installed Any number of station speakers may be connected within the limits of the s
4. A Hands free B Up to 60 phons Above 60 phons A Hands free _ B Press to talk 5 Trouble Shooting Guide Repairing of the EX 16 system is basically done by replacing defective units with good ones The system s faults in an installation can be divided into the following categories 1 Faults in an exchange 2 Faults in a station 3 Faults in cable 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 Same symptom in every station Faut in specific station ony Fault in an exchange Cable fault Fault in a station Plug in unit Common control Power supply Misconnection in station jack Mis wiring such a short broken wire Key board switch fault Board assembling fault Speaker microphone fault Microswitch connecting cable fault 29 51 Fault in Exchange When the power supply unit or the CPU 16 is out of order the same kind of fault will occur at all stations When the LAU 16 is out of order a fault will appear only at a particular station If the exchange is out of order the faulty unit must be searched out and replaced Fault in exchange Check the power unit See 4 3 2 Yes Replace CPU 16 No Replace DSM 16 Yes
5. Handle plug in units with care plug in units incorporate CMOS After the exchange is turned on do not attempt to disconnect the plug in units Function Selection Select door remote or power remote as shown in the following diagram using the program switch on the CPU 16 CPU 16 P C B gt RY1 CC 1 JP2JP1 CIR r ROM Program Switch 25 Program Switch Details Mini Jump CPU 16 P C B Power Remote Door Remote 1 Set the mini jump in the JP1 position for door remote Relay goes on for 4 seconds when buttons and 8 pressed 2 Set the mini jump in the JP2 position for power remote Press buttons e and to turn relay on Press button to turn relay off Note The unit is set in the JP1 position door remote at the factory 4 3 Testing After 1 wiring is completed 2 power is turned on and all system functions are checked then testing for adjustment should be carried out The plug for each station should not be connected until the speech test is started 26 4 3 1 1 Turn on power switch on the exchange 2 Adjust the sound level of the external PA paging and check the power remote function a Connect one station b Press buttons 6 and 8 to test the sound level Adjust the volume control of the external amplifier 3 Comple
6. 8 3 kg 18 3 Ibs with 16 lines Exchange capacity can be increased within the given limits in units of 4 lines Exchange Specifications Ambient Temperature Range 32 104 F 0 40 C Audio Input Level 7dBm max Audio Output Level 30dBm max Bandwidth 200Hz 10KHz Crosstalk 60dB 1 5KHz Subscriber Impedance 600 ohms balanced input output Power Consumption 30W Power Source AC 110 120 220 240V 10 DC 24V 2 1 3 Further Details The exchange is composed of the following sections CPU Central Processing Unit LAU Line Amplifier Unit DSM Power Supply Module Integral terminal board for connecting stations The power supply module can be removed from the exchange case The exchange operates on AC DC power The exchange is a compact wall mounted type The connectors and terminal for stations are on the mother board and completely assembled at the factory Ea 90 6 6 QL WSQ ez YyoUMS 10109 96 29 0 esny 99 esny ov 008 H T Lee
7. 102 for easy con nection to cables 2 Wiring from the exchange to each station is an independent 4 wire system The fact that only 4 wires are necessary makes installation easier and with a 4 pin jack YC 101 or YC 103 at the end of each cable connection can be made quickly with only a screwdriver There are three types of stations available the desk top type the flush mounting type and the desk wall type Each type is available in 2 models master and substation and can be chosen in accordance with requirements 2 2 2 Specifications Stations are available in the following three models Optional Accessories Master Station Sub Station Desk Flush Mount Desk Wall Type Type Type with with without Function Handset Handset Handset Master Station HFM 500 HFM 510 HFM 100 Substation HFS 500 HFS 510 HFS 100 YC 100 Wall mounting panel for HFM 100 and HFS 100 YC 510 Back box for HFM 510 and HFS 510 Capable of calling any master substation in the system and also of using all available functions Capable of calling only its Master Station and also of using the privacy single digit dialing press to talk and BGM selection functions Station Specifications Permissible Loop Resistance 300 ohms Input Output Impedance 600 ohms balanced Loudspeaker Output 300mW maximum Handset Speaker Output 100mW maximum 2 3 Accessories 2 3 1 Wall Mounting Panel YC 100
8. OUT MAX 125 VA 6 D 18 3 8 1 BGM Input a b c Input impedance 50 KQ unbalanced Input level 10dB max Output level 100mW Remove the short bar connected to the terminal When BGM is not employed the short bar should be kept on the terminal If the short bar is not replaced a humming sound will be heard from the station The short bar is referred to on page 3 Connect the BGM equipment Be sure to use the type of BGM equipment which meets the input specifications Since the level adjustment cannot be controlled in the exchange the BGM equipment must have an output level adjuster After installation adjust the output level of the BGM through the speaker If the input is excessive there will be distortion 3 8 2 All Call Paging Output a Output impedance 6000 unbalanced Output level OdBm Connect a paging amp which matches the output specifications Test the paging output level and adjust to eliminate feedback Placing the speaker too close to the station sometimes causes feedback 3 8 3 Remote Control Output Output signal no voltage contact Contact capacity 125VA The program switch on the CPU 16 allows selection of either of the following 2 functions for remote control 1 Door Remote Control Every master station can be used as a remote control device for the door opening function Pressing buttons 1 and allows a 4 second interval wherein the door can be opened
9. d DSM Power Supply Module The Power Supply Module consists of a power supply unit for the exchange and terminals for external input and output connections This module is attached to the mother board with a connector and can be easily detached from the exchange LS SS 7 T ev power 18V GND supply DC in circuit GND remote bry BGM paging out e Integral Terminal for Connecting Stations The connection terminal for the exchange and stations is built into the exchange and connected to each LAU with a mother board Wiring of the terminal and the station will be explained in a separate section 2 1 4 System Block Diagram A block diagram of the EX 16 system is shown below In a standard system at least one LAU 16 is installed The remaining units are optional Each LAU 16 contains the necessary circuitry for four stations Ss XK X X X No 10 6 6 6 13 14 Station heme 1 Inside View LAU 16 s LAU 16 lls CPU 16 DSM 16 Units a i geen ie ln Stet at Se 2 2 Stations 2 2 1 Features The stations used in the Toa Intercom EX 16 have the following features 1 Each station is provided with a male 4 pin plug YC
10. km 22 25 3 0 411 35 1 7 300 0 64 1 35 115 2 2 24 20 1 0 521 54 5 5 500 0 51 1 71 179 1 1 3 4 Wiring General Information Wiring should be done independent of public telephone lines The wiring conduit is often installed underground or embedded in building structures such as walls and floors so care should be taken to draw up a wiring plan that has ample reserve for future extension of the system and that can be adapted to future remodelling or expansion of the building it is housed in Wiring systems must be planned with ample wires a conduit and with provisions for additions to the system Spacing Since the working voltage of this system is low and the current passing through it is small there is no major safety problem involved in the wiring However since interference due to contact with other indoor wiring can cause wire damage leakage and other problems spacing should be given close consideration when the small current wiring of this system is laid close to other indoor wiring particularly AC wiring The following chart lists spacing standards to be followed in respect to typical causes of interference Cause of Interference Minimum Remarks spacing acceptable without extra protection Heating pipe 6 15 cm This minimum spacing requirement should be observed since intercom cable is vulnerable to heat Water pipe 4 10 cm Radio transm
11. surpass conventional mechanical systems 1 All components of the exchange are designed according to the modular concept Each module and the integral terminals for connecting stations are connected to the mother board thus eliminating wiring between the two resulting in a sizable reduction in the number of procedures required to install the system 2 The exchange is a wall mounted type for space conservation 3 Wiring for each station is an independent 4 wire system which uses a minimum number of connecting wires resulting in greater ease in installation 2 1 Exchange 2 1 1 Features The features of the TOA EX 16 Intercom System are as follows 1 All components of the exchange are designed as plug in modules This results in a great increase in ease of maintenance expansion and in speed of the system installation 2 Extensive incorporation of IC s in the electronic circuits of the exchange results in a highly compact space saving design and in quieter operation than conventional intercom systems The system consists of only two types of basic electronic units This in turn means greater freedom in selection of an installation site 3 Since the system is completely electronic power consumption is kept to a minimum 2 1 2 Specifications The exchange is available with the following specifications EX 16 Capacity 16 lines max with paging function Dimensions 360 W X 300 H X 100 D mm 14 2 X 11 8 X 3 9 Weight
12. 3 10 2 Speaker Volume Adjustment 3 10 3 Connection with the Exchanger 3 10 4 On Off Control of BGM Installation Adjustment 25 4 1 Inspect Before Turning Power 25 4 2 Function Selection 02220 0 25 4 3 Testing aad sas edad 26 4 3 1 Precedure 4 3 2 Adjusting Method 4 3 3 Relationship Between Ambient Noise and Communication Mode Trouble Shooting 29 5 1 in devas 30 5 2 Fault in Specific Station 31 Gable cs osc ba BOSS ait abe 32 1 Introduction This is the installation manual for the exchange stations and other components of TOA Intercom System EX 16 It includes an outline of the system an explanation of installation cable connection inspection procedures and a troubleshooting guide Careful study of this manual is recommended prior to installation of the system This manual is only intended to give the information necessary for proper installation of the system Prior to installation of the system unpack the components of the system to make sure that they are in order 2 Introduction of the EX 16 System Because the EX 16 System is a fully electronic intercom system it has the following features that
13. INSTALLATION HAND BOOK KOBE JAPAN ee ee 1 2 Introduction of the 16 1 2 1 Exchange oeer We E ea eee 1 2 1 1 Features 2 1 2 Specifications 2 1 3 Further Details 2 1 4 System Block Diagram 2 2 STATIONS tls Ss teens hele hed eso dts oie dies 7 2 2 1 Features 2 2 2 Specifications 2 37 ACCESSORIES es vases ve ee ees ee 8 2 3 1 Wall Mounting Panel 100 2 3 2 Talk Back Unit TKU 11 Installation of the EX 16 10 31 Precautions for Installation 10 3 1 1 Exchange 3 1 2 Stations 3 1 3 Talk Back Unit TKU 11 3 2 Cable Installation 12 33 Core Diameter Versus Transmission Distance 12 FA WINING Ber ee ee tht Aah i 13 14 3 6 Connection between the Station the Exchange 15 37 AC DC Power Supply 18 3 8 Connection of the Input Output Terminal 19 3 8 1 BGM Input 3 8 2 All Call Paging Output 3 8 3 Remote Control Output 3 8 4 Wiring Diagram 3 9 Connection of the Talk Back 21 3 10 Connection of the Speaker Station 22 3 10 1 Wiring Procedure
14. The wall mounting panel is used for HFM 100 and HFS 100 when these stations are to be surface wall mounted 2 3 2 Talk Back Unit TKU 11 This unit optional amplifier 10W max and speaker Hi Z will allow high volume paging with response from speaker Conversations are conducted by using the press to talk bar for press to talk and release listen The talk back speaker also operates when all call paging is made from a master station SPEAKER Hi Z 6000 1 0 UNIT Fig 5 a 4 5 180 202 Power Switch Power Indicator Output Volume Control Input Volume Control Rubber Foot AC Inlet Voltage Selector 8 Pin Terminal Board Output Jack Terminal Board Cover SPECIFICATIONS Power Source Input Output Control Speech Control S N Dimensions Weight 100 120 200 240V AC Talk Back Max 30 dBm 6000 Amplifier Max 10W Hi Z Talk Back Max 10dBm 600Q Amplifier 0dBm 6000 Voice Switching Voice Switch or Press To Talk 55dB 204 X 202 X 98mm 2kg 10 3 Installation of the 16 System 3 1 3 1 1 Precautions for Installation Exchange Pay particular attention to the following points The layout should allow easy servicing and inspection The exchange is compact and lightweight however it is important to ascertain the strength of the wall on which it will be placed The exchange should be grounded Whe
15. ach station 3 If preceding steps do not remedy the situation replace the units attached to the station in the same order as the LAU 16 and CPU 16 and test again c In the event of a conversation failure or persistent noise during conversation 1 Disconnect the plug between each station and the exchange and check the wiring d If conversation is frequently interrupted 1 If speech from A to B is interrupted turn down the volume control of speaker at B s station 2 If speech from B to A is interrupted turn down the volume of speaker at A s station 3 If conversation is interrupted both ways or block oscillation should occur upon ceasing of the ringing tone turn down the volume at both stations Note 1 The volume control is located at the back of the station Adjust with a small screwdriver Note 2 The above mentioned trouble tends to occur when the station is installed in a room subject to echo or reverberations or when the station is not located properly with respect to the walls of the room it is in Avoid installation of the station in any of the locations illus trated in the following diagram 28 4 3 3 Relationship Between Ambient Noise and Conversation Mode The EX 16 system is provided with voice switches for the press to talk function which is required when the ambient noise level is high Below is a guide for using the press to talk function Up to 60 phons Up to 60 phons Hands free
16. e and R Line are shorted or mixed up Shorted or mixed up A EXCHANGE Symptom 3 1 not dial 3 2 Conversation is impossible between stations 3 3 When B dials A noise will be heard at B immediately after the calling tone 4 T Line and R Line are connected conversely g gt n N N R Line Conversed EXCHANGE Symptom 4 1 not dial 4 2 Conversation is impossible between stations 4 3 When B dials A noise will be heard at B 33 2 Sound amp Communications TOA ELECTRIC LTD KOBE JAPAN Printed in Japan
17. irections or separated as far as possible from each other The para branching operation the connection of more than one station to one circuit is not possible Adjust the volume switch and volume control on the station for com fortable speaker output level or for avoiding troublesome acoustical conditions e g reverberation or echo Stations are compact for easy installation almost anywhere However areas described below should be strictly avoided k An area where it will be exposed to fire heat or direct sunlight A dusty area where it will be exposed to metal dust or dirt Near a storage place for chemicals oil etc An area subject to vibration Near high voltage equipment In a strong electric field On the same circuit as a SCR type light dimmer 3 1 3 TKU 11 The talk back unit is to be installed with an optional amplifier max in the place where the talk back function is desired The speaker is to be a Hi Z trumpet speaker installed on the ceiling or wall The optimum installation site for the speaker is approximately 2m from speaking position The talk back unit should be placed by the optional amplifier The speaker should be installed as close to the talk back unit as possible Be sure to use shielded cable or twisted cable for the speaker wires to prevent interference caused by high voltage cables electromagnetic induction and high frequency waves 12 3 2 Cable Installation Wire type
18. itting coaxial cables CB and other Telephone wire More spacing is required 12 30 cm where there is a risk of Radio TV antenna coaxial induction cables amp twin lead Ground cable Protected heating and 4 10 cm cooling pipes 13 14 3 5 Piping Where wiring is to be passed through a wall or the like it should be protected by a hard PVC or metal tube If the number of connecting wires between an indoor terminal board and a station is small and the station s site is fixed so that it will not be moved frequently install a box at that site and pull wiring through a metal or hard PVC tube as required by job or ordinance Use a floor duct if the number of connecting wires is large and the stations are likely to be moved frequently Station wiring which must be laid across open areas of floor should be protected by plastic or metal shields See drawing below EXAMPLE Wire protector Floor duct Metal or Hard PVC tube Plastic or Aluminum Wire protector 4 Pin Jack 4 Station wiring Fig 10 3 6 Connection between the station and the exchange Station 4 Pin Plug YC 102 4 Pin Jack YC 101 YC 103 4 Pin Jack for flush mount NOTE Use 4 X 2 Switch Box for YC 103 11 Receiving Lines 2 not Polarity Specified 33 Transmitting Lines 4 not Polarity Specified Viewed f
19. n it is used in combination with other systems for example with a PA system the exchange should be connected to the other components for common grounding Choose a low source noise AC power supply for the exchange Line noise can affect speech quality Make sure that the AC power circuit provides adequate insulation and capacity This high performance exchange is compact as well as quiet and can be easily installed almost anywhere Areas described below however should be strictly avoided An area where it will obstruct traffic for example in a hallway or near the entrance or exit of a room An area where it will be exposed to fire heat or direct sunlight Suitable ambient temperature is 32 104 F 0 40 C A dusty area where it will be exposed to metal dust or dirt Near a storage place for chemicals oil etc An area subject to vibration Near high voltage equipment In a strong electrical field Near equipment vulnerable to the influence of an electrical field 3 1 2 Stations Particular attention should be given to the following points during installation A desk type wall mounting type or desk wall type should be chosen according to the user s need If the all call paging or talk back function is adopted precautions should be taken to ensure against feedback due to interference between the station microphone and the paging or talk back speaker that is they should be installed facing different d
20. number of wire pairs and number of individual wires are to be determined for individual sections of the wiring system according to the guidelines set down below 4 wire twisted pair cables are to be used for wiring between indoor terminal boards intermediate terminal boards main terminal boards etc Outdoor wires should be used where wiring passes through inaccessible areas such as in ceilings or under floors Indoor wires may also be used however in cases where there is no risk of deterioration due to exposure to heat etc The number of cable pairs laid should be determined considering the possibility of future expansion of the system There is a limit to the diameter of cables that can be used to connect stations to the terminals of EX 16 This limit must be taken into con sideration when planning the wiring of this system The diameter should measure between 0 016 0 41mm and 0 031 0 79mm 3 3 Core Diameter Versus Transmission Distance The diameter of the cable to be used should be determined so that the set limits for speech attenuation 388 maximum for transmission from the exchange to the station and forthe DC resistance DC loop resistance less than 300 ohms are met Speech Attenuation DC Loop Resistance and Service Distance as Functions of Core Diameter Speech DC Loop Service AWE NG Core Attenuation Resistance Distance solid Diameter dB per 1000 ft Q per 1000 ft ft mils mm dB per 1 km Q per 1 km
21. rom the station side 1 2 4 i 15 16 Clipping Tool YC 105 Note Connect the individual cables in order starting with the top ter minal When using the clipping tool be sure that the cutting edge is on the side of the wire to be cut off Clip Terminal LCs Clip Terminal Side View TERMINAL BOARD 2 22 lt 23 2 4 c51 gt 2 3 2 4 lt 501 e722 3 4 21 2 3c 4 cic 2c 54 2 3 5 4 74 42 3 4 11 2c 3 4 10 11 Ja 17 EX 16 WIRING INSTRUCTIONS 1 STATION CONNECTIONS 17 37 AC DC Power Supply Connection A 5P terminal for AC and DC power supply is provided on the DSM 16 The power cable YA 308 or YA 309 can be connected to the 5P terminal Be sure to ground the exchange 5P Terminal on DSM 16 Power Supply Cables YA 308 AC 100V 240V DC 24 50 60Hz J YA 309 30W 3 8 Connection of the Input Output Terminal A 6P terminal for the input output signals of the EX 16 is provided on the DSM 16 6P Terminal DSM 16 BGM IN 50KQ UNBAL N 5 10dB PAGING OUT ae 6000 UNBAL OdB 5 REMOTE
22. seg Yous 86 0 eM 5 6 HEM 1 SNOISNANIA 9 19290999 91 2 5 dwy 9 syed ainjoniys b CPU Central Processing Unit The Central Processing Unit is divided into two sections common control and speech path Common control This section consists of a microcomputer and associated other circuits It controls receiving dial data from stations opening and closing of speech path controlling of signal paging and BGM switches in accordance with the exchange program Speech path This section consists of a voice switching circuit signal generator link busy signal circuit BGM amp and the paging amp It is controlled by the common control section remote control control circuit link voice switching circuit link busy LAU Line Amplifier Unit The Line Amplifier Unit consists of a power supply circuit for stations transmitting and receiving circuits for voice signal speech path switches BGM switches and the dial data receiving circuits One unit accepts up to 4 stations A maximum of 4 LAU s can be installed receiving switch transmitting circuit R circuit control signal dial data in dial
23. tation numbers from No 2 to No 17 b Use the Wiring Instruction Chart to determine the LAU No and Jumper No corresponding to the station number See page 24 c Remove the corresponding LAU 16 from the mother board d Connect the corresponding jumper points with the jumper wire See page 24 3 10 2 Speaker Volume Adjustment 1 Speakers with an impedance of 600 ohms or more may be used without the need for a transformer If it is desired to use lower impedance speakers a transformer should be used to assure proper impedance matching 2 Volume may be controlled only when a a matching transformer is used low volume 3 3KQ oe at To exchange high volume COM b a resistor is connected Rs approx 1W To exchange sp The Rs value should be decided in accordance with the speaker impedance so that the volume is on a suitable level 3 10 3 Connection with the Exchange Connect speakers to terminals 1 and 2 as shown in the diagram Leave terminals 3 and 4 open Terminal 3 10 4 On Off Control of BGM BGM can be turned off when the jumpers are connected as shown in the diagram If the jumpers are not connected BGM will be heard from the speaker stations constantly See page 24 23 24 Jumper for Speaker Station Selection WOE
24. te a speech test with each of the other stations a Connect the plug for the station to be tested b Dial the station number Check the sound level and the speech quality c Dial and 8 If a howling noise is heard then the paging speaker stations are too close together 4 After the speech test is completed for all stations the sound level adjust ment for BGM should be done To begin the sound level should be set so that the BGM is heard from all stations when the power switch of the exchange is turned on To turn off the BGM press the PTT key once 4 3 2 Adjusting Method a If exchange does not work 1 Turn off the power and disconnect all units from the mother board 2 Turn on the power and check the DC voltage at the points on the mother board illustrated below GND 18 17 19 1 2 3 4 5 6 7 9 10 11 12 13 14 15 16 17 18 19 20 21 2 5V 4 7V 5 3V 18V 17V 19V 5V 4 7V 5 3V GND 24V 24V 30V 27 3 If the voltage measured is normal at every point connect one unit at a time checking the voltage after each connection 4 If the voltage is upset after connecting any given unit the unit is to be replaced b If there is no response to dialing 1 Disconnect the plug for the particular station from the line and check the wiring between the exchange and the station 2 If no wiring error is detected test after changing e
25. ult in T Line of the station Low frequency oscillation of MIC AMP Faulty bypass capacitor Sound of the other party is broken during call Same symptom remains even if the station is replaced Adjust the volume control of station speaker if the room produces reverberation Lower the volume Increase the gain of MIC AMP Replace PCB after checking if MIC unit is not touching its case Immediately after the calling tone the line switches to cancel busy dial tone etc Same symptom remains even if the station is replaced One of R Lines is disconnected Fault in LAU Station fault Becomes normal if the station is replaced One of the Lines is disconnected the station connector is not connected properly 31 32 5 3 Fault in Cable 1 One of transmitting lines T Line is disconnected Disconnected Station B Station A 4 N R Line EXCHANGE Connector numbers T Line ANG Symptom 1 1 Acan dial 1 2 A hear 1 3 1 4 Noise is heard at 1 5 Noise increases at B when Press To Talk bar is pressed at A 2 of receiving lines R Line is disconnected xX N R Line Disconnected EXCHANGE Symptom 2 1 A can dial without dialing tone 2 2 When B dials A busy tone or dial tone will be heard at B immediately after the calling tone 3 T Lin
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