Page 1: ...TELEPHONE PRODUCT TESTER U S Patent No 4 577 072 ...
Page 2: ... the risk factor if you know and observe the following safety precautions Do not insert fingers or any metal objects into either TELEPHONE TEST JACK Whenever tester is on 52 VDC is present at thejacks Also ringing voltages of 45 V rms LOW or 100 V rms NORMAL are present at TELEPHONE TEST JACK 1 the telephone cord and the telephone during the ring test If telephone cord insulation is cracked nicked...
Page 3: ...Test 15 Cordless Telephone Test 16 Answering Machine Test 16 FaxMachineTest 17 Page Automatic Telephone Dialer Test I 8 The Telephone Product Tester As A Demonstrator 18 TELEPHONE TROUBLESHOOTING CONSIDERATIONS 19 BLOCK DIAGRAM ANALYSIS 20 MAINTENANCE 23 Opening The Tester 23 Fuse Replacement 23 Line Voltage Conversion 23 Pulse Dial Leakage Jumper 23 Calibration 24 Closing The Tester 25 WARRANTY S...
Page 4: ... supplied for the testing of fax machines and answering machines Many telephone problems occur because of a faulty cord therefore it is advisable to test cords first If any cord is found to be defective the other tests should still be carried out after replacing the defective cord It is advisable to perform all tests on each telephone product tested This tester verifies performance of telephone pr...
Page 5: ...iliar sounds tester provides dial tone testing every and ring signalthat are identical to those suppliedby telephone exchange SECOND TELEPHONE CAPABILITY CORDTEST Permits voice quality of telephone to be checked when a second tele phone is available Fax machines and answering machines can also be Checks for shorts broken or intermittent conductors and badconnectors tested DIALTEST TELEPHONE LIGHTT...
Page 6: ... handset 2 wire and 4 wire modular cords for shorts or continuity Reset Sets display to 0 and removes dial tone when activated Shuts off ring signal when activated RING SOURCE Frequency 20 Hz RingFrequency Accuracy I Voltage 2selectablelevels Low 45 V rms 25 Normal 100 V rms 25 with lREN ringer equivalent number load Ring SineWave Purity Distortion 510 with IREN load Off Hook Detection DC line vol...
Page 7: ...est AutomaticDialer and Redial Pulse m e Verifies numbers dialed DTMF Uses a delay circuit to verify numbers dialed with rates up to I0 digitslsecond Digits are displayed at a rate of 2lsecond for easy verification DISPLAY Single 0 43 7 segment LED Delay feature for high speed dialer Display blanks momentarily to mark display update TONE CHARACTERISTICS Dial Tone 352 Hz and 440 Hz nominal Dial Ton...
Page 8: ...CONTROLS AND INDICATORS 1 2 3 4 AUX REV 13 12 11 10 9 8 7 6 5 Figure 1 Controls And Indicators 6 ...
Page 9: ...Button Selects main or auxiliary line in two line telephones 7 TELEPHONE TEST JACK 2 Input for second telephone for testing answering machines and voice quality 8 TELEPHONE TEST JACK I Input for telephone product to be tested 9 VOICEIDIAL LEVEL OK Indicator Lights when dialing tone is above minimum level Lights on voice peaks when level is above minimum required level 10 HANDSET CORD TEST Jacks In...
Page 10: ...ONS f dla6x p TELEPHONE PRODUCT TESTER I l l I l l RINGER LEVELS DISPLAY NORMAL TELEPHONECORD OR TESTS HANDSETCORD TUEPHONETESTJACKS POWER SINGLE AUX LlNE LlNE Note Insert only one cord at a time Figure 2 Cord Test Set Up ...
Page 11: ...me Do not plug in both cords at the same time Handset and telephone cords are not interchangeable and should not be plugged into the wrong jacks 1 Togglethe POWER switchON TheDIALED NUMBER DISPLAY indicator lights when the Telephone Product Tester is on 2 To test the telephone cord see Fig 3 for example of cord type for continuity or shorts plug both ends of the cord into the TELE PHONE CORD TEST ...
Page 12: ... RINGER LEVEL lights each time a digit is shows number button to clear the DIALED NUMBER pressed on a tone dial telephone telephone has dialed DISPLAY circuitry and display a 0 I POWER LOW NORMAL T Y O H E TEST4 E K S POWER 0 0 I Plua teleohone to be tested into 0 I i Figure 4 Dial Test Set Up ...
Page 13: ...ys a bar on the DIALED NUMBER DISPLAY Each digit should appear on the DIALED NUMBER DISPLAY in the same order as dialed The display blinks momentarily each time a new digit is displayed so that if the same digit is dialed two or more times in a row example 177 2266 each individual digit can be distinguished Also each time a number is pressed on a tone dial telephone the VOICEIDIAL LEVEL OK indicat...
Page 14: ...PRODUCT TER 10458 r RINGER LEVEL prwER F R R E p DISFUV NORMAL f TELEPHONE CORD TELERIMIE TEST J K K S POWER OR TESTS HANDSETCORD I VOICEIDIAL 1 2 ISNELE NORM SlffiLE AUX LEVEL BB a B M AUX REV LINE UNE 00 0 D E z z z l L Plug telephone to be tested into TELEPHONE TEST JACK I d I I Figure 5 Ring Test Set Up ...
Page 15: ...ring voltage it indicates that the telephone will not work in a long line situation when the telephone is to be used many miles from a switching station The telephone should be repaired or replaced If you wish to listen to the ringback tone while the telephone is ringing a second telephone can be plugged into TELEPHONE TEST JACK 2 and held up to your ear NOTE 1 Once ringing is initiated at the LOW...
Page 16: ... LEVEL OK Indicator should light occasionally when talking into telephone Press the RESETILOW RINGER LEVEL button to disconnect the dial tone Plug telephone to be tested into 2 TELEPHONE TEST JACK 1 Figure 6 Voice Level Test Set Up I4 ...
Page 17: ...ff hook You should now be able to talk and listen as if a telephone call has been completed between the two telephones a From telephone 1 you should be able to clearly hear the person talking into telephone 2 the telephone that is known to be in working order This checks the quality of the audio reception of telephone 1 b The person at telephone 2 should hear you talking intotelephone 1 This check...
Page 18: ...the answering mode and pick up telephone 2 take it off hook Press the NORMAL RINGER LEVEL button After enough rings have been generated the answering machine should answer the call for example if the answering machine is set to answer a call after five rings the answering machine should answer the call after the fifth ring If the answering machine fails to answer the call it should be repaired or ...
Page 19: ...tton The fax machine should answer the call If the fax machine would not answer the call in this step but did in step 4 the machine cannot be used in long line situations see RING TEST step 4 for explanation of long line It should be repaired or replaced 7 After the fax machine being tested answers the call you should hear the tones or observe the message indicating that it is ready to receive fro...
Page 20: ... same manner THE TELEPHONE PRODUCTTESTER AS A DEMONSTRATOR The Telephone Product Tester makes a good device for telephone demonstrations The Telephone Product Tester can be used to show a person how to operate special features of a telephone For example to demonstrate the use of a redial feature perform the DIAL TEST and the redial function of the telephone The tester can also be used to show a pe...
Page 21: ...lso returned to ea th ground through the power cord Since the tester already provides one earth ground point in the telephone an earth grounded test lead of another test instrument should not be connected to the signal common point To do so shorts one of the diodes of the bridge as shown in the illustration Because of the high impedance in series with the 52 V supply from the tester no damage occu...
Page 22: ...verses the dc polarity to test the telephone s ability to operate with either polarity The Dial Tone Ringback Signal Generator circuit generates two tones 440 Hz and 352 Hz mixes them together to produce aprecision dial tone and feeds this tone to the telephone As soon as the first digit is dialed from the telephone the dial tone is disconnected and the tones or pulses are fed to theDialed Number ...
Page 23: ...Delay I I I Line Off Hook Simulator Detector I POLARITY SIGNALIAUX LI LI TEST SWITCH SWITCH Oial Tone Ringback Off Hook Generator Detector Line Simulator 5 V TELEPHONE HANDSET f CORD CORD TELEPHONE HANDSET CORD CORD DIALED NUMBER DISPLAY TELEPHONE TEST JACK 1 TELEPHONE TEST JACK 2 L I Figure 7 Model 1045B Block Diagram ...
Page 24: ...ves the harmonics and passes a 20 Hz sine wave The ring signal is amplified to 100 V rms when the NORMAL RINGER LEVEL button is pressed The amplifier gain is reduced to provide a 45 V rms ring signal when the LOW RINGER LEVEL button is pressed The ring amplifier output applies the ring signal through TELEPHONETESTJACK 1 to the telephone under test When the telephone is taken off hook the Off Hook ...
Page 25: ...he case 3 Turn the unit over and lift off the top cover 23 Reassembly 1 Line up the slots in the top case half with the front panel and the back panel 2 Carefully push the top half onto the bottom half 3 Turn the unit upside down and replace the four screws FUSE REPLACEMENT If the fuse blows the DIALED NUMBER DISPLAY will not light and the instrument will not operate 1 To replace a fuse disassembl...
Page 26: ...label 1 Disassemble the case as described above 7 Reassemble case as described above PULSE DIAL LEAKAGEJUMPER 2 Locate the jumper wire JU1 JU2 JU3 JU4 or JU5 installed just forward of the two large power resistors near the right rear quarter of the printed circuit board Observe the jumper s location and JU The minimum impedance during dial pulse break intervals for a ringer designation which corre...
Page 27: ...our before performing calibration HIGH VOLTAGEIS PRESENT THROUGH OUT THE UNIT Test Equipment Required 1 True rms reading multimeter with at least 21 accuracy B K PRECISION Model 391 or equivalent Calibration Procedure 1 Disassemble the case as described above 2 Plug the line cord into an AC outlet and turn unit POWER to ON and set LINE switch to SINGLE out 3 Plug an 1 REN load into TELEPHONE TEST ...
Page 28: ...ble into TELEPHONE TEST JACK 1 and leave it connected there Telephones under test should then be plugged into the receptacle on the end of the extension cable When the receptacle on the end of the extension becomes worn the extension cable may be replaced rather than the much more difficult replacement of the front panel receptacle Order replacement extension cables from the B K PrecisionParts Dep...
Page 29: ...al applications of your instrument Technical advice on selecting the best instrument for a given task Information on optional accessories for your instrument Information on instrument repair and recalibration services Replacement parts ordering Information on other B K Precision instruments Requests for a new B K Precision catalog The name of your nearest B K Precision distributor Call toll free 1...
Page 30: ...roblem and include your name and address 4 Enclose proof of purchase date that is a dated copy of the sales receipt 5 Deliver to or ship PREPAID UPS preferred in U S A to the nearest B K PRECISION authorized service agency see list enclosed with unit If your list of authorized B K PRECISION service agencies has been mis placed contact your distributor for the name of your nearest service agency or...
Page 31: ...uct or as a result of unauthorized alterations or repairs It is void if the serial number is altered defaced or removed B K Precision shall not be liable for any consequential damages including without limitation damages resulting from loss of use Some states do not allow limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you This warranty gives...
Page 32: ...t could be mounted to the top of the tester or on a wall or counter next to the tester There are two different types of Velcro fabric Please notice the difference between the two Be sure to mount the felt material where the card is to be located To mount the card 1 Peel the backing from the felt material Velcro strips 2 Stick the felt Velcro strips to the card location 3 Push the other type of the...
