NEC TTS 26B Instruction Manual Download | Manualshive

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Summary of Contents for TTS 26B

Page 1: ...l NSTRUCTION MANUAL FOR MODEL TTS 26 B PULSE SIGNALING TEST SET ISSUE 2 NORTHEAST ELECTRONICS CORPORATION P 0 BOX 649 CONCORD N H 0 3 3 0 1...

Page 2: ...or any other special or consequential damages sustained or expenses incurred by the buyer by reason of the ilse or sale of any defective NEC product No products may be returned to NEC except with our...

Page 3: ...IPTION MAINTENANCE ELECTRONIC PARTS LIST LIST OF ILLUSTRATIONS Title Front Panel Controls Send Circuits Receive Circuits Meter Circuit Meter Circuit Meter Circuit Supervisor Monitor Circuits TTS 26B B...

Page 4: ...ng the high impedance meter circuit to the circuit under test either directly o r through a low imped ance slave relay The meter slave relay is particularly useful when testing circuits which have hig...

Page 5: ...nd TEST Key Switch TWD L Key Switch TWD D Key Switch SEND Turnbutton Switch SPARK SUP Turnbutton Switch DROP E G O M B O DROP E G B M B O Toggle Switch JACKS 1 EXT DIAL 2 SEND RELAY 3 SEND 1 LOOP 4 SE...

Page 6: ...TTS 26B Section 2 Figure 3 1 Front Panel Controls...

Page 7: ...s ADJ 70BREAK Provides the means for adjusting the 70break of the POTENTIOMETER transmitted pulses f r o m the internal oscillator o r f r o m an external dial METER CAL Provides the means for calibr...

Page 8: ...o control both sending and receiving functions METER CIRCUIT Provides the following measuring functions i n clockwise switch sequence 1 0 25 PPS Pulse Speed 2 70BREAK DIRECT 3 70BREAK T HRUMETER RELAY...

Page 9: ...2 SEND SLEEVES operated counter clockwise In normal use this switch should be in the SEND RT ON 1 2 position The pricipal use for the SEND SLEEVE position is for special applications where direct acce...

Page 10: ...vides for connection to accessory covers Located in upper left of panel 2 EXT DIAL Binding Posts 2 Provides for connection of an external dial source of pulses o r of a telephone set located in upper...

Page 11: ...runk i s completed through the set However it should be noted that during the patch ing operation an interruption in the continuity of the trunk i s caused This would result in 1 hit that would be det...

Page 12: ...METER h Turn the FUNCTION switch to CAL VoBREAK i Turn the FUNCTION switch to SEND AND REC CAUTION When the TTS 26B i s used to pulse repeaters carrier pulsing units etc care should be exercised to si...

Page 13: ...the end toward the set using tip and ring conductors 0 After dialing on the circuit it i s possible to listen to the ringing and to talk on the circuit by turning the EXT DIA L CIRCUIT switch to TALK...

Page 14: ...ik rharnba arore Weetedbyttm SEN0 OR SEM AN0 R E E M switch Contacts are shownintha makeor off hook position SarO LOOP REC UXR NOTE InM spdtiar d Wia switch The E led stofaha fs aka controlled bythe D...

Page 15: ...ty and volt jack is used diode protection within the set then connect it to the 48 volt dc supply will protect the set f r o m damage but the set will be inoperative in succeeding steps d Turn the SEN...

Page 16: ...CEIVEswltch position 0 25PPS 7HR I METER RELAY LOOP L SEND OR SEND AND RECEIVE smnn 0 25 pps THRU METER RELAY REC L O O P rC Lm SEND OR SEND AND RECEIVE s w m RECEIVE SWITCH V I SNOORSEND AND RECEIVE...

Page 17: ...complished while the METER CAL control is being adjusted by having a short circuit o r off hook present at the source of signals It also is import ant that this adjustment should be made AFTER the rec...

Page 18: ...ner of the panel MUST be turned to SEND RT ON 1 2 g Turn the METER CIRCUIT switch to 70BREAK If the circuit has high inductance or capacitance DIRECT that may distort the pulse wave shape the METER CI...

Page 19: ...tch is used fully clockwise to transfer control to the SEND o r SEND ANDREC switch turn the latter switch to E M DROP E G O M B G g Turn the METER CIRCUIT switch to O o BREAK DIRECT RESULT It should b...

Page 20: ...TED BY AECEIM SWITCH ONLYFORALL POSlrlONSOFTHIS SWTCH U CEPT EXTREMEC L O W I S E POSmONS LOOP SRiNALW 0 25 PPS METER CIRCUIT SWITCH 0 25 PPS X BREM DIRECT BREAK THW METER RLY METER CIRCUIT SWITCH Fig...

Page 21: ...tment back off the adjustment s c r e w slightly to remove mechanical contact between the adjustment s c r e w and the m e t e r m e c h a n i s m This completes the mechanical adjustment of the m e t...

Page 22: ...O f TIUS REC G AN00 1 f cQOe SIGNALING EANDM SELECEO BY SEND OR SEND W O RECElM SWITCH ONLY WIEN RECEIVEISINEXTREME CLOCKWISE POS4llDN X BREAK SCALE 0 25 PPS O X BREAK DIRECT BREAK fWRU METER R Y MET...

Page 23: ...switch should be turned to O o BREAK fHRU RELAY instead o r erroneous readings m a y be obtained Adjust the METER GAL control to obtain 0 on the BREAK scale of the meter Read the Ojo break on the 70BR...

Page 24: ...office patch the circuit turned down to traffic to the LOOP SIGNALING REG LOOP jack If a wet loop is involved battery should be on the tip and ground t on the ring If the internal oscillator o r a loc...

Page 25: ...s merely repeated o r converted but not measured adjustment of the METER CAL control i s not necessary as long as it i s s e t near its mid range 3 24 F o r the first case listed in para 3 22 the pro...

Page 26: ...ch to BREAK DIRECT m Connect the circuit with the incoming signals to the EXT DIAL jack or terminals n Turn the EXT DIAL CIRCUIT switch to the applicable position in the following tabulation I DIAL RE...

Page 27: ...DIAL ADJ BREAK DlAL RELAY M h0 DIAL RELAY E f T EXT DIAL DRIVE llDJ X BREAK 48 VDC EXT DIAL EXT D I M BREAK ADJ X BREAK SUPERVISORY MONITOR CIRCUIT FUNCTION key switch in the TEST L AND 0 position LIM...

Page 28: ...ge the 310 type plug to the other 48 VOLT jack and then reconnect the 48 volt dc power supply f If the internal oscillator i s to be used as the source of pulses operate the FUNCTION key to SEND OSC I...

Page 29: ...ssion circuit The position of the SPARK SUP turnbutton switch determines whether o r not the spark suppression circuit is a c r o s s the relay contacts The SEND RELAY jack is connected to the SEND re...

Page 30: ...s i s used to read pulse speed 4 7 A calibration control in series with the meter permits setting an accurate full scale reading i e 070break for battery voltages from approximately 40 to 55 volts 4 8...

Page 31: ...break on the contacts of this slave relay 4 15 SENDING SECTION 4 16 The sending section of the set provides the means for generating signals which may be sent on loop or E Mcircuits When the FUNCTION...

Page 32: ...IT S 2 PUNCTIONI ON OFF WK SND CAL NOT S W N S 9 REC S 3mSEND OR SEND REC 9 10 ON OFF HK S 4mEXT OlAL CKT S II ON OFF HK S 5sTEST SND DIAL SND OSC S 6 SND RT SL NOT SHOWN S 7mSPARK SUP NOT SHOWN E CL...

Page 33: ...of the circuits under test is not affected by the spark suppression circuit PULSES PER SEC control to the position corre sponding to the speed of the dial used 4 19 The internal oscillator i s a conve...

Page 34: ...Section 4 EXT ADAP PLUG I I I I FurcTION S 2...

Page 35: ...DIAL jack is retransmitted through whichever SEND jacks are selected by the SEND switch By turning the FUNCTOIN switch tern porarily to the ADJ O o BREAK position the break of the signals transmitted...

Page 36: ...s required no warm up period is required for this unit The operation of this circuit i s a s follows 4 38 The circuit diagram to which the following description applies is shown i n fig 5 1 The locati...

Page 37: ...nsists of capacitor C13 The energy previously stored in capacitor C12 has now been deposited in the meter storage circuit The voltage potential to which the meter circuit can become charged is thus di...

Page 38: ...ier circuitry as follows 5 6 Referring to fig 5 1 connect an oscilloscope between point A and ground Point A is shown in fig 5 2 which is the drawing of the printed cir cuit board assembly The sine wa...

Page 39: ...and S5 i s in the DIAL position the external dial circuit is carried directly through to the T R of SEND LOOP jacks 1 and 2 This is accomplished over contacts of S4 and S5 Should the TALK circuitry fa...

Page 40: ...r e coupled directly to the coil of slave relay K4 The make contacts of this relay then in turn supply the pulses as received by the meter circuit Should this circuit fail to operate the trouble will...

Page 41: ...R3 R4 and R5 R6 R7 R9 R15 R16 R17 R19 R21 R25 R26 R27 R28 R30 R31 R32 R33 R34 R35 R36 R39 R41 C1 and C2 C3 and C4 C5 C6 C8 C11 C12 C13 CRl K4 K5 DS1 F 1 Description Diode Si Relay SPST Relay A type La...

Page 42: ...Section 6 TTS 26B TOP Figure 6 2 Component Location E95026...

Page 43: ...hru Q5 Q6 Description R 400 1070 2W R lK lO w R loOK 100 0 iw R 10Ky 1070 W R 27K 1 0 7 0 W R lM 10 0 W R 390 10 W R 1 5K lOOJo 1 W R 1 1 0 0 R lK loyo 1 W Lamp screw base R 10K 1 0 7 0 W Transistor S...

Page 44: ...ne type jack Telephone type jack Telephone type jack Telephone type jack Telephone type jack Front Panel Assembly Manufacturer Part FSCM Code No Number Ref Desig Description R19 and R24 R32 R36 Key sw...

Page 45: ...on 3 0 except power supply jacks are designated 24V or 48V Circuit Description With the exception of the 24 to 48 volt change over circuitry the operation of the Model TTS 26BCD is the same as describ...

Page 46: ......

Page 47: ...lacement Parts For Circuits Involvi ng24 Volt Operation Circuit Ref Capacitor Resistor fixed paper 1 5 mfd fixed composition 59 vdc Resistor variable wirewound 500 ohms Mfr Mfr s Designation G Series...

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