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Elenco Electronics TT-400K, Assembly And Instruction Manual, Page: 7 / 16

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Elenco Electronics TT-400K Assembly And Instruction Manual Download Page 7

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ASSEMBLY INSTRUCTIONS

INTRODUCTION

Assembly of your TT-400K Telephone Line Analyzer will prove to be an exciting project and give much
satisfaction and personal achievement. If you have experience in soldering and wiring technique you should
have no problem in the assembly of this kit. Care must be given to identifying the proper components and in
good soldering habits. Above all, take your time and follow the easy step-by-step instructions. Remember, “An
ounce of prevention is worth a pound of cure”. Avoid making mistakes and no problems will occur.

PARTS LIST

RESISTORS

Qty

Symbol

Description

Color Code

Part #

1

R4

200

Ω

5% 1W

red-black-brown-gold

132002

1

R2

4.7k

Ω

5% 1/4W

yellow-violet-red-gold

144700

1

R3

15k

Ω

5% 1/4W

brown-green-orange-gold

151500

1

R6

100k

Ω

5% 1/4W

brown-black-yellow-gold

161000

1

R1

50k

Ω

Pot Trim

191550

1

R5

100k

Ω

Pot Trim

191610

DIODES

Qty

Symbol

Description

Part #

5

D1 - D5

1N4004

314004

1

D6

LED (Light Emitting Diode)

350004

MISCELLANEOUS

Qty

Description

Part #

1

PC Board

517300

1

Switch DPDT

541009

24” Solder Roll

551124

1

Meter

572002

1

Modular Jack

621007

1

Telephone Cable Assembly

621008

1

Case Top

623108

2

Aluminum Spacer 4-40 x 1/2”

624431

1

Case Bottom

62PX2GB

1

Screw 4-40 x 1/4” Phillips Flat Head

641431

3

Screw 4-40 x 1/4” Phillips Black

641433

4

Screw #4 x 1/2” Phillips

642465

1

Wire 22 Black Solid 7.5”

814120

Resistor

Color bands show

resistor values

PARTS IDENTIFICATION

Diode

LED

Modular Jack

Flat

Summary of Contents for TT-400K

Page 1: ...TELEPHONE LINE ANALYZER KIT MODEL TT 400K Assembly and Instruction Manual Elenco Electronics Inc Copyright 1994 Elenco Electronics Inc Revised 2001 REV C 753253 ...

Page 2: ...one line from the telephone company central office to the wall jack in your house d Telephone Line Cord Test Verifies the condition of your telephone cord if detachable SPECIFICATIONS DC LINE TEST SWITCH POSITION LINE RING LINE OK FOR 1 3 OF FULL SCALE Vin 40VDC FOR FULL SCALE Vin 120VDC REVERSE POLARITY IF PHONE LINE POLARITY IS REVERSED LED WILL BE ON ACCURACY 3 AT 40V DC LOOP TEST SWITCH POSITI...

Page 3: ...48VDC present on the local loop A ringing tone is also sent to the calling telephone When the called party picks up the phone voice communication is established THE ROTARY DIAL TELEPHONE A simplified schematic diagram of the traditional rotary dial telephone is shown in Figure 2 The major parts of this telephone are explained below In the newer electronic type telephones many of the bulky parts of...

Page 4: ...ough the carbon granules When you speak into the transmitter the sound waves of your voice strike the diaphragm and cause it to vibrate This causes the carbon granules to compress and expand When compressed the resistance of the carbon granules is less than when expanded The change of resistance causes a corresponding change in the current The current thus varies in step with the sound waves of yo...

Page 5: ...TION COIL BALANCE NETWORK When transmitting and receiving is done over the same two wires the problem arises that current from the transmitter flows through the receiver The speaker then hears his own voice from the receiver This is called sidetone Too much sidetone may be objectionable to the speaker and cause him to speak too softly A small amount of sidetone is desirable to keep the telephone f...

Page 6: ...onent Lead Solder Soldering Iron Drag Foil 1 Solder all components from the copper foil side only Push the soldering iron tip against both the lead and the circuit board foil 2 Apply a small amount of solder to the iron tip This allows the heat to leave the iron and onto the foil Immediately apply solder to the opposite side of the connection away from the iron Allow the heated component and the c...

Page 7: ... 200Ω 5 1W red black brown gold 132002 1 R2 4 7kΩ 5 1 4W yellow violet red gold 144700 1 R3 15kΩ 5 1 4W brown green orange gold 151500 1 R6 100kΩ 5 1 4W brown black yellow gold 161000 1 R1 50kΩ Pot Trim 191550 1 R5 100kΩ Pot Trim 191610 DIODES Qty Symbol Description Part 5 D1 D5 1N4004 314004 1 D6 LED Light Emitting Diode 350004 MISCELLANEOUS Qty Description Part 1 PC Board 517300 1 Switch DPDT 54...

Page 8: ...sistor red black brown gold D4 1N4004 Diode see Figure A S1 Switch R5 100kΩ Trim Pot R6 100kΩ 1 4W 5 Resistor brown black yellow gold Figure A Diodes have polarity Mount them with the band in the correct direction as shown on the PC board Figure B Mount the LED with a 5 32 gap between the LED and the PC board The flat side of the LED should be in the direction shown on the PC board 7 ASSEMBLE COMP...

Page 9: ...ure E Lay the cable out flat with the top side of the connector facing up as shown in the figure be sure that the cable is not twisted Cut the wire shown in the figure to 1 Strip the insulation off of both wires 1 4 Insert the telephone cable through the hole in the PC board from the top legend side as shown in Figure F Insert the 1 wire from the foil side into PC board hole J2 see top legend for ...

Page 10: ...of the board Insert the 2 3 4 wire into PC board hole J5 from the foil side Solder in place and cut off the excess wire from the top legend side Solder the loose end of the 2 3 4 wire from PC board hole J5 to the positive lug on the meter as shown in Figure H Solder the loose end of the 4 3 4 wire from PC board hole J6 to the negative lug on the meter FINAL ASSEMBLY Place the jack into the hole in...

Page 11: ...l by using too much solder or by dragging the soldering iron across adjacent foils Break any bridges with your soldering iron Figure 8 R5 J2 R1 J1 Figure 9 20V Position 40V Position CALIBRATION PROCEDURE 1 Set the switch to the LINE RING position Apply 40VDC between J1 and J2 be sure J1 is positive see Figure 8 Adjust R5 so that the meter reads on the line at the start of the LINE OK area if 40V i...

Page 12: ...the TT 400 to LOOP position and connect it and the telephone as shown in Figure 10 2 Hang up the telephone connected to the TT 400 All other telephones connected to the same line should also be hung up 3 The meter reading of the TT 400 should be in the LOOP OK area 4 Return the switch to the LINE RING position When left in the LOOP position anyone attempting to call you will get a busy signal DETA...

Page 13: ...e meter was already in the RING OK area it should increase at least 1 8 further into the area The needle will vibrate at 20 Hertz during the ring signal 3 If the meter increases 1 8 into the RING OK area and the telephone still does not ring the telephone ringer circuit is probably bad 4 If the meter does not increase 1 8 into the RING OK area and the telephone does not ring the problem may be due...

Page 14: ... off hook and anyone trying to call you will get a busy signal TELEPHONE CORD TEST If the line voltage check out OK but the telephone still does not work the telephone line cord may be bad This test checks the condition of the line cord It may be done only if the telephone line cord can be unplugged at both ends Before starting the test check that the line cord is fully inserted into the jack at b...

Page 15: ...of a capacitor generates a voltage 6 In the traditional rotary dial telephone the transmitter consists of A a speaker similar to those found in your radio and TV B a piezoelectric buzzer C a case filled with carbon granules D an electret microphone 7 In the traditional rotary dial telephone the receiver consists of A a speaker similar to those found in your radio and TV B an integrated circuit C a...

Page 16: ...Elenco Electronics Inc 150 W Carpenter Avenue Wheeling IL 60090 847 541 3800 http www elenco com e mail elenco elenco com ...

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