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Summary of Contents for Elenco Electronics 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...
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Page 2: Specifications
Are you planning to install a new telephone? Are you having a problem with a newly installed telephone? Then the Model TT-400 Telephone Line Analyzer Kit will help you pinpoint exactly where the problem is. The TT-400 connects between your telephone and the telephone wall jack and performs the following four tests: a) Line Test - Verifies the DC voltage to your telephone. -
Page 3: Telephone Operation
TELEPHONE OPERATION The primary purpose of the telephone is to transmit and receive voice signals allowing two people with telephones to communicate with each other. To be of practical value, the telephone must be connected to a switching network capable of connecting each telephone to many other telephones. - Page 4 fixed rate. This switch is in series with the hook switch. Opening the switch interrupts the current in the local loop. A series of current pulses is thus sent out on the local loop as shown in Figure 3. The number of pulses sent corresponds to the digit dialed.
- Page 5 RINGER Bell Hammer As shown in Figure 2, the ringer is connected across the tip and ring inputs in series with a capacitor to block the 48VDC. The ringer consists of a permanent magnet attached to an armature as shown in Figure 7. When Armature an alternating current of 20Hz is passed through the coils, the armature is Permanent...
- Page 6 CONSTRUCTION Introduction The most important factor in assembling your Telephone Line Analyzer is good soldering techniques. Using the proper soldering iron is of prime importance. recommended. The tip of the iron must be kept clean at all times and well tinned. Safety Procedures •...
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Page 7: Parts List
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. - Page 8 ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD In all of the following assembly steps, the components must be installed on the top legend side of the PC board. The board is turned to solder the component leads on the foil side. R3 - 15k 1/4W 5% Resistor (brown-green-orange-gold)
- Page 9 Mount the Meter Take off the four nuts, lockwashers and washers from the mounting screws on the meter. Insert the meter into the case from the front. Replace the four washers, lockwashers and nuts onto the meter as shown in Figure D.
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Page 10: Final Assembly
Modular Jack Cut off the yellow and black wires at the base of the modular jack (they are not used). Cut the red and green wires to 4” and strip 1/4” of insulation off of each wire. The spade lugs (if any) are not used. -
Page 11: Calibration Procedure
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 is not available, apply 20VDC between J1 and J2, and adjust R5 so that the meter reads on the last line of the letter “N”... -
Page 12: Simplified Instructions
SIMPLIFIED INSTRUCTIONS (FOR MORE DETAIL, SEE DETAILED INSTRUCTIONS). LINE TEST 1. Set the switch of the TT-400 to the LINE/RING 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. - Page 13 When hung up, the telephone should have practically no effect on the telephone line. 6. If the meter is still not in the LINE OK area with all telephones unplugged, the problem is in the line. Recheck and if necessary, remove and rewire any newly installed wires. 7.
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Page 14: Schematic Diagram
telephones on the same line are also hung up. 3. The TT-400 meter should read in the LOOP OK area. If not, unplug each telephone one at a time. If unplugging a telephone causes the TT-400 meter to read in the LOOP OK area, that telephone is probably defective. - Page 15 QUIZ 1. The Central Office senses that service is being requested when . . . A - a dial tone is received. B - a current flows in the local loop. C - the telephone rings. D - a 90VAC 20Hz ringing signal is received. 2.
- 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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