Elenco Electronics TCT-255K Assembly And Instruction Manual
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Elenco Electronics TCT-255K Assembly And Instruction Manual

Elenco Electronics TCT-255K Assembly And Instruction Manual

Multi-network cable tester kit
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MULTI-NETWORK CABLE TESTER KIT
MODEL TCT-255K
Assembly and Instruction Manual
Elenco Electronics, Inc.
Copyright © 2001 Elenco Electronics, Inc.
753089

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  • Page 1 MULTI-NETWORK CABLE TESTER KIT MODEL TCT-255K Assembly and Instruction Manual Elenco Electronics, Inc. Copyright © 2001 Elenco Electronics, Inc. 753089...

  • Page 2: General Discussion

    INTRODUCTION The TCT-255 Cable Tester is a convenient instrument for testing different unshielded wiring schemed communication cable with RJ-11 and RJ-45 connectors and coax cable. This tester can be used for testing cables before and/or after they are installed. The tester offers easy operation by having to push only one button.
  • Page 3 IDENTIFYING RESISTOR VALUES Use the following information as a guide in properly identifying the value of resistors. IDENTIFYING CAPACITOR VALUES Capacitors will be identified by their capacitance value in pF (picofarads), nF (nanofarads), or mF (microfarads). Most capacitors will have their actual value printed on them. Some capacitors may have their value printed in the following manner.
  • Page 4 CONSTRUCTION Introduction Assembly of your TCT-255 Multi-Network Cable Tester Kit will prove to be an exciting project and give you much satisfaction and personal achievement. If you have experience in soldering and wiring techniques, then you should have no problem with the assembly of this kit. Care must be given to identifying the proper components and in good soldering habits.

  • Page 5: Troubleshooting

    A poorly soldered joint can greatly affect small current flow in circuits and can cause equipment failure. You can damage a PC board or a component with too much heat or cause a cold solder joint with insufficient heat. Sloppy soldering can cause bridges between two adjacent foils preventing the circuit from functioning.

  • Page 6: Parts Identification

    PARTS LIST - SECTION A Qty. Symbol Description R12, R17 1kW 5% 1/4W 5.6kW 5% 1/4W 12kW 5% 1/4W 3.3MW 5% 1/4W Qty. Symbol Value 22mF Qty. Symbol Value 1N4001 1N4736 1N5235 Q2, Q3 2N3904 2N3906 40106 Qty. Symbol Description PC Board Tester TCT-200 Switch Push Button DPDT Battery 9V...
  • Page 7 ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD In all of the following 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. R17 - 1kW 5% 1/4W Resistor (brown-black-red-gold) (see Figure A)

  • Page 8: Section A - Power Supply

    SECTION A - POWER SUPPLY When the SW1 (test button) is pushed, capacitor C2 (see schematic diagram, Figure 1) is charged to the battery voltage. Transistor Q1 turns on and all of the circuits in the tester are powered. If you don’t push SW1, capacitor C2 begins discharging.
  • Page 9 PARTS LIST - SECTION B Qty. Symbol Description 18kW 5% 1/4W 100kW 5% 1/4W Qty. Symbol Value Qty. Symbol Value Qty. Symbol Description Socket IC 8-pin Resistor ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD In all of the following 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.
  • Page 10 SECTION B - OSCILLATOR The oscillator section consists of a 555 timing circuit, resistors R13, R14, and capacitor C3. The 555 IC is configured as an astable or free-running oscillator. The values of the resistor R14 and capacitor C3 set the output frequency at 8Hz. The IC will produce a continuous 8Hz square wave from pin 3 as long as it is powered.
  • Page 11 PARTS LIST - SECTION C Qty. Symbol Description 680kW 5% 1/4W 1.2MW 5% 1/4W Qty. Symbol Value .001mF Qty. Symbol Value 4017 Qty. Symbol Description Socket IC 16-pin Resistor ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD In all of the following 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.
  • Page 12 SECTION C - STEP PULSES WITH COUNTER In this section, a 4017 counter IC and a 40106 inverter IC are used to control eight electronic switches. A short positive pulse must be generated and applied to the clock input of the 4017 IC whenever switch SW1 is depressed.
  • Page 13 PARTS LIST - SECTION D Qty. Symbol Description R1-R8 200W 5% 1/4W Qty. Symbol Value 470mF 16V Qty. Symbol Value 16 D1-D16 U2, U3 74HC4066 Qty. Symbol Description F-Connector Modular Jack RJ-45 Spacer U2, U3 IC Socket 14-pin Resistor F-Connector SECTION D Switches and LED Indicator RESISTORS...
  • Page 14 ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD In all of the following 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. R6 - 200W 5% 1/4W Resistor (red-black-brown-gold) (see Figure A)
  • Page 15 ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD (cont.) Spacer (see Figure M) D9 - LED D10 - LED D11 - LED D12 - LED D13 - LED D14 - LED D15 - LED D16 - LED (see Figure N) Figure M Mount the spacer to the PC board as shown.
  • Page 16 SECTION D - SWITCHES AND LED INDICATOR In this section, two quad analog switches (74HC4066) and 16 LEDs are used to indicate which pins are being tested and the type of cable. Figure 8 shows the logic diagram for each switch. Each switch contains an input, output and a control pin.
  • Page 17 PARTS LIST - SECTION E Symbol Value D1-D4 1N4148 Symbol Description PC Board Terminator LD-100 F-Connector Modular Jack RJ-45 F-Connector ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD In all of the following 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.
  • Page 18 SECTION E - TERMINATOR The terminator uses four diodes to identify the polarity of the input signals. The diodes are placed in series with wires 1-8, 2-7, 3-6, and 4-5 (see Figure 11). PARTS LIST - SECTION F Qty. Symbol Description Plug RJ-45 2’...
  • Page 19 For testing and troubleshooting the tester, you need to assemble straight and cross-pinning cables. For cutting, stripping, and crimping, use a standard tool for RJ-45 plugs (flat cable). Elenco Electronics has modular crimping tools Models ST-500 and HT-568. Straight Cable Cross-Pinning Cable Cut the 2’...
  • Page 20 PARTS LIST - SECTION G Qty. Symbol Description F to BNC Adapter Button Cap Case Top Tester Case Top Terminator Case Bottom Tester Case Bottom Terminator Cover Battery Velcro Hook and Loop Set Screw #4 5/16” AB Phillips Pan Head Screw 3 x 12mm Thread Cutting Phillips Flat Head Screw M3 x 10mm Machine Phillips Flat Head Screw 2.6 x 10mm Thread Cutting Phillips Flat Head...

  • Page 21: Section G - Final Test

    SECTION G - FINAL TEST Straight Cable 1. Connect one end of the straight cable to the modular jack on the PC board of the terminator and the second end to the PC board of the cable tester as shown in Figure 16a. 2.
  • Page 22 SECTION G - FINAL ASSEMBLY OF TESTER Push the button cap onto the switch as shown in Figure O. Mount the PC board to the top case, as shown in Figure P, with two #4 5/16” phillips screws. Note: The button cap should be centered in the top case hole.
  • Page 23 FINAL ASSEMBLY OF TESTER (cont.) Insert the M3 x 10mm machine phillips screw into the battery cover hole, as shown in Figure S, and tighten. M3 Phillips Screw Figure S FINAL ASSEMBLY OF TERMINATOR Before assembling, check that the excess leads from the F-connector are cut off (see page 16).

  • Page 24: Specifications

    FINAL ASSEMBLY (cont.) Peel off the two backings, and attach the two velcro pieces onto the terminator and the tester in the location shown in Figure W. Figure W SPECIFICATIONS CATEGORY OF CABLE • Unshielded communication cable with RJ-11 and RJ-45 connectors.
  • Page 25 OPERATION INSTRUCTIONS 1. Connect one end of the cable to be tested to the terminator and the other end to the cable tester as shown in Figure 17. 2. Push the TEST (power) button and read the result. Good Pair: Two vertical and one single blinking LEDs.

  • Page 26: Wiring Schemes

    WIRING SCHEMES Ethernet 10Base-T 8-Position Token Ring RJ-11 (4-Wire) Straight-Pinning (Y) 1 (G) 2 (R) 3 (BL) 4 NOTE: Cross-Pinning is for typical telephone use. RJ-11 (6-Wire) Straight-Pinning (BL) 1 (Y) 2 (G) 3 (R) 4 (BK) 5 (W) 6 RJ-45 (8-Wire) Straight-Pinning (BL) 1 (OR)2...

  • Page 27: General Maintenance

    MAINTENANCE GENERAL MAINTENANCE To clean, wipe the case with a damp cloth and detergent (do not use abrasives or solvents). When the Lo Batt. LED lights up, you need to replace the battery. The terminator does not use a battery. BATTERY REPLACEMENT The tester is powered by a single standard or alkaline 9V battery.
  • Page 28 Elenco Electronics, Inc. 150 W. Carpenter Avenue Wheeling, IL 60090 (847) 541-3800 www.elenco.com e-mail: elenco@elenco.com...

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