DIODE / TRANSISTOR TESTER KIT MODEL DT-100K 99 Washington Street Melrose, MA 02176 Phone 781-665-1400 Toll Free 1-800-517-8431 Visit us at www.TestEquipmentDepot.com Assembly and Instruction Manual Elenco Electronics, Inc.
DT-100 PARTS LIST If you are a student, and any parts are missing or damaged, please see instructor or bookstore. If you purchased this diode/transistor tester kit from a distributor, catalog, etc., please contact Elenco® Electronics (address/phone/e-mail is at the back of this manual) for additional assistance, if needed. DO NOT contact your place of purchase as they will not be able to help you. RESISTORS Qty.
CONSTRUCTION Introduction • Turn off iron when not in use or reduce temperature setting when using a soldering station. The most important factor in assembling your DT-100K Diode / Transistor Kit is good soldering techniques. Using the proper soldering iron is of prime importance. A small pencil type soldering iron of 25 - 40 watts is recommended. The tip of the iron must be kept clean at all times and well-tinned.
ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD R4 - 330kΩ Resistor (org-org-yel-gold) R1 - 330Ω Resistor (org-org-brn-gold) J1 - Jumper Wire (see Figure A) R3 - 33kΩ Resistor R2 - 33kΩ Resistor (org-org-org-gold) R5 - 220Ω Resistor R6 - 220Ω Resistor (red-red-brn-gold) R9 - 47kΩ Resistor (yel-vio-org-gold) R13 - 1kΩ Resistor (brn-blk-red-gold) R8 - 18kΩ Resistor (brn-gray-org-gold) R12 - 10kΩ Resistor (brn-blk-org-gold) R7 - 5.
ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD L1 L4 L2 L5 L3 Q1 - 2N3904 Transistor (see Figure B) C1 - 10μF Electrolytic (see Figure C) Q5 - MPS A70 Transistor (see Figure B) - LED & Spacer - LED & Spacer - LED & Spacer - LED & Spacer - LED & Spacer (see Figure D) Q4 - 2N3904 Transistor (see Figure B) C3 - .01μF Capacitor C2 - .
FINAL ASSEMBLY r Install the push button switch to the front panel in the hole marked “TEST”. Fasten switch in place with the 1/4” nut. Tighten the nut with pliers (be careful not to scratch the panel). Blue r Strip the insulation off both ends of the blue wire to expose 1/4” of bare wire. Solder one end to the hole on the copper side of the PC board, as shown in Figure I. Solder the other end of the wire to a lug on the push button switch.
r Mount the front panel to the switches on the PC board using four M3 x 0.5 x 5mm screws (see Figure K). r Remove the colored boots from the four alligator clips (to remove the boots, clip the alligator clip onto a pencil and slide the boot off). Slide each boot onto the four corresponding colored wires (black boot onto black wire, etc.). M3 x 0.5 x 5mm Screws Panel r Solder an alligator clip to each wire as shown in Figure L. Slide the boots back onto the clips.
CHECKING OUT YOUR TRANSISTOR/DIODE TESTER The following is a simple procedure for testing your DT-100. If the tests fail, refer to the troubleshooting guide for help. Diode Operation: 1.) Place the switch in the diode position. Short the black and red leads together and push in the test button. The diode test LEDs should alternately go on at about a 1Hz rate. 2.) Connect the red and black leads to any good diode. Only one LED should flash identifying the red lead connection (anode or cathode).
Transistor Testing The DT-100 can measure transistors in or out of circuit. It will identify NPN or PNP by a simple adjustment. Transistor testing - Out of Circuit 1. Place switch in transistor position. 2. Place transistor in socket or attach to C, B, E leads. If collector C, base B and emitter E are not known, assume B is the center lead on small plastic transistors and C the metal case or tab on power transistors. 3. Push in test button. Adjust the base current control so that OK LED lights.
TROUBLESHOOTING GUIDE If any problems occur, first check your wiring and soldering. Keep in mind that most problems are due to poor soldering or wiring errors. Be sure that there are no solder shorts, poor connections or wiring errors. Check that the battery is connected. Be sure that the transistors are in correctly. Check the LEDs. The LED leads are hard to identify and can easily be wired backwards. The following is a guide to help solve most problems.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 -10- TestEquipmentDepot.