Elenco Electronics XK-550K Assembly And Instruction Manual Download Page 18 | Manualshive

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VOLTAGE ANALYSIS OF POWER SUPPLY

Proceed with the voltage analysis only if the resistance readings were satisfactory.

Place the top panel on the unit. If any capacitors are inserted backwards, the panel will shield you if
they explode. Make sure that the ON/OFF switch is in the OFF position. Plug the line cord into the 120VAC
power source. Turn the unit on and let it sit for a few minutes. Turn OFF the ON/OFF switch and remove the
top panel, placing it along the left side of the trainer. Turn ON the ON/OFF switch and measure the voltage point
as listed in the chart below. The values given are approximate.

See Figure V for locations of the testing points.

From

To

Circuit

Volts

Volts Measured

15

GND

+12V Regulator Input

+21V

B3

GND

+12V Regulator Output

+12V

16

GND

-12V Regulator Input

-21V

B2

GND

-12V Regulator Output

-12V

17

GND

+5V Regulator Input

+12.5V

B4

GND

+5V Regulator Output

+5V

18

GND

+20V Regulator Input

+28V

25

GND

Voltage ADJ +20V Regulator

CCW 0V CW +18V

+20

5 pin connector

GND

+20V Output

CCW +1.25V CW +20V

19

GND

-20 Regulator Input

-28V

26

GND

Voltage ADJ -20V Regulator

CCW 0V CW -18V

-20

5 pin connector

GND

-20V Output

CCW -1.25V CW -20V

15VAC

15VAC

30VAC

30VAC

5-pin

5-pin

connector

connector

left

right

«
«

«
«

«

+30%

CCW - Counter-Clockwise CW - Clockwise

r

Turn unit off.

-17-

FUSE REPLACEMENT

1. Turn the trainer off and unplug it from 120VAC power source.

2. Unscrew fuse holder cap and remove fuse.

3. Use only a 1.25A fuse. Larger fuses or other fuse bypass will void the war-

ranty of the trainer.

4. Place the new fuse into the fuse holder cap and screw it back into the holder.

5. Plug trainer into 120VAC power source and turn the unit on.

Place the top panel on top of the unit.

«
...
16
17
18
19
20
...
»

Summary of Contents for XK-550K

Page 1: ...K A COMPLETE MINI LAB FOR BUILDING TESTING AND PROTOTYPING ANALOG AND DIGITAL CIRCUITS Elenco Electronics Inc Copyright 1995 Elenco Electronics Inc Revised 1999 REV F 753550K Tools and meter shown not included Assembly Instruction Manual ...

Page 2: ...14554 r 4 Knob 622009 r 1 Case 623002 r 1 Bushing 624009 r 1 Spacer Nylon 7 16 x 3 16 Tap 624013 r 1 Connector Receptacle 626020 r 1 Connector Plug 626021 r 1 Cord Retainer 628003 r 9 Screw 4 40 x 1 4 Slotted 641430 r 1 Screw 4 40 x 1 4 Phillips 641431 r 8 Screw 6 32 x 5 16 Slotted 641641 r 2 Screw 8 32 x 3 8 Phillips 641840 r 2 Screw 4 x 1 4 Phillips AB 642430 r 4 Screw 8 x 1 2 Phillips AB 642862...

Page 3: ...lue is 10 x 1 000 10 000pF or 01µF The letter K indicates a tolerance of 10 The letter J indicates a tolerance of 5 For the No 0 1 2 3 4 5 8 9 Multiply By 1 10 100 1K 10K 100K 01 0 1 Multiplier Note The letter R may be used at times to signify a decimal point as in 3R3 3 3 IDENTIFYING RESISTOR VALUES Use the following information as a guide in properly identifying the value of resistors BAND 1 1st...

Page 4: ...ed must be heated sufficiently so that the solder flows freely Apply the solder simulta neously to the component lead and the component pad on the PC board so that good solder flow will occur Be sure that the lead extends through the solder smoothly indicating a good solder joint Use only rosin core solder of 60 40 alloy DO NOT USE ACID CORE SOLDER Do not blob the solder over the lead because this...

Page 5: ...ng control makes the selection of any frequency easy The output voltage amplitude is vari able between 0 to 15Vpp The output impedance is approximately 330 ohms DIGITAL TRAINER SECTION The digital trainer has the necessary functions to do your digital experiments They consist of a clock genera tor two no bounce switches eight LED indicator lamps and eight data switches POWER SUPPLY SPECIFICATIONS ...

Page 6: ...Washer Figure C Mount down flush with PC board The value may be marked on the on the back side of pot Cut off excess lead length after sol dering Figure D Bend the capacitor at a 45o angle before soldering Cut off excess leads Cut off tab Figure A Mount the connector as shown and solder the pins of the connector PC Board r S1 5 Pin Connector see Figure A r L Bracket see Figure B r VR4 100KΩ Pot r ...

Page 7: ...mount them with the lead in the correct hole as marked on the PC board Mount the capacitor lying flat on the PC board as shown below r C11 100µF 25V see Figure E r R1 120Ω 5 1 4W Resistor brown red brown gold r C6 1µF Mylar 104 see Figure D r J28 Jumper Wire see Figure F r J6 Jumper Wire see Figure F r D12 1N4001 Diode r D11 1N4001 Diode see Figure G r C14 100µF 25V Lytic r C17 100µF 25V Lytic see...

Page 8: ...ks in place as shown Plastic Pins Melt Pins r VR1 2KΩ Pot r VR2 2KΩ Pot see Figure C r B1 4 Pin Bredblox r B2 4 Pin Bredblox r B3 4 Pin Bredblox r B4 4 Pin Bredblox see Figure H r C12 100µF 25V Lytic see Figure E r J26 Jumper Wire r J7 Jumper Wire see Figure F r D15 1N4001 Diode r D14 1N4001 Diode r D13 1N4001 Diode see Figure G r C15 100µF 25V Lytic r C16 100µF 25V Lytic see Figure E r J4 Jumper ...

Page 9: ...RT HERE ê Top Right Corner of PC Board Leftover wire will be used in future sections Band r C1 1000µF 35V Lytic r C5 1000µF 35V Lytic see Figure I r C2 1000µF 35V Lytic r C4 1000µF 35V Lytic see Figure I r C3 2200µF Lytic Mount on foil side of PC board Note the polarity see Figure I r D1 1N4001 Diode r D2 1N4001 Diode r D3 1N4001 Diode r D4 1N4001 Diode r D5 1N4001 Diode r D6 1N4001 Diode r D7 1N4...

Page 10: ...four 4 40 x 1 4 screws see Figure K Do not tighten the screws r Place the top panel on top of the unit Push the PC board up until the com ponents come through the top panel and tighten the screws Adjust the PC board height with a 4 40 x 1 4 screw Figure KA Note From the foil side of the PC board inspect the edges to be sure that there are no component leads shorting against the side panels Figure ...

Page 11: ...e side panel Solder the pins of the ICs to the PC board r U3 LM7805 r U1 LM317 r U5 LM337 10 Mount the solder lug to the panel as shown in Figure N using a 6 32 x 5 16 screw and 6 32 nut r Solder Lug 6 23 Nut IC Silicone Grease Mica Side Panel Insulator Washer 6 32 x 5 16 Screw Take a small amount of silicone grease from the packet and apply it with a toothpick onto the back of the ICs Mica Figure...

Page 12: ...d U4 to the right side panel as shown in Figure O Insert the pins of each IC into the holes in the PC board Then with the hardware shown in Figure MA attach each IC to the side panel Solder the pins of the ICs to the PC board r U4 LM7912 r U2 LM7812 Mount the transformer with the black wires as shown in Figure O Use the two 8 32 x 3 8 screws 8 lockwashers and 8 32 nuts r Transformer mounted Right ...

Page 13: ... that the pin is inserted all the way in It should not pull out of the housing The locking tabs should be bent outward to hold the pin in the housing TRANSFORMER WIRES 1 Strip the insulation off of each of the black primary wires to expose 1 4 of bare wire 2 Place the wire onto the male pin and crimp the outer crimp tabs with pliers over the insulation as shown in Figure 3A 3 Crimp the inner tabs ...

Page 14: ...crew into the hole in the raised area from the top side of the panel see Figure S r When mounting the bredboard use the holes shown in Figure Ta Mount the plastic spacer with a 4 40 x 1 4 flat head screw as shown in Figure S Next mount the bredboard with two 4 x 1 4 AB black screws from the back side of the top panel as shown in Figure S The negative blue stripe should be on top and the numbers re...

Page 15: ...er piece of shrink tubing r Cut the 2 section of 3 16 diameter shrink tubing in half to create two 1 sections Slide a 3 16 diame ter piece of shrink tubing over the loose end of the red wire Attach the red wire to lug 1 on the switch and then solder into place r Pass the black transformer wire labeled B through a 3 16 diameter piece of shrink tubing Attach the wire to lug 2 on the switch and then ...

Page 16: ...n 1 4KΩ 27 GND 5 pin connector 5V Regulator GND less than 1Ω 28 GND 5 pin connector 12V Regulator GND less than 1Ω 29 GND 5 pin connector 12V Regulator GND less than 1Ω 10 15 12V Regulator Input less than 1Ω 11 16 12V Regulator Input less than 1Ω 12 17 5V Regulator Input less than 1Ω 13 18 Variable Regulator Input less than 1Ω 14 19 Variable Regulator Input less than 1Ω 20 GND 5 pin connector Vari...

Page 17: ...connector left 5 pin connector 20 5 pin connector right 5 pin connector 20 GND Ground 29 16 24 15 28 23 9 8 7 6 5 4 10 11 12 13 14 20V Pot 20V Pot Plug of line cord 1 3 2 Figure O B1 LM 7812 LM 7912 LM 7805 LM 317 LM 337 On test points 4 14 use the leads of the diodes ...

Page 18: ...12V Regulator Output 12V 16 GND 12V Regulator Input 21V B2 GND 12V Regulator Output 12V 17 GND 5V Regulator Input 12 5V B4 GND 5V Regulator Output 5V 18 GND 20V Regulator Input 28V 25 GND Voltage ADJ 20V Regulator CCW 0V CW 18V 20 5 pin connector GND 20V Output CCW 1 25V CW 20V 19 GND 20 Regulator Input 28V 26 GND Voltage ADJ 20V Regulator CCW 0V CW 18V 20 5 pin connector GND 20V Output CCW 1 25V ...

Page 19: ...e the 25Ω 10 watt resistor across the output terminal The voltage should stay within 20 volts of the no load volt age TROUBLESHOOTING CHART This chart lists the condition and possible causes of several malfunctions If a particular part is mentioned as a possible cause check that part to see if it was installed correctly Also check it and the parts connected to it for good solder connections Note T...

Page 20: ...ith load 1 Check capacitor C2 1000µF is inserted in the correct polarity 2 Check ripple on pin 1 of U2 7VP P Max A Capacitor C2 or diodes D1 D3 defective No 12V at output 1 Measure an AC voltage of 15VAC at anode of D2 D4 A Transformer and or secondary connection to PC board defective 2 Measure for a DC voltage of 21VDC at pin 2 of U4 LM7912 A Diodes D2 D4 in backwards or defective check capacitor...

Page 21: ... PC board in the location shown in Figure X r Fasten the pots to the front panel with an 8mm washer and a 7mm nut as shown in Figure W r Turn the shafts on the two switches fully counter clockwise Push the knobs onto the shafts so that the line on the knob is in line with the end of the circle on the front panel see Figure Y If the knob is loose on the shaft insert a screwdriv er into the slot and...

Page 22: ... open up the slot press down on one side of the slot see Figure BB Insert the bushing into the hole and pull on the line cord until the knot is snug against the bushing r Insert the unit into the case at a 45O angle bottom edge first Secure into place with four 6 x 3 8 chrome screws in the corner holes of the panel r The line can be neatly stored in the bin shown in Figure AA Gather up the line co...

Page 23: ... only one direction The arrow in Figure 3 points to the direction that the current will flow Only when the transformer voltage is positive will current flow through the diodes Figure 3 shows the simplest possible rectifier circuit This cir cuit is known as a half wave rectifier Here the diode conducts only half of the time when the AC wave is positive as shown in Figure 2C Use of this circuit is s...

Page 24: ...ransistor Q5 is called the pass transistor It controls the current reaching the output Transistor Q3 and Q4 are emitter followers Their function is to raise the impedance of the pass tran sistor Note that transistors Q2 Q3 Q4 Q5 and resistor R1 form a closed loop Also note that the feedback to the base of Q2 is negative that is when the base of Q2 goes positive the output at emitter Q5 goes nega t...

Page 25: ... 24 SCHEMATIC DIAGRAM POWER SUPPLY SECTION 1 2 3 8 4 10 11 6 7 12 5 9 13 14 18 20 25 19 21 26 17 22 27 15 23 28 16 24 29 Test Point REV E 25V 2200µF ...

Page 26: ...moothed by using a r A half wave rectification circuit r B small value capacitor with a high voltage value r C Large value capacitor r D 90O out of phase 6 An inefficient rectification circuit usually contains r A large gaps between cycles r B twice the AC voltage needed r C more diodes r D all of the above 7 The maximum current that a diode can handle is determined by r A the transformer s curren...

Page 27: ...0 r 1 VR5 10KΩ POT 192531 r 2 VR6 VR7 100KΩ POT 192612 CAPACITORS QTY SYMBOL VALUE DESCRIPTION PART r 1 C27 5pF 5 Discap 205010 r 1 C26 22pF 22 Discap 212210 r 1 C23 100pF 101 Discap 221017 r 1 C18 001µF 102 Mylar 231017 r 1 C25 0022µF 222 Discap 232216 r 1 C19 01µF 103 Mylar 241017 r 1 C20 1µF 104 Mylar 251017 r 1 C21 1µF 50V Electrolytic 261047 r 2 C22 C24 10µF 25V Electrolytic 271045 SEMICONDUC...

Page 28: ...uare triangle and complementary square Frequency 1Hz to 100kHz in 5 steps continuously variable Fine frequency adjust 10 1 approximate Amplitude variable 0 15 Vpp Output impedance 330 ohms short protected DC offset change 10V from zero crossing USERS DESCRIPTION OF FRONT PANEL CONTROLS 1 WAVEFORM Selects square triangle or sine waveform at the FREQ output 2 COURSE FREQUENCY Selects five ranges of ...

Page 29: ...ngles and then insert the leads into the PC board Polarity Mark Flat r J9 Jumper Wire see Figure A r C25 0022µF 222 Discap r J10 Jumper Wire r J25 Jumper Wire see Figure A r VR8 100KΩ Trim Pot see Figure E r C26 22pF 22 Discap r C23 100pF 101 Discap r J11 Jumper Wire r J12 Jumper Wire r J13 Jumper Wire see Figure A r U10 8 pin IC socket r U10 LF357 IC see Figure B r R8 51KΩ 5 1 4W Resistor green b...

Page 30: ...own on the PC board Plastic Pins Melt Pins 29 Band r B6 4 pin Bredblox see Figure F r D16 1N4148 Diode see Figure G r R14 100Ω 5 1 4W Resistor brown black brown gold r B5 4 pin Breadblox see Figure F r R12 1KΩ 5 1 4W Resistor brown black red gold r R44 100Ω 5 1 4W Resistor brown black brown gold r D17 1N4148 Diode see Figure G r J23 Jumper Wire see Figure A r R48 22KΩ 5 1 4W Resistor red red orang...

Page 31: ... ê Cut off tab Cut off tab r J18 Jumper Wire see Figure A r R13 8 2KΩ 5 1 4W Resistor gray red red gold r J17 Jumper Wire see Figure A r C18 001µF 102 Mylar see Figure EA r R6 12KΩ 5 1 4W Resistor brown red orange gold r VR6 100KΩ Pot see Figure H r VR5 10KΩ Pot see Figure H r VR7 100KΩ Pot see Figure H r SW2 SW Rotary 12 Pin see Figure I r SW3 SW Rotary 16 Pin r C21 1µF 50V Electrolytic see Figur...

Page 32: ... Pin 3 U10 Triangle Wave VR5 CCW 14 7KΩ Pin 2 U6 Pin 3 U10 Triangle Wave VR5 CW 4 7KΩ Pin 13 U6 Pin 14 U6 Triangle Wave Greater than 1KΩ SET SW3 TO SINE WAVE From To Circuit Ohms Resistance Measured Pin 2 U6 Pin 3 U10 Sine Wave VR5 CCW 14 7KΩ Pin 2 U6 Pin 3 U10 Sine Wave VR5 CW 4 7KΩ Pin 13 U6 Pin 14 U6 Sine Wave 200Ω Pin 3 U6 GND B1 Mult VR8 CCW 10Ω Pin 3 U6 GND B1 Mult VR8 CW 100KΩ Pin 4 U6 12V ...

Page 33: ...ND 12V Pin 7 U10 GND B1 U10 Vcc 12V Pin 4 U10 GND B1 U10 Vcc 12V TESTING THE FUNCTION GENERATOR Note Use the knobs when turning the switches TESTING THE SINE WAVE 1 Set your meter to the 200mV DC range 2 Connect the red meter lead to the 4 pin breadblock marked FREQ and the black lead wire to the 4 pin bread block marked GND 3 Set the WAVEFORM knob to SINE COARSE FREQUENCY knob to 1K and the FINE ...

Page 34: ...talled correctly Also check it and the parts connected to it for good solder connections PROBLEM POSSIBLE CAUSE No wave form at FREQ 1 Check voltage at pins 4 12V and 12 12V of U6 2 Check for wave forms at pin 2 of U6 and pin 3 of U10 A Check R3 4 R7 R13 C18 22 C24 SW2 3 VR5 VR7 3 Measure voltage at pins 7 12V and 4 12V of U10 4 Check R8 R9 R11 R14 R44 48 D16 D17 Q1 and Q2 No sine triangle or low ...

Page 35: ...s onto the shafts so that the line on the knob is in line with the Squarewave on the waveform control and 10 on the Coarse Frequency control see Figure M If the knobs are loose on the shafts insert a screw driver into the slot and expand the slot slightly see Figure O r Turn the shafts on the pots fully counter clockwise Push the knobs onto the shafts so that the line on the knob is in line with t...

Page 36: ...creasing the current of the VCO will effect the r A amplitude r B DC offset r C AM modulation r D frequency 3 The RC time constant is determined by r A pins 5 and 6 r B voltage controlled oscillator r C pin 7 and a variable resistor r D components on pins 5 6 and 7 4 What pins on the 2206 IC are used to change the sine wave to a saw wave r A 5 6 r B 15 16 r C 13 14 r D 4 12 5 Adjusting P4 from 12V...

Page 37: ...SCHEMATIC DIAGRAM ANALOG SECTION 36 ...

Page 38: ...Bredblox 99426 INTRODUCTION The Digital Section is the fourth package of the XK 550K kit that you are building The Digital Section of your trainer contains all of the necessary functions to do your digital designs They consist of a clock generator two no bounce logic switches 8 LED indicator lamps and 8 data switches We have also added a 730 tie point Bredblox to your already existing 830 tie poin...

Page 39: ...Give one signal state change per move ment of switch 3 INPUT TERMINALS FOR LOGIC INDICATOR LEDs A input corresponds with A lamp etc 4 LOGIC INDICATORS Eight LEDs 5 EIGHT DATA SWITCHES Lets output of 5V or 0V depending on position 6 OUTPUT TERMINAL For all functions as stated 4 pins per block 7 BREDBOARD One bredboard containing 730 tie points 1 2 3 4 5 6 7 ...

Page 40: ...wn black yellow gold r R30 100KΩ 5 1 4W Resistor brown black yellow gold r R31 100KΩ 5 1 4W Resistor brown black yellow gold r R29 100KΩ 5 1 4W Resistor brown black yellow gold r R26 100KΩ 5 1 4W Resistor brown black yellow gold r R20 100KΩ 5 1 4W Resistor brown black yellow gold r R22 100KΩ 5 1 4W Resistor brown black yellow gold r R24 100KΩ 5 1 4W Resistor brown black yellow gold r R21 100KΩ 5 1...

Page 41: ...5 1 4W Resistor brown red brown gold r S5 4 pin connector see Figure A r R41 120Ω 5 1 4W Resistor brown red brown gold r R40 120Ω 5 1 4W Resistor brown red brown gold r R39 120Ω 5 1 4W Resistor brown red brown gold r R38 120Ω 5 1 4W Resistor brown red brown gold r S4 4 pin connector see Figure A r R37 120Ω 5 1 4W Resistor brown red brown gold r R36 120Ω 5 1 4W Resistor brown red brown gold ...

Page 42: ... 74HC04 IC see Figure D r U8 14 pin IC Socket r U8 74HC04 IC see Figure D r J19 Jumper Wire see Figure C r R15 220Ω 5 1 4W Resistor red red brown gold r J22 Jumper Wire see Figure C r J21 Jumper Wire see Figure C r J20 Jumper Wire see Figure C r R18 1KΩ 5 1 4W Resistor brown black red gold r U7 14 pin IC socket r U7 7403 IC see Figure D r J24 Jumper Wire see Figure C r D25 LED and Spacer see Figur...

Page 43: ...n to hold the plastic blocks in place as shown Figure F Mount the switch onto the legend side of the PC board as shown Flip the board over and solder the part into place Be sure to keep the three sol dered sets of leads separate as shown Plastic Pins Melted Pins Switch Legend side of PC board Foil side of PC board Solder Note The 9418 and the power strip 9408 make up the 9426 bredboard r SW4 Slide...

Page 44: ... GND In down position less than 1Ω SW8 GND In down position less than 1Ω SW1 GND In up position greater than 3KΩ SW2 GND In up position greater than 3KΩ SW3 GND In up position greater than 3KΩ SW4 GND In up position greater than 3KΩ SW5 GND In up position greater than 3KΩ SW6 GND In up position greater than 3KΩ SW7 GND In up position greater than 3KΩ SW8 GND In up position greater than 3KΩ SW1 5V ...

Page 45: ... position 5V SW6 GND In up position 5V SW7 GND In up position 5V SW8 GND In up position 5V X GND In down position less than 1V X GND In down position 5V Y GND In down position less than 1V Y GND In down position 5V SW1 GND In down position less than 1V SW2 GND In down position less than 1V SW3 GND In down position less than 1V SW4 GND In down position less than 1V SW5 GND In down position less tha...

Page 46: ...s to be checked The output of the switches are 5V or ground depending on the position Connect a wire to the SW1 test pin and the A test pin The A LED should light when the switch is placed toward the top of the case Repeat the same test on SW2 SW3 SW4 SW5 SW6 SW7 and SW8 r Unplug the unit from the AC outlet DIGITAL TROUBLESHOOTING CHART PROBLEM POSSIBLE CAUSE No 5V on data switch terminals 1 Measu...

Page 47: ...wave on the waveform control and 10 on the Coarse Frequency control see Figure K If the knobs are loose on the shafts insert a screwdriver into the slot and expand the slot slightly see Figure M r Turn the shafts on the pots fully counter clockwise Push the knobs onto the shafts so that the line on the knob is in line with the end of the circle on the front panel as shown in Figure L If the knobs ...

Page 48: ... the line cord until the slot is snug against the bushing r Insert the unit into the case at a 45O angle with the bottom edge first Secure the unit into place with four 8 x 1 2 black screws in the corner holes of the panel r The line can be neatly stored in the bin shown in Figure N Gather up the line cord and insert it into the bin Insert the line cord fastener into the slots to the hole in place...

Page 49: ...s bounce This is extremely important if you are producing pulses for counting circuits Figure R shows the wiring of the logic switch The two NAND gates are connected so that when the X input is grounded the X output goes high Opening and closing the ground at X will not change the output Only when X is grounded will the output change to low Thus only one output change is produced with one movement...

Page 50: ...SCHEMATIC DIAGRAM 49 ...

Page 51: ... high r D all of the above 5 The logic switches use r A single pole single throw switches r B double pole double throw switches wires as single pole double throw switches r C two pole 5 position rotary switches r D 4 pole 3 position rotary switches 6 The 100KΩ resistor on the logic indicator input r A divides the input voltage in half r B bias the input to 5V r C bias the input to GND r D turn on ...

Page 52: ...Elenco Electronics Inc 150 W Carpenter Ave Wheeling IL 60090 847 541 3800 Web Site http www elenco com e mail elenco elenco com ...

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