TESTING THE SIX TRANSISTOR RADIO COMPONENTS

TESTING THE SIX TRANSISTOR RADIO COMPONENTS

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TESTING THE SIX TRANSISTOR RADIO COMPONENTS

OPEN RELATIONSHIP TESTING THE SIX TRANSISTOR RADIO COMPONENTS,
Testing the open relationship of each six transistor radio component is a process of activity to find out the pros and cons of ...

TESTING THE SIX TRANSISTOR RADIO COMPONENTS

OPEN RELATIONSHIP TESTING THE SIX TRANSISTOR RADIO COMPONENTS,
Testing the open relationship of each six transistor radio component is a process of activity to find out the pros and cons of the six transistor radio components. This test is carried out in an open manner, meaning that the component legs are removed, not connected to other component legs. This is done to get the right test results, because a component is not influenced by other components.
Before all superheterodyne radio components are installed on the PCB, you should test all of these components using an ohmmeter. It is intended to know for sure that the components installed are in good condition, so that you don't encounter many difficulties at the end of the practice.
The components for making a superheterodyne radio can be grouped into ten.
1. Fixed resistors.
2. Ceramic capacitor.
3. Electrolytic capacitor.
4. Diodes.
5. Potentiometer.
6. Transformer.
7. Transistors.
8. Antenna spool.
9. Non-fixed capacitor (Varco).
10. Loudspeaker.

 

testing the six transistor radio components

The steps and the possible results of testing all the six transistor radio components are the same as described in the previous chapter in this book, namely in Chapter 3 Testing Three Transistor Radio.

TESTING THE SIX TRANSISTOR RADIO GROUNDING,

Crime activity applies when the radio is ringing or can pick up radio waves. During practice, if you meet a failure then the step taken is to measure the voltage of all parts of the six transistor radio. This process of activity is called a six transistor radio grounding test.
This step is more efficient and practical because it can work systematically. Tidal (allowed to remove components that are actually still good. The steps for testing the six transistor radio grounding are the source of electric current; the final amplifier, sound amplifier, MF / IF amplifier, and converter.

Source Voltage
Testing the grounding of the voltage source in a simple way, a small bulb can be used to determine whether or not the battery is functioning as a voltage source. A non-functioning battery, should not be used. In a forced state, test the voltage source with a DC voltmeter on a scale of 10 if the available voltage is still less than 50% of the voltage that should be. However, testing this voltage source will result in poor sound or defects.
Final Booster

a. Simple Way
1) Power supply (PSU) 6 volts is in a state of being enabled (on).
2) Correct the base legs of TR1 and TR, (D 467) with the tip of a screwdriver until the LS sounds "crack ... crack". To increase the sound, the left hand holds the pole (+) screwdriver.
3) If you don't hear a "crack" sound, it means this section is not working. Re-examine the circuit, there may be a queue or wrong pair of loose components.

b. Measuring Voltage

If the simple method does not work even though the installation of the components is correct, then the voltage measurement is carried out using a 10 scale DC voltmeter.
Step: connect the black wire to the pole (-) and connect the red wire in turns with legs B, K and E of transistors TR1 and TR2 (D 467).

how to test the grounding of the final amplifier section

Record the measurement results of each leg of the transistor, then match it with Table 6.1 below!
Table 6.1 Final Amplifier Voltage Measurement Using 10 Scale DC Voltmeter
Dhalat $ 1glan which r Basil Measurement Keter
1. VE (emitter voltage). Red: leg E Black: voltage (-)
a. 0.6 - 1 V
b. 0 Volt
c. 5.5 V

a. Good circuit
b. Emitter resistor (RE) R1 disconnects
c. The transistor is leaking

2. VB (Base voltage) Red: B leg Black: voltage (-)
a. 0.6-1V
b. 0 V

a. Secondary winding (2 feet) of IT transformer. 181 broke up. b. R2 is broken, the transistor is shorted or damaged

3. VK (Collector voltage) Red: K leg Black: voltage (-)
a. 5.5 - 6 volts
b. 0 volts
a. Good circuit
b. IT.181 primary winding breaks
Sound Booster
a. Testing the Simple Way
The test steps are as follows.
1. Turn on the radio (potentiometer switch is in the on position).
2. Correct the base leg of TR3 (C 829), until the LS sound "krek" louder than TR1 and TR ,.
3. Hold the center leg of the potentiometer until you hear a hum.
4. If the LS does not hear a "crack" and hum, then this circuit is not working. Re-examine this sound amplifier circuit, maybe the TR3 has been damaged or the installation of the legs is reversed, there is an installation of other components that are not suitable, or maybe there is a loose line.

b. Measuring Voltage To find out which components are damaged, the voltage legs B, K and E are measured using a DC voltmeter on a scale of 10. Consider Figure 6.2. Step: Connect the black wire to the negative pole of the radio and the red wire is connected to the legs B, K and E TR3 alternately.


testing on the sound amplifier


Match the measurement results with the following Table 6.2.

Table 6.2 Measurement of Sound Amplifier Voltage with a DC Voltmeter Scale 10

No. Measured Parts Basil Measurement Remarks
1. VE (emitter voltage). Red: leg E Black: voltage (-)
a. 0.6 -1 V
b. 0 - 0.1 Volt
c. 5.5 - 6 volts

a. Good circuit

b. The emitter resistor (RE) R4 or emitter capacitor (CE) C5 breaks

b. TR ,, C829 leak 2. VK (Collector voltage) Red: legK Black: voltage (-)
a 4.5 - 6 volts
b. 0 - 1 volt

a. Good circuit b. The primary winding of transformer input 191 ends or R3 breaks

3. VB (Base voltage) Red: B leg Black: voltage (-)
a. 0.6 -1 volt
b. 0 - 0.1 volts
c. 5.5 - 6 volts

a. Good circuit b. There is a loose / loose solder. c. TR4 = leaking
Detector Detector testing can be done in a simple way with the following steps.
a. Turn on the radio (potentiometer switch is in the on position).
b. Correct the germanium diode foot or cathode IN 60 with the tip of a screwdriver, the LS will hear a fairly strong "crack" sound. If you hear a "crack" sound is weak or not heard at all, it means that this circuit is not yet functional.
c. Hold the cathode foot until you hear a hum on the LS.
d. Research the various possible causes of a malfunction of the detector such as checking the germanium diode IN 60, whether it is leaking or breaking, ceramic capacitors, resistors are dead or incorrectly installed.

Baglan MF Amplifier
a. Simple Method of Voltage Testing The steps for this test are as follows.
1. Plug in the power source and turn on the radio.
2. Correct the base leg of the TR4 and TR5 type C 829 transistors with the tip of a screwdriver so that the LS will hear a louder "crack" sound.
3. If you hear a louder "crack", it means that the amplifier circuit is not working properly. Possibilities are: TR4 and TR5 leak / die, there is a resistor or capacitor around the transistor that is leaking, incorrectly installed, or does not fit the schematic.

b. Measuring Voltage
The amount of potential difference (voltage) legs B, K and E of transistors TR4, TR5 type C 829 is measured by a DC voltmeter scale: 10 (Figure 6.3). The method is the same as the measurement of the previous transistor legs, record the measurement results, then match them with Table 6.3. If the measurement results do not match the table, it means that there is a component that is not functioning.

voltage measurement on the mf amplifier

Table 6.3 Voltage Measurement on ME Amplifier

1. Emitter voltage (VE) TR4 Red: leg E Black: voltage (-)
a. 0.6 -1 volt
b. 0 - 0.1 volts
c. 5.5 - 6 volts

a. Good circuit
b. Emitter resistor (RE) R9 or emitter capacitor CE (CE) C11 breaks.

2. Collector voltage (VK) TR 4 a. 5.5 - 6 volts b. 0 - 0.1 volts
a. Good circuit
b. MF3 primary coil (black color) is broken or there is a loose line.

3. Base voltage (VB) TR4 Red: leg B Black: voltage (-)
a. 0.6 -1 volt
b. 0 volts
c. 5.5 - 6 volts

a. Good circuit
b. There is a solder that comes off
c. The transistor is leaking

4. Emitter voltage (VE) TR5 Red: leg E Black: voltage (-)
a. 1 - 1.5 volts
b. 0 - 0.1 volts
c. 5.5 - 6 volts

a. Good circuit

b. Emitter resistor (RE) R12 broke
c. TR5 is leaking

5. Base voltage (VK) TR5 Red: K leg Black: voltage (-)
a. 5.5 - 6 volts
b. 0 - 0.1 volts

a. Good circuit b. Primary coil. MF2 white color, cut off.

6.Base voltage (VB) TR5 Red: leg B Black: voltage (-)
a. 1 - 1.5 volts
b. 0 - 0.1 volts

a. Good circuit b. There is a solder that comes off or TR5 leaks

Converter

a. Testing in a Simple Way The steps for this test are as follows.
1. Radio is turned on. Correct the base leg of the TRi (C 829) with the tip of a screwdriver until you hear a loud "crack" sound.
2. If you don't hear a loud "crack" sound, it means the circuit is not working. Research the possible causes, namely the installation of the inverted TR leg, TR, leaking or breaking.
3. There are oscillator spool legs broken, or there are other components that are dead.

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