ELECTRONICS TROUBLESHOOTING

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Amplifier 2 Troubleshooting

 

The Scope shows the output of a good and a bad amplifier (shown above) when the 1khz input signal is stepped thru 2mV, 4mV and 6mv.  The first three frames show the output of the good circuit and the next three frames show the output of the bad circuit, the next frame shows a flat line (scope input grounded) display.


.5 V per division vertical sensitivity 

Select a possible component failure:

A. Transistor Base to Emitter open.
B.  4.73k ohm resistor's resistance increased.
C.  270 ohm resistor's resistance increased.
D.  10.0k ohm resistor's resistance increased.

Answer Below

 

 

 

 

Answer Below

 

 

 

 

Answer Below

 

ANSWER!

C.  270 ohm resistor's resistance increased to 273 ohms.