Elenco Surface Mount Generator Kit - Manual (Page 12)

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TROUBLESHOOTING GUIDE
A) NO SINE/TRIANGLE OR SQUARE WAVE OUTPUT
1) Check the soldering on switch S3.
2) Check the soldering on IC U1.
3) Check for +9V on IC1 pin 4.
4) Check that U1 is not installed backwards.
5) Check all of the values and soldering on R1, R2, R3, R4, R5, R7, R8, R9, C8, and C9.
B) WRONG FREQUENCY ON ANY RANGE SETTING
1) This indicates a wrong value capacitor in the bad range position.
C) SINE/TRIANGLE SWITCH DOESN’T WORK
1) Check the soldering on switch S2 and R6.
2) Check the value of R6.
D) AMPLITUDE CONTROL DOESN’T WORK
1) Check the soldering on R3, R7, R8, R4 and R9.
2) Check the values of the above mentioned components.
E) FREQUENCY CONTROL DOESN’T WORK
1) Check the soldering on R1 and R2.
2) Check the values of the above two resistors.
1) SET THE SWITCHES AND POTS AS
FOLLOWS:
On/Off On
Range 10
Frequency Maximum (clockwise)
Amplitude Maximum (clockwise)
Sine/Triangle Set Sine/Triangle switch to
Sine position
In each of the following steps, start with the switch
and pots as shown above.
2) OUTPUT WAVEFORMS
Connect an oscilloscope probe to the square wave output.
You should see about 8V peak to peak square wave of a
little over 15Hz. Connect the oscilloscope probe to the
sine/triangle wave output. You should see a sine wave of
approximately 3V peak to peak or greater. Set the
Sine/Triangle switch to the Triangle wave position. You
should see a triangle waveform of approximately 3V peak
to peak or greater. In both sine and triangle waves, the
frequency is also a little over 15Hz.
3) FREQUENCY CONTROLS
6 range settings, vary the FREQUENCY pot from
max to min and check that the frequency varies
according to Table 1 on page 13.
4) AMPLITUDE CONTROLS
Set the switch and pots as in Step 1. Connect the
oscilloscope to the sine/triangle wave output and
vary the AMPLITUDE pot. The sine wave amplitude
should vary from near zero to approximately 3V peak
to peak or greater.
TESTING THE FG-600 FUNCTION GENERATOR
The unit may be tested by following the 4 steps listed below. Should any of these tests fail, refer to the
Troubleshooting Guide below.