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VOLTAGE ANALYSIS OF ANALOG SECTION
Proceed with the voltage analysis only if the resistance readings were satisfactory. The values given below
are approximate.
The following measurements will be taken from the copper side of the PC board. Turn the unit on and place it
upside down.
See Figure J for locations of the testing points.
From
To
Pin 4 (U6)
GND (B1)
Pin 12 (U6)
GND (B1)
Pin 7 (U10)
GND (B1)
Pin 4 (U10)
GND (B1)
U6
1
16
15
2
3
14
13
4
12
5
11
6
7
10
8
9
U10
GND
1
8
2
7
3
6
4
5
Turn unit right side up.
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
breadblock marked GND.
3. Set the WAVEFORM knob to SINE, COARSE FREQUENCY knob to 1k and the FINE ADJ and AMPLITUDE
knobs fully clockwise.
4. Set the DC offset to the middle position. Then, turn on the trainer.
Circuit
Volts
U6 Vcc
+12V
U6 GND
–12V
U10 Vcc
+12V
U10 Vcc–
–12V
12
7
Figure J
-32-
Volts Measured
4
4
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