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RESISTANCE ANALYSIS OF ANALOG SECTION
Static testing of the analog circuits. Do not plug in the power supply into 120VAC power source until all
resistance readings check out. The values given below are approximated.
SET SW3 TO SQUARE WAVE (refer to top panel)
From
To
Pin 11 (U6)
Pin 3 (U10)
Pin 11 (U6)
Pin 3 (U10)
SET SW3 TO TRIANGLE WAVE
From
To
Pin 2 (U6)
Pin 3 (U10)
Pin 2 (U6)
Pin 3 (U10)
Pin 13 (U6)
Pin 14 (U6)
SET SW3 TO SINE WAVE
From
To
Pin 2 (U6)
Pin 3 (U10)
Pin 2 (U6)
Pin 3 (U10)
Pin 13 (U6)
Pin 14 (U6)
Pin 3 (U6)
GND (B1)
Pin 3 (U6)
GND (B1)
Pin 4 (U6)
+12V (B3)
Pin 7 (U6)
–12V (B2)
Pin 7 (U6)
–12V (B2)
Pin 12 (U6)
–12V (B2)
30%
CCW - Counter-Clockwise
Circuit
Ohms
Square Wave
VR5 CCW 12.3kΩ
Square Wave
VR5 CW 6.7kΩ
Circuit
Ohms
Triangle Wave
VR5 CCW 14.7kΩ
Triangle Wave
VR5 CW 4.7kΩ
Triangle Wave
Greater than 1kΩ
Circuit
Ohms
Sine Wave
VR5 CCW 14.7kΩ
Sine Wave
VR5 CW 4.7kΩ
Sine Wave
200Ω
Mult
VR8 CCW < 10Ω
Mult
VR8 CW 100kΩ
VCC
Less than 3Ω
Fine Freq Adj
VR7 CCW 108.2kΩ
Fine Freq Adj
VR7 CW 8.2kΩ
GND
Less than 3Ω
VR8
U10
1
2
3
4
-31-
CW - Clockwise
U6
8
1
16
15
7
2
6
3
14
13
5
4
5
12
6
11
7
10
8
9
Resistance Measured
Resistance Measured
Resistance Measured
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