Elenco Electronics XK-700K Assembly And Instruction Manual page 32

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 12.3k
Square Wave VR5 CW 6.7k
Circuit Ohms
Triangle Wave VR5 CCW 14.7k
Triangle Wave VR5 CW 4.7k
Triangle Wave Greater than 1k
Circuit Ohms
Sine Wave VR5 CCW 14.7k
Sine Wave VR5 CW 4.7k
Sine Wave 200
Mult VR8 CCW < 10
Mult VR8 CW 100k
VCC Less than 3
Fine Freq Adj VR7 CCW 108.2k
Fine Freq Adj VR7 CW 8.2k
GND Less than 3
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