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18. Using the Oscilloscope, rotate 1 kHz TONE Level Control to
obtain a 1 kHz sinewave approximately 2 Vp-p at P3301, pin 6.
19. Using Oscilloscope, confirm a 1 kHz sinewave is present at
P3301, pin 17. The amplitude of this sinewave is not criti
cal because it is partially dependent upon the 1 kHz tone
level.
20. Rotate Modulation Mode Select Switch to "FM WIDE".
21. Rotate 1 kHz TONE Level Control fully cw.
22. Using Oscilloscope, confirm a 1 kHz sinewave of approximately
7 Vp-p is present at P3301, pin 4.
23. Rotate Modulation Mode Select Switch to "FM MID".
24. Using Oscilloscope, confirm a 1 kHz sinewave of approximately
7 Vp-p is present at P3301, pin 25.
25. Using Oscilloscope, confirm the 1 kHz sinewave at P3301, pin
1 is less than 0.06 VRMS.
26. Rotate VAR TONE FREQ Thumbwheels to "1300.0" and confirm the
sinewave at P3301, pin 1 increases in amplitude to approxi
mately 2 Vp-p.
27. Rotate VAR TONE FREQ Thumbwheels to "0300.0".
28. Set 1 kHz TONE Selector Switch in "OFF" position.
29. Set VAR TONE Selector Switch in "INT MOD" position and con
firm a 300 Hz sinewave of approximately 1.8 Vp-p is present
at P3301, pins 1 and 18.
30. Verify a 300 Hz squarewave of approximately 12 Vp-p is pre-
sent at P3301, pin 24.
31. Rotate Modulation Meter Range Switch to "20".
32. Set VAR TONE Selector Switch in "OFF" position.
33. Set 1 kHz TONE Selector Switch in "INT MOD" position.
34. Rotate 1 kHz TONE Level Control for a deviation of 5 kHz as
shown on Modulation Meter.
35. Rotate Modulation Meter Range Switch to "6" and confirm the
meter indicates 5 kHz ±250 Hz.
36. Adjust 1 kHz TONE Level Control for a deviation of 1 kHz as
shown on Modulation Meter.
7-65
Summary of Contents for FM/AM-500
Page 152: ...DETAIL A 11 Figure 6 6 Dual vco 6 14 01 Assembl Y ...
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