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ELECTRICAL ADJUSTMENT -2/6
< AM ADJUSTMENT>
For AM adjustment, do wiring and connection as in the following.
Standard Signal Generator
5. IF ADJUSTMENT
Requirement
Measuring equipment: Oscilloscope or Millivoltmeter
Test point: TP8 (Lch), TP9 (Rch), GND
Adjustment point: L802
1) Adjust the setting of Standard Signal Generator (hereinafter S.S.G.) to 999 kHz of 30% variation.
2) Adjust the receiving frequency of the main unit at 1000 kHz.
3) While looking at the waveform on the oscilloscope, reduce the output level all the way (till a certain
degree of is monitored through the oscilloscope).
4) Adjust L802 until the waveform of the oscilloscope reaches the maximum.
6. TRACKING ADJUSTMENT (AM)
Requirement
Measuring equipment: Millivoltmeter
Test point: TP8 (Lch), TP9 (Rch), GND
Adjustment point: L954, L955
1) Adjust the S.S.G. setting to 1,000 kHz of 30% variation and reduce the output level all the way
(till a certain degree of is monitored through the oscilloscope).
2) Adjust the reception frequency of the main unit to 1,000 kHz.
3) Adjust L954 until the value of the millivoltmeter reaches the maximum.
4) Adjust the S.S.G. setting to 600 kHz of 30% variation and reduce the output level
all the way (till a certain degree of is monitored through the oscilloscope).
5) Adjust the reception frequency of the main unit to 600 kHz.
6) Adjust L955 until the value of the milivoltmeter reaches the maximum.
7) Repeat the adjustment 2 or 3 times from step 1 to 6 above.
60 cm
-35-
SET
TP
Lch
Connect to the respective
Rch
measuring equipment
GND
CH1
Lch
Rch
GND
AC MILLIVOLTIMETER
TP8
GND
TP9
OSCILLOSCOPE
CH2
GND
CH1
CH2
GND
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