Aiwa XR-X77 Service Manual page 40

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ELECTRICAL ADJUSTMENT -3/6

8. Tracking Adjustment (LW)

Requirement

Measuring equipment: Millivoltmeter

Test point: TP8(Lch), TP9(Rch), GND

Adjustment point: L941, TC942

1) Adjust the S.S.G. setting to 144KHz of 30% variation and reduce the output level

all the way (till a certain degree of is monitored

2) Adjust the reception frequency of the main unit to 144KHz.

3) Adjust L941 until the value of the millivoltmeter reaches the maximum.

4) Adjust the S.S.G. setting to 290KHz 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 290KHz.

6) Adjust TC942 until the value of the milivoltmeter reaches the maximum.

7) Repeat the adjustment 2 or 3 times from step 1 to 6 above.

For adjusting FM, do wiring function and connection as in the following.

9. Tracking Adjustment

Requirement

Measuring equipment: millivoltmeter

Test point: TP8(Lch), TP9(Rch), GND

Adjustment point: L905, L904, L902, L901

1) Adjust the S.S.G. setting to 144KHz of 30% variation and reduce the output level

all the way (till a certain degree of is monitored through the oscilloscope).

2) Adjust L905 > L904 > L902 > L901 until the value of the milivoltmeter reaches the

maximum.

3) Adjust L901 > L902 > L904 > L905 until the value of the milivoltmeter reaches the maximum.

4) Repeat the adjustment 2 or 3 times from step 2 to 3 above.

through the oscilloscope).

-40-

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