Aiwa XR-EM30 Service Manual page 42

ELECTRICAL ADJUSTMENT -6/8
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.
<FM ADJUSTMENT>
For adjusting FM, do wiring function and connection as in the following.
Standerd Signal Generaor
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).
SET
Lch
Rch
GND
-42-
TP8
GND
TP9
TP
Connect to the respective
measuring equipment
TP8
GND
TP9
AC MILLIVOLTMETER
CH1 CH2
GND
AC MILLIVOLTMETER
CH2
CH1
GND