Aiwa XR-EM70 Service Manual page 34

<MW/LW Adjustment>
For MW/LW adjustment, do wiring and connection as in the following.
Standard Signal Generator
5. IF adjustment (MW)
Requirement
Measuring Device: Oscilloscope and Millivoltmeter
Test Point: Lch, Rch, GND
Adjustment Point: L802
(1) Adjust the setting of Standard Signal Generator (hereinafter S.S.G) to 450 kHz of 30 % variation.
(2) Adjust the reception frequency of the set to 999 kHz.
(3) While looking at the waveform on the oscilloscope, reduce the output level all the way.
(4) Adjust L802 until the value of the millivoltmeter reaches the maximum.
6. Tracking Adjustment (MW)
Requirement
Measuring Device: Oscilloscope and millivoltmeter
Test Point: Lch, Rch, GND
Adjustment Point: L951
(1) Adjust the S.S.G setting to 999 kHz of 30 % variation.
(2) While looking at the waveform on the oscilloscope, reduce the output level all the way.
(3) Adjust L951 until the value of the millivoltmeter reaches the maximum.
7. Tracking Adjustment (LW)
Requirement
Measuring Device: Oscilloscope and millivoltmeter
Test Point: Lch, Rch, GND
Adjustment Point: L941, TC942
(1) Adjust the S.S.G setting to 144 kHz, 30 % variation and reduce the output level all the way.
(2) Adjust L941 until the value of millivoltmeter reaches the maximum.
(3) Adjust the S.S.G setting to 290 kHz, 75 kHz variation, and reduce the output level all the way.
(4) Adjust TC942 until the value of the millivoltmeter reaches the maximum.
(5) Repeat the adjustment 2 or 3 times from step 1 to 4 above.
8. Auto Stop Check (MW)
Requirement
(1) Adjust the S.S.G setting to 999 kHz, 30 % variation, and 78 dBuV for the output level.
(2) Activate the tuner search function, and check that there is reception of 999 kHz.
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60cm
– 34 –
SET
TP
Lch
Connect to the respective measuring device
Rch
GND
OSCILLOSCOPE
CH1
Lch
Rch
GND
AC MILLIVOLTMETER
CH1
Lch
GND
Rch
CH2 GND
CH2
GND