5.DC BALANCE CHECK
(FM)
Requirement
Measuring equipment: Digital multi-meter
Test point: TP2, 3
(1) Adjust the reception frequency of the main unit to 98.0MHz.
(2) Check that the test point voltage difference between TP
2
and TP
3
is
0mV
±
500mV.
<LW / MW ADJUSTMENT>
For LW / MW adjustment, do wiring and connection as in the following.
6.IF ADJUSTMENT (MW)
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
k
Hz
(2) Adjust the receiving frequency of the main unit at 999
k
Hz.
(3)
While looking at the waveform on the oscilloscope, reduce the output level all the
(4)
Adjust L802 until the waveform of the oscilloscope reaches the maximum.
7.TRACKING ADJUSTMENT (MW)
Requirement
Measuring equipment: Millivoltmeter
Test point: TP8(Lch), TP9(Rch), GND
Adjustment point: L952, L953
(1) Adjust the S.S.G. setting to 999
k
Hz 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 999
k
Hz.
(3) Adjust L952 until the value of the millivoltmeter reaches the maximum.
(4) Adjust the S.S.G. setting to 603
k
Hz 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 603
k
Hz.
(6) Adjust L953 until the value of the milivoltmeter reaches the maximum.
(7) Repeat the adjustment 2 or 3 times from step 1 to 6 above.
GND
OSCILLOSCOPE
CH1
CH2
Lch
Rch
GND
AC MILLIVOLTMETER
CH2
CH1
GND
TP8
TP9
GND
V
DIGITAL MULTIMETER
VT
GND
60cm
SET
Standerd Signal Generaor
TP
Lch
Rch
GND
measuring equipment
Connect to the respective
–
53
–
of 30% variation.
way (till a certain degree of is monitored through the oscilloscope).
d u
p a
t o
r
Содержание XR-EM52
Страница 31: ... 31 SCHEMATIC DIAGRAM 4 TUNER d u p a t o r ...
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