– 38 –
8. Auto-Stop Function Check (MW)
Requirements: Same as Item 5.
(1) Adjust the S.S.G setting to AM; carrier at 999 kHz; distortion rate at 30 %; source at 1 kHz, and output at 40 ~ 70 dBuV.
(2) Start the tuning search mode, and check that the auto-stop function is applied at MW 999 kHz.
<FM Adjustment>
Make sure that the following settings are done before adjustment.
Preparation
* Measuring instruments: Standard Signal Generator (S.S.G.) / Oscilloscope / Millivoltmeter / Dummy resistor (6
Ω
)
(1) Connect the measuring instruments as shown in the diagram below.
(2) Connect the output terminal of signal generator to the antenna input terminal of the unit.
DUMMY
SPOUT(L)
AC MILLIVOLTMETER
CH2
CH1
6
Ω
OUTPUT
OSCILLOSCOPE
CH2
CH1
LOAD
SET
Standerd Signal Genertaor
FM ANT
SPOUT(R)
9. Tracking Adjustment
Requirements
* Test Point: SP OUT (Lch, Rch)
Adjustment point: L901, L902, L904, L905
(1) Adjust the S.S.G. setting to FM; carrier at 108 MHz, distortion at 75 kHz , and source 1 kHz, position output at maximum.
(2) Adjust the unit to FM 108 MHz.
(3) While monitoring 1 kHz waveform through oscilloscope, decrease the S.S.G. output level (till slight noises appear in the waveform).
(4) Adjust L905–>L904–>L902–>L901–>L902–>L904–>L905. Repeat adjustment (L905, L904, L902, L901) two to three time so that the
millivoltmeter indicates the maximum level.
10. Separation Check
Requirements: Same as Item 9.
(1) Adjust the S.S.G. setting to FM; carrier at 98 MHz; distortion at 67.5 kHz; source at 1 kHz, and output at 60 dBuV.
(2) Switch the S.S.G. to PILOT ON, and set to PILOT 7.5 kHz.
(3) Adjust the unit to FM 98 MHz.
(4) Check that S.S.G outputs only from Lch and that the difference between Lch and Rch at that time is 12 dB or above.
(5) Check for Rch in the same manner.
(2) Start the tuning search mode, and check that the auto-stop function is applied at FM 108 MHz.
Standard Signal Generator
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
