jedyne do czego mogę mieć zastrzeżenie to jakość zdjęć zawartych w przesłanej instrukcji serwisowej ponieważ są fatalnej jakości, praktycznie nieczytelne. tak poza tym jestem zadowolony to jest to czego szukałem.
Instrukcja jest OK. Schematy czytelne, opisane niektóre procedury.
Tekstowy podgląd strony 13 (kliknij aby zobaczyć)
3) Observe the waveform on the spectrum analyzer and turn RV21 to adjust the modulation degree of a sub spectrum �A� in the figure 4 to be narrowest as shown below.
4) At this time, measure AC voltage of IC21 Pin 1 on the TX board with AC voltmeter and define the value as �V0� for the next adjustment. 5) Turn the RV21 again so that the AC voltage of IC21 Pin 1 becomes the same value as the two thirds of �V0�. (V1=V0 � 2/3) Adjustment Location: TX board (See page 6.) Adjustment and confirmation without a spectrum analyzer Please confirm the units by following procedure shown below. Here a series of procedure which can be performed without a spectrum analyzer is introduced. Deviation adjustment/confirmation 1) Input a 400 Hz 316 mV signal into the left channel of transmitter. 2) Measure the AC voltage at the Pin 1 of IC21 (MJM2100M) with AC voltmeter. Spec.: 100 ± 10 mVrms If not, turn RV21 for obtaining the value. Adjustment Location: TX board (See page 6.) Sub-carrier frequency and output level confirmation 1) No signal is input into transmitter. 2) Connect a oscilloscope and a frequency counter to the test point TP1. 3) Confirm the voltage is within the following spec. Spec.: 0.55 Vp-p
0.55 Vp-p
4) Confirm the frequency is within the following spec. fsub=42 ± 2 kHz
SCHEMATIC DIAGRAM
� Original Service Manual page 7. (Location C � E, 6 � 8) Connection point
PRINTED WIRING BOARD
� Original Service Manual page 5. (Location A � C, 4 � 6)
oscilloscope frequency counter IN
