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Dla tego produktu nie napisano jeszcze recenzji!
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Schematy są ale można wysilić się i zrobić kolorowy skan i o większej rozdzielczości. Wtedy schematy płytek będą czytelniejsze. Całość super jako wartość merytoryczna. Wszystkie dane potrzebne do podłączenia różnego rodzajów urządzeń takich gramofon, CD itd.
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Szybko, sprawnie i tanio. Serwis godny polecenia. Będę polecał innym
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Ogólnie jest OK, z wyjątkiem obrazu płyty głównej, który jest miejscami mało czytelny, ale można sobie poradzić.
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Dokładna dokumentacja, pomogła w szybkiej naprawie telewizora. Dziękuję!
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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.
Focus/Tracking Gain Adjustment A servo analyzer is necessary in order to perform this adjustment exactly. However, this gain has a margin, so even if it is slightly off, there is no problem. Therefore, do not perform this adjustment. Focus/tracking gain determines the pick-up follow-up relative to mechanical noise and mechanical shock when the 2-axis device operate. However, as these reciprocate, the adjustment is at the point where both are satisfied. � When gain is raised, the noise when 2-axis device operates increases. � When gain is lowered, it is more susceptible to mechanical shock and skipping occurs more easily. This adjustment has to be performed upon replacing any of the following parts : � Optical pick-up � RV503 (Focus gain) � RV502 (Tracking gain) Normally, be sure not to move RV503 (focus gain) and RV502 (tracking gain). � Focus Gain Adjustment � Procedure : This adjustment is not performed. If focus gain RV503 is turned, set to mechanical center. � Tracking Gain Adjustment � (perform at normal operation) [MAIN BOARD] (Side B)
1. Place the optical pick-up level, horizontally. (If the optical pickup is not level, the 2-axis device will be weighted and adjustment cannot be done.) 2. Connect the oscilloscope between IC501 0 pin (TEO) and #º pin (VC) on the MAIN board. 3. Set the disc (YEDS-18) and Press the ^ (+) key. 4. Turn RV502 slightly clockwise (tracking gain drops) and obtain a waveform with a fundamental wave (waveform has large waves) as in Fig. 1 . 5. Turn RV502 slowly counterclockwise (tracking gain rises) until the fundamental wave disappears (no large waves) as in Fig. 2. 6. Set RV502 to the position about 30°counterclockwise from the position obtained in step 5. If RV502 contact point is more than 90° counterclockwise from mechanical center, tracking gain is too high. In this case, readjust from step 4. 7. Press ^ (+) or = keys and observe the 100 track jump waveform. Check that no traverse waveform appears for both ^ (+) or = directions. (See Fig. 3 and 4.) It is acceptable if the traverse waveform appears only now and then, but if it appears constantly raise tracking gain slightly and check step 7 again. 8. Check that there is no abnormal amount of operation noise (white noise) from the 2-axis device. If there is, tracking gain is too high, readjust starting with step 4. The waveforms are those measured with the oscilloscope set as shown below. � VOLT/DIV : 50mV � TIME/DIV : 5mS � Waveform when tracking gain lowered. Fundamental wave appears (Large amplitude appears.)
0V
oscilloscope (DC range) IC501 !º pin (TEO)
+ �
Fig. 1 � Waveform when fundamental wave disappears (Large amplitude does not appear.)
0V
IC501 #º pin (VC)
Fig. 2 � Waveform when no traverse waveform during 100 track jump. (Brake application is smooth because of adjustment.)
IC501
0V
30 10
100 track jump waveform
Fig. 3
� Waveform when no traverse waveform during 100 track jump. (Brake application is poor because of adjustment.)
0V
100 track jump waveform traverse waveform
Fig. 4
� 10 �
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