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 19 (kliknij aby zobaczyć)
CMT-A50/A70
CD SECTION
Note: 1. Perform all CD section check in the CD Test Mode. (Refer to page 16) 2. Use the PATD-012 disc (Part No.: 4-225-203-01). 3. Use an oscilloscope with more than 10 M� impedance. 4. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.
Checking Location: � CD Board (Conductor Side) �
Procedure: 1. Connect an oscilloscope to TP (TE) and TP (VC) on the CD board. 2. Load the disc (PATD-012). 3. Press the three buttons of x , [MODE/DIR] and [CLOCK] simultaneously to enter the CD Test Mode and display �88� (Initial mode). 4. Press the CD u button to enter the FOCUS1 mode and display �F-�. 5. Confirm that the center level of waveform is 0 V. 6. Confirm that the Vp-p value of waveform is 0.35 to 1.1 V.
VOLT/DIV: 0.2 V (with the 10:1 probe in use) TIME/DIV : 1 ms
Procedure: 1. Connect an oscilloscope to TP (RF) and TP (VC) on the CD board. 2. In the FOCUS1 mode, press the CD u button to enter the ALL SERVO mode and display �P-�. 3. Confirm that the oscilloscope waveform is as shown in the below figure. (eye pattern) A good eye pattern means that the diamond shape ��� in the center of the waveform can be clearly distinguished.
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.) TIME/DIV: 200 ns
0.6 to 1.2 Vp-p
When observing the eye pattern, set the oscilloscope for AC range and raise vertical sensitivity.
