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 16 (kliknij aby zobaczyć)
HCD-NEZ3/NEZ5
2. Turn the adjustment screw and check output peaks. If the peaks do not match for L-CH and R-CH, turn the adjustment screw so that outputs match within 1dB of peak.
CD SECTION
Note: 1. 2. 3. 4. CD Block is basically constructed to operate without adjustment. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated. Use an oscilloscope with more than 10 M� impedance. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.
L-CH peak Output level R-CH peak
within 1dB within 1dB
5. Check the focus bias check when optical block is replaced.
3. Mode: Playback
test tape HEAD PHONE board P-4-A063 PHONES jack oscilloscope (6.3 kHz, �10 dB) (J500)
Procedure : 1. Connect the oscilloscope to TP (RFACO) and TP (VC) on the CD board. 2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01) 3. Press the
CD u
button.
V set
H
4. Confirm that the oscilloscope waveform is as shown in the figure below. (eye pattern) A good eye pattern means that the diamond shape (�) in the center of the waveform can be clearly distinguished. � RF signal reference waveform (eye pattern)
waveform of oscilloscope
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.) TIME/DIV: 500 ns
in phase 45° good
90° 135° 180° wrong
1.1 0.2 Vp-p
4. After the adjustments, apply suitable locking compound to the pats adjusted. Adjustment Location: Record/Playback/Erase Head
When observing the eye pattern, set the oscilloscope for AC range and raise vertical sensitivity.
Checking Location: � CD BOARD (Conductor Side) �
