Read Sony SCD-1 / SCD-777ES Service Manual online
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2-6. LOADING PANEL AND STABILIZER DETECTION CIRCUITS
(1) Loading Panel Position Detection
The expander’s LD SW0 and SW1 terminals (Pins 4 and 5 of IC712) check the OPEN and CLOSE switches (S003 and S004) to detect
the loading panel’s status.
Depends on the panel’s status, the expander’s LOAD and UNLOAD terminals (Pins 9 and q; of IC712) control the loading motor drive
(IC515) and the loading motor drive (IC515) rotate the loading motor and move the loading panel.
If the loading motor is rotated in the same direction for over 4 seconds and the operation still does not complete, the motor will be rotated
in the opposite direction.
(2) Stabilizer Detection
The STB board’s LED (D002) and sensor (IC009) detect the stabilizer. The detection signal is input to the expander’s STBL DTC terminal
(Pin 1 of IC712).
Servicing Tip:
When the loading assembly is removed, loading panel and stabilizer detection signals will not be input. Thus, set operations cannot be
confirmed. In this case, set the test mode to “ADJUSTMENT 2 MODE” and confirm operations.
confirmed. In this case, set the test mode to “ADJUSTMENT 2 MODE” and confirm operations.
2-7. SPINDLE MOTOR MOVEMENT
The spindle motor that has chucked the disc will be moved to the side where the optical block is. With serial data from the main micropro-
cessor (IC701), the S-OUT signal will be output from the servo DSP (IC512), the sled driver (IC503) driven and the sled motor (M2) rotated.
The IN switch (S002) will detect the completion of the movement. The detection signal will be input to the expander’s SLD SW0 and
SW1 terminals (Pins 6 and 7 of IC712).
Note: Time between disc insertion and sound playback
After a disc has been inserted, the SACD player will detect the disc type, make functional playback adjustments in keeping with the
disc’s features and the like. Because it takes some time to detect the disc type, it may feel as if it takes a long time until playback starts,
but this is not indicative of trouble.
disc’s features and the like. Because it takes some time to detect the disc type, it may feel as if it takes a long time until playback starts,
but this is not indicative of trouble.
2-8. DISC TYPE DETECTION
Based on the following three types of detection, a disc will be judged as one of four types (CD, single layer, dual layer or hybrid).
(1) HD layer detection
(2) CD layer detection
(3) SL/DL detection
(2) CD layer detection
(3) SL/DL detection
Fig. 2-4. Disc Type Detection
When it is time for disc type detection, the tilt servo will be applied to the optical block used in detection.
HD Layer?
START
CD Layer?
CD Layer?
SL?
YES
NO
YES
DL
SL
Hybrid
NO DISC
CD
YES
NO
YES
NO
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