Sony DVP S530D User Manual download pdf (Page 24)

Plug in Communications – between IC201 / IC202

Name Location Voltage/div

Channel 1 PCONT CN203/pin 1 5Vp-p

Channel 2 Dolby Digital LED D203/anode 2Vp-p

Channel 3 Bit clock from IC202 CN006/pin 6 5Vp-p

Channel 4 Data from IC202 CN006/pin 5 5Vp-p

Time base 200msec/div.

PM3394, FLUKE & PHILIPS

ch4

ch3

ch2

ch1

CH1!5.00 V=

CH2!2.00 V=

CH3!5.00 V=

CH4!5.00 V= CHP MTB 200ms- 0.40dv ch1+

Power ON

IC201

The power ON operation works much like a modern day computer. When

the power ON command is received, Interface IC201 begins a boot up

sequence using IC202 and IC205 to finish it. IC201 causes:

· The red standby light to turn to green;

· PCONT (at IC201/pin 24) to go high, powering the set; and

· Communications with System Control IC202, continuing the power

ON operation

IC202

IC202 continues the power ON operation, retrieving start up information

from the Flash ROM IC205. This start up information instructs IC202 to

check each IC on the parallel bus and wait for an acknowledgement sig-

nal. At power ON, these ICs are polled in the order shown in the table:

Power ON IC check sequence (not shown in the diagram)

Chip Select Source Destination IC

1. CS 1 - IC202/pin 10 SRAM IC204 / HGA IC601

2. CE – IC202/pin 11 Flash ROM IC205

3. CS 3 – IC202/pin 8 AV Decoder IC401

4. CS 4 – IC202/pin 7 HGA IC601

5. CS 2 – IC202/pin 9 AV Decoder IC401

6. XCS – IC601/pin 111 ARP2 IC303

7. HCS - IC601/pin 118 Servo IC701

When all the replies have been received, Interface IC201 is informed and

IC201 keeps the unit powered ON (PCONT remains high). At the same

time, IC201 turns on the front panel blue Dolby Digital LED.

If a communications failure occurs and there is no acknowledgement sig-

nal to IC202 within three seconds of power ON, the unit will turn off. The

PCONT signal (from IC201/pin 24) will go low and the player power is

removed. The green power ON light changes back to red (standby mode).

Post Power ON Check

Therefore, if the blue Dolby Digital LED lights, communications have taken

place and the unit remains ON. The next step is to determine if there is a

disc present. The disc check sequence is:

1. Tray up and chucked – chuck switch feedback

2. Sled moves to home position – photosensor feedback

3. Sled moves outward – no feedback (stepping motor)

4. Laser is turned ON momentarily while focus searching

5. Focus Search is performed – FE and PI feedback signal

6. Sled moves outward further – no feedback

7. Laser is turned ON and Search is performed again

8. Sled moves outward further – no feedback

9. Laser is turned ON and Search is performed a third time

10. Sled moves inward to home – photosensor feedback

11. Laser is turned ON and Search is performed a fourth time

12. Spindle motor rotates – FG amp kick drive feedback

13. Display reads NO DISC.

If an IC fails to receive the correct feedback from its sensors, System

Control will instruct IC201 to enter standby (red front panel light).

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Sony DVP S530D User Manual Page 24

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