Sony S530D manual Driver IC802 Translates the Command, IC202 Instructs Hybrid Gate Array IC601

The “tray 3” group of waveforms below are taken of the serial communi- cations occurring when the front panel tray button S212 is pressed. Note that when comparing these waveforms to the group of “tray 1”, an extra set of communications takes place 20msec later.

P M 3 3 9 4 , F L U K E & P H I L I P S

39

	Loading Motor Command
Tray Motion	Command Voltage at IC601/pin 92
Stopped	1.6V (open circuit)
Opening	3.2V

ch1

ch2

ch3

ch4

T

1

2

= A G 3

CH1!5 . 00 V=

CH2!5 . 00 V=

4

CH3!5 . 00 V=

CH4!5 . 00 V= CHP MTB10 . 0ms - 0 . 72dv ch1 -

Closing 0V

Driver IC802 Translates the Command

Driver IC802 applies the voltage necessary to turn the loading motor. The loading motor moves the tray. As the tray moves in, the motor pulls up the laser platform.

Tray Drive Voltages

Tray CN011/pin 1 CN011/pin 2

Waveforms Tray 3 = Tray Button Pressed

	Name	Location	Voltage/div
Channel 1	XIFint(interrupt)	CN006/pin 2	5Vp-p
Channel 2	Serial data	CN006/pin 4	5Vp-p
Channel 3	Serial clock (SCO)	CN006/pin 6	5Vp-p
Channel 4	Chip select (CSOL)	CN006/pin 3	5Vp-p
Time base		10msec/div.

IC202 Instructs Hybrid Gate Array IC601

System Control IC202 coordinates and controls many operations. A Hy- brid Gate Array IC601 is used to interface IC202 to other ICs for analog and digital operations. Information is sent between IC202 and IC601 us- ing a parallel bus and chip select lines. Communications between these two ICs occurs when IC202/pins 7 and 10 applies a low to chip select IC601/pin 142 & 141.

From this communication, the Hybrid Gate Array IC601/pin 92 outputs the loading motor command using tri-state output. When the output is open circuited, the loading motor does not turn. A high causes the tray to open (extend).

IC601/pin 91 is grounded when the tray is out. This low is brought to IC802/pin 9 to prevent the tray motor from moving (inhibited).

Stopped	5.7V	5.7V
Opening	7.36V	3.5V
Closing	3.6V	7.6

Tray Position Switch Returns Information to IC201

Two switches under the transport on the MS-29 board detect the tray and laser platform position. Both of these switches return status information to Interface IC201.

Tray position switch S001 stops the loading motor during tray open. IC601 receives the switch information and opens drive pin 92 to stop the loading motor. Both S001 and S002 stop the motor during tray close.

Tray Position Switch Voltages

	Tray Position Switch S001		Chuck Switch S002
Tray	CN011/pin 3	CN011/pin 4	CN011/pin 6
Open	3.2V	0V	3.2V
Closed	0V	3.2V	0V

S001 and S002 switch information pass IC601 and IC202 to IC201:

1.This information completes the tray position logic so the motor can reverse rotation with each press of the tray button.

2.Activates the loading motor if the user has pushed the tray in.

If IC201 does not receive the correct tray closed or open feedback, the loading motor will be instructed to reverse direction.