Philips DVD963SA manual Control and Display Panel

Circuit Descriptions and List of Abbreviations DVD963SA 9. EN 85

does not support this, an external circuit (two bi-directional switches, named switch "1" and switch "2") is added. The Y- and CVBS-components also share the same pins.

				STV6410
SCART to TV										AUX-SCART
SCART2										SCART1
Y/CVBS-out										Y/CVBS-out
Y/CVBS-in										Y/CVBS-in
L_out										L_out
L_in										L_in
R_out										R_out
R_in										R_in
R/C										R/C
G										G
B/C	1								2	B/C
SB										SB
										Aux Fast
Fast	Blanking					4/3;16/9				Blanking
Blanking						select
	Switch
	0 or 5V
A/V Board	1300
	C	Y	CVBS	R	G	B	L	R	I2C	CL 26532105_030.eps
										300802

Figure 9-13 SCART switching circuitry

•Switch "1" is controlled by the FB (Fast Blanking) pin (pin

16)of SCART2 (TV SCART):

–If the FB line is low, C is input on the B/C of SCART2.

–If the FB line is high, B is output on the B/C of SCART2.

•Switch "2" is controlled by the FB (Fast Blanking) pin (pin

16) of SCART1 (AUX SCART):

–If the FB line is low, C is output on the B/C of SCART1.

–If the FB line is high, B is intput on the B/C of SCART1.

We can distinguish four situations:

1.DVD player is ON, DVD is active (DVD mode):

NO LOOP-TROUGH.

2.DVD player is ON, DVD is not active (TV mode):

LOOP-TROUGH.

3.DVD player is ON, external source becomes active:

LOOP-TROUGH.

4.DVD player is in STBY:

LOOP-TROUGH.

9.7Control and Display Panel

9.7.1Control

Slave processor

The key component on this board is the (slave) microprocessor (item 7401). It runs on an 8 MHz system clock generated with a ceramic resonator (item 1119) and has a reset circuit (item 7105) that is triggered by the +5Vstb voltage.

The start-up sequence is as follows:

1.The required IC voltage is the +5Vstb, which is present during Standby Mode.

2.When the RESET circuit (item 7105) is triggered by the +5Vstb, the slave uP initialises.

3.This will set the STDBY_CONTROL signal to LOW, which will switch on the 12V and subsequently the +3V3.

4.Once these voltages are provided, the host uP (on the mono board) will reset (via reset circuit around item 7412 on the mono board, diagram M4).

5.Now, the host uP will initialise, and indicate the slave uP to activate the Standby Mode (STBY_CONTROL) signal.

6.The player wakes up from the Standby Mode when any button is pressed on the front panel, or when the 'Power' button is pressed on the Remote Control.

Also, when going to Standby, the slave processor will reset the host processor. When the slave processor receives the correct IR (or key) code to leave the Standby mode, it resets the host processor.

Note: The slave uP will not reset successfully, if the 8MHz clock oscillator has not stabilised (check on pin 8 of IC7101).

Other slave processor functions are:

•Generation of a scanning grid for the keys,

•Generation of the display grid and segment scanning,

•Generation of square signal to generate the filament voltage for FTD display,

•Inputs for RC5/6 and P50 (P50 controller is build in).

Standby LED

Transistor 7104 drives the Standby LED. When the STBLED signal from the slave processor is ‘high’ (pin 14), the LED is ‘off’.

Key Matrix

When a key on the local keyboard is pressed, the signal at the scanning pins of the microprocessor (pins 34, 35, 36 and 37) go from +5 V to 0 V.

IR Receiver

The IR controller in the slave processor handles both RC5 and RC6 signals (input on pin 22). The logic is +5 V for ‘high’ and 0 V for ‘low’.

Status LEDs

The four status LEDs (SOUND, AUDIO DIRECT, UP- SAMPLING, and P-SCAN) are controlled by the slave processor.

P50 Interface

P50 (or Easylink) is a bi-directional serial interface for communication between video equipment. For European sets, this communication goes via pin 10 of the SCART connector, while for other regions (when present), this is a cinch connector. The slave processor controls the P50 bus (via pins 11 and 20).

9.7.2Display

Because these DVD players have an AC display (FTD) and a DC supply, an AC voltage is created by the microprocessor The slave processor has an internal square signal generator (42 kHz, duty cycle 45/55), to generate the AC filament voltage. This square voltage is amplified (by TS7106 and 7109) and decoupled (C2138 and C2143) before it is applied to the display. The necessary voltage of -32 V comes directly from the PSU.