Philips Comprehensive Guide and Circuit Descriptions for DVD Players

EN 78	9.	DVD963SA	Circuit Descriptions and List of Abbreviations
			9.3	Loader/Mono Board (for diagrams see
		K		SD4.00SA_CH Service Manual)
		R					Loader
		2.5V			DVDalas2+	Loader-interface
		A		-END
		CL 96532065_071.eps		FRONT
		130799			HF		Iguana	Program
					Buffer	(front-end		Memory
		Figure 9-2 TL431				processor)
This reference component has two functions:						I2S	S2B
• A very stable and accurate reference diode
• A high gain amplifier.					HF			SMI
When the output voltage increases (due to a reduction in the							STi55XX
								(SDRAM)
load), the voltage across RSENSE-2(R3290/R3291) increases to
				END		(back-end
above the internal reference voltage of 2.5V. The TL431 will								EMI
						processor)
				-				(FLASH)
conduct and the current through the opto-coupler will increase.				BACK
					PCM
This results in an increase of the voltage at pin 4 of IC1, which
will reduce the 'on' time of Q1(FET 7125). In the event of an					FURORE 2
output voltage decrease (due to an increase in the load), the							Video	Others
					Audio
control circuit will operate in the opposite way.
Primary Current Sensing							Module
The current through FET Q1 will result in a voltage drop across							Interface
								CL 26532053_022.eps
RSENSE-1 (R3120-23). This line goes to pin 11 of IC7130,
								260402
which is the current sense input. The higher the input voltage,
the more the primary current is limited. In this way, the					Figure 9-3 Block Diagram Loader/Mono board
maximum output power of the power supply is limited.

	The SD4.00_SA_CH (SACHI_4) is the 2nd generation Philips
Under-voltage Protection	Architectural Standard Design of SACD mono board based on
If the supply voltage at pin 13 of IC7130 drops below 7.2V	Furore 2, and will be used in the new generation of SACD
(typical), e.g. due to a shorted secondary voltage or excessive	players. It is designed in a multi-task way so that it can support
load, the drive pulse at pin 12 is disabled and the controller will	the following optional main functions:
switch 'off'.	• SD4.00_SA_CH: Support SACD player with 5-disc
		changer.
Over-voltage Protection	• SD4.00_SA: Support SACD player with single-disc.
An internal over-voltage protection circuitry continuously	•	SD4.00_CH: Support DVD player with 5-disc changer but
monitors the Vcc pin. If, after start-up, this voltage exceeds		without SACD playback.
40V, the internal latch circuit is triggered, the output buffer is	• SD4.00_SA_I2C: Support SACD player with single-disc
disabled, and the SMPS goes into over-voltage protection.		and I2C slave.
Now a complete restart sequence is required.	The SD4.00_SA_CH (SACHI_4) module consist of the
Note: If the event of the over-voltage situation remains present,
the SMPS will go in sequence of protection, start-up, protection	following key components:
and the cycle repeats. This effect is highly audible.	1. OPU: Mercury 2 Loader VAL6011/14 (slim type) for a
		single-disc SACD player, or DVD VAM6001/14 mechanism
		for a 5-disc SACD changer.
	2. Front-end:M2 Basic Engine.
	3. Back-end:DVD Host Processor STi55xx and Furore 2
		SACD DSD/DST decoder.
	4. Power supply: To convert the PSU voltages to the correct
		values.
	5. Reset circuit: This circuit that the booting of the several
		devices on the mono board takes place in the correct order.
	9.3.1 The Optical Pick-up Unit (OPU)
	The Mercury 2 Loader has an optical unit consisting of two
	lasers:
	• One for CD with a wavelength of 780 nm.
	• One for DVD with a wavelength of 650 nm.
	The TZA1033 (item 7105) controls the data from these lasers,
	and the supply to them.
	9.3.2 Front-end: the Servo Part
	The front-end consists of:
	•	The Loader interface