Circuit Descriptions; Output Voltages; Psu Connection; Power Supply - Yamaha DVD-S530 Service Manual

DVD-S530/DV-S5550

CIRCUIT DESCRIPTIONS

1. Introduction

2. Power Supply

3. Control and Display
4. Audio/Video (A/V) and SCART
5. Loader/Mono Board
Notes:
• Figures can deviate slightly from the actual model.
• For a good understanding of the following circuit
descriptions, please use the "BLOCK DIAGRAM" on
page 51 and "SCHEMATIC DIAGRAMS" on page 70 –
84.
1. Introduction
Some of their features of this model are:
• MP3 playback.
• 3D Sound.
• Auto power off (after 15 min.).
• Built in MPEG2, MP3, and AC-3 decoder.
• CD-R(W) compatible.
• DVD+R(W) compatible.
• RGB video output on SCART.
Panel Overview
3p cinch
CVBS | Left | RIGHT | S/W
AUDIO/VIDEO BOARD
8p cable
* Europe Version *
VFM2002 LEAD
PSU
(220V ~ 240V)
4p cable
2p / 4p cable
STDBY BOARD
(1 x Tact Switch)
2. Power Supply
2.1 Introduction
The supply is a Switching Mode Power Supply (SMPS),
which uses the control IC TY720xx to produce pulses to
drive the power 'switch' (MOSFET). The TY720xx (item
7130) is a high performance, current mode controller for
DC-to-DC converter applications.
The operation frequency varies with the circuit load. When
the output power demand decreases, the switching
frequency raises, with a maximum frequency of 125 kHz
(determined by C2107 at pin 5). At this point, the internal
VCO takes over and starts to decrease the switching
frequency.
This has some benefits compared to a 'fixed frequency'
flyback converter. The efficiency is better, which results in
a lower power consumption.
22
Digital / Optical
SINGLE
SVHS
Coaxial
SCART
VFM2002 LEAD
30p FFC
SD4.0X
MONOBOARD
8p FFC &
MERCURY III Loader
VFM2002 LEAD
DISPLAY BOARD
4p cable
FTD
IR
Fig. 1

2.2 Output Voltages

PSU Connection

8p cable
EPM PSU
(220V ~ 240V)
4p cable
Fig. 2
The following voltages are connected to the A/V board and
Front Display board via connectors 1101 and 1114 (1133)
respectively:
• +12VSTBY, 470 mA.
• +5VSTBY, 400 mA.
• +3V3STBY, 1200 mA.
• -8V, 30 mA.
• -32V, 16 mA.
The +12VSTBY, on pin 4 of connector 1101, is further
divided into the following voltage:
• +5V_DAC (via voltage regulator 7423), supply to audio
DAC, and OpAmp filter.
The +5VSTBY, on pin 6 of connector 1101, is further
divided into the following voltages:
• +5V, supply to SD4.0 mono board.
• +5VM, supply for analog circuitry.
The suffix 'STBY', indicates that the supply is not switched
'off' during Standby Mode. Power switching is done on the
A/V board with the STBY_CTRL signal from the slave
processor.
Power Switching
+5VSTDBY
+3V3STDBY
STDBY_CTRL
(from slave up)
Fig. 3
The derived voltages +3V3, +5V, and +5V_DAC are
switched 'off' during Standby Mode with a MOSFET (see
items 7308, 7309, and 7506 on diagram A3).
A/V BOARD
1 +3V3STDBY
2 +3V3STDBY
3 GND
4 +12VSTDBY
5 GND
6 +5VSTDBY
7 GND
8 -8VSTDBY
1
+5VSTDBY
2 GND
3 +12V
4 -32V
DISPLAY BOARD
+5VM
+5V
+5V_DAC
+3V3