Service Manuals, User Guides, Schematic Diagrams or docs for : ARCAM DiVA DV78 hfe_arcam_diva_dv78_service_en

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DiVA          Service
              Manual
              Issue 1.0



DV78 DVD Player




                          ARCAM
                          Bringing music & movies to life
  DV78
Contents List

                Circuit Description

                Power Supply L959AY
                     ! CCT diagram
                     ! Component layout diagram
                     ! Parts list

                Main Board L960AY
                      ! CCT diagram
                      ! Component layout diagram
                      ! Parts list

                Display Board L961AY
                      ! CCT diagram
                      ! Component layout diagram
                      ! Parts list

                Transformers
                      ! L924TX
                      ! L925TX

                Mechanical Assembly
                     ! Exploded view diagram
                     ! Mechanical and packing part list
Diva Dv78 circuit description


Overview
                                                         Fig 1 PSU clock control
The DiVa DV78 is a completely new design platform
that share a similar circuit topology to the earlier        Fs            PSUFS1     PSUFS0     PSUCLK
released Vaddis V based players such as the Diva            Frequency     Pin 11     Pin 12     Output Pin 5
88+, Diva 89, DV27.                                         select        IC305a     IC305a     of IC305a
                                                            44.1 kHz      0          0          44.1 kHz
The player is based around acclaimed Zoran Vaddis           48 kHz        0          0          48 kHz
                                                            88.2 kHz      0          1          44.1kHz
V chipset coupled to high specification Wolfson D to A
                                                            96 kHz        0          1          48 kHz
converters for Left and Right channels.                     176.4 kHz     1          0          44.1 kHz
                                                            192 kHz       1          0          48 kHz
Power supply board.                                         Others        1          1          OFF

Non-switching                                            The PSU sync signal is driven into the power supply via
                                                         Resistor R9 if no Sync is present the unit is set to free run x
Mains power arrives at IEC inlet socket SKT1 and is      due to the RT/RC network attached to Pin 4.
filtered by EMC choke LI and Y caps C3 and C4,
mains switch SW2a/b switches both Negative and Live      IC1 is running in regulated mode and monitors the voltage
phases before the power reaches the mains select         output on the +5V and +3V3 D.C lines, the two voltages are
switch at location SW1 the switch allows the primary     summed by TR8 and Driven into the VFB and Comp inputs
windings of the transformer TX1 to be wired in either    of IC1, the Voltage is then regulated by changing the time
Parallel or Series configuration.                        base of the PWM output at pin 6 (longer the time base the
                                                         lower the voltage), the PWM switching frequency is driven
The Bridge rectifying Diode package at location D1       into the switch-mode transformer by the high speed Nmos
forms the basis of the conventional power stage and      device at position M1, R5 is used to sense the Current
supplies a VN35V6 (-35.6v) to the Switch mode            across the gate of the Nmosfet and in the event of a short
stage, transistor TR1 is biased by 2v7 Zener diode       circuit will safely shut the power supply down. We derive the
DZ1 and allows for the series Zener diodes DZ2, DZ3,     12v Mech supply from the output of M1 using the Ultra-fast
DZ3 to supply the VN13V5 and VN19V rails.                Diode at location D8 to rectify the PWM line.

We will also see a simple A.C present circuit this is    The D.C outputs from the switch mode have extensive
used for delayed output relay operation and fast relay   switch mode noise removing filters these are seen as 100n
closure under interrupted supply conditions thus         caps down to ground and Wire wound inductors in series
preventing op-amp offsets from reaching the Audio        with the supply rail.
output sockets.
                                                         Power supply main board
Switch mode
                                                         All the power supply rails are supplied to the main board via
The switch mode supply is formed around the              the 32 way FFC connector at location CON1001.
Driver/Control chip IC1 UC3843 (used in regulating
mode). The chip is referenced the 

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