DOWNLOAD Sony DCR-TRV900 Service Manual ↓ Size: 1.18 MB | Pages: 34 in PDF or view online for FREE

Model
DCR-TRV900
Pages
34
Size
1.18 MB
Type
PDF
Document
Service Manual
Brand
Device
Movie / OM
File
dcr-trv900.pdf
Date

Sony DCR-TRV900 Service Manual ▷ View online

3
1. SYSTEM CONTROL CIRCUIT
1-1. Outline
The DCR-TRV900 consists of its system with the four microprocessors (HI: Hu-
man Interface Controller, PCMCIA Digital Still Controller, Camera Controller
and Mechanism Controller).  The data transfer system and its block diagram are
shown in Fig. 1-1.
Relation between the above described controllers is that the HI controller (Human
Interface Controller that is abbreviated as HI controller hereafter) functions as the
master microprocessor while the other microprocessors work as the slave micro-
processors.  The HI controller establishes communication with other controllers
(IC302, IC2401 and IC751) using the clock synchronous serial communication.
When the HI controller detects any key input, it sends the corresponding mode
command to the camera controller and mechanism controller in accordance with
the contents of key input.  The desired functions are realized by the camera and
VTR in accordance with the commands.
At the same time, status of camera and VTR is always sent to the HI controller
through the respective controller so that the HI controller monitors and controls
the operating mode of the DCR-TRV900 all the time.
The control data of the HI controller and that of the mechanism controller have
already been stored in the EEPROM (IC2404).
The control data of the camera controller is saved in the EEPROM (IC301) and
that of the PCMCIA digital still controller is saved in the EEPROM (IC760).
Fig. 1-1
IC2204
HI
CONTROL
µ
P
IC2404
EEPROM
(D)
IC302
CAMERA
CONTROL
µ
P
IC751
DIGITAL
STILL
CONTROL
µ
P
IC2401
MECHA
CONTROL
µ
P
IC301
EEPROM
IC760
EEPROM
IC2404
EEPROM
(E, F)
(B)
(C)
4
1-2. System Control Block Description
1-2-1. HI Controller (IC2204)
The HI controller is always monitoring the input signal from the keyboard, LANC,
SIRCS and chime, and issues the corresponding command to mechanism control-
ler, camera controller, OSD, LCD driver and others.  The HI controllers and the
DCR-TRV900 system start up in the following sequence.
1 When a battery is installed, the main power is always supplied to the HI
controller as long as the main power is turned on.  The DCR-TRV900 entire
system is reset by the HI controller.  The HI controller monitors the input
signals all the time.
2 When the POWER ON command is issued from the HI controller as acti-
vated by the key input or any other input signals, the power is supplied to the
mechanism controller, camera controller and digital still controller.
3 Then the respective ICs that are connected to each controller are reset and
start their operations.
1-2-2. Mechanism Controller (IC2401)
 To be called as mechanism controller hereafter
When the mechanism controller receives the mode transition commands from the
HI controller, it issues the commands to control the I/F that uses the i.- LINK, to
control the tape format (TFD), to control the LINE OUT signal (A01) and to con-
trol I/F (ABC) the microphone input signal.  The respective ICs perform their
function in accordance with the commands.  Status of these ICs are fed back to the
HI controller through the input controller so that the HI controller monitors and
controls the operating mode at all times.
1-2-3. Camera Controller (IC302)
 To be called as camera controller hereafter
When the camera controller receives the mode transition commands from the HI
controller, it performs the following functions.
1 EEPROM (IC757) data reading and writing
2 Timing generator (IC204) control
3 VAP (IC302) control
4 FOCUS, ZOOM and ND filter control and motor control
5 Defects compensation and others
At the same time when the above controls are performed, status of each controller
is fed back to the HI controller through the camera controller.
The mechanism controller and the camera controller are connected in parallel
with respect to the HI controller.  Therefore, when any communication between
the mechanism controller and the camera controller is desired, a command needs
to be sent through the HI controller.  For example, to send a command from the
mechanism controller to the camera controller, it needs to be sent from the mecha-
nism controller to the HI controller first, then from the HI controller to the camera
controller.
1-2-4. Digital Still Controller (IC751)
 To be called as digital still controller hereafter
When the digital still controller receives the mode transition commands from the
HI controller, it performs the following functions.
1 It controls the file name and the header information when writing the com-
pressed data into the PC card and others.
2 It controls the file name and the header information when reading the com-
pressed data from the PC card and others.
5
LANC
KEY
EEPROM
Bus
SFD
VFD
ABC
AOI
DAC
EEPROM
LIP
TFD
IC1602
IC1601
IC1200
IC1501
Birds
TG
GCAM
IB
OSD
IC1502
CHIME
IC1602
          IC7401
          IC2203
        FK-4880
(Control Switch Block)
DISP bus 60 or 50Hz
I/O sync bus   60Hz/50Hz
Camera bus  50/60Hz
VSP bus  150Hz
DRS bus  150Hz
IC2204
HI Controller
LCD driver
TRX
TRF
A/D (VAP)
EEPROM
IC1814
IC1900
IC300
IC204
IC203
IC302
IC301
IC760
IC1600
IC1501
IC2001
IC1402
IC2002
IC2404
BBI
EVF DAC
LCD DAC
IC5001, 5102,
    5502
IC2401 
Mechanism Controller
IC302
Camera Controller
IC751
Digital Still Controller
SIRCS
1-2-5. System Control Block Diagram
6
1-3. Clock Signal Block Description
The sampling clock frequency systems of the DCR-TRV900 are classified into
the followings.
(1) For the camera system and external video input system: 13.5 MHz
The sampling clock frequency for the camera signal that is specified by
the DV format.
(2) For the signal compression system: 18.0 MHz
As the clock frequency for the Y-signal data and the C-signal data is 13.5
MHz, a higher clock frequency of 18.0 MHz is used to compress them
into a single data.
(3) i. LINK system: 98.3 MHz
The sampling clock frequency for the DV terminal is specified to be  98.3
MHz.
(4) For interfacing the record system: 8.37 MHz
Because the record circuit is located in a separate circuit board, and to
ensure the interfacing, this sampling frequency is used.
(5) For record system: 41.85 MHz
(6) For the playback signal processing system: 20.925 MHz
The frequency that is suited for processing the playback signal, is se-
lected.
(7) For VIDEO OUT: 27.0 MHz
The over-sampling frequency is used to improve the waveform character-
istics of the video LINE OUT signal.
Page of 34
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  • Here you can View online or download the Service Manual for the Sony DCR-TRV900 in PDF for free, which will help you to disassemble, recover, fix and repair Sony DCR-TRV900 Movie. Information contained in Sony DCR-TRV900 Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.