General; Features; Location And Function Of Parts - Sony DSR-25 Service Manual

Features

Overview
Features
The DSR-25 is a digital videocassette recorder using
1
/ -inch tape. Offering the DVCAM™ digital recording
4
format, the DSR-25 produces stable, superior picture
quality by digitally processing and separating image
signals into color difference signals and a luminance
signal (component video). The DSR-25 can handle
both NTSC and PAL color systems and is equipped
with an analog interface as well as a digital interface
enabling connection to a digital device such as a
computer. The built-in color LCD monitor lets you
check images easily.
The main features of the DSR-25 are described below.
DVCAM Format
DVCAM is based on the consumer DV format,
which uses the 4:1:1 component digital format
(NTSC) or the 4:2:0 format (PAL), and
provides a 1 / -inch digital recording format for
4
professional use.
For details, see "Compatibility of DVCAM and DV Format"
on page 76 (GB).
6
(GB) Chapter 1 Overview
Features
Menu system for functionality and
operation settings
The unit provides a menu system to make its various
functions easier to use and set up.
Superimposition function
Time code, warnings, menus, and other text data can
be output as analog video signals and can be
superimposed on the image output to the LCD
monitor.
Easy maintenance functions
• Self-diagnostics/alarm functions: The system
automatically detects an invalid operation, an invalid
connection or a malfunction, and displays a
description, a cause and a recovery method on the
LCD monitor and outputs the data as analog video
signals.
• Digital hours meter: A digital hours meter counts
four types of time data—operating time, drum
rotation time, tape running time, and tape threading/
unthreading. The digital hours data are indicated on
the menu.
......................................................................................
, , and are trademarks of Sony
Corporation.
8
(GB) Chapter 1 Overview
SECTION 1

GENERAL

1
Chapter
High picture quality, high stability
Video signals are separated into color difference
signals and a luminance signal, which are encoded and
compressed to one-fifth size before being recorded to
ensure stable and superb picture quality.
Because the recording is digital, multi-generation
digital dubbing can be performed with virtually no
deterioration of quality.
Wide track pitch
The recording track pitch is about 15 µm, fully 50
percent wider than the DV format's 10 µm track pitch.
Thanks to this feature, the DVCAM format fully meets
the reliability and precision requirements of
professional editing.
High-quality PCM digital audio
PCM recording makes for a wide dynamic range and a
high signal-to-noise ratio, thereby enhancing sound
quality.
There are two recording modes: 2-channel mode (48
kHz sampling and 16 bit linear code), which offers
sound quality equivalent to the DAT (Digital Audio
Tape) format, or 4-channel mode (32 kHz sampling
and 12 bit nonlinear code).
DV format compatibility
The unit can perform recording and playback in the
DV-format (SP mode only). (Recording/playing an
image in LP mode is not available.)
NTSC/PAL systems compatible
The unit is compatible with NTSC and PAL systems.
With DV connection or in the playback mode, the
color system of signals is detected automatically. The
color system select switch on the unit allows input of
analog video signals in either color system. This
compatibility allows you to record (download) or play
back (upload) both NTSC and PAL formatted signals
with your VCR, computer, or other equipment.
However, the unit cannot convert the color system of
the signals.
Choice of two cassette sizes
The unit can use both standard-size and mini-size
DVCAM/DV cassettes.
• According to cassette size, the position of the reel
drive plates automatically changes.
• The maximum recording/playback times are 184
minutes for standard size cassettes and 40 minutes for
mini-size cassettes (DVCAM format).
Remote control
The unit can be operated by remote control from the
CONTROL S system Remote Control Unit (DSRM-
20, not supplied).
High-speed search function
If you use the Remote Control Unit (DSRM-20, not
supplied), the unit has a picture search function that
allows you to view color pictures at playback speeds
up to 14 times normal speed (NTSC) or up to 17 times
normal speed (PAL) in both forward and reverse
directions.
You can also search frame-by-frame in jog mode.
While searching for scenes, you can also hear playback
audio.

Location and Function of Parts

Front Panel
1 Cassette compartment
2 KEY INH switch
3 ON/STANDBY
switch and
1
lamp
KEY INH
ON OFF
4 TIMER selector
AUDIO OUTPUT
SELECT
CH- CH-
1/2 3/4
5 AUDIO OUTPUT
SELECT selector
MIN MAX
6 PHONE LEVEL
control knob
7 PHONES jack
8 RESET button
1 Monitor display section
(see page 11 (GB))
9 CHARACTER DISPLAY switch
1 Cassette compartment
Insert a standard-size or mini-size DVCAM cassette.
To open or close the compartment, press the EJECT
button qa.
For details of cassettes that can be used, see "Notes on
Video Cassettes" on page 26 (GB).
2 KEY INH (key inhibit) switch
Turning on this switch disables all of buttons to
prevent accidental button operations.
Notes
• In addition to the Remote Commander supplied with
the unit, the unit accepts signals from any Sony
Remote Commander whose command mode is set to
VTR4. If you want to disable the control from any
Remote Commander, set COMMANDER on the
OTHERS menu to CONTROL S.
• The TIMER selector 4 setting has a higher priority
than this switch setting.
• When this switch is set to ON, the ON/STANDBY
switch 3 does not work. To enable the ON/
STANDBY switch, set this switch to OFF.
1-1
This section is extracted from DSR-
25 instruction manual.
Digital slow playback
The unit has a frame memory function that allows slow
playback without noise. This is available only at +
time speed and – 1 / -time speed.
3
Time code and user bits
On this unit, you can use time code and user bits.
Using the menu, these can be set easily.
Jog audio function
If you use the Remote Control Unit (DSRM-20, not
supplied), audio can be monitored at various playback
speeds when in jog mode.
Other Features
Built-in color LCD monitor
The unit has a 2-type color LCD (liquid crystal
display) monitor that lets you verify images on the
spot. You can see the setup menus, audio levels, and
system statuses. Menus and data can be superimposed
over the picture being displayed.
Duplicate, including cassette memory data
Using an i.LINK cable, you can duplicate a tape that
includes time code and cassette memory data, etc. If
the original tape has blank portions, you can duplicate
the tape skipping those portions.
Audio dubbing function
The unit allows you to record just the sound onto the
recorded tape (audio dubbing). (To dub sounds, you
are allowed to use only channel 3 and 4 of the tape
recorded in DVCAM format, the audio mode of which
is 32 kHz.)
Chapter 1 Overview
4 Display window
(see page 16 (GB))
qa EJECT button
DSR-25
FIX VAR
CH-1
(DUB CH-3)
3 Audio control section
(see page 15 (GB))
NTSC
PAL
CH-2
(DUB CH-4)
2 Tape transport control
section
(see page 13 (GB))
0 INPUT SELECT
selector
3 ON/STANDBY switch and lamp
Press this switch to turn the unit on. The ON/
STANDBY lamp lights up in green. When you press
this switch again, the unit goes into the standby mode
and the lamp lights up in red.
Note
When the KEY INH switch is set to ON, this switch
does not work. To enable this switch, set the KEY INH
switch to OFF.
4 TIMER selector
Use to select Auto Repeat or recording using an
external AC timer (not supplied).
REPEAT: Whenever the power is connected to this
unit, a tape rewinds to its beginning automatically
and playback starts. The unit repeats the playback
from the beginning to the first index (if there is no
index on the tape, to an unrecorded portion; if there
is no unrecorded portion, to the end of the tape).
Auto Repeat also functions if you set this selector
to REPEAT during playback or rewinding.
For details on Auto Repeat, see "Automatically playing
back a tape repeatedly (Auto Repeat)" on page 35
(GB).
(Continued)
Chapter 1 Overview
DSR-25
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