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Philips DVDR985
Technical Training Manual
Philips Service and Quality/Training
One Philips Drive
Knoxville, TN 37914-1810
P. O. Box 14810
PH: 865-521-4397
FAX: 865-521-4818
EMAIL: [email protected]
Introduction DVD Basics
This Manual is intended for use by the Service Philips with nine other manufacturers chose a
Technician. The first portion of this manual con- format specification for DVDR and RW on March
tains a basic description of disc based data play- 16, 2001. This new format uses Real Time
back and recording technologies. Self recording. Its recording is compatible with DVD-
Diagnostics are included to aid in troubleshoot- Video, and DVD ROM. The data blocks use loss-
ing. Technical Descriptions of the circuitry is fol- less linking. The physical layout matches very
lowed by a Troubleshooting Section. closely that of DVD ROM. See Figure 1. It also
uses Direct Overwrite when a RW disc is used.
The DVDR985 is the forth in a line of DVD
recorders. The DVDR1500 was the first. Laser Technology
Recordings can be made from broadcast trans-
missions, and from other analog or digital CDs use a red laser created by a diode and lens
sources. The DVDRW format allows the user to system often called a Light Pen. Refer to Figure
record and erase a disc many times. The record- 2. The narrow beam of light is focused onto the
ed discs will play on most existing and future reflective layer of a disc. At the instant that focus
DVD players. The DVDR985 has a connection is achieved, the disc is spun. The laser starts on
for DV or Digital camcorders via an I-Link or the innermost tracks of the CD and reads out-
Firewire connection. This connection technically ward. At the beginning of the disc is the Table of
is called an IEEE 1394 connection. This machine Contents. At the bottom of the Light Pen are
records on 4.7Gbyte DVD+R and DVD+RW Monitoring Diodes. The Monitoring Diodes pro-
discs. This machine uses a real-time MPEG2 vide information about focus and tracking. Data
Variable Bit Rate, VBR, Video encoder. The is retrieved from the disc in the form of pulses of
DVDR985 plays back DVD Video, Video CD,
Audio CD, CD-R, and CD-RW discs.
Its many features include: Favorite Scene
Selection for easy editing, Index Picture Screen
for instant overview of contents, Digital Time
Base Correcter, Digital Audio output (DTS, AC-
3, MPEG, PCM), TruSurround for 3D sound,
Zoom + Perfect Still. It is Widescreen, 16:9
compatible, and has a Universal Remote
Control, 20 disc resume, Disc Lock, and One
Touch Recording.
Virgin Mode
The DVDR985, when first hooked up, needs to
get information from the user about what lan-
guage and what local broadcast system the
unit is going to operate with. Use the remote to
make those selections. The unit will not operate
until this process is completed. If you want the
recorder to start up in Virgin mode, unplug the
recorder. Plug the recorder in again while hold-
ing the STANDBY-ON button.
Figure 1