Pioneer cld 3750 kv service manual

Page 1

Service
Manual

CDNIDEO CD/LD PLAYER

aamaamam @621

SERVICE GUIDE
ORDER NO.
RRV1 5 1 9

CLD-3750KV
CLD-1 750 KV

CONTENTS

1. SPECIFICATION OF VIDEO CD ..
2. VIDEO CD FORMAT.
3. PEG OPERATION
4. SPECIAL PLAYBACK ..
5. VCDB ASSYIT HE METHODS OF REPAIR ..

PIONEER ELECTRONIC CORPORATION 4-1. Meguro 1-Chome. Meguro-ku, Tokyo 153, Japan

PIONEER ELECTRONICS SERVICE. INC. P.O.Box 1760, Long Beach, CA 90301-1760. U.S.A.

PIONEER ELECTRONIC EUROPE] NM. Haven 1087, Keaberglaan 1, 9120 MelseIe, Belgium

PIONEER ELECTRONICS ASIACENTIIE PTE. LTD. 501 Orchard Road. #10-00 Lane Crawford Place, Singapore 0923

© PIONEER ELECTRONIC CORPORA'HON 1996

T-EM JUNE 1996 Primed in Japan

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CLD-3750KV, CLD-1750KV

1. SPECIFICATION OF VIDEO CD

1.1 VIDEO CD

0 A maximum of 74 minutes of moving pictures with audio are
recorded in a 12 cm (Sinch) disc by using the compression tech-
nology of the inteman'onal standard MPEG. (Audio is also com-
pressed by MPEG.)

0 Pictures using MPEG have no red stripes or noise causing skipped
color. However, block distortion and so-called mosquito noise
exist in the pictures.

Picture quality of Video CD

Since the units of screen compression are macro blocks and
blocks. error will be generated in units of blocks it the screen
as a whole moves. Thus, distortion may be generated on the
borderline between blocks, resulting in a screen blurred with
mosaics. This is called block noise."

Error during compression may generate noise, that looks like
a blur in a position with high frequency in the screen (edges
of characters, etc), or mosquito noise.

TV SCREEN

BLOCK NOISE

MOSQUITO NOISE

Fig. 1-1

These noises are generated during encoding. Therefore, they can-
not be reduced or eliminated at the decoding side (player).

O The track pitch and the bit length of Video CDs are equivalent to

those in normal CDs (CD-DA). The file structure complies with
the ISO 9660. Thus. Video CDs belong to CD-ROM XA. (There-
fore. Video CDs can be played back with personal computers if
the MPEG board is used.)
Besides 12 cm (Sinch) discs, there are 8 cm (3inch) discs. Also.
CD-DA can be recorded on the external perimeter of the MPEG
track. In addition, subcodes (graphics) can be recorded. How.
ever, the CLD3750KV and CLD-l750KV are not designed to
use subcodes of the MPEG track.

O Moving pictures of MPEG are recorded after Track 2. At least a
single track must be used. With the CLD-3750KV and CLD-
1750KV, the system displays a value deducting 1 from the actual
track number of Video CD played back for searching or display.
Although other companies are using similar methods. these meth~
ods are not established as a rule. Therefore. some discs may in-
dicate actual track numbers on their labels.

1.2 BASIC KNOWLEDGE OF VIDEO CD
Category of Video CD

CD ROM

CD-l FULL MOTION VIDEO
CD-I STILL PICTURE

VIDEO CD

PHOTO CD

Fig. 1-2

1.3 SPECIFICATIONS OF VIDEO CD

Physical format CD-ROM (XA)

Digital video Complies with MPEGI.

Picture sinicture rate
3SD<240I2937H2 (NTSC)
357X240/23375Hz (FILM)
357x288I25l-lz (PAL)

Transmission rate: max. 1.152 MBPS

Digital audio Complies with MPEG1 Layer II.

Sampling frequency : 44.] kHz

Bit rate : 22AkBPS

Playback time Max. 74 minutes

Pixels of still picture Standard level: 352x240

High definition level: 704x430

Playback specification Normal playbadtand Menu playback using PBC

Video signal output NTSC/PAL

Fig. 1-3