Samsung DVD-E138A/E138B User manual

DVD PLAYER
Chassis : Exino
DVD-E138A/E138B
DVD-E238
DVD-E338K
SERVICE
1. Precautions
2. Alignment and Adjustment
3. Exploded Views and Parts List
4. Electrical Parts List
5. Block Diagram
6. Schematic Diagrams
Manual
DVD PLAYER CONTENTS
SERVICE MANUAL DVD-E138A/E138B/E238/E338K
ELECTRONICS
© Samsung Electronics Co., Ltd. MAR. 2003
Printed in Korea
AK82-00326A
If you want to know additional information which is not including on this Service Manual, please refer to the
Training Manual of DVD-E234 (AK82-00314A).
DVD-E138A
DVD-E138B
DVD-E238
DVD-E338K

Schematic Diagrams
6-2 Samsung Electronics
6-1 Power
VAL5V
VAL5V

Schematic Diagrams
Samsung Electronics 6-3
6-2 A/V-Decoder/Main-Micom

Schematic Diagrams
6-4 Samsung Electronics
6-3 Servo

Schematic Diagrams
Samsung Electronics 6-5
6-4 Front-Micom/VFD Display/Key

Schematic Diagrams
6-6 Samsung Electronics
6-5 Video

Schematic Diagrams
Samsung Electronics 6-7
6-6 Audio (Only for DVD-E138A/E138B/E238)

Schematic Diagrams
6-8 Samsung Electronics
6-7 Audio (Only for DVD-E338K)

Schematic Diagrams
Samsung Electronics 6-9
6-8 Karaoke (Only for DVD-E338K)

Schematic Diagrams
6-10 Samsung Electronics
6-9 Karaoke Sub (Only for DVD-E338K)

Schematic Diagrams
Samsung Electronics 6-11
6-10 Key (Only for DVD-E338K)

Alignment and Adjustment
2-2 Samsung Electronics
2-2-1 Adjustment Spec. and Test Point
2-2 Skew Adjustment
Test Disc Adjustment Spec. Test Point Adjustment Location
TDV-533 “ENV” Screw A / B
Chapter 14 Flat Waveform (Main PCB - Component Side) Ass’y Deck - Top Side
(See Fig. 2-1) (See Fig. 2-2)
Fig. 2-2 Ass’y Deck (Top Side)
◆Test Disc ; Service not Available
<Table 2-1>

Alignment and Adjustment
Samsung Electronics 2-3
2-2-2 SKEW Adjustment Method
Needed to minimize the variations in Skew of the Pickup unit and to provide optimum match with the recorded
signal on the Disc.
1) Connect an Oscilloscope to the “ENV” Test Point (See Fig. 2-1).
2) Connect Power, Open the Tray and Play the TDV-533 Disc, Chapter 14.
◆Set the Oscilloscope Range as follows :
(Voltage ; 50mV/Div., Frequency ; 10m Sec.)
3) Adjust the Screws “A” and “B” (See Fig. 2-2) using a Hex screwdirvier until you obtain a Flat Waveform and
the picture is stable.
Then, go to Chapter 1 and make sure the Waveform is Flat here as well.
If not, you have to go back to Chapter 14 and adjust again.
If you cannot obtain a Flat waveform, then the unit is defective.
Note : The Deck must be in a horizontal position. Use both “A” and “B” screws to adjust.
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Typical Waveform before Adjustment Waveform after Correct Adjustment
Fig. 2-3 Envelope Waveform