Samsung DA-E750 Service Manual (English)

Other manuals for Samsung DA-E750

Questions and Answers:

Ruth WilliamsJul 26, 2025

What to do if the Samsung DA-E750 indicates 'Power Protection Active'?

R
ruizbrianJul 26, 2025
If your Samsung Stereo System displays a 'Power Protection Active' message, it could be due to several reasons. The voltage of the SMPS (+5.2 VS) might be higher than the standard. Over-current may be occurring to the FET (due to over-output or a short circuit), the FET’s temperature might be exceeding 150 °C, or there could be no supply voltage on the GATE DRIVER. To resolve this, ensure the SMPS operates within the normal voltage range of +5.2 VS, check for short circuits or over-output conditions, allow the FET to cool down if it's overheating, and ensure there is proper supply voltage on the GATE DRIVER.

Samsung DA-E750 Specifications

General

Frequency range	- Hz
RMS rated power	100 W
Audio output channels	2.1 channels
Bluetooth	Yes
Bluetooth version	3.0+HS
Headphone connectivity	-
USB 2.0 ports quantity	1
Apple docking compatibility	iPad, iPhone, iPod
Power source type	AC
Power consumption (standby)	0.26 W
Power consumption (typical)	0.43 W
Dimensions (WxDxH)	450 x 240 x 148 mm
Compatible products	- iPod Touch 4/3 - iPod Nano 6/5\\t - iPhone 4S/4/3S\\t - iPad/iPad2\\t \\t - GALAXY S II\\t - GALAXY Note
Product color	Wood

Weight and Dimensions

Weight	8600 g

Summary

Precaution

Safety Precautions

Instructions for handling the device safely during servicing to prevent hazards.

Servicing Precautions

General safety guidelines and procedures for servicing the audio unit.

Precautions for Electrostatically Sensitive Devices (ESDs)

Measures to prevent damage to sensitive electronic components from static electricity.

Product Specification

Product Feature

Details on the DA-E750 Dual Docking Audio system's capabilities and functions.

Specifications

Technical specifications for the DA-E750 and DA-E760 models.

Specifications Analysis

Comparison of specifications across different models, including features and ratings.

Accessories

List of supplied accessories with their item codes and remarks.

Troubleshooting

Checkpoints by Error Mode

Oscilloscope settings for checking various operational modes and error conditions.

No Power

Flowchart for diagnosing and resolving issues where the unit does not power on.

No Output

Flowchart for troubleshooting audio output problems and checking power supply.

Measures to be taken when the Protection Circuit operates

Actions to take when the protection circuit in the SMPS is activated.

Check AMP in Power Protection

Procedure to test the Amplifier PCB for issues related to power protection.

Initialization & Update

Instructions for updating firmware and initializing the device.

PCB Diagram

DA-E750 Wiring Diagram

Wiring connections for the DA-E750 model, showing interconnections between assemblies.

DA-E760 Wiring Diagram

Wiring connections for the DA-E760 model, showing interconnections between assemblies.

MAIN PCB Top

Top view of the Main Printed Circuit Board with component layout.

Pin Connection

Detailed pin connections for various connectors on the PCBs.

Test Point Wave Form

Wave form images for specific test points on the PCB.

MAIN PCB Bottom

Bottom view of the Main Printed Circuit Board with component layout.

SMPS PCB Top

Top view of the Switched-Mode Power Supply (SMPS) PCB.

SMPS PCB Bottom

Bottom view of the Switched-Mode Power Supply (SMPS) PCB.

VT PCB Top

Top view of the VT (Vacuum Tube) Printed Circuit Board.

VT PCB Bottom

Bottom view of the VT (Vacuum Tube) Printed Circuit Board.

JACK PCB Top

Top view of the JACK Printed Circuit Board.

JACK PCB Bottom

Bottom view of the JACK Printed Circuit Board.

REMOTE PCB Top/Bottom

Top and bottom views of the REMOTE Printed Circuit Board.

KEY PCB Top

Top view of the KEY Printed Circuit Board.

Schematic Diagram

DA-E750 Overall Block Diagram

Overall block diagram illustrating the DA-E750 system architecture.

DA-E760 Overall Block Diagram

Overall block diagram illustrating the DA-E760 system architecture.

POWER

Schematic for the power supply section, including voltage regulation and distribution.

JACK/IPOD

Schematic for the JACK and IPOD interface circuits, including charging and data handling.

GAL/AIR/BT/LED

Schematic for Galaxy, Airplay, Bluetooth, and LED indicator circuits.

MICOM

Schematic for the Microcomputer (MICOM) control unit and its connections.

C2+

Schematic related to the C2+ audio processing unit and its interfaces.

AMP SW

Schematic for the amplifier switching circuits and protection block.

AMP FRONT

Schematic for the front amplifier stages, including DAC and output stages.

SMPS

Schematic for the Switched-Mode Power Supply (SMPS) unit.

VT-1

Schematic for the Vacuum Tube (VT) circuit section 1.

VT-2

Schematic for the Vacuum Tube (VT) circuit section 2.

JACK-1

Schematic for the JACK interface, including FA NET, VIDEO, and AUX connections.

JACK-2

Schematic for JACK interface, covering AIRPLAY, DEBUG, ETHERNET, and MICOM.

REMOCON

Schematic for the remote control receiver circuit.

KEY

Schematic for the key input and LED indicator circuits.

Samsung DA-E750 Service Manual

Table of Contents