Section 5: Maintenance. OWON SDS 8202, SDS 7102, SDS 8102, SDS 6062

Section 5: Maintenance

Section 5: Maintenance

5.1 Brief Introduction

In the part, we will provide you the circuit diagram, the replaceable parts, the disassembling method and the maintenance process.

5.2 Preparation and Safety Event

Before disassembling the oscilloscope, please read the safety outline as a warning.

5.3 Circuit Diagram

SDS Series oscilloscope makes up dual channel of digital storage oscilloscope and auto multi-meter which the human machine interface is composed of the keyboard and LCD also with the serial ports and USB interface. The hardware is composed of 5 numbers of modules. The following Figure 10 is the brief diagram.

Figure 10: SDS series block diagram

The schematic circuit diagram of the power supply is as follows:

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SOCBAT

C10

470uF/16V

C9

1000uF/25V

6 7

D4 M

2

D3 1N

1 4

1

D S

3

2

1

4

2

CS

NC

1 R620

GATE

VDD P

NC

RT

COM

GND

8

7

6

5

4 8

2 -X 275 MP X

R2 R2

2

1 3

4

R IG AC _T

U6 TL

6

5 4

3

8 4

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Figure 11: The schematic circuit diagram of the power supply

5.4 Removal and Installation Procedures

This section describes how to remove and install the major mechanical and electrical modules.

Removal procedures are as below. To Install the instrument, you could operate the removal procedure in reverse order. You should pay attention to the “Notice for installation” when installation.

1. Power switch Button z Use a soft cotton to encase the power switch button (to avoid scratching by pliers), pull out the button with pliers.

Figure 12: Remove the Power switch button

Notice for installation: Just press the power switch button to its hole.

2. Ground Connection z Place the oscilloscope face down on soft surface (such as an anti-static mat), with the bottom facing you. z Use a flat-bladed screwdriver to remove the Ground Connection.

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Figure 13: Remove the Ground Connection

3. Battery Box z Place the instrument with the bottom facing you. Loosen the two screws that secure the battery box to the rear chassis (do not take it off).

Figure 14：Loosen the screws of battery box z Take the two screws to pull the battery box out.

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Figure 15: Remove the battery box

Notice for installation:

Assemble the battery box as the figure below; insert it into the battery box container.

Figure 16: Assemble the battery box

4. Rear Panel z Remove the four screws that secure the rear panel with a cross-screwdriver.


The shortest screw should be installed in the screw hole marked in red in the third figure below.

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Figure 17: Remove the screws of rear panel z Place the oscilloscope on its feet on soft surface, with the front facing you. z Release the snap marked in red in the figure below.

Figure 18: Unsnap the rear panel (1) z Place the instrument upside down, release the two snaps marked in red in the figure below.

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Figure 19: Unsnap the rear panel (2) z Detach the rear panel carefully, be ware that it still be connected to the font assembly by wires. z In the figure below, the red and black cable is the AC line power cable; the yellow is the grounding wire. Remove the screw secure the grounding wire to disconnect it. Grasp and pull up on the AC line power cable to disconnect it from power supply board.

Figure 20: Disconnect the rear panel

5. Battery box Container z Remove the four screws marked in yellow in the figure below. z Lift the battery box container a little, be ware that it is still be connected by the battery power cable, which marked in red in the figure below.

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Section 5: Maintenance z Grasp and pull out the battery power cable.

Figure 21: Remove the battery box container

6. Power supply Board z The cable marked in yellow is the power cable of adapter plate, the red is transfer cable.

Disconnect both of them.

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Figure 22: Cables to power supply board z Remove the three screws marked in yellow, lift off the power supply board.

7. Adapter plate

Figure 23: Screws of power supply board

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Section 5: Maintenance z Unlock the screen data cable, pull it out carefully.

Figure 24: Disconnect the screen data cable z The cable marked in blue in the figure below is the high-tension cable, green is the indicator light cable, and red is VGA cable. Pull out the three cables. z Remove the four screws marked in yellow in the figure below.

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Figure 25: Screws and cables of the adapter plate z Pull out the adapter plate carefully.

Figure 26: Remove the adapter plate

8. Chassis (including Fan and LCD)

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Section 5: Maintenance z Remove the plastic cushion marked in the figure below.

Figure 27: Remove plastic cushion z Remove the six screws marked in the figure below. Lift the chassis a little, be aware that it is still connected to the main board by a cable.

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Figure 28: Screws of the chassis z Grasp and pull up on the fan power cable marked in the figure below.

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Figure 29: Fan power cable of the chassis


Make sure that the label of the LCD protection do not be covered by the front panel.

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Figure 30: Install the chassis (1) z Pull the indicator light cable and VGA cable through the holes in the chassis as the figure below.

Figure 31: Install the chassis (2)

9. Main Board z Remove the three screws marked in the figure below, lift off the main board.

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Figure 32: Screws secure the main board


The 2×6-Pin interface of main board should be matched to the one marked in the Figure 34.

Figure 33: Install the main board

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10. Done. The left assembly include key board and front panel.

Figure 34: Key board and front panel

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5.6 Examination and Maintenance

Power on the oscilloscope.

Does the display backlight light up?

No

Yes

Proceed to Figure 36 .

Does the scope display normally?

Yes

No

Dose the test signal of

1KHz/5V output normally?

Yes

No

Replace

Main board.

Are the Main board and

LCD connected correctly?

Yes Replace the

LCD.

No

Reconnect loose cables.

Replace

Main board.

Does the oscilloscope operate OK?

Yes

No

Done.

Figure 35: Troubleshooting procedure (1)

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Figure 36: Troubleshooting procedure (2)

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Section 5: Maintenance. OWON SDS 8202, SDS 7102, SDS 8102, SDS 6062

Section 5: Maintenance

5.1 Brief Introduction

5.2 Preparation and Safety Event

5.3 Circuit Diagram

5.4 Removal and Installation Procedures

5.6 Examination and Maintenance

Key Features

Related manuals

Frequently Answers and Questions

What is the warranty period for the SDS series oscilloscopes?

How do I perform auto-calibration on the SDS series oscilloscopes?

What is the maximum input voltage for the SDS series oscilloscopes?

Table of contents

Section 5: Maintenance. OWON SDS 8202, SDS 7102, SDS 8102, SDS 6062