YOKOGAWA DL1720, DL1740 Service manual

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Page 1

Service Manual

DL1720/DL1740 Digital Oscilloscope

SM 701710-01E

4th Edition

Page 2

Important Notice to the User

This manual contains information for servicing YOKOGAWA’s DL1720 and DL1740

Digital Oscilloscopes, in particular the DL1740. Check the serial number to confirm that

this is the correct service manual for the instrument to be serviced.

wrong manual

Do not use the

Before any maintenance and servicing,

Only properly trained personnel

may carry out the maintenance and servicing described

read all safety precautions carefully

in this service manual.

Do not disassemble the instrument or its parts

, unless otherwise clearly permitted by this

service manual.

Do not replace any part or assembly

, unless otherwise clearly permitted by this service

manual.

In principle, Yokogawa Electric Corporation (YOKOGAWA) does not supply parts other

than those listed in the customer maintenance parts list in this service manual (mainly

modules

whole assembly and

and

assemblies

not

). Therefore if an assembly fails, the user should replace the

components within the assembly (see “Note”). If the user

attempts to repair the instrument by replacing individual components within the

assembly, YOKOGAWA assumes no responsibility for any consequences such as

defects in instrument accuracy, functionality, reliability, or user safety hazards.

YOKOGAWA does not offer more detailed maintenance and service information than

that contained in this service manual.

All reasonable efforts have been made to assure the accuracy of the content of this

service manual. However, there may still be errors such as clerical errors or omissions.

YOKOGAWA assumes no responsibility of any kind concerning the accuracy or contents

of this service manual, nor for the consequences of any errors.

any means without the express written prior permission of YOKOGAWA. The contents

of this manual are subject to change without notice.

Note

YOKOGAWA instruments have been designed in a way that the replacement of electronic

parts can be done on an assembly (module) basis by the user. YOKOGAWA instruments

have also been designed in a way that troubleshooting and replacement of any faulty

assembly can be done easily and quickly. Therefore, YOKOGAWA strongly recommends

replacing the entire assembly over replacing parts or components within the assembly. The

reasons are as follows:

• The instruments use high-performance microprocessors, large scale CMOS gate arrays,

and surface-mount components to provide state-of-the-art performance and functions.

• Repair of components can only be performed by specially trained and qualified

maintenance personnel with special highly-accurate tools, including costly ones.

• When taking the service life and cost of the instruments into consideration, the

replacement of assemblies offers the user the possibility to use YOKOGAWA instruments

more effectively and economically with a minimum in downtime.

• Zip is a trademark or registered trademark of Iomega Corporation in the United States

and/or other countries.

• Adobe and Acrobat are trademarks of Adobe System incorporated.

Disk No. SM12

SM 701710-01E

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Introduction

Safety Precautions

This manual contains information for servicing YOKOGAWA’s DL1720 and DL1740

Digital Oscilloscopes.

Note

This is the fourth edition of the manual, dated July 2002.

WARNING

This service manual is to be used by properly trained personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so. Refer to the safety precautions prior to performing any servicing. Even if servicing is carried out according to this service manual, or by qualified personnel, YOKOGAWA assumes no responsibility for any result occurring from that servicing.

The following general safety precautions must be taken during all phases of operation,

service, and repair of this instrument. Failure to comply with these precautions or with

specific warnings given elsewhere in this manual violates safety standards of design,

manufacture, and intended use of the instrument.

Yokogawa Electric Corporation assumes no liability for the customer’s failure to comply

with these requirements.

WARNING

Use the Correct Power Supply

Ensure the source voltage matches the voltage of the power supply before turning ON the power.

Use the Correct Power Cord and Plug

To prevent an electric shock or fire, be sure to use the power supply cord supplied by YOKOGAWA. The main power plug must be plugged in an outlet with a protective grounding terminal. Do not invalidate protection by using an extension cord without protective grounding.

Connect the Protective Grounding Terminal

The protective grounding terminal must be connected to ground to prevent an electric shock before turning ON the power.

Do Not Impair the Protective Grounding

Never cut off the internal or external protective grounding wire or disconnect the wiring of the protective grounding terminal. Doing so creates a potential shock hazard.

Do Not Operate with Defective Protective Grounding or Fuse

Do not operate the instrument if you suspect the protective grounding or fuse might be defective.

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Use the Correct Fuse

To prevent fire, make sure to use a fuse of the specified rating for current, voltage, and type. Before replacing the fuses, turn OFF the power and disconnect the power source. Do not use a different fuse or short-circuit the fuse holder.

Do Not Operate Near Flammable Materials

Do not operate the instrument in the presence of flammable liquids or vapors. Operation of any electrical instrument in such an environment constitutes a safety hazard.

Do Not Remove Any Covers

There are some components inside the instrument containing high voltage. Do not remove any cover, if the power supply is connected. The cover should be removed by qualified personnel only.

Ground the Instrument before Making External Connections

Connect the protective grounding before connecting the instrument to a measurement or control unit.

Safety Symbols Used on Equipment and in Manuals

WARNING

CAUTION

To avoid injury, death of personnel or damage to the

instrument, the operator must refer to an explanation in the

user’s manual.

This symbol represents a functional grounding terminal.

Such terminals should not be used as a protective

grounding terminal.

A WARNING sign calls attention to a procedure, practice, or

condition, that could result in the injury or death of personnel

if not correctly performed or adhered to.

A CAUTION sign calls attention to a procedure, practice, or

condition, that could result in damage to or the destruction

of part of the instrument if not correctly performed or

adhered to.

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Overview of This Manual

This manual is meant to be used by qualified personnel only. Make sure to read the

safety precautions at the beginning of this manual as well as the warnings and cautions

contained in the chapters relevant to any servicing you may be carrying out.

This manual contains the following chapters.

1 General Information

Provides an introduction and safety considerations.

2 Performance Testing

Explains the tests for checking the performance of the instrument.

3 Adjustments

Explains the adjustments which can be performed by users.

4 Principles of Operation

Provides function block diagrams and explains the principles of operation.

5 Troubleshooting

Presents procedures for troubleshooting and how to proceed in case parts need to be

replaced.

6 Schematic Diagram

Provides a system configuration diagram.

7 Customer Maintenance Parts List

Contains exploded views and a list of replaceable parts.

8 Procedures for Disassembly

Lists the steps required to remove parts from the instrument.

Specifications are not included in this manual. For specifications, refer to IM 701710-01E.

SM 701710-01E

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Important Notice to the User .......................................................................................................... 1

Introduction..................................................................................................................................... 2

Safety Precautions ......................................................................................................................... 2

Overview of This Manual ................................................................................................................ 4

Chapter 1 General Information

1.1 Introduction ........................................................................................................................... 1-1

1.2 Safety Considerations .......................................................................................................... 1-1

Chapter 2 Performance Testing

2.1 Introduction ........................................................................................................................... 2-1

2.2 Test Environment .................................................................................................................. 2-1

2.3 Equipment Required for the Performance Test .................................................................... 2-1

2.4 Self Diagnosis ...................................................................................................................... 2-1

2.5 Vertical Axis DC Voltage Accuracy Test................................................................................ 2-2

2.6 Frequency Response Test.................................................................................................... 2-3

2.7 Time-Base Accuracy Test ..................................................................................................... 2-5

2.8 Trigger Sensitivity Test ......................................................................................................... 2-6

2.9 Trigger Accuracy Test ........................................................................................................... 2-8

Chapter 3 Adjustments

3.1 Introduction ........................................................................................................................... 3-1

3.2 Test Environment .................................................................................................................. 3-1

3.3 Equipment Required ............................................................................................................. 3-2

3.4 DC Gain Adjustment on the AD Board ................................................................................. 3-2

3.5 Flatness Adjustment on the Analog Board ........................................................................... 3-6

Chapter 4 Principles of Operation

4.1 Introduction ........................................................................................................................... 4-1

4.2 Function of Each Assembly .................................................................................................. 4-1

4.3 Function of Each ASIC ......................................................................................................... 4-4

Chapter 5 Troubleshooting

5.1 Introduction ........................................................................................................................... 5-1

5.2 Flowchart .............................................................................................................................. 5-1

5.3 Power Supply Secondary Voltage ........................................................................................ 5-5

5.4 Self Test ................................................................................................................................ 5-6

5.4.1 Key Board Test................................................................................................................. 5-6

5.4.2 Memory Test .................................................................................................................... 5-7

5.4.3 FDD Test .......................................................................................................................... 5-7

5.4.4 Zip Test ............................................................................................................................ 5-8

5.4.5 SCSI Test ......................................................................................................................... 5-8

5.4.6 Printer Test ....................................................................................................................... 5-9

5.4.7 Accuracy Test ................................................................................................................. 5-10

Chapter 6 Schematic Diagram

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Contents

Chapter 7 Customer Maintenance Parts List

7.1 Customer Maintenance Parts List ........................................................................................ 7-1

7.2 Standard Accessories........................................................................................................... 7-5

Chapter 8 Procedures for Disassembly

8.1 Removing the Top Cover ...................................................................................................... 8-1

8.2 Removing the Printer Case .................................................................................................. 8-3

8.3 Removing the Front Bezel .................................................................................................... 8-5

8.4 Removing the AD Board Assembly and the Analog Assembly ............................................. 8-7

8.5 Removing the Power Supply .............................................................................................. 8-12

8.6 Removing the CPU Board Assembly, SCSI Board Assembly, and the Ether Assembly ..... 8-14

8.7 Removing the Front Frame ................................................................................................ 8-16

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Chapter 1 General Information

1.1 Introduction

This manual describes servicing information for any YOKOGAWA DL1720 and DL1740

Digital Oscilloscope. This chapter contains information required for using this manual

and information that must be read before starting servicing DL1720 and DL1740

instruments.

1.2 Safety Considerations

You must thoroughly read the safety precautions at the beginning of this manual. Also

fully read the warnings and cautions contained in each chapter.

General Information

SM 701710-01E

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Chapter 2 Performance Testing

2.1 Introduction

The aim of the tests in this chapter is to check the basic performance of the instrument.

The order of the test procedures is just for convenience and does not need to be

adhered to strictly. Please use the recommended equipment or their equivalents.

2.2 Test Environment

Operating Conditions

• Ambient temperature: 23 ±2°C

• Humidity: 55 ±10% RH

• Voltage of power supply: Specified voltage ±1%

• Frequency of power supply: Specified frequency ±1%

Warm Up Time

• More than 30 minutes after turning ON the instrument.

• Confirm that self-calibration is correctly executed after the 30 minute warm up.

(Be sure to pay attention to the warm up time of all equipment that will be used in

the test.)

2.3 Equipment Required for the Performance Test

Equipment Qty Mandatory Specifications Recommended

Calibrator 1 Accuracy ±0.05% WAVETEK 9500

Output voltage –40 V to 40 V Output resolution 1 mV Output frequency range 0.1 MHz to 500 MHz

Programmable head 1 WAVETEK 9520

Performance Testing

2.4 Self Diagnosis

Equipment Required

None

Procedure

Follow the procedure described in section 15.3, “Self-Diagnostic Test (Self Test)” of the

user’s manual (IM 701710-01E).

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2.5 Vertical Axis DC Voltage Accuracy Test

Specifications

2 mV/div to 50 mV/div: ±(1.5% of 8 div. +0.2 mV)

100 mV/div to 500 mV/div: ±(1.5% of 8 div. +2 mV)

1 V/div to 10 V/div: ±(1.5% of 8 div. +20 mV)

Permissible Range

Range Tolerance

2 mV/div ±0.44 mV 5 mV/div ±0.8 mV 10 mV/div ±1.4 mV 20 mV/div ±2.6 mV 50 mV/div ±6.2 mV 100 mV/div ±14 mV 200 mV/div ±26 mV 500 mV/div ±62 mV 1 V/div ±140 mV 2 V/div ±260 mV 5 V/div ±620 mV 10 V/div ±1.22 V

Equipment Required

Equipment Qty Mandatory Specifications Recommended

Calibrator 1 Accuracy ±0.05% WAVETEK 9500

Programmable Head 1 WAVETEK 9520

Output voltage –40 V to 40 V Output resolution 1 mV

Connection

DL1720/DL1740

Calibrator

Programable Head

Procedure

1. Turn on the power source to the DL1720/DL1740. After warm-up press the

key, followed by the Calibration soft key, then press the Cal Exec soft key to

calibrate the instrument.

Next, press the

SETUP

key, then press the Initialize soft key to initialize the

settings.

MISC

2-2

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2.5 Vertical Axis DC Voltage Accuracy Test/2.6 Freqency Response Test

2. Enter the settings on the DL1720/DL1740 oscilloscope as shown below.

VERTICAL (for all channels)

Coupling DC1 MΩ

V/div According to the inspection item below

Probe 1:1

HORIZONTAL

T/div 1 ms/div

TRIGGER

Mode Auto

ACQ

Mode Box Average

Count Infinite

DISPLAY

Format Single

MEASURE

Mode ON

Item Set Up ▼ (Set to channel to be measured)

Select Avg.

Time Range 1 –5 div

Time Range 2 +5 div

Performance Testing

3. Input the following voltages from the voltage generator to the DL1720/DL1740

being tested, read the indication on the DL1720/DL1740 (value of Avg), and

compare the reading with the tolerance.

Measurement Range Test Input Voltage Tolerance

2 mV/div –8, 0, +8 mV ±0.44 mV 5 mV/div –20, 0, +20 mV ±0.8 mV 10 mV/div –40, 0, +40 mV ±1.4 mV 20 mV/div –80, 0, +80 mV ±2.6 mV 50 mV/div –200, 0, +200 mV ±6.2 mV 100 mV/div –400, 0, +400 mV ±14 mV 200 mV/div –800, 0, +800 mV ±26 mV 500 mV/div –2, 0, +2 V ±62 mV 1 V/div –4, 0, +4 V ±140 mV 2 V/div –8, 0, +8 V ±260 mV 5 V/div –20, 0, +20 V ±620 mV 10 V/div –40, 0, +40 V ±1.22 V

4. Test all channels in the same manner.

2.6 Frequency Response Test

Specifications

DC50 Ω (1 V/div to 10 mV/div) DC to 500 MHz (–3 dB point)

DC50 Ω (2 mV/div and 5 mV/div) DC to 400 MHz (–3 dB point)

SM 701710-01E

Permissible Range

Range Input Amplitude (p-p) Input Frequency Permissible Range (Sdev)

1 V/div 5 V 500 MHz 1.26 V to 1.98 V 200 mV/div 1.2 V 500 MHz 301 mV to 476 mV 50 mV/div 0.3 V 500 MHz 75.1 mV to 119 mV 10 mV/div 60 mV 500 MHz 15.1 mV to 23.8 mV 5 mV/div 30 mV 400 MHz 7.51 mV to 11.9 mV 2 mV/div 12 mV 400 MHz 3.01 mV to 4.76 mV

2-3

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2.6 Frequency Response Test

Equipment Required

Equipment Qty Mandatory Specifications Recommended

Calibrator 1 Output voltage 0 V to 10 V WAVETEK 9500

Programmable Head 1 WAVETEK 9520

Connection

Procedure

1. Turn on the power source to the DL1720/DL1740. After warm-up press the

Output resolution 1 mV Output frequency range 0.1 MHz to 500 MHz

DL1720/DL1740

Calibrator

Programable Head

key, followed by the Calibration soft key, then press the Cal Exec softkey to

calibrate the instrument.

Next, press the

SETUP

key, then press the Initialize soft key to initialize the

settings.

MISC

2. Enter the settings on the DL1720/DL1740 as shown below.

VERTICAL (for all channel)

Coupling DC50 Ω

V/div Set this according to following measurement

conditions

Probe 1:1

HORIZONTAL

T/div 2 ns/div

TRIGGER SIMPLE

Mode Normal

SIMPLE

Source (Channel to be tested)

ACQ

Mode Average

Count Infinite

Weight 4

Record Length 1 k

DISPLAY

Format Single

MEASURE

Mode ON

Item Set up ▼ (Set to channel to be tested)

Select Sdev

Time Range 1 –5.00 div

Time Range 2 +5.00 div

2-4

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3. Input voltages as listed on the following table to the DL1720/DL1740 you are

testing, and check if the automatically measured value of waveform parameters

(Sdev) is within the permissible range.

Range Input Amplitude (p-p) Input Frequency Permissible Range (Sdev)

4. Test all channels in the same manner.

2.7 Time-Base Accuracy Test

Specifications

±0.005%

Permissible Range

Time Range Input Frequency Permissible Range

2 µs/div 500.2 MHz 200±25 kHz 5 µs/div 200.1 MHz 100±10 kHz

2.6 Frequency Response Test / 2.7 Time-Base Accuracy Test

Performance Testing

Equipment Required

Equipment Qty Mandatory Specifications Recommended

Calibrator 1 300 mVp-p, sine wave WAVETEK 9500

Programmable Head 1 WAVETEK 9520

200.1 MHz and 500.2 MHz

Connection

DL1720/DL1740

Calibrator

Programable Head

Procedure

1. Turn on the power source to the DL1720/DL1740. After warm-up press the

key, followed by the Calibration soft key, then press the Cal Exec softkey to

calibrate the instrument.

Next, press the

SETUP

key, then press the Initialize soft key to initialize the

settings.

MISC

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2.7 Time-Base Accuracy Test/2.8 Trigger Sensitivity Test

2. Enter the settings on the DL1720/DL1740 as shown below.

VERTICAL

CH1

V/div 50 mV/div

Coupling DC50 Ω

Probe 1:1

HORIZONTAL

T/div According to the inspection item below

Display

Format Single

ACQ

Record Length 10k

MEASURE

Mode ON

Item Set up ▼

3. Input a 300 mVp-p sine wave signal with the input frequency listed in the table

below to the DL1720/DL1740 you are testing, and check if the automatically

measured waveform parameters (Freq) are within the permissible range.

Time Range Input Frequency Permissible Range (Freq)

2 µs/div 500.2 MHz 200±25 kHz 5 µs/div 200.1 MHz 100±10 kHz

CH1 Select Freq

2.8 Trigger Sensitivity Test

Specifications

DC to 500 MHz: 1 divp-p on the screen

Permissible Range

500 mV/div 500 MHz 1 divp-p on the screen

Equipment Required

Equipment Qty Mandatory Specifications Recommended

Calibrator 1 500 mVp-p, 500 MHz, sine wave WAVETEK 9500 Programmable Head 1 WAVETEK 9520

Connection

DL1720/DL1740

Calibrator

2-6

Programable Head

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2.8 Trigger Sensitivity Test

Procedure

1. Turn on the power source to the DL1720/DL1740. After warm-up press the

key, followed by the Calibration soft key, then press the Cal Exec softkey to

calibrate the instrument.

Next, press the

settings.

2. Enter the settings on the DL1720/DL1740 as shown below.

VERTICAL (for all channels)

HORIZONTAL

TRIGGER

Mode Normal

ENHANCED

DISPLAY

ACQ

SETUP

key, then press the Initialize soft key to initialize the

V/div 500 mV/div

Coupling DC50 Ω

Probe 1:1

T/div 1ns/div

Type Pattern

Set Pattern ▼

Clock CH (Set to channel to be measured)

Slope ↑ (channel to be measured)

X (the other channel)

Condition True

Level / Coupling ▼

Level 0 mV

Coupling DC

Format Single

Record Length 1 k

Mode Average

Count Infinite

Weight 4

MISC

Performance Testing

SM 701710-01E

3. Input a sine wave signal of 500 mVp-p, 500 MHz to the DL1720/DL1740, and

confirm that the waveform stabilizes.

Note

If the trigger is not activated, adjust the trigger lever within ±250 mV until the trigger is activated.

4. Test all channels in the same manner.

2-7

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2.9 Trigger Accuracy Test

Specifications

±(1 div.+10% of the trigger level)

Permissible Range (at 200 mV/div)

Trigger level Offset Permissible Range

600 mV 600 mV –260 mV ≤ (Vin + Vout) / 2 ≤ 260 mV –600 mV –600 mV –260 mV ≤ (Vin + Vout) / 2 ≤ 260 mV

Equipment Required

Equipment Qty Mandatory Specifications Recommended

Calibrator 1 400mVp-p, 2kHz, sine wave WAVETEK 9500 Programmable Head 1 WAVETEK 9520

Connection

DL1720/DL1740

Calibrator

Programable Head

Procedure

1. Turn on the power source to the DL1720/DL1740. After warm-up press the

key, followed by the Calibration soft key, then press the Cal Exec softkey to

calibrate the instrument.

Next, press the

SETUP

key, then press the Initialize soft key to initialize the

settings.

MISC

2-8

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2.9 Trigger Accuracy Test

2. Enter the settings on the DL1720/DL1740 oscilloscope as follows.

VERTICAL (for all channels)

V/div 200 mV/div

Probe 1:1

Band Width 20 MHz

Offset –600 mV, 600 mV

HORIZONTAL

T/div 100 µs/div

TRIGGER

ENHANCED

Type OR

Window ON

Set Pattern ▼

IN, OUT (channel to be measured)

– (the other channel)

Level / Coupling ▼

Center –600 mV, 600 mV

Width 1.2 V

DISPLAY

Format Single

CURSOR

Type Marker

Position 0.0 div

Performance Testing

3. Input a sine wave signal of 400 mVp-p, 2 kHz to the DL1720/DL1740 oscilloscope,

and use cursors to read the voltage of the waveform at the trigger position. Set Vin

for Polarity IN, Vout for Polarity out, and check if (Vin+Vout)/2 is within the

permissible range.

Trigger level Offset Permissible Range

600 mV 600 mV –260 mV ≤ (Vin + Vout) / 2 ≤ 260 mV –600 mV –600 mV –260 mV ≤ (Vin + Vout) / 2 ≤ 260 mV

4. Test all channels in the same manner.

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Chapter 3 Adjustments

3.1 Introduction

The top cover, printer cover, printer case, front bezel, and shield cover must be removed

before adjusting the DL1720/DL1740. Read the warning and cautions below before

doing so.

Circuit patterns of the printed circuit board are exposed. Be careful when handling so that hands or fingers are not injured by the protruding pins.

• Circuit patterns of the printed circuit board are exposed. If these patterns touch other metallic materials, electrical shorting will occur, causing the circuit to be damaged or burnt.

• It is sometimes necessary to turn the DL1720/DL1740 upside down for adjustment. Do not drop the instrument, or allow it to fall over.

• When feeding power with the DL1740’s cover open, apply a flow of air to the AD4 board (or the AD2 board for the DL1720) and Power Supply (B9989YA).

Adjustments

WARNING

CAUTION

3.2 Test Environment

Operating Conditions

Warm Up Time

• Ambient temperature: 23 ±2˚C

• Humidity: 55 ±10 % RH

• Voltage of power supply: Specified voltage ±1 %

• Frequency of power supply: Specified frequency ±1 %

• More than 30 minutes after tuning ON the instrument.

• Confirm that self calibration is correctly executed after a 30 minute warm up.

(Be sure to pay attention to the warm up time of all equipment that will be used in

the test.)

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3-1

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3.3 Equipment Required/3.4 DC Gain Adjustment on the AD Board

3.3 Equipment Required

Table 3.1 Equipment required

Equipment Critical Specification Recommended

Calibrator DC WAVETEK 9500 Programmable Head Output Level : 1 V WAVETEK 9520

Accuracy : < 0.02% Square wave Frequency : 10 kHz Output Level : > 60 Vp-p

Note

The values shown in the specification column are those set in this service manual. These

values do not indicate the performances of the recommended equipment and tools.

Therefore, non-designated equipment and tools which satisfy the specifications are permitted.

3.4 DC Gain Adjustment on the AD Board

Procedure

1. Remove the top cover and shield cover.

2. Allow the unit to warm up for 10 minutes or more.

3. Connect each instrument as shown in figure 3.1, “Connection Method.”

DL1720/DL1740

Calibrator

Programable Head

Figure 3.1 Connection Method

4. Press the

5. Press the

SETUP

key and select the Initialize soft key to execute initialization.

MISC

key and select the Calibration soft key.

6. Press the Cal Exec soft key to perform calibration.

3-2

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3.4 DC Gain Adjustment on the AD Board

7. Enter the settings on the DL1720/DL1740 and calibrator as follows.

DL1720/DL1740

VERTICAL (for all channels)

HORIZONTAL

TRIGGER

Calibrator

8. Adjust the variable resistor (refer to table 3.2, “Adjustment Point” and figure 3.2,

3.3, “Adjustment Point Location Diagram”) corresponding to each channel so that

the DC waveform fits within 1 V±1 mV as shown in figure 3.4, “Observed

Waveform.”

9. Perform the adjustment in step 7) for all channels.

V/div 2 mV/div

Position 0 div

Probe 1:1

Offset +1.000 V

Bandwidth 20 MHz

T/div 1 ms/div

Mode Auto

ACQ

Mode Box Average

Count Infinite

DISPLAY

Format Single

MEASURE

Mode ON

Item Set Up ▼ (Set to channel to be measured)

Select Avg.

Time Range 1 –5 div

Time Range 2 +5 div

DC Output Level +1.0000 V

Adjustments

Table 3.2 Adjustment Point

Channel Adjustment Point

CH1 R707 CH2 R714 CH3* R721 CH4* R728

* The DL1720 is not equipped with CH3 and CH4

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3.4 DC Gain Adjustment on the AD Board

3-4

R707R714

Figure 3.2 Adjustment Point Location Diagram (DL1720)

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3.4 DC Gain Adjustment on the AD Board

Adjustments

SM 701710-01E

R728

R721

Figure 3.3 Adjustment Point Location Diagram (DL1740)

R707R714

3-5

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3.4 DC Gain Adjustment on The AD Board/3.5 Flatness Adjustment on the Analog Board

Figure 3.4 Observed Waveform

3.5 Flatness Adjustment on the Analog Board

Note

Before performing this flatness adjustment, the DC gain adjustment on the AD board must

have been completed.

Procedure

1. Remove the top cover, printer cover, printer case, front bezel, and shield cover.

2. Turn on the power and allow the unit to warm up for 10 minuets or more.

3. Connect each instrument as shown in figure 3.5, “Connection Method.”

Calibrator

Programable Head

DL1720/DL1740

3-6

Figure 3.5 Connection Method

4. Press the

5. Press the

SETUP

key and select the Initialize soft key to execute initialization.

MISC

key and select the Calibration soft key.

6. Select the Cal Exec soft key to perform calibration.

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3.5 Flatness Adjustment on the Analog Board

7. For adjustment of the /10 range, enter the settings on the DL1720/DL1740

oscilloscope and calibrator as follows.

DL1720/DL1740

VERTICAL (for all channels)

V/div 100 mV/div

Position 0 div

Probe 1:1

HORIZONTAL

T/div 10 µ s/div

TRIGGER

Mode Auto

ACQ

Mode Box Average

Count Infinite

DISPLAY

Format Single

Calibrator

Wave Form Square wave

Frequency 10 kHz

Amplitude 600 mVp-p

8. Adjust the variable capacitors CV101 and CV201, (refer to figure 3.6, “Adjustment

Point Location Diagram”) so that the top of the waveform becomes flat as shown in

figure 3.7, “Observed Waveform.” The flatness of the waveform must be fitted

within ±0.1 div.

9. For adjustment of the /100 range, enter the settings on the DL1720/DL1740

oscilloscope and calibrator as follows.

DL1720/DL1740

VERTICAL (for all channels)

V/div 1 V/div

Position 0 div

Probe 1:1

HORIZONTAL

T/div 10 µ s/div

TRIGGER

Mode Auto

ACQ

Mode Box Average

Count Infinite

DISPLAY

Format Single

Calibrator

Wave Form Square wave

Frequency 10 kHz

Amplitude 6 Vp-p

10. Adjust the variable capacitors CV102 and CV202 (refer to figure 3.6, “Adjustment

Point Location Diagram”) so that the top of the waveform becomes flat as shown in

figure 3.7, “Observed Waveform.” The flatness of the waveform must be fitted

within ±0.1 div.

Adjustments

SM 701710-01E

3-7

Page 25

3.5 Flatness Adjustment on the Analog Board

11. For adjustment of the /200 range, enter the settings on the DL1720/DL1740

oscilloscope and calibrator as follows.

DL1720/DL1740

VERTICAL (for all channels)

HORIZONTAL

TRIGGER

ACQ

DISPLAY

Calibrator

Wave Form Square wave

Frequency 10 kHz

Amplitude 60 Vp-p

12. Adjust the variable capacitors CV103 and CV203 (refer to figure 3.6, “Adjustment

Point Location Diagram” ) so that the top of the waveform becomes flat as shown in

figure 3.7, “Observed Waveform.” The flatness of the waveform must be come

within ±0.1 div.

V/div 10 V/div

Position 0 div

Probe 1:1

T/div 10 µ s/div

Mode Auto

Mode Box Average

Count Infinite

Format Single

CV202

The assembly number differs depending on the date of manufacture as follows: During or before December, 2001: B9989MA After December 2001: B9989ML

CV203

CV103

CV102

CV101

3-8

CV201

Figure 3.6 Adjustment Point Location Diagram

SM 701710-01E

Page 26

Figure 3.7 Observed Waveform

3.5 Flatness Adjustment on the Analog Board

Adjustments

SM 701710-01E

3-9

Page 27

Chapter 4 Principles of Operation

4.1 Introduction

The block diagrams of the DL1720 are shown in figure 4.1 and figure 4.2.

The block diagrams of the DL1740 are shown in figure 4.3 and figure 4.4.

Figure 4.1 and figure 4.3 are block diagrams of the circuit from the analog input to the

data acquisition circuit including the attenuator, one-chip amplifier, analog multiplexer, A/

D converter, trigger comparator, trigger circuit, and the ring buffer memory and its

controller.

Figure 4.2 and figure 4.4 are block diagrams of (1) the data processing section which

processes the acquired data and displays the waveform, (2) the CPU, and (3) the

peripheral circuitry.

4.2 Function of Each Assembly

Analog Board Assembly

The analog board assembly has a coupling switch for AC/DC, 1 MΩ/50 Ω, and GND/

Measure and a switch circuit for the attenuator (1:1, 10:1, 100:1, 200:1). Relays are

used to make the switch. In addition, a one-chip amplifier IC and an analog multiplexer

IC are onboard.

The one-chip amplifier IC has a gain switch circuit, a low-pass filter circuit (external

capacitor), a trigger coupling circuit (external capacitor), and a trigger bandwidth limiting

circuit (external capacitor). In addition, the input offset voltage and the trigger level are

varied using an external DC voltage input. The frequency bandwidth of the IC is

approximately 600 MHz.

Principles of Operation

As indicated in figure 4.1 or figure 4.3, the vertical sensitivity from 10 V/div to 2 mV/div is

achieved by switching the gain on the attenuator and the one-chip amplifier IC.

The analog multiplexer IC is used to achieve the interleave operation. During the

interleave operation, the input signal of CH1 (CH3) is supplied to the A/D converter of

CH2 (CH4). The frequency bandwidth of the IC is approximately 2 GHz.

The above-mentioned control signal, offset, and DC voltage for the trigger level are

supplied by the analog front-end controller (AFC) IC on the AD4 board (or the AD2 board

for the DL1720) assembly.

Table 4.1 Setting Range and Amplifying Level

Setting Range Attenuator Division Ratio Amplifying Rate

2 mV/div 1/1 x25 5 mV/div 1/1 x10 10 mV/div 1/1 x5 20 mV/div 1/1 x2.5 50 mV/div 1/1 x1 100 mV/div 1/10 x5 200 mV/div 1/10 x2.5 500 mV/div 1/10 x1 1 V/div 1/100 x5 2 V/div 1/100 x2.5 5 V/div 1/100 x1 10 V/div 1/200 x1

SM 701710-01E

The setting range here is for the 1:1 probe setting.

4-1

Page 28

4.2 Function of Each Assembly

AD4 Board (or AD2 Board for the DL1720) Assembly

The AD4 board (or AD2 board for the DL1720) assembly has the time base, trigger, A/D

converter, and analog control circuits onboard.

The time base is of a PLL configuration. 1 GHz and 800 MHz can be switched. On the

DL1720/DL1740, the frequency of the clock is converted to 500 MHz or 400 MHz using

high-speed ECL logic and distributed to each channel. When in interleave mode, the

clock for CH2 and CH4 is delayed by 1 ns with respect to the clock for CH1 and CH3,

respectively (the DL1720 is not equipped with CH3 and CH4). For making minute time

measurements of phase difference between the trigger and sampling clock (needed

during repetitive sampling mode, for example), the T-V converter (TVC) is used.

The trigger section consists of a comparator, fast trigger logic (FTL), and pulse width

detector (PWD). It also has a TV trigger circuit used only on CH1. The comparator has

a window comparator function that allows window triggering. The window width is

controlled by an external DC voltage input. The frequency bandwidth of the comparator

IC is approximately 1 GHz.

The A/D converter operates at 500 MHz only when the sampling rate is 500 MS/s or

when in 1 GS/s interleave mode. In all other cases, the A/D converter operates at 400

MHz. Sampling rates of 200 MS/s or lower are attained by extracting a portion of the

data sampled at 400 MHz using the RBC on the ACQ4 board (or the ACQ2 board for the

DL1720) assembly.

The analog control circuit consists of an analog front-end controller (AFC), a PWM D/A

converter, and a serial/parallel converter. This circuit controls the analog section of the

analog board assembly and the AD board assembly. There are also EXT CLOCK IN,

EXT TRG IN, and TRG GATE IN functions, as well as an active probe power supply (/P4

or /P2 for the DL1720) circuit.

ACQ4 Board (or ACQ2 Board for the DL1720) Assembly

The ACQ4 board (or the ACQ2 board for the DL1720) assembly has a primary data

processing section, a secondary data processing section, and a display section (for

displaying waveforms and other information).

The primary data processing section consists of the ring buffer memory (PBSRAM) and

controller (RBC). The RBC receives the data that is transferred from the A/D converter

on the ACQ4 board (or the ACQ2 board for the DL1720) assembly and performs the

primary data processing such as the above-mentioned data extraction of sampled data,

envelope, and box averaging, then stores the data in the ring buffer memory. The

written data are transferred to the acquisition memory interface (AMI) in the secondary

data processing section according to the trigger address.

The secondary data processing section consists of the AMI, work memory (PBSRAM),

and the acquisition memory (synchronous DRAM). The AMI processes the data

(averaging, for example) that is transferred from the RBC and stores the result in the

acquisition memory. Then, the AMI converts the stored data to display data by

performing additional processing such as compression and interpolation. The resultant

data are transferred to the graphic control process (GCP) according to the display

update interval. The AMI also has computation functions (addition, subtraction,

multiplication, division, differentiation, integration, etc.) and auxiliary functions such as

automated measurement of waveform parameters.

4-2

SM 701710-01E

Page 29

4.2 Function of Each Assembly

The display section consists of a GCP, graphic memory (synchronous GRAM), character

memory (fast SRAM), and VGA VIDEO OUT circuits. The GCP writes the waveform

data that are transferred from the AMI to the graphic memory. It synthesizes the

contents of the graphic memory and the character memory and displays them on the

TFT color LCD. The GCP also controls the built-in printer.

CPU Board Assembly

The CPU board consists of each circuit block’s control circuit, an I/O circuit, and other

peripheral circuits.

A Hitachi HD6417709A is used for the CPU. The actions of each circuit block connected

to the CPU bus are controlled by the CPU.

The main memory (synchronous DRAM) and Flash memory are included in the CPU’s

peripheral circuits.

In the I/O circuit, the following circuits carry out control through the CIO (CPU I/O

interface IC). They are the backup memory, keyboard, floppy disk drive controller (Zip

drive circuit), GP-IB controller, USB I/F circuit, and SCSI controller (option:/C7). On the

CPU bus, they are the Ethernet I/F (option:/C10)circuit, and the serial I/F circuit.

Key Board Assembly

Key switches, LEDs, the rotary encoder, and the jog shuttle are installed on the key

board assembly.

ADP Board Assembly

The ADP board assembly distributes the power supply output from the ACQ4 board (or

the ACQ2 board for the DL1720) to the AD4 board assembly.

BUS Board Assembly

Controls the exchange of signals between the CPU, KEY, ACQ4 (or the ACQ2 for the

DL1720), and AD board assemblies and a printer assembly. Supplies output from the

power supply unit to the CPU, KEY, ADP and ACQ4 board (or the ACQ2 board for the

DL1720) assemblies and a printer assembly. +12 V generation takes place on this

board.

Principles of Operation

SM 701710-01E

LCD Board Assembly

The LCD board assembly converts the connector of the LCD signal cable.

LCD Assembly

6.4-inch color TFT LC display

Full display resolution: 640 x 480

Waveform display resolution: 500 x 384

Printer Assembly (Optional)

The printer is of a thermal sensitivity type that prints 8 dots per mm and 832 dots per

line. A hardcopy of the display is printed in approximately 12 seconds.

FDD Assembly (-J1)

The FDD assembly supports 3.5-inch floppy disks (720 KB and 1.44 MB formats).

Zip Assembly (-J2)

The Zip assembly supports both 100 MB and 250 MB capacity media.

4-3

Page 30

4.2 Function of Each Assembly/4.3 Function of Each ASIC

Zip Board Assembly (-J2)

The Zip board assembly is an adapter which connects the Zip drive to the CPU board.

I/F Board Assembly (Optional)

The I/F board assembly supports both SCSI I/F and serial I/F, and is controlled by the

CPU and CPU I/O interface (CIO) on the CPU board.

Ethernet Board Assembly (Optional)

Option /C10 consists of an Ethernet interface section. The Ethernet interface section

has an Ethernet connector and a LAN (local area network) controller. These interfaces

are controlled by the CPU and CPU I/O interface (CIO) that are on the CPU board

assembly.

OPT TRIG Board Assembly (Optional)

Option /F5 consists of I2C BUS trigger section. The OPT TRIG board assembly provide

I2C BUS trigger signal.

4.3 Function of Each ASIC

The following items describe the IC and the gate array function used in each assembly.

Analog Front-End Controller (AFC)

The AFC is a Bi-CMOS gate array. Its main functions are controlling the analog front-

end circuit and assisting the trigger circuit. It includes a PWM signal output circuit used

for D/A conversion, a parallel port, a serial port, a trigger hold-off circuit, an auto trigger

circuit, a TV trigger generator, a fast counter, and a slow counter.

Fast Trigger Logic (FTL)

The FTL is an ECL gate array. Its main functions include generation of trigger signals

according to the trigger functions, trigger hold-off function, and control of the time-to-

voltage converter (TVC).

Pulse Width Detector (PWD)

The PWD is an analog IC. Using an internally-startable oscillator and an external

counter (AFC), it detects the pulse width for width triggering.

Time-to-Voltage Converter (TVC)

This is the analog IC that measures the internal sampling clock and trigger time, and

converts time to voltage.

Ring Buffer Memory Controller (RBC)

The RBC is a Bi-CMOS gate array. It performs primary processing of the data such as

the extraction of the sampled data, envelope, and box averaging. It also provides

functions for controlling the ring buffer memory and the interface to the acquisition

memory interface (AMI).

4-4

Acquisition Memory Interface (AMI)

The AMI is a CMOS gate array. Its functions include interfacing to the ring buffer

memory controller (RBC), interfaceing to the graphic control processor (GCP),

averaging, history control, waveform computation, and auxiliary functions for the

automated measurement of waveform parameters.

SM 701710-01E

Page 31

4.3 Function of Each ASIC

Graphic Control Processor (GCP)

The GCP is a CMOS gate array. Its functions include interfacing to the acquisition

memory interface (AMI), graphic memory and character memory control, a waveform

drawing function (accumulated display, for example), built-in printer control, and display

data generation for the LCD.

CPU I/O Interface (CIO)

The CIO is a CMOS gate array. Its functions include interfacing to the CPU

(HD6417709A) and the peripheral ICs, keyboard control, LED control, interrupt control,

and DMA selection.

I2C BUS Trigger Logic 2 (ITL2)

The ITL2 is field programmable gate array. Its function is generation of I2C BUS trigger

signal.

Principles of Operation

SM 701710-01E

4-5

Page 32

4.3 Function of Each ASIC

CH1/CH2

SRAM

AD2 Board Assembly

SRAM

Control Signal

PROBE POWER X2 (/P2)

PWD

TRIG OUT

TVC

RBC

ACQ2 Board Assembly

Level

Converter

Time Base

AFC

Tr igger

A/D Converter

FTL

Comparator

Multiplexer

one chip Amplifire

AT T

Analog Board Assembly

Coupling

(GND/MES)

Coupling

(1MΩ/50MΩ)

(AC/DC)

Coupling

CH1

CH2

Filter

(20MHz,

DC/AC/

Gain

1/1 1/10

GND/MES

1MΩ/50Ω

AC/DC

100MHz

HFrej

1/100 1/200

To ACQ Board

Assembly

∗

Tr igger Level

Offset

Line Trigger

To CPU Board

∗

Bus Board Assembly

Unit

Power

1/1

1/10

ET2 Board Assembly

EXT.

4-6

Figure 4.1 Block Diagram (Analog Section) of the DL1720

SM 701710-01E

Page 33

Printer(/B5)

4.3 Function of Each ASIC

BUS Board Assembly

Graphic

Memory

Character

LCD

GCP

VGA Video OUT

GPIB

USB

GO/NOGO

Interface Board Assembly (/C7)

SCSI, Serial (/C7)

Ethernet (/C10)

Zip Drive (-J2)

FD Drive (-J1)

Key Board Assembly

Principles of Operation

CIO

GPIB IF

FD Controller

Zip Controller

CPU Board Assembly

CPU

Backup RAM

USB IF

DRAM

PIO

Flash ROM

SCSI + Serial IF

ETHERNET IF

Ethernet Board Assembly (/C10)

ACQ2 Board Assembly

SM 701710-01E

AMI

Work Memory

CH1/CH2

Figure 4.2 Block Diagram (Digital Section) of the DL1720

ACQ Memory

Control Signal

4-7

Page 34

4.3 Function of Each ASIC

CH1/CH2

CH3/CH4

Signal

Control

ACQ4 Board Assembly

AD4 Board Assembly

PROBE POWER X4 (/P4)

SRAM

RBC

Converter

Level

RBC

SRAM

PWD

AFC

Time Base

EXT TRIG IN

TRIG OUT

EXT CLOCK IN

TRIG GATE IN

TVC

FTL

OPT TRIG Board assembly (/F5)

ITL2

TV Trigger

A/D Converter

Multiplexer

Tr igger

Level

Line Trigger

Comparator

To CPU Board

Assembly

∗

To ACQ Board

Assembly

∗

one chip Amplifire

ATT

Analog Board Assembly

Coupling

(GND/MES)

Coupling

(1MΩ/50MΩ)

(AC/DC)

Coupling

CH1

Offset

CH2

CH3

CH4

Figure 4.3 Block Diagram (Analog Section) of the DL1740

AC/DC

Filter

(20MHz

100MHz

HFrej

DC/AC/

Gain

1/1 1/10

1/100 1/200

GND/MES

1MΩ/50Ω

Bus Board Assembly

Unit

Powe r

4-8

SM 701710-01E

Page 35

Printer(/B5)

(-J1)

4.3 Function of Each ASIC

(-J2)

BUS Board Assembly

Memory

Graphic

Memory

Character

LCD

GCP

VGA Video OUT

CPU Board Assembly

GPIB

USB

GO/NOGO

SCSI, Serial (/C7)

Interface Board

Assembly (/C7)

Ethernet (/C10)

Zip Drive

Key Board Assembly

FD Drive

Principles of Operation

CIO

GPIB IF

FD Controller

Zip Controller

CPU

Backup RAM

USB IF

DRAM

PIO

Flash ROM

SCSI + Serial IF

ETHERNET IF

Ethernet Board Assembly (/C10)

ACQ4 Board Assembly

SM 701710-01E

AMI

ACQ Memory

Work Memory

CH1/CH2

Figure 4.3 Block Diagram (Digital Section) of the DL1740

ACQ Memory

AMI

CH3/CH4

Work Memory

Signal

Control

4-9

Page 36

Chapter 5 Troubleshooting

5.1 Introduction

This chapter describes possible solutions for rectifying errors. In such cases, assembly

removal may be required.

Please heed the following warning.

Assembly replacement is to be performed only by qualified service technicians who have experience working with the hazards involved (such as fire and electrical shock).

Note

If an error message is displayed, the error may have been caused by incorrectly operating the

unit. Refer to the user’s manual, and perform the correct operation.

5.2 Flowchart

Figure 5.1, “Troubleshooting Flowchart” shows an analytical method for handling

malfunctions.

WARNING

Troubleshooting

SM 701710-01E

5-1

Page 37

5.2 Flowchart

Power ON

START

LCD OK?

Check the

fuse.

Fuse OK?

Check secondary

voltage of power supply.

Vol tag e OK?

INITIALIZE

LCD OK?

†

Check secondary

voltage of power

supply unconnected

to bus board.

Voltage OK?

(1)

Check each

board for shorts.

Check display.

Connect RGB VIDEO

OUT to monitor.

Replace the fuse.

Replace power

supply unit.

‡

No error

messages?

Execute self test.

Self test

successful?

Execute performance

test.

Performance

test successful?

END

Maintenance Service is Required Contact your nearest YOKOGAWA representative as listed on the back cover of this manual.

(2)

Check error

contents.

(3)

Check self test

results.

(4)

Check

performance

test results.

* See section 5.3 for detailed instructions. † To initialize the settings, reboot the

DL1720/DL1740 while pressing the RESET key.

‡ The monitor to be connected must be VGA

supported.

Figure 5.1 Troubleshooting Flowchart

Monitor

display OK?

Check LCD

backlight.

Backlight

lights up?

Replace CPU

board ass’y.

Replace lamp

unit or

inverter unit.

Replace LCD

ass’y.

5-2

SM 701710-01E

Page 38

SM 701710-01E

5.2 Flowchart

(1)

A short may occur in an assembly other than the power supply unit. To check in which voltage line a short has occurred, investigate each assembly to which voltage is supplied, using a circuit tester. Table 5.1 “Correspondence of Assembly to Voltage”

shows the relationship between assemblies and voltages supplied to them.

Table 5.1 Correspondence of Assembly to Voltage

Voltage Series Assembly No. Assembly

+24 V B9989MJ ACQ2 Board Assembly (MODEL: 701705)

+12 V B9989MG ET2 Board Assembly (MODEL: 701705)

+5 V B9989MG ET2 Board Assembly (MODEL: 701705)

+3.3 V B9989MH AD2 Board Assembly (MODEL: 701705)

–2 V B9989ML

–5.2 V B9989MG ET2 Board Assembly (MODEL: 701705)

–12 V B9989MG ET2 Board Assembly (MODEL: 701705)

* The assembly number differs depending on the date of manufacture as follows:

During or before December, 2001: B9989MA After December, 2001 : B9989ML

B9989MD ACQ4 Board Assembly (MODEL: 701710) B9989ME BUS Board Assembly B9989GP PRINTER Assembly (Option: /B5) B9989SA FAN Assembly

B9989MB AD4 Board Assembly (MODEL: 701710) B9989MB AD4 Board Assembly (MODEL: 701710) B9989MJ ACQ2 Board Assembly (MODEL: 701705) B9989MD ACQ4 Board Assembly (MODEL: 701710) B9989ME BUS Board Assembly B9989MF ADP Board Assembly A1468UP Inverter Unit

B9989ML B9989MH AD2 Board Assembly (MODEL: 701705) B9989MB AD4 Board Assembly (MODEL: 701710) B9989MC CPU Board Assembly B9989MJ ACQ2 Board Assembly (MODEL: 701705) B9989MD ACQ4 Board Assembly (MODEL: 701710) B9989ME BUS Board Assembly B9989MF ADP Board Assembly B9989MK KEY Board Assembly B9989MS I/F Board Assembly (Option: /C7) B9989MT ETHERNET Board Assembly (Option: /C10) B9989MM OPT TRIG Board Assembly (Option: /F5) A1092UN FDD Unit (Model: -J1) A1152UN Zip Drive Unit (Model: -J2)

B9989MB AD4 Board Assembly (MODEL: 701710) B9989MC CPU Board Assembly B9989MJ ACQ2 Board Assembly (MODEL: 701705) B9989MD ACQ4 Board Assembly (MODEL: 701710) B9989ME BUS Board Assembly B9989MF ADP Board Assembly B9989MS I/F Board Assembly (Option: /C7) B9989MT ETHERNET Board Assembly (Option: /C10) B9989MM OPT TRIG Board Assembly (Option: /F5)

B9989MH AD2 Board Assembly (MODEL: 701705) B9989MB AD4 Board Assembly (MODEL: 701710) B9989MJ ACQ2 Board Assembly (MODEL: 701705) B9989MD ACQ4 Board Assembly (MODEL: 701710) B9989ME BUS Board Assembly B9989MF ADP Board Assembly

B9989ML B9989MH AD2 Board Assembly (MODEL: 701705) B9989MB AD4 Board Assembly (MODEL: 701710) B9989MJ ACQ2 Board Assembly (MODEL: 701705) B9989MD ACQ4 Board Assembly (MODEL: 701710) B9989ME BUS Board Assembly B9989MF ADP Board Assembly

ANALOG Board Assembly (MODEL: 701705, 701710)

Troubleshooting

5-3

Page 39

5.2 Flowchart

(2)

When trouble occurs, refer to the user’s manual to determine whether the trouble was

caused by erroneous operation or by a hardware defect. Table 5.2, “Correspondence of

Messages to Defective Assemblies,” shows which kind of trouble may be due to a

hardware failure.

Table 5.2 Correspondence of Messages to Defective Assemblies

Code Message Assembly No. Assembly

713 Calibration failure. ••• B9989MG ET2 Board Assembly (MODEL: 701705)

B9989ML

B9989MH AD2 Board Assembly (MODEL: 701705) B9989MB AD4 Board Assembly (MODEL: 701710) B9989MC CPU Board Assembly B9989MJ ACQ2 Board Assembly (MODEL: 701705) B9989MD ACQ4 Board Assembly (MODEL: 701710) B9989ME BUS Board Assembly B9989MF ADP Board Assembly

901 Failed to backup setup data. ••• B9989MC CPU Board Assembly

906 Fan stopped ••• B9989SA FAN Assembly

907 Backup battery is flat. B9989MC CPU Board Assembly

* The assembly number differs depending on the date of manufacture as follows:

During or before December, 2001: B9989MA After December, 2001 : B9989ML

ANALOG Board Assembly (MODEL: 701705, 701710)

(3)

When trouble occurs, check the test item displaying FAIL and select the relevant

defective item from table 5.3, “Correspondence of Test Items to Defective Assemblies.”

If necessary, replace the relevant assembly.

Table 5.3 Correspondence of Test Item to Defective Assemblies

Test item Assembly No. Assembly

Key Board B9989MC CPU Board Assembly

Memory B9989MC CPU Board Assembly

FDD B9989MC CPU Board Assembly

Zip B9989MC CPU Board Board Assembly

SCSI B9989MC CPU Board Assembly

Printer B9989MC CPU Board Assembly

Accuracy B9989MG ET2 Board Assembly (MODEL: 701705)

* The assembly number differs depending on the date of manufacture as follows:

During or before December, 2001: B9989MA After December, 2001 : B9989ML

B9989ME Bus Board Assembly B9989MK KEY Board Assembly

A1092UN FDD Unit (Model: -J1)

B9989MU Zip Board Assembly A1152UN Zip Drive Unit (Model: -J2)

B9989MS I/F Board Assembly (Option: /C7)

B9989MJ ACQ2 Board Assembly (MODEL: 701705) B9989MD ACQ4 Board Assembly (MODEL: 701710) B9989ME Bus Board Assembly B9989GP Printer Assembly (Option: /B5)

ANALOG Board Assembly (MODEL: 701705, 701710)

5-4

SM 701710-01E

Page 40

5.2 Flow Chart/5.3 Power Supply Secondary Voltage

(4)

When trouble occurs, check the non-conforming test and select the relevant defective

assembly from table 5.4, “Correspondence of Test Items to Defective Assemblies.” If

necessary, replace the relevant assembly.

Table 5.4 Correspondence of Test Item to Defective Assemblies

Test item Assembly No. Assembly

2.5 Vertical Axis DC Voltage Accuracy Test B9989ML B9989MH AD2 Board Assembly (MODEL: 701705) B9989MB AD4 Board Assembly (MODEL: 701710)

2.6 Frequency Response Test B9989ML B9989MH AD2 Board Assembly (MODEL: 701705) B9989MB AD4 Board Assembly (MODEL: 701710)

2.7 Time-base Accuracy Test B9989ML B9989MH AD2 Board Assembly (MODEL: 701705) B9989MB AD4 Board Assembly (MODEL: 701710)

2.8 Trigger Sensitivity Test B9989ML B9989MH AD2 Board Assembly (MODEL: 701705) B9989MB AD4 Board Assembly (MODEL: 701710)

2.9 Trigger Accutracy Test B9989ML B9989MH AD2 Board Assembly (MODEL: 701705) B9989MB AD4 Board Assembly (MODEL: 701710)

* The assembly number differs depending on the date of manufacture as follows:

During or before December, 2001: B9989MA After December, 2001 : B9989ML

ANALOG Board Assembly (MODEL: 701705, 701710)

Troubleshooting

5.3 Power Supply Secondary Voltage

Check whether the power supply secondary voltage fits the values listed on figure 5.2,

“Power Supply Secondary Terminals” and Table 5.5, “Power Supply Secondary

Terminal’s Name.”

Figuer 5.2 Power Supply Secondary Terminals

Table 5.5 Power Supply Secondary Terminal’s Name

Pin No. Name

1 Sense 2, 4 +24 V 5 Remote 6 AC5 V 8 –12 V 10 –5.2 V 13, 14 –2 V 17, 18 +5 V 25-30 +3.3 V 3, 7, 9, 11, 12, 15, 16, 19—24 GND

SM 701710-01E

When checking the secondary voltage of the power supply unit apart from the main unit,

short the remote pin to ground and turn ON the main switch of the power supply unit

located on the rear panel.

5-5

Page 41

5.4 Self Test

After turning the power ON, first press the

MISC

key and then the Next 1/2 soft key.

Press the Self Test soft key and then the Test Item soft key to display the Self Test

menu screen (figure 5.3).

Figure 5.3 Self Test Menu

Press the soft key of the desired self test object.

Figure 5.4 Self Test Item

5-6

5.4.1 Key Board Test

Check the operations of all keys, rotary knobs, and the jog-shuttle on the front panel.

1. Press the Test Item soft key in the Self Test menu, and select Key Board. Press

the Exec soft key to start the key test.

2. The names of each key you press should be inversely displayed on a white

background. To complete the key test, press all the keys at the front panel one by

one. To abort the key test, press the

ESC

key twice.

SM 701710-01E

Page 42

5.4 Self Test

5.4.2 Memory Test

After the memory test is performed, the results are displayed. When the test has been

completed and no problems were detected,

figure 5.5). If a problem was detected,

5.3 to select the relevant defective assembly.

Pass

is displayed on the screen (refer to

Failed

is displayed on the screen. Refer to table

Troubleshooting

Figure 5.5 Execution Results of the Memory Test

5.4.3 FDD Test

After the FDD test is performed, the results are displayed. Insert a floppy disk into the

drive before executing the test. If the test has been completed and no problems were

Pass

detected,

defective assembly.

is displayed on the screen (refer to figure 5.6). If a problem was

Failed

is displayed on the screen. Refer to table 5.3 to select the relevant

SM 701710-01E

Figure 5.6 Execution Results of the FDD Test

5-7

Page 43

5.4 Self Test

5.4.4 Zip Test

After the Zip test is performed, the results are displayed. Insert a Zip disk into the drive

before excuting the test. If the test has been completed and no problems were detected,

Pass

is displayed on the screen (refer to figure5.7). If a problem was detected,

Failed

displayed on the screen. Refer to table 5.3 to select the relevant defective assembly.

Figure 5.7 Execution Results of the Zip Test

5.4.5 SCSI Test

After the SCSI test is performed, the results are displayed. When the test has been

completed and no problems were detected,

figure 5.8). If a problem was detected,

Pass

is displayed on the screen (refer to

Failed

is displayed on the screen. Refer to the

table 5.3 to select the relevant defective assembly.

5-8

Figure 5.8 Execution Results of the Accuracy Test

SM 701710-01E

Page 44

5.4 Self Test

5.4.6 Printer Test

If the DL1720/DL1740 is equipped with the optional printer (/B5), print out the patterns

shown in figure 5.9, “Printer Print Patterns” on the printing paper.

1: Vertically printed lines on alternate dots

2: Checkered pattern every other dot

3: Checkered pattern every other 2 dots

4: Checkered pattern every other 4 dots

5: Checkered pattern every other 8 dots

6: Checkered pattern every other 16 dots

7: Checkered pattern every other 32 dots

8: Checkered pattern every other 64 dots

9: Horizontally printed lines on alternate line

Troubleshooting

SM 701710-01E

Figure 5.9 Printer Print Patterns

5-9

Page 45

5.4 Self Test

5.4.7 Accuracy Test

After the accuracy test is performed, the results are displayed. When the test has been

completed and no problems were detected,

figure 5.10). If a problem was detected,

Pass

is displayed on the screen (refer to

Failed

is displayed on the screen. Refer to the

table 5.3 to select the relevant defective assembly.

Figure 5.10 Execution Results of the Accuracy Test

5-10

SM 701710-01E

Page 46

Chapter 6 Schematic Diagram

ETHERNET

CN2

CN200

SERIAL

SCSI

CN100

CN1

CN4

GP-IB

CN303CN302

GO/NO-GO

CN305 CN306

PRN/KBD USB

(Option: /C7)

B9989MS

I/F BOARD ASSY

B9989MC

(Option: /C10)

B9989MT

ASSY

ETHERNET BOARD

CN1

CN3

CPU BOARD ASSY

FDD

A1092UN

B9989YF

CN307

(Select: -J1)

ASSY

B9989MU

ZIP BOARD

CN1

B9989YG

CN308

(Select: -J2)

CN2

Ferri te core

CN1 CN11

A1152UN

Zip Drive Unit

B9914ZF

(Select: -J2)

Sense Head Motor

CN201 CN202 CN203

(Option: /B5)

PRINTER ASSY

B9989GP

Schematic Diagram

701710(4CH) :

EXT TRG IN

701705(2CH) :

/P4 : B9969SE X 4

/P2 : B9969SE X 2

PROBE POWER(Option: /P4,/P2)

NON

TRG OUT

VIDEO OUT(VGA)

B9989SA

CN5

B9989MD ACQ4

701710(4CH Model) :

CN8

CN11 CN12 CN13 CN14

701710(4CH Model) :

CN15 CN16

B9989MB AD4 BOARD

CN5

CN1

ASSY

CN5

B9989MJ ACQ2

FAN

BOARD ASSY

701705(2CH Model) :

CN3 CN7

ASSY

CN CN1

UNIT

POWER

B9989YA

SUPPLY

BOARD ASSY

ASSY

701705(2CH Model) :

B9989MH AD2 BOARD

PS30

CN2 CN1

CN1 CN2

CN6

CN1

CN9

CN10

CN4

CN2

CN12 CN3

CN1

CN2

CN1

B9989ME

ADP BOARD ASSY

B9989MF

B9989MM

OPT TRIG

(Option: /F5)

BOARD ASSY

B9989YE

CN101

BUS BOARD ASSY

CN302 CN301

CN13

B9989YK

LCD

CN1

BOARD

ASSY

B9989YD

CN1

B9989MK

B9958LD

A1056VA

KEY BOARD

A1468UP

Inverter Unit

ASSY

B9989SB

SM 701710-01E

ASSY

ANALOG

B9989ML*

CH1

BOARD

CH2

ASSY

BOARD

ANALOG

B9989ML*

701710(4CH) :

NON

CH3/

ASSY

B9989MG

ET2 BOARD

701705(2CH) :

EXT.

CH4/

B9969SC

COMP

GND

B9989SD

* The assembly number differs depending on the date of manufacture as follows:

During or before December, 2001: B9989MA

After December, 2001 : B9989ML

Figure 6.1 Schematic Diagram of the DL1720/DL1740

6-1

Page 47

Chapter 7 Customer Maintenance Parts List

7.1 Customer Maintenance Parts List

Customer Maintenance Parts List

SM 701710-01E

Note:

Parts marked with a symbol are CMPL (Customer Maintenance Parts List) parts.

7-1

Page 48

7.1 Customer Maintenance Parts List

Complete Set

Item

1 2 3 4 5

6 7 8 9

Part No.

B9989EC B9989DA Y9408LB Y9408LB B9989EC

B9989EU B9989DT B9989DU B9946BQ B9858GB

Description

Qty

Support Top Cover

B.H. Screw, M4x8

Support

Sheet

Printer Cover

Handle

Sheet

Clamp

Printer Case111 B9989DR Frame112 B9989CJ Main Assembly113 -

Part No.Item Description

B9989ER14 1 B9989EY 1 B9989ES 1

B9989FM15 1

B9989FN 1

Note :

Qty

1B9989ET

1B9989FQ

1B9989FP

CMPL parts

Sheet (701710) Sheet (701705) Sheet (/P2) Sheet (/P4) Sheet

Sheet (/C7 /C10) Sheet (/C7) Sheet (/C10)

(select)

7-2

SM 701710-01E

Page 49

7.1 Customer Maintenance Parts List

23 24

Customer Maintenance Parts List

20 21

1098

19 18

33 32 31

29a

SM 701710-01E

7-3

Page 50

7.1 Customer Maintenance Parts List

Part No.Item

B9989DY

B9989DX B9989DK

B9989DL

B9989EL

B9969DK

B9989DM

B9989DD

B9989DF B9989DP

B9969DE

B9989SD111Switch and Cable Assembly (AD-Switch)

A1056VA121 LCD Y9205LB

B9989CA

A9135ZM

A1468UP

B9989ME

B9989YE

B9989MK

B9989DJ

B9989DH B9989DG 1 Knob (701705)

A1207UD

Y9205LB

A1092UN

B9989YF

B9989SA

Y9308LB

B9989GM

Qty

Description Knob1

Knob

Spring

Lens

Knob

Front Bezel (701710)

Front Bezel (701705) Front Bezel (701710 /F5)

Knob

Screw

Front Frame

Spacer

Power Supply

BUS Board Assembly

SUMI-Card, BUS-KBD

Key Board Assembly

Knob

Knob (701710)

Printer (/B5)

Screw (/B5)

FDD Memory System (-J1)

SUMI Card (-J1) (CPU-Floppy)

Fan Assembly

B.H. Screw, M3x8

Zip Kit Assembly (-J2)

(select)

B9989MH 1 AD2 Board Assembly (701705) B9989QA 1

B9989QA 1 Analog Assembly (701710)

29a

B9989QG 1 ET2 Assembly (701705)

B9989MD 1 ACQ4 Board Assembly (701710)

B9989MJ 1 ACQ2 Board Assembly (701705) 31 32 33

B9989MS

B9989MT 35

B9989MF 36

B9989YK

B9850EG

B9850EF

Note: CMPL parts

AD4 Board Assembly (701710)1B9989MB

Analog Assembly

Power Supply1B9989YA CPU Board Assembly1B9989MC SCSI Serial Assembly (/C7)

Ether Assembly (/C10)

ADP Board Assembly

Shield SUMI-Card

TIP

ROD

OPT Trig Board Assembly (701710 /F5)1B9989MM39

(select)

7-4

SM 701710-01E

Page 51

7.2 Standard Accessories

Customer Maintenance Parts List

Part No.

Item

A1006WD

A1054WD

A1024WD

B9850NX

B9918EZ IM701710-01E

IM701710-02E

B9989FA

9B9989EX 1 Stopper (x4) 10 A1352EF 1 Fuse (250V/4A) 11 700988 2 Probe

700988 2

12 B9989YZ 1

SM 701710-01E

Qty

1 1A1009WD2 1 1 11Roll Chart (/B5)

1 1

1IM701710-51E

1IM701710-71E

Description Power Supply Cord (UL/CSA Standard) *

Power Supply Cord (VDE Standard) Power Supply Cord (BS Standard) Power Supply Cord (AS Standard)

Soft Case DL1720/DL1740 Digital Oscilloscope User’s Manual DL1720/DL1740 Digital Oscilloscope Operation Guide DL1740 Digital Oscilloscope I2C Bus Analysis Function (Includes the SPI Bus Analysis Function) Regarding the DL1720/DL1740 Digital Oscilloscope Communications Interface User’s Manual CD-ROM

Front Cover

Probe (/E2)

CD for Manual for DL1720/DL1740

†

‡

(select)

Note:

701705/701710 - -D

701705/701710 - -F

†

701705/701710 - -Q

‡

701705/701710 - -R

§ A roll chart will be

supplied only when the instrument is equipped with a built-in printer 701705 /F5

CMPL parts

7-5

Page 52

Chapter 8 Procedures for Disassembly

WARNING

8.1 Removing the Top Cover

1. Remove the 2 screws from the rear panel.

2. Remove the 4 screws from the bottom of the instrument.

Procedures for Disassembly

SM 701710-01E

8-1

Page 53

8.1 Removing the Top Cover

3. The top cover fits into the back of the front bezel. Remove the top cover by slowly

pulling it away from the front bezel in the direction of the arrows as shown in the

figure below.

The DL with the top cover removed

8-2

SM 701710-01E

Page 54

8.2 Removing the Printer Case

1. Remove the top cover. See section 8.1, “Removing the Top Cover.”

2. Remove the printer cover by raising it in the direction of the arrow as shown below,

then forcing it back until it pops out.

3. Remove the screw from the printer case located toward the rear of the instrument.

8.2 Removing the Printer Case

4. Raise the handle, then slide the printer case away from the bezel by pulling it back

slightly in the direction of the arrow.

Procedures for Disassembly

SM 701710-01E

8-3

Page 55

8.2 Removing the Printer Case

5. Lift the printer case to remove it, allowing the handle to slide through the opening in

the case.

DL with the printer case removed

8-4

SM 701710-01E

Page 56

8.3 Removing the Front Bezel

Removing the Knobs

1. Remove the knobs by pulling them outward in the direction of arrows.

Note

When the TIME/DIV and V/DIV knobs are removed, the “rib“ holding the knob to its shaft

becomes worn down causing the knob to become loose. Therefore, you should replace the

removed knobs with new ones.

8.3 Removing the Front Bezel

DL with the knobs removed

Procedures for Disassembly

SM 701710-01E

8-5

Page 57

8.3 Removing the Front Bezel

Removing the Front Bezel

2. Remove the top cover. See section 8.1, “Removing the Top Cover.”

3. Remove the printer case. See section 8.2, “Removing the Printer Case.”

4. The front bezel is fastened to the frame by eight tabs. Identify the location of all

tabs, then pry each tab away from the metal frame one-by-one until the bezel

comes free of the frame.

5. Remove the bezel, taking care not to damage the BNC connectors.

DL with the front bezel removed

8-6

SM 701710-01E

Page 58

8.4 Removing the AD Board Assembly and the Analog Assembly

Removing the Bottom Brackets

1. Remove the top cover. See section 8.1, “Removing the Top Cover.”

2. Remove the front bezel. See section 8.3, “Removing the Front Bezel.”

3. Remove the screws from the left, right, and rear sides (3 screws total), then

remove the bottom brackets.

DL with the bottom brackets removed

Procedures for Disassembly

SM 701710-01E

8-7

Page 59

8.4 Removing the AD Board Assembly and the Analog Assembly

Removing the Fan Assembly

4. Holding the fan assembly cable by its connector (not the cable itself), disconnect

the fan assembly cable. Unhook the cable from the plastic restraining tab.

5. Remove the 2 screws as shown, then lift the fan assembly upwards and remove it.

Be careful not to pull out the wires as you do so.

DL fan assembly removal

8-8

Removing the ADP Board Assembly and SUMI-Card

6. Remove the screw from the ADP board assembly cover, then remove the cover.

7. Remove the remaing screw from the ADP board assembly.

8. The ADP board assembly is fastened to the AD board assembly and the ACQ

board assembly from the inside by a connector. Pull out the ADP board assembly.

9. Remove the 3 screws from the SUMI-Card bracket as shown in the figure below,

then remove the bracket.

ADP bord assembly cover

Bracket

SM 701710-01E

Page 60

8.4 Removing the AD Board Assembly and the Analog Assembly

10. Grasp the SUMI-card near the connector with both hands, then slowly pull it out.

Be careful not to bend the card as you do so.

DL with the ADP board assembly and the SUMI-card removed

Removing the AD Board Assembly and the Analog Assembly

11 Remove the 5 screws from the left side of the instrument as shown in the figure

below.

Procedures for Disassembly

SM 701710-01E

8-9

Page 61

8.4 Removing the AD Board Assembly and the Analog Assembly

12. Remove the 4 screws from the right side of the instrument as shown in the figure

below.

13. Turn the unit upside down.

14. Remove the cables from the left and right sides as shown in the figure below.

8-10

15. Remove the 2 screws from the front panel as shown.

SM 701710-01E

Page 62

8.4 Removing the AD Board Assembly and the Analog Assembly

16. The ACQ board assembly is fastened to the bus board assembly underneath by

several connectors. The AD board assembly and the analog assembly cannot be

removed until you disconnect these connectors. Pull the front side (the side with

the BNC connectors) of the AD board assembly upwards to disconnect it from the

bus board assembly.

17. Pull the AD board assembly out towards the rear of the instrument. The analog

assembly pulls out with it.

DL with the AD board and analog assemblies removed

Procedures for Disassembly

SM 701710-01E

8-11

Page 63

8.5 Removing the Power Supply

1. Perform the steps in sections 8.3 and 8.4.

2. Remove the 2 screws as shown.

3. Remove the 2 screws as shown.

8-12

4. Pull out the power supply in the direction of the arrow as shown below.

SM 701710-01E

Page 64

DL with the power supply removed.

8.5 Removing the Power Supply

Procedures for Disassembly

SM 701710-01E

8-13

Page 65

8.6 Removing the CPU Board Assembly, SCSI Board Assembly, and the Ether Assembly

1. Remove the SUMI-card connected to either the floppy drive or the ZIP drive.

Unhook the connector then remove the SUMI-Card. The SUMI-card is thin and

fragile, so take care not to bend it when removing it.

2. In the same manner, unhook the connector on the board side, then remove the

SUMI-Card.

Note

When reinstalling the SUMI-Card, be sure to insert the cable all the way into the connector,

then hook the sliders to fasten the card in place.

3. Remove the screw as shown in the figure below.

8-14

SM 701710-01E

Page 66

8.6 Removing the CPU Board Assembly, SCSI Board Assembly, and the Ether Assembly

4. Remove the screw as shown in the figure below.

5. Pull out the CPU board assembly.

The SCSI board assembly and Ether assembly are attached to the CPU board

assembly, so they come out all together.

DL with the CPU Board Assembly, SCSI Board Assembly, and Ether Assembly

removed

Procedures for Disassembly

SM 701710-01E

8-15

Page 67

8.7 Removing the Front Frame

1. Peform the steps in section 8.1 to 8.6.

2. Remove the 2 screws that fasten the front frame to the rear panel.

3. Remove the SUMI-Card on the right side of the frame.

4. Remove the 5 screws that fasten the front frame to the front panel. Remove the

front frame.

8-16

DL with the front frame removed

SM 701710-01E

YOKOGAWA DL1720, DL1740 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Important Notice to the User

Introduction

Safety Precautions

Overview of This Manual

Contents

Chapter 1 General Information

1.1 Introduction

1.2 Safety Considerations

Chapter 2 Performance Testing

2.1 Introduction

2.2 Test Environment

2.3 Equipment Required for the Performance Test

2.4 Self Diagnosis

2.5 Vertical Axis DC Voltage Accuracy Test

2.6 Frequency Response Test

2.7 Time-Base Accuracy Test

2.8 Trigger Sensitivity Test

2.9 Trigger Accuracy Test

Chapter 3 Adjustments

3.1 Introduction

3.2 Test Environment

3.3 Equipment Required

3.4 DC Gain Adjustment on the AD Board

3.5 Flatness Adjustment on the Analog Board

Chapter 4 Principles of Operation

4.1 Introduction

4.2 Function of Each Assembly

4.3 Function of Each ASIC

Chapter 5 Troubleshooting

5.1 Introduction

5.2 Flowchart

5.3 Power Supply Secondary Voltage

5.4 Self Test

5.4.1 Key Board Test

5.4.2 Memory Test

5.4.3 FDD Test

5.4.4 Zip Test

5.4.5 SCSI Test

5.4.6 Printer Test

5.4.7 Accuracy Test

Chapter 6 Schematic Diagram

Chapter 7 Customer Maintenance Parts List

7.1 Customer Maintenance Parts List

7.2 Standard Accessories

Chapter 8 Procedures for Disassembly

8.1 Removing the Top Cover

8.2 Removing the Printer Case

8.3 Removing the Front Bezel

8.4 Removing the AD Board Assembly and the Analog Assembly

8.5 Removing the Power Supply

8.6 Removing the CPU Board Assembly, SCSI Board Assembly, and the Ether Assembly

8.7 Removing the Front Frame