YOKOGAWA DL1740EL, DL1720E, DL1740E Service manual

Service
Manual

DL1720E/DL1740E/DL1740EL
Digital Oscilloscope

Yokogawa Electric Corporation

SM 701730-01E
2nd Edition

Important Notice to the User

This manual contains information for servicing YOKOGAWA’s DL1720E/DL1740E/
DL1740EL Digital Oscilloscope. Check the serial number to confirm that this is the
correct service manual for the instrument to be serviced.
Before any maintenance and servicing, read all safety precautions carefully.

properly trained personnel

service manual.
permitted by this service manual.
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 not 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, or functionality, reliability, or for 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.
All rights reserved. No part of this service manual may be reproduced in any form or by
any means without the express written prior permission of YOKOGAWA. The contents
of this manual are subject to change without notice.

and

may carry out the maintenance and servicing described in this

Do not disassemble the instrument or its parts,

Do not replace any part or assembly,

assemblies

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

Do not use the wrong manual.

Only

unless otherwise clearly

unless otherwise

Trademark

Revisions

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:

• Repair of components can only be performed by specially trained and qualified
maintenance personnel with special tools. In addition, repair of components requires
various special parts and components, including costly ones. It also requires facilities
where highly-accurate and expensive maintenance equipment and special tools are
provided.

• 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.

• Adobe and Acrobat are trademarks of Adobe Systems Incorporated.

• For purposes of this manual, the TM and  symbols do not accompany their
respective trademark names or registered trademark names.

• Other company and product names are trademarks or registered trademarks of their
respective companies.

1st Edition: October 2004
2nd Edition: June 2005

2nd Edition: June 2005 (YK)
All Rights Reserved, Copyright © 2004 Yokogawa Electric Corporation

SM 701730-01E

i

Safety Precautions

The following general safety precautions must be observed 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.

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 service. Even if servicing is
carried out by qualified personnel according to this service manual, YOKOGAWA
assumes no responsibility for any result occurring from this servicing.

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 cord supplied by
YOKOGAWA. The main power plug must be plugged into an outlet with a
protective grounding terminal. Do not disable protection by using an extension
cord without protective grounding.

WARNING

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.

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.

ii

SM 701730-01E

Safety Symbols Used on Equipment and in Manuals

Improper handling or use can lead to injury to the user or
damage to the instrument. This symbol appears on the
instrument to indicate that the user must refer to the user’s
manual for special instructions. The same symbol appears
in the corresponding place in the user’s manual to identify
those instructions. In the manual, the symbol is used in
conjunction with the word “WARNING” or “CAUTION.”

This symbol represents a functional grounding terminal.
Such terminals should not be used as protective grounding
terminals.

Safety Precautions

WARNING

CAUTION

Note

Describes precautions that should be observed to prevent
serious injury or death to the user.

Describes precautions that should be observed to prevent
minor or moderate injury, or damage to the instrument.

Provides important information for the proper operation of
the instrument.

SM 701730-01E

iii

Overview of This Manual

This manual is meant to be used by qualified personel only. Make sure to read the
safety precautions at the beginning of this manual and the warnings/cautions contained
in any referenced chapter prior to carrying out any servicing.
This manual contains the following chapters:

1 Principles of Operations

Describes the functions of various assemblies and lists safety considerations.

2 Performance Testing

Describes the tests for checking performance of the instrument.

3 Adjustments

Describes the adjustments which can be performed by users.

4 Troubleshooting

Describes procedures for troubleshooting and what to do in case parts need to be
replaced.

5 Schematic Diagram

A diagram of the system configuration.

6 Customer Maintenance Parts List

Contains exploded views and a list of replaceable parts.

7 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 701730-01E.

iv

SM 701730-01E

Contents

1

Safety Precautions .................................................................................................................. ii

Overview of This Manual ........................................................................................................iv

Chapter 1 Principles of Operation

1.1 Block Diagram .......................................................................................................... 1-1

1.2 Function of Each Assembly...................................................................................... 1-2

1.3 Function of Each ASIC ............................................................................................. 1-6

Chapter 2 Performance Testing

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

2.2 Tests for the DL1720E/DL1740E/DL1740EL ........................................................... 2-2

2.2.1 Grounding Test ............................................................................................. 2-3

2.2.2 Insulation Resistance Test ............................................................................ 2-4

2.2.3 Withstand Voltage ......................................................................................... 2-4

2.2.4 Selftest .......................................................................................................... 2-4

2.2.5 GP-IB Test .................................................................................................... 2-5

2.2.6 Rear Panel Probe Power Supply Test .......................................................... 2-6

2.2.7 LINE Trigger, Trigger LED, and Hold Off Test ............................................... 2-6

2.2.8 Probe Compensation Output and Auto Setup Test ....................................... 2-6

2.2.9 Timebase Accuracy Test ............................................................................... 2-7

2.2.10 Input Signal Bandwidth ................................................................................. 2-7

2.2.11 Trigger Sensitivity Test.................................................................................. 2-8

2.2.12 Offset Accuracy............................................................................................. 2-8

2.2.13 DC Accuracy ................................................................................................. 2-9

2.2.14 EXT Trigger Level Accuracy Test ................................................................ 2-10

2.2.15 EXT Trigger Sensitivity and Trigger Out Test .............................................. 2-11

2.2.16 EXT Clock Input Test .................................................................................. 2-12

2

3

4

5

6

7

Chapter 3 Adjustments

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

3.2 Test Environment ..................................................................................................... 3-2

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

3.4 DC Offset Adjustment on the AD Board ................................................................... 3-4

3.5 Flatness Adjustment on the Analog Board ............................................................... 3-7

Chapter 4 Troubleshooting

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

4.2 Flow Chart ................................................................................................................ 4-2

4.3 Assemblies to Check When an Error Occurs ........................................................... 4-3

4.4 Power Supply Secondary Voltage............................................................................ 4-6

Chapter 5 Schematic Diagram

5.1 Schematic Diagram .................................................................................................. 5-1

Chapter 6 Customer Maintenance Parts List

6.1 Customer Maintenance Parts List ............................................................................ 6-1

6.2 Standard Accessories .............................................................................................. 6-5

SM 701730-01E

v

Contents

Chapter 7 Procedures for Disassembly

7.1 Flow Chart of Disassembly ...................................................................................... 7-1

7.2 Removing the Top Cover.......................................................................................... 7-2

7.3 Removing the Fan Assy ........................................................................................... 7-3

7.4 Removing the Printer Case ...................................................................................... 7-4

7.5 Removing the CPU Board Assy ............................................................................... 7-5

7.6 Removing the Printer Unit ........................................................................................ 7-6

7.7 Removing the Inverter Assy ..................................................................................... 7-9

7.8 Removing the Front Bezel ..................................................................................... 7-10

7.9 Removing the PC Card Drive/FDD Assy................................................................ 7-11

7.10 Removing the Key Board Assy .............................................................................. 7-12

7.11 Removing the LCD ................................................................................................. 7-13

7.12 Removing the Power Supply Assy ......................................................................... 7-14

7.13 Removing the Input Assy ....................................................................................... 7-16

7.14 Removing the AD Board Assy ................................................................................ 7-19

7.15 Removing the Analog Assy/ET2 Assy .................................................................... 7-21

7.16 Removing the ACQ Board Assy ............................................................................. 7-22

7.17 Removing the Ether Board Assy ............................................................................ 7-23

vi

SM 701730-01E

Chapter 1 Principles of Operation

1.1 Block Diagram

Block Diagram of the DL1720E/DL1740E/DL1740EL

Primary
memory

ATT

CH1

CH2

CH3*

CH4*

External clock input

External trigger input

Trigger gate input

Pre-

Multiplexer

AMP

Trigger

circuit

Signal Flow

The signal applied to each signal input terminal is first passed to the vertical control
circuit consisting of an attenuator (ATT) and pre-amplifier. At the attenuator and pre­amplifier, the voltage and amplitude of each input signal is adjusted according to the
settings such as the input coupling, probe attenuation/current-to-voltage conversion ratio,
V/div, and offset voltage. The adjusted input signal is then passed to the multiplexer.
The signal input to the multiplexer is passed to the A/D converter according to the time
axis and other settings.

A/D

Time base

Primary

data

processing

circuit

Acquisition

memory

Secondary

data

processing

circuit

Display

processing

circuit

Display

memory

Data

processing

memory

CPU

VGA video

output

Color LCD

display

Built-in

printer

USB

Peripheral

Keyboard

GP-IB

USB

FDD or
PC card

Ethernet

GO/NO-GO

Trigger output

1

Principles of Operation

(Optional)

(Optional)

At the A/D converter, the received voltage level is converted into digital values. The
digital data is written to the primary memory by the primary data processing circuit at the
sample rate that matches the time axis setting. The data written to the primary memory
is processed (averaged, for example) by the secondary data processing circuit and
written to the acquisition memory.
The data written to the acquisition memory is converted into waveform display data by
the secondary data processing circuit, transferred to the waveform processing circuit,
and stored to the display memory. The waveforms are displayed on the LCD using the
data stored to the display memory.

The block diagrams of the DL1720E are shown in figure 1.1 and figure 1.2. The block
diagrams of the DL1740E/DL1740EL are shown in figure 1.3 and figure 1.4. Figure 1.1
and figure 1.3 are block diagrams of the circuit from the analog input to the A/D
conversion circuit and trigger circuit including the attenuator, one-chip amplifier, analog
multiplexer, time base circuit, A/D converter, trigger comparator, and trigger circuit.
Figure 1.2 and figure 1.4 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.

SM 701730-01E

1-1

1.2 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.

As indicated in figure 1.1 or figure 1.3, 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 DL1720E) assembly.

Table 1.1 Setting Range and Amplifying Level

Setting Range Attenuator Division Ratio Amplifying Rate

2 mV/div 1/1 × 25
5 mV/div 1/1 × 10
10 mV/div 1/1 × 5
20 mV/div 1/1 × 2.5
50 mV/div 1/1 × 1
100 mV/div 1/10 × 5
200 mV/div 1/10 × 2.5
500 mV/div 1/10 × 1
1 V/div 1/100 × 5
2 V/div 1/100 × 2.5
5 V/div 1/100 × 1
10 V/div 1/200 × 1

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

1-2

SM 701730-01E

1.2 Function of Each Assembly

AD4 Board (or AD2 Board for the DL1720E) Assembly

The AD4 board (or AD2 board for the DL1720E) 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
DL1720E/DL1740E/DL1740EL, 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 DL1720E 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
DL1720E) assembly.

1

Principles of Operation

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 TRIG IN, and TRIG GATE IN functions, as well as an active probe power supply (/
P4 or /P2 for the DL1720E) circuit.

ACQ4 Board (or ACQ2 Board for the DL1720E) Assembly

The ACQ4 board (or the ACQ2 board for the DL1720E) 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 DL1720E) 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 DL1720E uses 2 Mbit
PBSRAM for the ring buffer memory, the DL1740E uses 4 Mbit PBSRAM, and the
DL1740EL uses 16 Mbit PBSRAM.

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) on the CPU board assembly
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.

SM 701730-01E

1-3

1.2 Function of Each Assembly

CPU Board Assembly

The CPU board consists of each circuit block’s control circuit, an I/O circuit, other
peripheral circuits, and a display section (for displaying waveforms and other
information).

A Hitachi HD6417750SF 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, GP-IB
controller, USB I/F circuit, and PC card. On the CPU bus, they are the Ethernet I/F
(option: /C10) circuit.

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.

Key Board Assembly

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

Mother Board Assembly

Controls the exchange of signals between the CPU, KEY, ACQ4 (or the ACQ2 for the
DL1720E), and a printer assembly. Supplies output from the power supply unit to the
CPU, KEY, ACQ4 board (or the ACQ2 board for the DL1720E) assemblies, AD4 board
(or the AD2 board for the DL1720E) assemblies, and a printer assembly. +12 V
generation takes place on this board.

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 × 480
Waveform display resolution: 500 × 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 (1.44 MB formats).

PCMCIA Board Assembly (-J3)

The PCMCIA board assembly connects a Type II PC card with the CPU board.

1-4

SM 701730-01E

1.2 Function of Each Assembly

Ether Board Assembly (Optional)

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

The OPT TRIG board assembly is equipped with a serial bus trigger logic (STL). The
STL can generate two types of trigger signals: I2C bus triggers and SPI bus triggers.

1

Principles of Operation

SM 701730-01E

1-5

1.3 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 front­end 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, a trigger hold-off function, and control of the time-to­voltage 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).

Acquisition Memory Interface (AMI)

The AMI is a CMOS gate array. Its functions include interfacing to the ring buffer
memory controller (RBC), interfacing to the graphic control processor (GCP), averaging,
history control, waveform computation, and auxiliary functions for the automated
measurement of waveform parameters.

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
(HD6417750SF) and the peripheral ICs, keyboard control, LED control, interrupt control,
and DMA selection.

Serial Bus Trigger Logic (STL)

The STL is a field programmable gate array. The STL can generate two types of serial
bus triggers: I2C bus triggers and SPI bus triggers.

1-6

SM 701730-01E

1.3 Function of Each ASIC

1

Principles of Operation

CH1/CH2

* To ACQ2 Board

Assembly

Clock

A/D

Converter

A/D

Converter

Time

Base

Clock

Control

Signal

AFC

PROBE

POWER × 2 (/P2)

PWD

TRIG OUT

FTL

AD2 Board Assembly

TV Trigger

Line Trigger

Offset

Trigger Level

Multiplexer

From Power

Unit *

TVC

Comparator

One Chip Amplifier

ATT

Analog Board Assembly

MES)

(GND/

Coupling

50 Ω)

(1 MΩ/

Coupling

(AC/DC)

Coupling

CH1

Figure 1.1 Block Diagram (Analog Section) of the DL1720E

CH2

HFrej

DC/AC/

Filter

(20 MHz,

100 MHz)

Gain

1/1,1/10,

1/100,1/200

MES

GND/

50 Ω

1 MΩ/

AC/DC

Comparator

EXT.

ET2 Board Assembly

1/1

1/10

SM 701730-01E

1-7

1.3 Function of Each ASIC

Ether Board Assembly

Ethernet (/C10)

USB

USB IF

ETHERNET IF

CPU

GO/NO-GO

CPU Board Assembly

USB

PERIPHERAL

GPIB

GPIB IF

Main Memory

FD Drive (-J1)

FDD Controller

Flash ROM

PC Card (-J3)

PC CARD IF

Backup RAM

LCD

Video OUT

GCP

PIO

Printer (/B5)

Memory

Character

Graphic

Memory

CIO

Key Board

Assembly

AC

Power

Unit

DC

Line Trigger

To AD2 Board Assembly *

Mother Board Assembly

1-8

Work

Memory

AMI

ACQ

Memory

ACQ2 Board Assembly

RBC

Ring

Buffer

Memory

Clock

Control

CH1/CH2

From AD2 Board

Assembly *

Signal

Figure 1.2 Block Diagram (Digital Section) of the DL1720E

SM 701730-01E

1.3 Function of Each ASIC

1

Principles of Operation

CH1/CH2

* To ACQ4 Board

Assembly

CH3/CH4

* To ACQ4 Board

Assembly

Control Signal

PROBE

POWER × 4 (/P4)

TRIG OUT

EXT CLOCK IN

EXT TRIG IN

TRIG GATE IN

PWD

A/D

Converter

Clock

A/D

Converter

A/D

Converter

Clock

A/D

Converter

Time Base

Clock

AFC

FTL

STL

AD4 Board Assembly

OPT TRIG Board Assembly

TVC

Line Trigger

From Power

Unit *

TV Trigger

Comparator

Offset

Trigger Level

Multiplexer

SM 701730-01E

One Chip Amplifier

Analog Board Assembly

ATT

MES)

(GND/

Coupling

50 Ω)

(1 MΩ/

Coupling

(AC/DC)

Coupling

CH1

HFrej

DC/AC/

Filter

(20 MHz,

100 MHz)

Gain

1/1, 1/10,

1/100, 1/200

MES

GND/

0 Ω
5

1 MΩ/

AC/DC

CH2

CH3

CH4

Figure 1.3 Block Diagram (Analog Section) of the DL1740E/DL1740EL

1-9

1.3 Function of Each ASIC

Ether Board Assembly

Ethernet (/C10)

USB

USB IF

ETHERNET IF

CPU

GO/NO-GO

CPU Board Assembly

USB

PERIPHERAL

GPIB

GPIB IF

Main Memory

FD Drive (-J1)

FDD Controller

Flash ROM

PC Card (-J3)

PC CARD IF

Backup RAM

LCD

Video OUT

GCP

PIO

Printer (/B5)

Memory

Character

Graphic

Memory

CIO

Key Board

Assembly

AC

Power

Unit

DC

Line Trigger

To AD4 Board Assembly *

Mother Board Assembly

1-10

Work

Memory

ACQ

Memory

AMI

Work

Memory

AMI

ACQ

Memory

ACQ4 Board Assembly

RBC

Clock

CH1/CH2

From AD4 Board

Assembly *

Ring

Buffer

Memory

RBC

Clock

CH3/CH4

From AD4 Board

Assembly *

Ring

Buffer

Memory

Control

Signal

Figure 1.4 Block Diagram (Digital Section) of the DL1740E/DL1740EL

SM 701730-01E

Chapter 2 Performance Testing

2.1 Introduction

Test Environment

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.

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 thirty minutes after turning ON the instrument.

• Confirm that self calibration is correctly executed after the thirty-minute warm up.
(Be sure to pay attention to the warm up time of all equipment that will be used in the
test.)

2

Performance Testing

SM 701730-01E

2-1

2.2 Tests for the DL1720E/DL1740E/DL1740EL

Tests

2.2.1 Grounding Test

2.2.2 Insulation Resistance Test

2.2.3 Withstand Voltage

2.2.4 Selftest
Memory Test
Keyboard Test
Printer Test (Only When the /B5 Option Is Installed)
Floppy Disk Test (Only When the -J1 Option Is Installed)
PC Card IF Test (Only When the -J3 Option Is Installed)
Self-Calibration Test

2.2.5 GP-IB Test

2.2.6 Rear Panel Probe Power Supply Test

2.2.7 LINE Trigger, Trigger LED, and Hold Off Test

2.2.8 Probe Compensation Output and Auto Setup Test

2.2.9 Timebase Accuracy Test

2.2.10 Input Signal Bandwidth

2.2.11 Trigger Sensitivity Test

2.2.12 Offset Accuracy

2.2.13 DC Accuracy

2.2.14 Ext Trigger Level Accuracy Test

2.2.15 EXT Trigger Sensitivity and Trigger Out Test

2.2.16 Ext Clock Input Test

2-2

SM 701730-01E

Instruments Used

Before Testing

2.2 Tests for the DL1720E/DL1740E/DL1740EL

Model Name Recommended Device

AC low resistance tester Kikusui TOS6100
Insulation tester YOKOGAWA 2407
Withstanding voltage tester Kikusui TOS-8750
Calibrator FLUKE (WAVETEK) 9500
Programmable head FLUKE (WAVETEK) 9520, 5 pc.
BNC cable
50 Ω terminator
Accessory probe 700988
FET probe YOKOGAWA 700939
Printer paper B9850NX

3.5" floppy disk Formatted 2 HD 1.4 M disk
Flash ATA card JT**MA3-BD: Fujisoku
PC
Equivalent instruments may be used

• Unless specified within, use the default settings on the main unit during testing.

• The DL1740E and DL1740EL accept 4-channel input, so testing should be performed
on channels 1 through 4. However, the DL1720E has 2-channel input, so testing
should be performed on channels 1 and 2.

• Before testing, restart the unit while holding down the Reset key to initialize the
instrument.

• During testing, also hold down the Reset key when restarting.

2

Performance Testing

2.2.1 Grounding Test

Product specification: 0.1 Ω or less

Confirm that a current of 30 A flows between the FG inlet of the AC power supply input
and channel 4 of the BNC ground (or between FG and EXT. for the DL1720E), and that
the resistance value is 0.1 Ω or less.

DL1720E/DL1740E/

DL1740EL

CH4

FG

V­I­V+
I+

AC Low Resistance Tester

SM 701730-01E

2-3

2.2 Tests for the DL1720E/DL1740E/DL1740EL

2.2.2 Insulation Resistance Test

Specifications: For DC 500 V, 10 MΩ or higher

Testing Procedure

Measure the insulation resistance between the AC power supply input signals below
when the power switch is turned ON.

DL1720E/DL1740E/

DL1740EL

L
N

When the Ethernet (/C10) option is installed, also measure the insulation resistance
across the following signals. (Note: the ETHERNET input terminal should be shorted
across all terminals.)

Power Cable

G

L
N

FG

Insulation Tester

DL1720E/DL1740E/

2.2.3 Withstand Voltage

Testing Procedure

Measure the withstand voltage between the AC power supply input signals below when
the power switch is turned ON.

DL1720E/DL1740E/

Items to Be Checked

That the product specification is met.
Specification: AC 1.5 kV for 1 minute

2.2.4 Selftest

The selftest is performed in the STOP condition.
Test the following items.

DL1740EL

DL1740EL

L
N

G

Ethernet Cable

(Terminal is shorted)

FG

Power Cable

L
N

FG

Insulation Tester

Withstanding
Voltage Tester

Testing Procedure

2-4

1. Perform the following test items while referring to “Performing a Self-Test” in the
DL1720E/DL1740E/DL1740EL user’s manual (IM701730-01E).

• Memory Test

• Keyboard Test

• Printer Test (only when the /B5 option is installed)

• Floppy Disk Test (only when the -J1 option is installed)

• PC Card IF Test (only when the -J3 option is installed)

2. Confirm that all tests were completed normally and that no errors occurred.

3. Perform the self-calibration, referring to “Performing Calibration” in the
DL1720E/DL1740E/DL1740EL user’s manual (IM 701730-01E).

4. Confirm that “CAL” in the upper left part of the screen disappears, and that
calibration completed without errors.

SM 701730-01E

2.2.5 GP-IB Test

Test Items

Testing Procedure

2.2 Tests for the DL1720E/DL1740E/DL1740EL

• APC with support for GP-IB

• GP-IB cable

1. Connect the PC to the main unit with the GP-IB cable.

2. Press MISC. The MISC menu appears.

3. Press the Remote Control soft key. The Remote Cntl menu appears.

4. Press the Device soft key. The Device menu appears.

5. Press the GP-IB soft key.

6. Turn the jog shuttle to set the GP-IP address.

7. Select Format, Rx-Tx, or Terminator as required.

8. Execute a program like the one below.
The following program was written in Visual Basic. Your program may differ
depending on the language used.

Private Sub Command2_Click() 'GPIB-TEST

========== Initialize GP-IB =============

Call ibfind("DEV1", dl%)
Call ibsic(dl%)

2

Performance Testing

vol$ = 0
vol$ = Space$(10)

========= Send command =========

Call ibwrt(dl%, "COMM:HEAD OFF" + vbCrLf)
DoEvents
Call ibwrt(dl%, "ACQ:MODE NORM" + vbCrLf)
DoEvents
Call ibwrt(dl%, "ACQ:MODE?" + vbCrLf)
DoEvents

=========== Receive data ==============

Call ibrd(dl%, vol$)
DoEvents

=========== Display data ==============

Text1.Text = Mid(vol$, 1, 4)

End Sub

Items to Be Checked

That "NORM" is displayed on the PC screen.

Display Screen Example

SM 701730-01E

2-5

2.2 Tests for the DL1720E/DL1740E/DL1740EL

2.2.6 Rear Panel Probe Power Supply Test

Testing Procedure

Connect the FET probe (700939) to the main unit, and confirm that the probe
compensation signal appears correctly.

2.2.7 LINE Trigger, Trigger LED, and Hold Off Test

Testing Procedure

1. Initialize the unit. See section 4.4, “Initializing Settings” in the DL1720E/
DL1740E/DL1740EL user’s manual (IM 701730-01E) for the operating
procedure.

2. Enter the following settings.
SIMPLE (Trigger) Source: Line

Hold off: 1 s

Items to Be Checked

That the trigger LED blinks at 1 second intervals.

2.2.8 Probe Compensation Output and Auto Setup Test

Testing Procedure

1. Connect the accessory probe (10:1) to the Probe Compensation terminal and
input to an arbitrary channel.

2. Execute Auto Setup. See section 4.5, “Executing Auto Setup” in the DL1720E/
DL1740E/DL1740EL user’s manual (IM 701730-01E) for the operating
procedure.

Items to Be Checked

Confirm that a square wave of approximately 1 V

Probe Compensation Test Waveform

and 1 kHz appears on screen.

P-P

2-6

SM 701730-01E

2.2.9 Timebase Accuracy Test

Testing Procedure

1. Enter the following settings on the DL1720E/DL1740E/DL1740EL.
CH1 Display: ON

Other than CH1 Display: OFF
DISPLAY Format: Single
ACQ Record Length: 10 k
TIME/DIV 2 µs/div
MEASURE Mode: ON

2.2 Tests for the DL1720E/DL1740E/DL1740EL

V/div: 50 mV/div
Coupling: DC 50 Ω

Item Setup (CH1): Freq

2

Performance Testing

2. Input a 500.2 MHz, 300 mV

3. Confirm that the CH1 Freq becomes 200 ±25 kHz.

4. Enter the setting below, then input a 200.1 MHz, 300 mV
TIME/DIV: 5 µs/div

5. Confirm that the CH1 Freq becomes 100 ±10 kHz.

Items to Be Checked

That the product specification is met.
Specification: ±0.005%

2.2.10 Input Signal Bandwidth

Specification: DC–500 MHz (–3dB) DC 50 Ω (excluding the 2 mV/div and 5 mV/div)

Testing Procedure

1. Execute calibration (see section 4.6, “Performing Calibration” in the DL1720E/
DL1740E/DL1740EL user’s manual (IM 701730-01E)).

2. Enter the following settings on the DL1720E/DL1740E/DL1740EL.
CH (all channels) Display: ON

DISPLAY Format: Single
ACQ Record Length: 1 k

TIME/DIV 2 ns/div
SIMPLE (Trigger) Source: Input channel
MEASURE Mode: ON

sinewave from the calibrator to CH1.

P-P

sinewave.

P-P

DC–400 MHz (–3dB) DC 50 Ω (2 mV/div and 5 mV/div)
DC–400 MHz (–3dB) 1 MΩ (probe terminal)

Coupling: DC 50 Ω

Mode: Average
Weight: 4

Item Setup (all channels): Sdev
T-Range1: –5.00 div
T-Range2: 5.00 div

SM 701730-01E

3. Input a sinewave from the calibrator to the channel under test.

4. Using the table below, measure Sdev on the input waveform, and confirm that it
lies within the judgment criteria.

V/div Input Amplitude (

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

) Input Frequency Judgement Criteria

P-P

2-7

2.2 Tests for the DL1720E/DL1740E/DL1740EL

2.2.11 Trigger Sensitivity Test

Specification: Sensitivity 1 div (display screen) at 500 MHz

Testing Procedure

Turn the display of each channel ON one at a time (with all other channels OFF), then
confirm the following:

1. Enter the following settings on the DL1720E/DL1740E/DL1740EL.
CH (all channels) V/div: 0.5 V/div,

TIME/DIV 1 ns/div
DISPLAY Format: Single
ACQ Record Length: 1 k

SIMPLE (Trigger) Source: Input channel

2. Input a 500 MHz sinewave from the calibrator to the channel under test so that
the amplitude on the display screen is 500 mV

Items to Be Checked

Confirm that the triggers activate normally on all channels.

Probe: 1:1
Coupling: DC 50 Ω

Mode: Average
Weight: 4

.

P-P

Trigger Sensitivity Test Waveform

2.2.12 Offset Accuracy

Specification: 2 mV/div–50 mV/div: ± (1% of the setting + 0.2 mV)

Testing Procedure

1. Execute calibration (see section 4.6, “Performing Calibration” in the DL1720E/

2. Enter the following settings on the DL1720E/DL1740E/DL1740EL.

100 mV/div–500 mV/div: ± (1% of the setting + 2 mV)
1 V/div–10 V/div: ± (1% of the setting + 20 mV)

DL1740E/DL1740EL user’s manual (IM 701730-01E)).

CH (all channels) V/div: 5 mV/div

Probe: 1:1
ACQ Mode: Box Average
TIME/DIV 5 ms/div
DISPLAY Format: Single
MEASURE Mode: ON

Item Setup: Avg

(channel under test)

2-8

SM 701730-01E

2.2.13 DC Accuracy

Testing Procedure

2.2 Tests for the DL1720E/DL1740E/DL1740EL

3. Input a ±DC voltage from the calibrator to the channel under test.

4. Apply a ±1 V offset to the channel under test, then confirm that the values
obtained from automated measurement of waveform parameters (see section

10.6, “Automated Measurement of Waveform Parameters” in the DL1720E/
DL1740E/DL1740EL user’s manual (IM 701730-01E) lie within the judgment
criteria on all channels.

Input Voltage Offset Judgment Criteria

1 V 1 V 0.9898 to 1.0102 V
–1 V –1 V –1.0102 to –0.9898 V

Specification: ±(1.5% of 8 div + offset accuracy)

1. Execute calibration (see section 4.6, “Performing Calibration” in the user’s
manual (IM 701730-01E)).

2. Enter the following settings on the DL1720E/DL1740E/DL1740EL.
CH (all channels) Coupling: DC 1 MΩ
DISPLAY Format: Single
ACQ Mode: Box Average
TIME/DIV 1 ms/div
MEASURE Mode: ON

Item Setup: Avg
(channel under test)

2

Performance Testing

3. Input DC voltage from the DC voltage generator to the channel under test.

4. Using the table below, confirm that the measured values lie within the judgment
criteria on all channels.

Range Input Measured Value Input Measured Value Input Measured Value

Voltage Voltage Voltage

10 V 40 V 38.78 to 41.22 V 0 V –1.22 to 1.22 V –40 V –41.22 to –38.78 V
5 V 20 V 19.38 to 20.62 V 0 V –0.62 to 0.62 V –20 V –20.62 to –19.38 V
2 V 8.0 V 7.74 to 8.26 V 0 V –0.26 to 0.26 V –8.0 V –8.26 to –7.74 V
1 V 4.0 V 3.86 to 4.14 V 0 V –0.14 to 0.14 V –4.0 V –4.14 to –3.86 V

0.5 V 2.0 V 1.938 to 2.062 V 0 V –62 to 62 mV –2.0 V –2.062 to –1.938 V

0.2 V 800 mV 774 to 826 mV 0 V –26 to 26 mV –800 mV –826 to –774 mV

0.1 V 400 mV 386 to 414 mV 0 V –14 to 14 mV –400 mV –414 to –386 mV
50 mV 200 mV 193.8 to 206.2 mV 0 V –6.2 to 6.2 mV –200 mV –206.2 to –193.8 mV
20 mV 80 mV 77.4 to 82.6 mV 0 V –2.6 to 2.6 mV –80 mV –82.6 to –77.4 mV
10 mV 40 mV 38.6 to 41.4 mV 0 V –1.4 to 1.4 mV –40 mV –41.4 to –38.6 mV
5 mV 20 mV 19.2 to 20.8 mV 0 V –0.8 to 0.8 mV –20 mV –20.8 to –19.2 mV
2 mV 8.0 mV 7.56 to 8.44 mV 0 V –0.44 to 0.44 mV –8.0 mV –8.44 to –7.56 mV

SM 701730-01E

2-9

2.2 Tests for the DL1720E/DL1740E/DL1740EL

2.2.14 EXT Trigger Level Accuracy Test

Specification: ± (10% of setting + 50 mV)

Testing Procedure

1. Enter the following settings on the DL1720E/DL1740E/DL1740EL.
CH1 Display: ON

Other than CH1 Display: OFF
DISPLAY Format: Single
ACQ Record Length: 10 k

TIME/DIV 200 µs/div
SIMPLE (Trigger) Source: Ext

CURSOR Type: Marker

V/div: 0.2 V/div
Probe: 1:1

Mode: Box Average

Range: ±1 V (for the DL1720E)
Probe: 1:1

Cursor1: 0.00 div

2. Input a sinewave of 1.6 V

, 0 V offset, and 1 kHz from the calibrator to CH1

P-P

and the EXT trigger input terminal on the rear panel. Pass the input to the EXT
trigger input terminal on the rear panel through a 50 Ω terminator.

3. Confirm that the value V

read by the cursor when the polarity is ↑, and the

h

value Vl when it is ↓ lie within the judgment criteria below.

Trigger Level Judgment Criteria

700 mV 580 mV ≤ (Vh + Vl)/ 2 ≤ 820 mV
0 mV –50 mV ≤ (Vh + Vl)/ 2 ≤ 50 mV
–700 mV –820 mV ≤ (Vh + Vl)/ 2 ≤ –580 mV

4. Since you must cancel the trigger level offset for the trigger sensitivity test, use
the V

and VI values measured when the trigger level was set to 0 mV under this

h

item, set

V

= –( Vh + Vl ) / 2,

c

then use this trigger level for the next EXT trigger sensitivity and trigger out test.

2-10

SM 701730-01E

2.2 Tests for the DL1720E/DL1740E/DL1740EL

2.2.15 EXT Trigger Sensitivity and Trigger Out Test

Specification: Sensitivity 100 mV at 100 MHz

Testing Procedure

1. Enter the following settings on the DL1720E/DL1740E/DL1740EL.
CH1 Display: ON

V/div: 20 mV/div
Probe: 1:1
Coupling: DC 50 Ω

CH2 Display: ON

V/div: 2 V/div
Probe: 1:1

Coupling: DC 1 MΩ
Other than CH1 or CH2 Display: OFF
DISPLAY Format: Dual
ACQ Record Length: 10 k

Mode: Normal
TIME/DIV 10 ns/div
SIMPLE (Trigger) Source: Ext

Range: ±1 V (for the DL1720E)

Probe: 1:1

Level: V

Position: 10%

(see prev item)

c

2

Performance Testing

2. Input a 100 MHz, 100 mV

3. Connect the rear panel trigger output to CH2 through a BNC cable.

Items to Be Checked

Confirm that the trigger activates normally, and that a stable waveform is displayed.

Observation Example

sinewave from the calibrator to CH1 and the EXT

P-P

trigger input terminal. Pass the input to the EXT trigger input terminal through
the 50 Ω terminator.

SM 701730-01E

2-11

2.2 Tests for the DL1720E/DL1740E/DL1740EL

2.2.16 EXT Clock Input Test

1. Enter the following settings two channels at a time.
Display: ON (other channels OFF)

2. Enter the following settings on all channels, then perform steps 3, 4, and 5.
CH (all channels) V/div: 50 mV/div

DISPLAY Format: Dual
ACQ Record Length: 10 k

ENHANCED (Trigger) Type: OR

3. Input a 20 MHz sinewave to the EXT clock input terminal on the rear panel
through a 50 Ω terminator.

4. Input a 300 mV
under test.

5. Confirm that no noticeable degradation occurs from bit loss and that the
waveform in the figure below is displayed correctly.

Probe: 1:1
Coupling: DC 1 MΩ

Mode: Normal
Time Base: Ext

Set Pattern (all channels): ↑
Level (all channels): 0 mV

, 4 kHz sinewave from the function generator to the channels

P-P

Waveform Observation Example

2-12

SM 701730-01E

Chapter 3 Adjustments

3.1 Introduction

The top cover, printer cover, printer case, front bezel, and shield cover must be removed
before adjusting the DL1720E/DL1740E/DL1740EL. Read the warning and cautions
below before doing so.

WARNING

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.

CAUTION

• 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 DL1720E/DL1740E/DL1740EL upside
down for adjustment. Do not drop the instrument, or allow it to fall over.

• When feeding power with the DL1720E/DL1740E/DL1740EL cover open, apply
a flow of air to the AD4 board (or the AD2 board for the DL1720E) and Power
Supply (B8052YA*).

* Power Supply of the DL1720E/DL1740E/DL1740EL shipped before May 2005 is

B9989YA, and Power Supply of the DL1720E/DL1740E/DL1740EL shipped since May
2005 is B8052YA.

3

Adjustments

SM 701730-01E

3-1

3.2 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 thrity minutes after tuning ON the instrument.

• Confirm that self calibration is correctly executed after the thirty-minute warm up.
(Be sure to pay attention to the warm up time of all equipment that will be used in the
test.)

3-2

SM 701730-01E

3.3 Equipment Required

Table 3.1 Equipment Required

Equipment Critical Specification Recommended

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

Accuracy: < 0.02%
Square Wave
Frequency: 10 kHz
Output Level: > 60 V

Note

The values shown in the specification column are those indicated by this service manual only.
These values do not indicate the actual performances of the recommended equipment and
tools. Therefore, non-designated equipment and tools which satisfy the specifications are
permitted.

P-P

3

Adjustments

SM 701730-01E

3-3

3.4 DC Offset Adjustment on the AD Board

Procedure

1. Remove the top cover and shield cover.

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

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

DL1720E/DL1740E/DL1740EL

Calibrator

Programable Head

Figure 3.1 Connection Method

4. Press the SETUP key and select the Initialize soft key to execute initialization.

5. Press the MISC key and select the Calibration soft key.

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

7. Enter the settings on the DL1720E/DL1740E/DL1740EL and calibrator as follows.

3-4

DL1720E/DL1740E/DL1740EL

VERTICAL (for all channels)

V/div: 2 mV/div
Probe: 1:1
Offset: +1.000 V

Bandwidth: 20 MHz
HORIZONTAL T/div: 1 ms/div
ACQ Mode: Box Average
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

Calibrator

DC Output Level: +1.0000 V

8. Adjust the variable resistor (refer to table 3.2, “Adjustment Point” and figure 3.2,
“Adjustment Point Location Diagram”) corresponding to each channel so that the
DC waveform fits within 1 V ±1 mV as shown in figure 3.3, “Observed Waveform.”

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

Table 3.2 Adjustment Point

Channel Adjustment Point

CH1 R707
CH2 R714
CH3* R721
CH4* R728

* The DL1720E is not equipped with CH3 and CH4

SM 701730-01E

3.4 DC Offset Adjustment on the AD Board

3

Adjustments

SM 701730-01E

R721

R728

Figure 3.2 Adjustment Point Location Diagram

R707

R714

3-5

3.4 DC Offset Adjustment on the AD Board

Figure 3.3 Observed Waveform

3-6

SM 701730-01E

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 ten minuets or more.

3. Connect each instrument as shown in figure 3.4, “Connection Method.”

DL1720E/DL1740E/DL1740EL

Calibrator

Programable Head

Figure 3.4 Connection Method

4. Press the SETUP key and select the Initialize soft key to execute initialization.

5. Press the MISC key and select the Calibration soft key.

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

7. For adjustment of the /10 range, enter the settings on the DL1720E/DL1740E/
DL1740EL oscilloscope and calibrator as follows.

3

Adjustments

DL1720E/DL1740E/DL1740EL

VERTICAL (for all channels)

V/div: 100 mV/div

Probe: 1:1
HORIZONTAL T/div: 10 µs/div
TRIGGER Source: Input channel
ACQ Mode: Box Average
DISPLAY Format: Single

Calibrator

Waveform: Square wave
Frequency: 10 kHz
Amplitude: 600 mV

8. Adjust the variable capacitors CV101 and CV201, (refer to figure 3.5,
“Adjustment Point Location Diagram”) so that the top of the waveform becomes
flat as shown in figure 3.6, “Observed Waveform.” The waveform must fit within
±0.1 div.

P-P

SM 701730-01E

3-7

3.5 Flatness Adjustment on the Analog Board

9. For adjustment of the /100 range, enter the settings on the DL1720E/DL1740E/
DL1740EL oscilloscope and calibrator as follows.

DL1720E/DL1740E/DL1740EL

VERTICAL (for all channels)

HORIZONTAL T/div: 10 µs/div
TRIGGER Source: Input channel
ACQ Mode: Box Average
DISPLAY Format: Single

Calibrator

Waveform: Square wave
Frequency: 10 kHz
Amplitude: 6 V

10. Adjust the variable capacitors CV102 and CV202 (refer to figure 3.5,
“Adjustment Point Location Diagram”) so that the top of the waveform becomes
flat as shown in figure 3.6, “Observed Waveform.” The waveform must fit within
±0.1 div.

11. For adjustment of the /200 range, enter the settings on the DL1720E/DL1740E/
DL1740EL oscilloscope and calibrator as follows.

V/div: 1 V/div
Position: 0 div
Probe: 1:1

P-P

DL1720E/DL1740E/DL1740EL

VERTICAL (for all channels)

V/div: 10 V/div
Position: 0 div

Probe: 1:1
HORIZONTAL T/div: 10 µs/div
TRIGGER Source: Input channel
ACQ Mode: Box Average
DISPLAY Format: Single

Calibrator

Waveform: Square wave
Frequency: 10 kHz
Amplitude: 60 V

P-P

12. Adjust the variable capacitors CV103 and CV203 (refer to figure 3.5,
“Adjustment Point Location Diagram” ) so that the top of the waveform becomes
flat as shown in figure 3.6, “Observed Waveform.” The waveform must fit within
±0.1 div.

3-8

SM 701730-01E

3.5 Flatness Adjustment on the Analog Board

CV203 (CH2, CH4)

CV202

(CH2, CH4)

Figure 3.5 Adjustment Point Location Diagram

CV201 (CH2, CH4)

CV103
(CH1, CH3)

CV102
(CH1, CH3)

CV101
(CH1, CH3)

3

Adjustments

SM 701730-01E

Figure 3.6 Observed Waveform

3-9

Chapter 4 Troubleshooting

4.1 Introduction

This chapter describes possible solutions for rectifying errors. In such cases, assembly
removal may be required. Please heed the following warning.

Note

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).

If an error message is displayed, the error may have been caused by incorrectly operating the
unit. Refer to the user's manual (IM 701730-01E), and perform the correct operation.

4

Troubleshooting

SM 701730-01E

4-1

4.2 Flow Chart

Figure 4.1, “Troubleshooting Flow Chart” shows an analytical method for handling malfunctions.

START

Power ON

LCD OK?

No error

messages?

Check the

fuse.

Fuse OK?

Check secondary

voltage of power supply.

Vol tag e OK?

INITIALIZE

LCD OK?

(2)

Check error

contents.

†

*

Check secondary

voltage of power

supply not connected

to mother board.

Vol tag e OK?

(1)

Check each

board for shorts.

Check display.

Connect RGB VIDEO

OUT to monitor.

Monitor

display OK?

Replace
the fuse.

*

Replace

power supply

unit.

‡

Replace CPU

board ass’y.

4-2

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.

Figure 4.1 Troubleshooting Flow Chart

(3)

Check self test

results.

(4)

Check

performance

test results.

Check LCD

backlight.

Backlight

lights up?

* See section 4.4 for detailed instructions.

†

To initialize the settings, reboot the
DL1720E/DL1740E/DL1740EL while pressing the
RESET key.

‡

The monitor to be connected must be VGA
supported.

Replace lamp

unit or

inverter unit.

Replace LCD

ass’y.

SM 701730-01E

4.3 Assemblies to Check When an Error Occurs

(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 4.1 “Correspondence of Assembly to Voltage” shows the
relationship between assemblies and voltages supplied to them.

Table 4.1 Correspondence of Assembly to Voltage

Voltage Series Assembly No. Assembly

+24 V B8052MP Mother Board Assembly

B9989GP PRINTER Assembly (Option: /B5)
B9989SA FAN Assembly

+12 V B9989MG ET2 Board Assembly (MODEL: 701715)

B8052MH AD2 Board Assembly (MODEL: 701715)
B8052MB AD4 Board Assembly (MODEL: 701730/701740)
B8052MP Mother Board Assembly
A1468UP Inverter Unit

+5 V B9989MG ET2 Board Assembly (MODEL: 701715)

B9989ML ANALOG Board Assembly (MODEL: 701715/701730/701740)
B8052MH AD2 Board Assembly (MODEL: 701715)
B8052MB AD4 Board Assembly (MODEL: 701730/701740)
B8052MC CPU Board Assembly
B8052MF ACQ2S Board Assembly (MODEL: 701715)
B8052MD ACQ4S Board Assembly (MODEL: 701730)
B8052ME ACQ4L Board Assembly (MODEL: 701740)
B8052MP Mother Board Assembly
B9989MK KEY Board Assembly
B8051MG OPT TRIG Board Assembly (Option: /F5)
A1092UN FDD Unit (Model: -J1)
B8050MK PCMCIA Board Assembly (Model: -J3)

+3.3 V B8052MH AD2 Board Assembly (MODEL: 701715)

B8052MB AD4 Board Assembly (MODEL: 701730/701740)
B8052MC CPU Board Assembly
B8052MF ACQ2S Board Assembly (MODEL: 701715)
B8052MD ACQ4S Board Assembly (MODEL: 701730)
B8052ME ACQ4L Board Assembly (MODEL: 701740)
B8052MP Mother Board Assembly
B8052MS ETHER Board Assembly (Option: /C10)
B8051MG OPT TRIG Board Assembly (Option: /F5)

–2 V B9989ML ANALOG Board Assembly (MODEL: 701715/701730/701740)

B8052MH AD2 Board Assembly (MODEL: 701715)
B8052MB AD4 Board Assembly (MODEL: 701730/701740)
B8052MF ACQ2S Board Assembly (MODEL: 701715)
B8052MD ACQ4S Board Assembly (MODEL: 701730)
B8052ME ACQ4L Board Assembly (MODEL: 701740)
B8052MP Mother Board Assembly

–5.2 V B9989MG ET2 Board Assembly (MODEL: 701715)

B9989ML ANALOG Board Assembly (MODEL: 701715/701730/701740)
B8052MH AD2 Board Assembly (MODEL: 701715)
B8052MB AD4 Board Assembly (MODEL: 701730/701740)
B8052MP Mother Board Assembly

–12 V B9989MG ET2 Board Assembly (MODEL: 701715)

B8052MH AD2 Board Assembly (MODEL: 701715)
B8052MB AD4 Board Assembly (MODEL: 701730/701740)
B8052MP Mother Board Assembly

4

Troubleshooting

SM 701730-01E

4-3

4.3 Assemblies to Check When an Error Occurs

(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 4.2, “Correspondence of
Messages to Defective Assemblies,” shows which kind of trouble may be due to a
hardware failure.

Table 4.2 Correspondence of Messages to Defective Assemblies

Code Message Assembly No. Assembly

713 Calibration failure.... B9989MG ET2 Board Assembly (MODEL: 701715)

901 Failed to backup setup data.... B8052MC CPU Board Assembly

906 Fan stopped.... B9989SA FAN Assembly

907 Backup battery is flat. B8052MC CPU Board Assembly
* Power Supply of the DL1720E/DL1740E/DL1740EL shipped before May 2005 is B9989YA,

and Power Supply of the DL1720E/DL1740E/DL1740EL shipped since May 2005 is
B8052YA.

B9989ML ANALOG Board Assembly

(MODEL: 701715/701730/701740)
B8052MH AD2 Board Assembly (MODEL: 701715)
B8052MB AD4 Board Assembly

(MODEL: 701730/701740)
B8052MC CPU Board Assembly
B8052MF ACQ2S Board Assembly (MODEL: 701715)
B8052MD ACQ4S Board Assembly (MODEL: 701730)
B8052ME ACQ4L Board Assembly (MODEL: 701740)
B8052MP Mother Board Assembly

B8052YA* Power Supply
B8052MP Mother Board Assembly
B8052MC CPU Board Assembly

(3)

When trouble occurs, check the test item displaying FAIL and select the relevant
defective item from table 4.3, “Correspondence of Test Items to Defective Assemblies.”
If necessary, replace the relevant assembly.

Table 4.3 Correspondence of Test Item to Defective Assemblies

Test Item Assembly No. Assembly

Key Board B8052MC CPU Board Assembly

Memory B8052MC CPU Board Assembly
FDD B8052MC CPU Board Assembly

PC Card B8052MC CPU Board Board Assembly

Printer B8052MC CPU Board Assembly

Accuracy B9989MG ET2 Board Assembly (MODEL: 701715)

B8052MP Mother Board Assembly
B9989MK KEY Board Assembly

A1092UN FDD Unit (Model: -J1)

B8050MK PCMCIA Board Assembly (Model: -J3)

B8052MP Mother Board Assembly
B9989GP Printer Assembly (Option: /B5)

B9989ML ANALOG Board Assembly (MODEL: 701715/701730/701740)
B8052MH AD2 Board Assembly (MODEL: 701715)
B8052MB AD4 Board Assembly (MODEL: 701730/701740)
B8052MC CPU Board Assembly
B8052MF ACQ2S Board Assembly (MODEL: 701715)
B8052MD ACQ4S Board Assembly (MODEL: 701730)
B8052ME ACQ4L Board Assembly (MODEL: 701740)
B8052MP Mother Board Assembly

4-4

SM 701730-01E

4.3 Assemblies to Check When an Error Occurs

(4)

When trouble occurs, check the non-conforming test and select the relevant defective
assembly from table 4.4, “Correspondence of Test Items to Defective Assemblies.” If
necessary, replace the relevant assembly.

Table 4.4 Correspondence of Test Item to Defective Assemblies

Test Item Assembly No. Assembly

2.5Vertical Axis DC B9989ML ANALOG Board Assembly (MODEL: 701715/701730/701740)
Voltage Accuracy B8052MH AD2 Board Assembly (MODEL: 701715)
Test B8052MB AD4 Board Assembly (MODEL: 701730/701740)

2.6Frequency B9989ML ANALOG Board Assembly (MODEL: 701715/701730/701740)
Response Test B8052MH AD2 Board Assembly (MODEL: 701715)

B8052MB AD4 Board Assembly (MODEL: 701730/701740)

2.7Time-base B9989ML ANALOG Board Assembly (MODEL: 701715/701730/701740)
Accuracy Test B8052MH AD2 Board Assembly (MODEL: 701715)

B8052MB AD4 Board Assembly (MODEL: 701730/701740)

2.8Trigger Sensitivity B9989ML ANALOG Board Assembly (MODEL: 701715/701730/701740)
Test B8052MH AD2 Board Assembly (MODEL: 701715)

B8052MB AD4 Board Assembly (MODEL: 701730/701740)

2.9Trigger Accutracy B9989ML ANALOG Board Assembly (MODEL: 701715/701730/701740)
Test B8052MH AD2 Board Assembly (MODEL: 701715)

B8052MB AD4 Board Assembly (MODEL: 701730/701740)

4

Troubleshooting

SM 701730-01E

4-5

4.4 Power Supply Secondary Voltage

Check whether the power supply secondary voltage fits the values listed on figure 4.2,
“Power Supply Secondary Terminals” and Table 4.5, “Power Supply Secondary
Terminal’s Name.”

7

9

11

13

15

17

27

29

28

30

23

25

24

26

Figuer 4.2 Power Supply Secondary Terminals

Table 4.5 Power Supply Secondary Terminal’s Name

Pin No. Name

1 Sense
2, 4 +24 V
5 Remote
6 AC 5 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

19

21

8

10

12

14

16

18

20

22

3

5

6

1

2

4

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.

4-6

SM 701730-01E

Chapter 5 Schematic Diagram

5.1 Schematic Diagram

ETHERNET

GP-IB

VIDEO

OUT(VGA)

USB

USB

CN301 CN302 CN6 CN300 CN100

PERIPHERAL

FDD

A1161UN

ASSY

B8052MS

(Option: /C10)

ETHER BOARD

CN1
CN3CN303CN601

(Select: -J1)

Ferrite Core

B8050WD

B8052SD

B8052MC

FAN

B9989SA

CN5

B8050MK

B8052SC

CPU BOARD ASSY

B8052YA*

(Select: -J3)

CN002CN001

Ferrite Core

B9914ZF

UNIT

POWER

SUPPLY

ASSY

BOARD

PCMCIA

B8052SB

CN600

CN2

CN1

PS30

CN11

CN1

CN2

B8052MP

MOTHER BOARD ASSY

Sense Head Motor

CN201 CN202 CN203

CN101

B9989YE

B9989GP

(Option: /B5)

PRINTER ASSY

CN1

B9989MK

KEY BOARD ASSY

5

Schematic Diagram

SM 701730-01E

CN100

GO/NO-GO

PROBE POWER(Option: /P4, /P2)

/P4: B8052SE × 4

/P2: B8052SE × 2

EXT CLOCK IN/EXT TRIG IN/TRIG GATE IN: 701730/701740 (4CH)

None: 701715 (2CH)

OUT

TRIG

B9989SG

B9989SF

Figure 5.1 Schematic Diagram of the DL1720E/DL1740E/DL1740EL

CN12 CN13 CN14

CN11

CN15 CN16

B9989ML

CH1

B8052MD

ACQ4S BOARD ASSY

(701730)

B8052MB

AD4 BOARD ASSY

(701730/701740)

CN5
CN1

ASSY

BOARD

ANALOG

CH2

B8052ME

ACQ4L BOARD ASSY

(701740)

CN2
CN7

B8052MH

AD2 BOARD ASSY

(701715)

CN1

B9989ML

ANALOG

BOARD ASSY

(701730/701740)

CH3/

NON

B8052MF

ACQ2S BOARD ASSY

B9989MG

ET2 BOARD

ASSY

(701715)

CH4/

EXT.

(701715)

CN3 CN6

B9969SC

COMP

GND

CN1

CN12

CN1

CN1

CN10

CN13

B8052SA

OPT TRIG

B8051MG

(Option: /F5)

BOARD ASSY

CN302 CN301

CN4

B9989SD

SW

LCD

BOARD

B9989YD

CN1

ASSY

B9958LD

CN2

LCD

A1056VA

B9989SB

A1468UP

Inverter

* Power Supply of the DL1720E/DL1740E/DL1740EL shipped before May 2005 is B9989YA,

5-1

and Power Supply of the DL1720E/DL1740E/DL1740EL shipped since May 2005 is B8052YA.

Chapter 6 Customer Maintenance Parts List

6.1 Customer Maintenance Parts List

6

Customer Maintenance Parts List

1M

Ω

20

p

F

C

40

H

1

0

V

p

k

CA

T

50

C

Ω

H

2

5

V

r

m

s

,

10V

p

k

C

H

3

C

H

4

Note: Parts marked with a symbol are Customer Maintenance Parts (CMP) .

SM 701730-01E

6-1

6.1 Customer Maintenance Parts List

Complete Set

12

11

10

9

7

6

15

5

14

8

4

1M

Ω

/20

p

F

_

<

CH

4

0

1

0

V

p

k

C

A

T

50

C

Ω

H

_

<

2

5V

r

m

s

,

1

0

V

p

k

C

H

3

C

H

4

Item

Part No.
B9989EC Support

11
2

B9989DA Top Cover1
Y9408LB B.H. Screw, M4x8

3

Y9408LB 2

4

B9989EC Support1

5

B9989EU Sheet1

6

B9989DT Printer Cover1

7

B9989DU Handle1

8

B9946BQ Sheet ( /B5)1

9

B9858GB Clamp1

10

Qty

4

Description

B.H. Screw, M4x8

13

1

Item

Part No.

B9989DR Printer Case

11 1
12

B9989CJ Frame1

- Main Assembly

13

B8052DN 1

14

B8052DP Sheet ( /P4)1

B8052DH Sheet ( /C10)1

15

B8052DJ Sheet (not /C10)1
A9657ZJ Name Plate1

16

Note:

Qty

1

CMPL parts

2

Description

Sheet ( /P2)

16

3

(select)

(select)

6-2

SM 701730-01E

Main Assembly

6.1 Customer Maintenance Parts List

14

13

10

9

8

6

5

7

12

11

15

16

17

18

19

6

21

20

38

4

22

3

2

1

23
24

25

26

39

27

Customer Maintenance Parts List

SM 701730-01E

36

35

34
33

31

37

32

28

41

40

29

30

6-3

6.1 Customer Maintenance Parts List

Item

Part No. Qty Description

11 B9989DY Knob
12 B9989DX Knob
13 B8052DE Sheet (701715)
1B8052DF Sheet (701730, 701740)
24 B9989DK Knob

35 B9989EL Spring
16 B9989DL Knob
97 B9969DK Lens
18 B9989DM Knob
19 B9969DE Knob

110 B8052DA Front Bezel (701715)

Front Bezel (701730)

1B8052DB

Front Bezel (701740)

1B8052DC
111 B9989SD Cable Assembly (AD-Switch)
112 A1056VA LCD

B9958LD LCD-CN Board Assembly
14
15

B8052MP Mother Board Assembly
19
20

B9989DH Knob (701730, 701740)
23
24

113

Screw

4Y9205LB

Front Frame

1B9989CA
216 A9135ZM Spacer
117 A1468UP Power Supply

118

SUMI-Card,BUS-KBD

1B9989YE

Key Board Assembly

1B9989MK
121 B9989DQ Knob
122 B9989DG Knob (701715)

1

I/O Device ( /B5)

1A1207UD

Screw ( /B5)

3Y9205LB
125 A1161UN Memory System (-J1)
126 B8050WD SUMI Card (-J1) (CPU-Floppy)

(select)

(select)

(select)

12728B9989SA Fan Assembly

B.H. Screw,M3x8

29

B8052MB AD4 Board Assembly (701730, 701740)

30

B8052MH

B9989QA

33

B8052ME

34

B8052YA Power Supply
35
36
37 B8052CU

38

B9850EG TIP
39
40
41 B8051EN

4Y9308LB

PCMCIA Assembly (-J3)

1B8050MK
1

AD2 Board Assembly (701715)1

13132B9989QA

Analog Assembly
Analog Assembly (701730, 701740)

1

ET2 Assembly (701715)

1B9989QG
1B8052MD ACQ4S Board Assembly (701730)

ACQ4L Board Assembly (701740)1

ACQ2S Board Assembly (701715)1B8052MF

1

Ethernet Assembly ( /C10)

1B8052BX
1B8052MC CPU Board Assembly

Bracket1

Cable Assembly1B8052SA

1

Rod

1B9850EF
1B8051MG OPT Trig Board Assembly ( /F5)

Stud ( /F5)2

(select)

(select)

(select)

Note : CMPL parts

6-4

SM 701730-01E

6.2 Standard Accessories

Standard Accessories

1

8

9

2

3

10

6

Customer Maintenance Parts List

4

12

5

6

11

13

14

SM 701730-01E

Part No.

Item

1 A1006WD

A1253JZ

2

A1006WD

3

A1009WD

4

A1054WD

5

A1024WD

6

A1064WD

7

B9850NX

8

B9918EZ

9

10

B9989FA

11

B9989EX

12

A1352EF

13

700988

14

700988

15

7

15

Qty

Description

1Power Supply Code

3P-2P Adapter

1

Power Supply Code (Suffix code-D, UL.CSA standard)

1

Power Supply Code (Suffix code-F, VDE standard)

1

Power Supply Code (Suffix code-Q, BS standard)

1

1

Power Supply Code (Suffix code-R, AS standard)

1

Power Supply Code (Suffix code-H, GB standard)
Roll Chart ( /B5)

1

Soft Case

-

-

1

Manuals

1

Front Cover

1

Stopper

1

Fuse (250V / 4A)

1

Probe (701715)

2

Probe (701730, 701740)

4

CD for Manual for DL1740E

1

(Suffix code-D, UL.CSA standard)

(select)

Note : * For use in Japan only,
Suffix code-M
CMPL parts

6-5

Chapter 7 Procedures for Disassembly

7.1 Flow Chart of Disassembly

Top Cover

Fan Assy

Printer Case

CPU Board Assy

Printer Unit

Front Bezel

(Section 7.2)

(Section 7.3)

(Section 7.4)

(Section 7.5)

Ether Board Assy

(Section 7.6)

Inverter Assy

(Section 7.8)

PC Card Drive/FDD Assy

Key Board Assy

LCD

Power Supply Assy

Input Assy

(Section 7.17)

(Section 7.7)

(Section 7.9)

(Section 7.10)

(Section 7.11)

(Section 7.12)

(Section 7.13)

7

7

Procedures for Disassembly

AD Board Assy

Analog Assy/ET2 Assy

ACQ Board Assy

(Section 7.14)

(Section 7.15)

(Section 7.16)

SM 701730-01E

7-1

7.2 Removing the Top Cover

1. Remove the two screws from the rear panel as shown.

2. Remove the four screws from the bottom of the instrument as shown.

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 arrow as shown
in the figure below.

DL with the Top Cover Removed

7-2

SM 701730-01E

7.3 Removing the Fan Assy

1. Remove the top cover. See section 7.2, “Removing the Top Cover.”

2. Remove the cables on the right side panel as you face the instrument as shown
in the figure below.

3. Remove the three screws from the rear panel as shown in the figure.

7

7

Procedures for Disassembly

DL with the Fan Assy Removed

SM 701730-01E

7-3

7.4 Removing the Printer Case

1. Remove the top cover. See section 7.2, “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.

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

DL with the Printer Case Removed

7-4

SM 701730-01E

7.5 Removing the CPU Board Assy

1. Remove the printer case. See section 7.4, “Removing the Printer Case.”

2. Remove the screw from the left side panel as shown in the figure.

3. Remove the screw from the right side panel as shown, then remove the
multiconductor(s) (there are two multiconductors with a PC card, and one with a
floppy disk drive).

7

7

Procedures for Disassembly

4. Pull out the CPU Board Assy in the direction of the arrow as shown in the figure
below, then remove the assy.

DL with the CPU Board Assy Removed

SM 701730-01E

7-5

7.6 Removing the Printer Unit

1. Remove the printer case. See section 7.4, “Removing the Printer Case.”

2. Remove the two screws from the left side panel as shown in the figure below.
Next, remove the handle and bracket in the direction of the arrow.

DL with the Handle and Bracket Removed

3. Remove the screw as shown in the figure below, then remove the roll paper
holder in the direction of the arrow.

7-6

SM 701730-01E

7.6 Removing the Printer Unit

4. Remove the two screws as shown in the figure below, then remove the cover in
the direction of the arrow.

5. Remove the cable in the direction of the arrow shown in the figure below.

6. Remove the screws from the left side panel as shown in the figure below.

7. Remove the screw from the right side panel as shown in the figure below.

7

7

Procedures for Disassembly

SM 701730-01E

7-7

7.6 Removing the Printer Unit

8. Remove the two screws as shown in the figure below, then lift up the I/O device
in the direction of the white arrow.

DL with the I/O Device Removed

9. Disconnect the three cable connectors as shown in the figure below, then
remove the cables.

DL with the Printer Unit Removed

7-8

SM 701730-01E

7.7 Removing the Inverter Assy

1. Remove the printer unit. See section 7.6, “Removing the Printer Unit.”

2. Remove the two screws as shown, disconnect the three cables, then remove
the assy.

DL with the Inverter Assy Removed

7

7

Procedures for Disassembly

SM 701730-01E

7-9

7.8 Removing the Front Bezel

1. Remove the printer case. See section 7.4, “Removing the Printer Case.”

2. Pull out the three knobs in the direction of the arrow shown in the figure below
and remove them.

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.

3. As shown in the figure below, lift up the eight tabs that surround the Front Bezel,
then remove the Front Bezel.

7-10

DL with the Front Bezel Removed

SM 701730-01E

7.9 Removing the PC Card Drive/FDD Assy

1. Remove the front bezel. See section 7.8, “Removing the Front Bezel.”

2. Remove the multiconductor(s) (there are two multiconductors with a PC card
drive, and one with a floppy disk drive), then remove the two screws as shown in
the figure below.

DL with the PC Card Drive/FDD Assy Removed

7

7

Procedures for Disassembly

SM 701730-01E

7-11

7.10 Removing the Key Board Assy

1. Remove the front bezel. See section 7.8, “Removing the Front Bezel.”

2. Remove the five screws as shown in the figure below.

3. Remove the multiconductor as shown in the figure.

DL with the Key Board Assy Removed

7-12

SM 701730-01E

7.11 Removing the LCD

1. Remove the printer unit and the front bezel. See section 7.6, “Removing the
Printer Unit” and section 7.8, “Removing the Front Bezel.”

2. Remove the two cables, then remove the multiconductor as shown in the figure below.

3. Remove the four screws as shown in the figure below.

7

7

Procedures for Disassembly

4. Remove the LCD and board as shown in the figure below.

DL with the LCD Removed

SM 701730-01E

7-13

7.12 Removing the Power Supply Assy

1. Remove the fan assy and the front bezel. See section 7.3, “Removing the Fan
Assy” and section 7.8, “Removing the Front Bezel.”

2. Remove the two screws, then remove the bracket as shown in the figure below.

3. Remove the three screws as shown in the figure below.

4. Remove the three screws as shown in the figure below.

5. Pull out the Power Supply Assy as shown in the figure below and remove it.

7-14

SM 701730-01E

7.12 Removing the Power Supply Assy

DL with the Power Supply Assy Removed

7

7

Procedures for Disassembly

SM 701730-01E

7-15

7.13 Removing the Input Assy

1. Remove the fan assy and the front bezel. See section 7.3, “Removing the Fan
Assy” and section 7.8, “Removing the Front Bezel.”

2. Remove the two screws as shown in the figure below.

3. Remove the five screws as shown in the figure below.

4. Remove the two screws, then remove the bracket as shown in the figure below.

5. Remove the five screws, then remove the cable as shown in the figure below.

7-16

SM 701730-01E

7.13 Removing the Input Assy

6. Remove the left shield plate as shown in the figure below.

7. Remove the right shield plate as shown in the figure below.

8. Remove the cable as shown in the figure below.

9. Lift up the front end of the board assy as shown in figure below (left), then pull it
out in the direction of the rear panel as shown in figure below (right).

7

7

Procedures for Disassembly

SM 701730-01E

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7.13 Removing the Input Assy

DL with the Input Assy Removed

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7.14 Removing the AD Board Assy

1. Remove the input assy. See section 7.13, “Removing the Input Assy.”

Note

The AD Board Assy is easier to remove if you first remove the ACQ Board Assy. See
section 7.16, “Removing the ACQ Board Assy.”

2. Remove the four screws as shown in the figure below, then remove the nuts as
shown in the figure below.

3. As shown in the figure below, remove the eight screws, then remove the six
cables.

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

If an option is installed, remove the two screws securing the option and the
option itself, then remove the studs.

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Procedures for Disassembly

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7.14 Removing the AD Board Assy

DL with the AD Board Assy Removed

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7.15 Removing the Analog Assy/ET2 Assy

1. Remove the input assy. See section 7.13, “Removing the Input Assy.”

2. Remove the two screws, then remove the cover as shown in the figure below.

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

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Procedures for Disassembly

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

DL with the Analog Assy/ET2 Assy Removed

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7.16 Removing the ACQ Board Assy

1. Remove the input assy. See section 7.13, “Removing the Input Assy.”

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

3. Remove the six screws as shown in the figure below.

DL with the ACQ Board Assy Removed

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7.17 Removing the Ether Board Assy

1. Remove the CPU board assy. See section 7.5, “Removing the CPU board
Assy.”

2. Remove the three screws as shown in the figure below.

DL with the Ether Board Assy Removed

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Procedures for Disassembly

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