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Service
Manual
DL1720E/DL1740E/DL1740EL
Digital Oscilloscope
SM 701730-01E
2nd Edition
Yokogawa Electric Corporation
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. Do not use the wrong manual.
Before any maintenance and servicing, read all safety precautions carefully. Only
properly trained personnel may carry out the maintenance and servicing described 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 and assemblies). Therefore if an assembly fails, the user should replace the
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.
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: