LeCroy LC564DL, Service Manual

Page: 146 / 210

6-12 Maintenance
6.6 Troubleshooting and Flow Charts
6.6.1 Introduction
T
he troubleshooting information contained in this section is intended for use
by qualified personnel having a basic understanding of electronics (analog and
digital). In order to simplify servicing and minimise downtime, the following list of
possible symptoms, likely causes, and troubleshooting steps have been prepared.
The first step in troubleshooting is to check for obvious items like blown fuses.
The power supply is the next item to check before proceeding to more detailed
troubleshooting, since noise or low power supply voltages can cause a variety of
digital and analog problems.
6.6.2 Line Fuses Replacement
The power supply of the oscilloscope is protected against short circuits and
overload by means of two T6.3A / 250 V fuses located above the main plugs.
Turn off the power and disconnect the line cord from the instrument
Disconnect the instrument from other equipment.
To replace line fuses, proceed as follow:
•
Open the fuse box by inserting a small flat screwdriver under the plastic cover
and remove the fuse carrier from the holder
•
Remove the fuse and replace it with the proper type: T6.3 A / 250 V, LeCroy part
number: 433 162 630
6.6.3 Initial Troubleshooting Chart
Most procedures in this section will allow troubleshooting down to the BOARD
LEVEL.
Defective circuit boards will be repaired or exchanged by the regional LeCroy
service office or the local representative (see section 2.2).