• Assemble the lower cover and upper cover.
• Plug in the power cord and turn on the LT Series.
• Wait for fifteen minutes.
• Enter the internal menus by pressing menu soft-keys 3 & 4, then release soft-key
3, then release soft-key 4, then press soft-key 5.
• Select “Maintenance”, “Board Test Results”, “Adjust”.
• Press “Measure Board Items”, and wait till “Succeeded” is displayed.
• Press “Measure Overload”, and wait till “Measure Complete” is displayed.
• Press “Save Result to EEPROM” two times.
Note ; Do not press the other menu keys, or some calibration data of Main Board
may be lost.
This section does not include the other manual adjustments of Main Board,
and does not contain any instructions or descriptions about Main Board calibration.
Main Board adjustments required complex test set-up and calibration Software.
For information on the availability of the tester and software, contact your nearest
LeCroy service centre.
6.4.3 Power Board Exchange Procedure
After Power Board is exchanged, confirm the voltage as the following procedure.
• Remove the upper cover and the lower cover. (see 7.G)
• Turn the scope upside down.
• Turn on the power, set the scope to Auto Trigger and 500MS/s.
• Confirm the following voltage on solder side of Main Board within ten minutes.
+12V analog (Min = +11.76V, Max = +12.24V) 21C11
+5V analog (Min = +4.925, Max = +5.075V) 21C21
-5V analog (Min = -4.975V, Max = -5.05V) 21C71
-12V analog (Min = -11.76V, Max = -12.24V) 21C61
+5V digital (Min = +4.85V, Max = +5.15V) 21C41
-4.5V digital (Min = -4.365V, Max = -4.635V) 21C91
Note ; Do not turn the potentiometers on Power Board.
Do not keep the condition that the lower cover is removed, or the heat sinks will
become hot and the condition may damage some components on Main Board.
This section does not include the other manual adjustments of Power Board, and
does not contain any instructions or descriptions about Power Board calibration.
Power Board adjustments required complex test set-up.
For information on the availability of the tester, contact your nearest LeCroy service
centre.
6.5 Troubleshooting and Flow Charts
6.5.1 Introduction
Maintenance 6-5
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