Power Supply; Input Voltages - LeCroy WaveSurfer 400 Series Service Manual

4.7 Power Supply

as the primary side of the power unit has many high voltage portions to ground.
Power Supply Unit comprises of INLET BOARD, PFC BOARD and MAIN BOARD.
The INLET BOARD includes EMI Filters.
The PFC BOARD includes Pre-converter, which is operated Power Factor
Correction.
The MAIN BOARD includes Main Converter (off line), House Keeping Power
Supply, Post Converters, Filters, Power OK Generater circuit and internal Bias
Supply Circuits.
EMI
Filters
INLET
BOARD
Main
Converter
House
keeping
Power
Supply
MAIN POWER BOARD

4.7.1 Input Voltages

The power supply supports a wide ranges of inputs, 90-132 V AC (45-65HZ, 360-
440Hz) and 90-264V AC (45-65Hz) are allowed.
4-16 Theory of Operation
Do not touch any electric parts inside the power supplies during operation
Pre-Converter
PFC
PFC BOARD
5VDIG and 3.3V DC/DC
5VANA and 2.5V DC/DC
9V and 12V DC/DC
-5V and -12V
Foward Converter
Figure 4-13 Power Supply Block Diagram
Filter
(5vANA)
Filter
(12v)
Filter
(-5v)
Filter
(-12v)
POWER_OK_GEN
Solid Line Blocks represent Daughter Boards.
5VDIG
3.3V
2.5V
5VANA
9V
12V
-5V
-12V
PW_OK