Read Panasonic KX-NS500 / KX-NS520 Service Manual Supplement online
5
2 Technical Descriptions
2.1.
Power Supply Unit
Changed from Original Service Manual as section 4.4.
This unit is switching regulator power supply and supplies DC voltages to CPU Board (MPR), and optional card (free slot).
PSU (power supply unit) has two outputs (41V, 15V). 15V output is supplied only in CPU Board (MPR) and option card.
Other outputs are mainly used as an object for the electric supply to a terminal.
PSU (power supply unit) has two outputs (41V, 15V). 15V output is supplied only in CPU Board (MPR) and option card.
Other outputs are mainly used as an object for the electric supply to a terminal.
2.1.1.
Block Diagram and Circuit Description of PSU
Changed from Original Service Manual as section 4.5.1.
2.2.
AC input, Rectification Smoothing Circuit
Changed from Original Service Manual as section 4.6.
1) Filter Circuit
This circuit consists of the following components and removes the exogenous noise or the noise generated at power supply.
CX1, CX2: normal mode filter (X-Capacitor)
LF1, LF2: common mode noise filter
CY1, CY2: common mode noise filter (Y-Capacitor)
CX1, CX2: normal mode filter (X-Capacitor)
LF1, LF2: common mode noise filter
CY1, CY2: common mode noise filter (Y-Capacitor)
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