Panasonic KX-NS1000UC (serv.man6) Service Manual ▷ View online
17
KX-NS1000UC
4.4.5.4.
Back Board Signaling
For SLC (Common for each Option Service Card)
Back Board Signaling is described as below. These signals are different for each Option Service Card.
For PRI23
For PRI30
For BRI4
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KX-NS1000UC
For LCOT2
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KX-NS1000UC
4.5.
Power Supply Unit Circuit Operation
4.5.1.
AC Section and Rectifier Circuit
Provides a description from AC input to the rectifier smoothing circuit.
1. Filter circuit
Consisting of the following parts, removes exogenous noise and noise generated by the power source.
C1/C2 : Normal mode filter (X capacitor)
L1/L2 : Common mode noise filter
C3/C4 : Common mode filter (Y capacitor)
C1/C2 : Normal mode filter (X capacitor)
L1/L2 : Common mode noise filter
C3/C4 : Common mode filter (Y capacitor)
2. Rectifier circuit
Consisting of the following parts, the rectifier circuit converts alternating current to direct current.
D1, D2, D3, D4 : Diode
C8 : Primary smoothing capacitor
D1, D2, D3, D4 : Diode
C8 : Primary smoothing capacitor
3. Surge absorber circuit
Consisting of Z1, the surge absorber circuit protects the equipment from exogenous surge such as lightning surge.
Z1 : Varistor
Z1 : Varistor
4. Rush current prevention
Suppresses rush current to smoothing capacitor immediately following AC input by the following parts.
NTC1 : Thermistor
NTC1 : Thermistor
5. AC voltage detection circuit
Consisting of the following parts, the AC voltage detection circuit detects presence of AC input voltage input.
D5, D18, R6-R21, Q2, Q3, Q4, PC3 Rectifies AC voltage by D5 and D18.
If AC input voltage exceeds threshold voltage, Q2, Q3 and Q4 turn "on" and the secondary side is informed of presence of AC
input through PC3.
D5, D18, R6-R21, Q2, Q3, Q4, PC3 Rectifies AC voltage by D5 and D18.
If AC input voltage exceeds threshold voltage, Q2, Q3 and Q4 turn "on" and the secondary side is informed of presence of AC
input through PC3.
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KX-NS1000UC
4.5.2.
Main Converter
Provides a description of the main converter that insulates primary DC voltage and converts it to secondary (32V output).
1. Main converter section (primary side)
Consisting of the following parts, the primary side main converter is an insulated, separately-excited flyback converter.
Q1: Main switch FET
T1: Insulated transformer
IC1: Control IC for Q1 control
PC1: Secondary control transmission element
Other peripheral circuitry
Secondary output status is transmitted from PC1 to the primary side; on/off control is executed by IC1 to control secondary
voltage.
Q1: Main switch FET
T1: Insulated transformer
IC1: Control IC for Q1 control
PC1: Secondary control transmission element
Other peripheral circuitry
Secondary output status is transmitted from PC1 to the primary side; on/off control is executed by IC1 to control secondary
voltage.
2. Main converter section (secondary side)
This is a T1 isolation transformer output, consisting of rectification smoothing circuits of D101, C102, C106 to C11.
32V output and power source for output voltage (Refer to Part3).
32V output and power source for output voltage (Refer to Part3).
3. Latch Operation Section
Latch circuit for main converter stop due to abnormal state such as excessive output voltage.
Transmits abnormal state detected on secondary side (described in Part 5) to IC1 by PC2 primarily using the IC1 latch func-
tion and stops the main converter by latching.
Latching is canceled 60 seconds after the source of the abnormal state is removed and AC input is off, and is reset to ordinary
operation when AC power is turned back on.
Transmits abnormal state detected on secondary side (described in Part 5) to IC1 by PC2 primarily using the IC1 latch func-
tion and stops the main converter by latching.
Latching is canceled 60 seconds after the source of the abnormal state is removed and AC input is off, and is reset to ordinary
operation when AC power is turned back on.
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