Service manual

Page 24
MODEL: L423FR
3.3.
3.3.
3.
Power circuit Power circuit
Power circuit Power circuit
Power circuit
For power supply of L423FR, there are the power supply of “always on” and “ON/OFF” with a control signal.
(P)IC9X10, IC9W10, IC9A10 : Power supply control IC(power factor correction) (FA5501 : FUJI)
This IC are control IC for a power factor correction converter using critical conduction mode of operation.
This IC performs a power factor correction by conversion the current waveform from triangle waveform to
sine waveform.
(P)IC9X11, IC9W11, IC9A11 : Power supply voltage control IC (F9222 : FUJI)
This IC controls the power supply voltage by switching about 100KHz.
This IC has MOSFET inside IC, keep switching on and off, and controls its duty to be stable output voltage.
Power
source
signal
Voltage
[V ]
“always on”
or
“ON/OFF”
Control
signal
Output
IC
Note
24V 24 ON/OFF Psave1 For inverter
24V 24 always on -For
MAIN/B,
SUB/B
A12V 12 ON/OFF Psave2 IC860
A9V 9 ON/OFF Psave2 IC820
S8V 8 always on -IC850
S5V 5 always on -IC890
A5V 5 ON/OFF Psave2 IC8X0
AMPVC
C
14 ON/OFF Psave3 IC880
SAMPVC
C
14 ON/OFF Psave3 IC870
4.5V 4.5 ON/OFF Psave2 IC840
A3.3V 3.3 ON/OFF Psave2 IC8A0
D3.3V 3.3 ON/OFF Psave2 IC8E0
AD3.3V 3.3 ON/OFF Psave2 IC8F0
D2.5V 2.5 ON/OFF Psave2.5 IC8H0
A1.8V 1.8 ON/OFF Psave2.5 IC8J0
S3.3V 3.3 always on -IC830
D1.8V 1.8 ON/OFF Psave2.5 IC8K
A1.5V 1.5 ON/OFF Psave2 IC8L0
D1.5V 1.5 ON/OFF Psave2 IC8L0