7-11
2.9.2 MAIN Power Supply ON/OFF Circuit
When the power switch (SW901) is turned on, at fast, the SUB SW.REG converter circuit starts oscillation.
And the voltage of secondary output (5VA) is raised to 5V.
The Micro-computer on MAIN PWB starts operating, and SW.REG PWB is received “PMS” signal (approx
3V). Q9E1 turned on, and the signal is transmitted to the primary side through PC911.
On the primary side, Q930 is turned on, Q932 is turn on, and Q931 is turned off.
Therefore, Q933, Q908 is turned on, and the MAIN Power Supply and Power Factor Collector (PFC) circuits
begin operating. The voltage of secondary outputs 18VC are raised.
When the PMS (power save) MODE, “PMS” signal drops to low. Opposite operation is done, and The
Voltage of secondary outputs 18VC are stopped.
PMS
(ON/OFF
SIGNAL)
5VA
R9E7
Q9E1
PC911
IC901
Q930
Q932
PC911
R931
C9A2
D9A2 L9A1 T9A1
D930
ZD930
R934
Q931
R933
R935
R936
R937
R904
R905
R906
Q908
ZD908
D901
R908
D915 Q933
R911 T901
C910
D911
R908
(Fig. 2.9.2) MAIN Power Supply ON/OFF Circuit
Содержание LCD2080UX - MultiSync - 20.1" LCD Monitor
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