S9 Operator Board Maintenance Instructions
16
、
DC-DC Circuit
LM27402SQ Voltage Regulator Generation PWM Switching signals drive up and down bridges (Two pairs CMOS），and through L2
Inductor Energy Storage, Again by C19、C20 Filtering.
LM27402SQ Main function Pin
Pin 7 ：12V Power supply，
Pin 9, 17：GND，
Pin 2 ：FB Feedback Connection PIC Voltage determined by pin 8 of Pic to decide.
Pin 10 ：Vdd
Pin 13 ：Bootstrap capacitance 10v +
Pin 16 ：Pulse
Pin 12 ：Switching signal
Pin 11 ：Lower Bridge Drive
Pin 14 ：Upper Bridge Drive
DC-DC When the voltage is abnormal
，
First check through the fixture printing information to view PIC is the voltage value DC-DC is the output voltage one to
；
If
there is a disagreement between
，
Please change first
LM27402SQ The small capacitance around
；
If DC-DC No output
，
Please check R13
、
R14 Voltages 1v on both sides - R11 Voltage 12V
、
PIC Whether the work is abnormal, PIC Whether the control panel can
be accepted properly
I2C Signal.
DC-DC Output voltage Standard
：
14T Operation Board
：
8.3 V-8.6 V
13.5T Operation Board： 8.4 V-8.7 v
10
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