Power Section - Sharp SF-2314 Service Manual

(3) LED display
The LED is lit up by the signal matrix of MDL0 (Q1) ∼ MDL1 (Q2) and
F0 (Q3) ∼ F20 (Q23).
By turning on/off ports F0 ∼ F20 with the timing of MDL0 and MDL1,
the LED at the matrix cross point is lighted up.
+5V1
DTB113ZS
MDL0 MDL1
Q1 Q2
2m sec
MDL0
MDL1
FO
RDL1-ON

5. Power section

Each AC voltage generated by the power transformer in the AC PWB
unit is full-wave rectified and smoothed to stabilize each voltage (UH,
UB, VD) in the main PWB side, and is supplied to loads.
(1) Signal name and output voltage
GND: 0V
+30 ∼ 44V (Separated into 24V and 32V supply in the main
VH:
PWB.)
+24V ∼ 35V (Forms 5V supply in the main PWB.)
VD:
FW: Full-wave rectification
FW
•
AC PWB unit
L2
N1
RDL1
PEL
F1
Q4
LC7935
Cycle 4 msec 1/2 duty
GND
GND
GND
PEL-ON
10~14V
POWER TRANS
CNA-3
F503
CNA-1
F504
CNB-5
+
RBV-608
BD501
CNB-6
~ ~
_
F505
CNB-1
+
S1NB60
BD502
CNB-2
~ ~
_
CNB-3
+
S1ZB60
BD503
CNB-4
~ ~
_
12 – 13
CNE-1
CNE-2
C509
R508
CNE-3
6800uF 50V
24KJ
CNE-4
CNE-7
C510
2200uF 25V
CNE-8
CNE-5
CNE-6
VH
VH
GND(VH)
GND(VH)
VD
GND(VD)
FW
GND(FW)