Power Section - Sharp SF-2014 Service Manual

(3) LED display
The lED is lighted up by the signal matrix of MDL0 (Q1)
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 trans 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
VH: +30 44V (Separated into 24V and 32V supply in the main
PWB.)
VD: +24V 35V (Forms 5V supply in the main PWB.)
FW: Full-wave rectification
FW
•
AC PWB unit
L2
N1
MDL1 (Q2)
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
C509
R508
6800uF 50V
24KJ
C510
2200uF 25V
CNE-1
VH
CNE-2
VH
CNE-3
GND(VH)
CNE-4
GND(VH)
CNE-7
VD
CNE-8
GND(VD)
CNE-5
FW
CNE-6
GND(FW)