3-1. POWER CIRCUIT
1. OUT LINE
The part that supply DC VOLTAGE to each circuit change AC input voltage into DC voltage. It is based on SMPS(switching
mode power supply)system which is located on main pcb. SMPS module is composed of the switching circuit and the
transformer of the primary part and the rectifier circuit of the secondary part.
2. NAME AND OPERATION OF PINS ON SMPS MODULE
1)primary part
2)secondary part
3. START UP AND NORMAL STATUS
The system of capacitor start-up is applied to DC part. As short circuit status is completed, Ib of(R803+R804/R805). Vin DC
which flows is Q801 BASE turn on Q801. The collector current, generated after Q801 trurn on, keeps the energy
W=1/2LpI*I*Ton in NP winding.
Input DC voltage is connected to both ends of NP winding.
Nb winding, m which is winded the same as NP has voltage(Vnb=NB/NP*VinDC)and if supplies Q801with Ib through
R809,R808,807,C810 and D803 Capacitor C810 is used for speed-up of D803 which rectifies and supplies only positive
voltage left on Nb winding, to the base of Q801. At the same time C813 is charged through R810 and DZ801.
10
SECTION 3.
CIRCUIT OPERATION PRINCIPLES
PIN NO
NAME
FUNCTION
1
AC INPUT
SUPPLY AC INPUT VOLTAGE
2
PIN NO
NAME
FUNCTION
1
+38V
TUNING VOLTAGE OF
TUNER(33V)
2
(F+4.5V)
F/L DISPLAY FILAMENT
VOLTAGE SUPPLY
3
(F-4.5V)
F/L DISPLAY FILAMENT
VOLTAGE SUPPLY
4
-28V
F/L DISPLAY DRIVE VOLTAGE
SUPPLY
5
GND
SECONDARY GND
6
GND
SECONDARY GND
7
GND
SECONDARY GND
8
5.8V
EVER 5V, ON/OFF 5V
9
12.7V
CAP MOT, DRUM MOT(12V)
LOADING MOT(12V)
Содержание DV-K882SY-AN
Страница 68: ...SECTION 8 CIRCUIT DIAGRAM 8 1 CONNECTION DIAGRAM 66 ...
Страница 69: ...8 2 POWER CIRCUIT 67 ...
Страница 70: ...8 3 LOGIC CIRCUIT 68 ...
Страница 71: ...8 4 MAIN CIRCUIT 69 ...
Страница 72: ...8 5 VIDEO CIRCUIT 70 ...
Страница 73: ...8 6 HEAD AMP CIRCUIT 71 ...
Страница 74: ...8 7 SECAM CIRCUIT 72 ...
Страница 75: ...8 8 Hi Fi AUDIO CIRCUIT 73 ...
Страница 76: ...8 9 PIF CIRCUIT 74 ...
Страница 77: ...8 10 IF MODULE CIRCUIT 75 ...
Страница 78: ...8 11 A V SCART CIRCUIT 76 ...
Страница 79: ...8 12 OSD CIRCUIT PDC CIRCUIT 77 ...
Страница 80: ...8 13 REMOCON CIRCUIT 78 ...