Changhong Electric PT4216, Service Manual, Page: 27 / 62

27
X P 9 0 5
1 t h p i n
U 9 1 5
T A 4 8 0 5 F
U 3 0 9 （ 1 6 t h p i n ) , U 3 0 5 （ 1 8 t h , 2 2 t h ,
2 6 t h p i n
）
, U 3 0 7
（
1 6 t h p i n ) , U 3 0 6
（
1 6 t h p i n
）
a n d e a c h p o r t a u d i o i n p u t
c i r c u i t b i a s s u p p l y
U 3 0 8 （ 1 6 t h p i n ) , U 3 1 1 （ 1 4 t h p i n ) , X P 9 0 0
（ 7 t h 、 8 t h p i n ） a n d G P I O p o r t p u l l - u p
p o w e r s u p p l y
+ 5 V
+ 5 _ A N G
4.1.5
、
A12V power branch
XP900
5th pin
SCOL, SCOR audio
output circuit power
supply
U5 TDA9178T
20th pin
+12V_DC
+12V_3A
PDP_D12V
U916
TA4808F
4.2
The Pin Voltage of regulator on Main Board
position type PIN1(V) PIN2(V) PIN3(V) PIN4(V) PIN5(V)
UP7 LM1117-1.8V 0 1.8 5 1.8
UP1 LM1117-3.3V 0 3.3 5 3.3
U913 4805F 6 0 5
U923 4805F 6 0 5
U916 78M08 12 0 8
U403 LM1117-1.8V 0 1.8 3.3 1.8
U915 4805F 6 0 5 0
U903 LM1117-2.5 0 2.5 5 2.5
U914 LM1117-1.8V 0 1.8 3.3 1.8
U900 LM1117-3.3V 0 3.3 5 3.3
4.3 Main Components and Socket Locations and Definitions on main board module: