Dell 2209WA Service Manual page 18

Service Manual
R930 C930
100R 3W 1nF/1KV
D930 5A/150V
T900
SPW-129 PQ2620
D931 5A/150V
. + C931
1 7 470u/35V
C960 R960
3 2200p/100V 10R 2W
9
8 D960
1
2
3
12
5 11 SRF10-100CT
10 D961 C962
.
1
6 2 330uF/16V
.
3 OS-CON SEP
SRF10-100CT C961
10nF/50V
C860
2200p/400V
R964
330 1%
I950 C969
4 1
0.1/50V
R968
3 2 2K2 1%
R965 C968
LTV817M
10K 0.047/50V
I951
TL431
○ A
D853 and D854 is used to rectify the inducted current. R856 and C858
form the snubber circuit for restrain peak voltage of Schottky Diode D853 and
D854.The parts including C861, C862,C863,C864,C865,R865, and
L853,L860 are used to smooth the current waves that are from D853 and
D854, then 24V voltage is supplied.
DC 24V supply voltage feed back to PWM controller U850 via, R878,
R860,C871, I851,R864,C872,
R863R859, Used to control the voltage feedback loop.
○ B
D930 & D931 is used to rectify the inducted current. R930 and C930 are
used to store energy when current is reversed. The parts including C931,
C932 , Q930,C933 and L930 are used to smooth the current waves that are
from D930 & D931, then 12V voltage is supplied.
DC 12V supply voltage feed back to PWM controller U950 via, R938,
R937, C935, I930, R939,
And Q930 Parts, Used to control the voltage feedback loop.
D960 & D961is a Schottky diode used to rectify the inducted current.C960
and R961 form the snubber circuit for restrain peak voltage of Schottky Diode
L953
CHK-077/2.2uH +5V_PI HIGH ON
7 Audio_on_of f
Audio_on_off
C964
C963
330uF/16V 470uF/25V
OS-CON SEP
R963
10.5K 1%
+5V_PI OPTION
R976
22K 1%
R978
Q960 10K 1%
RK7002
1
PWR_sav e 5
R962
10K 1% C978 R977 C977
(18K/Power 1nF/50V 100K 1% 1nF/50V
Saving)
Fig.7
17
Q930
AP9972
4 3
R936
+24V Q931
10K
R931 PMBT2907A ZD930
2 3 GDZ20B 20V
1K
1/4W
R932 1N4148
20K 1%
0402
R933
10K
R937
10K
I930
R935
1 Q932 TL431
10K 0402 MMBT4401
R934
C936
1000p/50V 1M
0402 0402
+5V_PI +24V_DC
R971 R972
OVP
200 1% 200 1%
ZD971 ZD972
GDZ5.6B GDZ30A
Q971
SFOR3G42
R970 C891
1K 1% 0.01/25V
○ B
+12V
F853
5A/125V
+ C932
470u/25V R938 L930
39.2K + C933
0402 470u/25V
D932
NC/CHK-091
C935
1nF/50V X7R
R939
10K
0402
+12V
R973
200 1%
ZD973
GDZ16A
CN853
BNC-2
1
2