Service Manual
17
Q932
MMBT4401
1
3
2
(18K/Power
Saving)
C969
0.1/50V
+
C933
470u/25V
HIGH ON
0402
R963
10.5K 1%
Audio_on_of f
7
L930
NC/CHK-091
4
1
3
2
0402
Audio_on_off
I951
TL431
I930
TL431
+5V_PI
C961
10nF/50V
F853
5A/125V
ZD971
GDZ5.6B
R968
2K2 1%
PWR_sav e 5
R970
1K 1%
R938
39.2K
R973
200 1%
0402
R934
1M
R936
10K
R931
1K
C930
1nF/1KV
+12V
C960
2200p/100V
0402
ZD973
GDZ16A
0402
R962
10K 1%
R977
100K 1%
Q960
RK7002
1
3
2
D960
SRF10-100CT
1
2
3
C977
1nF/50V
R930
100R 3W
C936
1000p/50V
+24V_DC
0402
R976
22K 1%
C978
1nF/50V
Q930
AP9972
1
4
3
Q931
PMBT2907A
3
1
2
.
.
.
T900
SPW-129 PQ2620
5
10
6
7
3
1
8
9
12
11
D932
1N4148
C968
0.047/50V
C935
1nF/50V X7R
I950
LTV817M
3
1
4
2
OPTION
C962
330uF/16V
L953
CHK-077/2.2uH
R972
200 1%
OS-CON SEP
OVP
+24V
C860
2200p/400V
R933
10K
D931 5A/150V
R932
20K 1%
R964
330 1%
OS-CON SEP
+
C931
470u/35V
+5V_PI
C964
470uF/25V
R965
10K
R937
10K
R978
10K 1%
Q971
SFOR3G42
CN853
BNC-2
2
3
1
1/4W
+5V_PI
C891
0.01/25V
ZD972
GDZ30A
C963
330uF/16V
D930 5A/150V
ZD930
GDZ20B 20V
+12V
D961
SRF10-100CT
1
2
3
R939
10K
R960
10R 2W
+
C932
470u/25V
R935
10K
R971
200 1%
○
B
Fig.7
○
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
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