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3.5.
SMPS Circuit (SA-AKX74PH/PN-K)
With reference to original service manual (section 16.9) on pages 104 & 105.
1
2
3
SCHEMATIC DIAGRAM - 22
A
M
SMPS CIRCUIT
CN5801
L
+35V_SENSE
6
TO
+35V_SENSE
5
D-AMP CIRCUIT
SYS_GND
4
(ZJ5901*)
SYS_GND
3
IN SCHEMATIC
-35V_SENSE
2
DIAGRAM - 21
B
-35V_SENSE
1
R5701
100K...PH
CN5802
2.2K...PN
SMPS_ID
15
PCONT
PCONT
14
PW_DC+16V
DC16V
13
C
+16V_GND
12
ECO_CTL
ECO_CTL
11
B
TO
DCDET2
10
TEMP_DET
MAIN(MICON)
TEMP_DET
9
PW_SYS3.3V
CIRCUIT (CN2007)
SYS3.3V
8
SYNC
IN SCHEMATIC
SYNC
7
DIAGRAM - 7
+35V_SENSE
6
+35V_SENSE
5
C5831
C5896
OUTP_GND
4
0.1
0.1
OUTP_GND
3
C5832
-35V_SENSE
2
0.1
-35V_SENSE
1
D
TH5861
D4CCY1040001
E
TEMP_DET
C5900
10
F
R5898
10K
G
NOTE: " * " REF IS FOR INDICATION ONLY
H
1
2
3
4
5
6
: +B SIGNAL LINE
: -B SIGNAL LINE
Q5862
R5862
R5863
B1GBCFJJ0051
18K
18K
DC DETECT
R5860
R5861
10K
1.8K
Q5860
Q5861
B1ADCF000001
B1ABCF000176
C5869
R5864
TEMPERATURE DETECT
TEMPERATURE DETECT
0.1
10K
C5870
0.1
R5800
R5841
R5836
15K
120K
2.2K
R5840
C5843
R5837
82K
10
2.2K
R5801
C5844
22K
10
QR5801
B1GBCFJN0038
D5804
QR5802
B0ACCK000012
SWITCH
B1GDCFGA0018
DA2J10100L
DC DETECT
PW_DC+16V
CHANGE
(D5804)
C5826
C5800
0.01
0.01
CHASSIS GND
C5817
100V0.1
R5814
8.2K
Q5899
R5866
22
QR5812
B1ABGC000001
B1GDCFJJ0047
SHUNT REGULATOR
R5805
CONTROL
SWITCH
3.3K
R5868
22K
R5867
C5871
C5872
R5865
100K
0.01
6.3V2200
390
PW_SYS3.3V
QR5811
ECO_CTL
B1GBCFJJ0051
SWITCH
PCONT
4
5
6
7
8
9
D5801
B0ABSM000008
TH5860
D4CCY1040001
T5701
1
2
3
G4DYZ0000051...PH
G4DYZ0000060...PN
MAIN TRANSFORMER
10
9
C5805
11
8
R5833
R5832
50V2200
2.2K
2.2K
12
7
13
6
C5808
R5835
R5834
50V2200
2.2K
2.2K
14
5
15
4
HEATSINK*
16
3
3
2
1
R5720
22
G1
G2
17
2
18
1
D5802
D5803
B0HFRJ000012
B0ABSM000008
C5813
C5812
25V220
0.1
PC5720
B3PBA0000579
FEEDBACK
R5809
R5807
330
330
1
4
R5808
2.2K
R5802
C5810
2
3
10K
0.1
IC5801
R5803
C0DAZYY00039
10K
SHUNT REGULATOR
R5804
82K
K
B0BC019A0007
R5806
DZ2J200M0L
15K
A
C5818
B0ACCK000012
0.1
DA2J10100L
R
PC5701
B3PBA0000579
FEEDBACK
1
4
R5817
R5810
330
330
2
3
QR5810
B1GBCFLL0037
PCONT SWITCH
7
8
9
11
10
11
12
FOR PH
FOR PN
10
9
10
9
-37V
-37V
11
8
11
8
12
7
12
7
GND
GND
13
6
13
6
14
5
14
5
+37V
+37V
VIN
15
4
15
4
VIN
VIN
GND
GND
16
3
16
3
VCC
VCC
17
2
17
2
+16.8V
+16.8V
18
1
18
1
GND
GND
R5702
R5703
C5713
100K...PH
100K...PH
0.01
33K...PN
33K...PN
HEATSINK*
3
D5702
B0ZAZ0000089
G1
G2
1
2
R5724
D5726
120
B0EAKM000117
R5723
1K
D5721
B0BC010A0007...PH
DZ2J110M0L...PH
L5704
B0BC01700015...PN
J0JBC0000019
Q5720
B1BABG000007
D5729
VOLTAGE REGULATOR
B0EAMM000057
Q5722
D5727
R5722
B0ACCK000012
B1ABCF000176
1.2K
DA2J10100L
R5721
CURRENT
10K
LIMITING SWITCH
D5724
B0ACCK000012
D5728
DA2J10100L
B0ACCK000012
C5725
C5720
DA2J10100L
0.1
0.1
R5730
C5728
1K
1000P
D5722
C5721
C5722
220P
1000P
D5723
D5725
C5737...PH
B0BC6R100010
820P
DZ2J062M0L
2200P
CHANGE
(C5737,D5721...PH,D5722,D5723,
1/2
2/2
SA-AKX74PH/PN SMPS CIRCUIT
D5724,D5725,D5727,D5728,D5732)
10
11
12
13
14
P1
1
TO SMPS
CIRCUIT (2/2)
2
3
R5732
100
IC5701
C5HACYY00004...PN
C5HACYY00005...PH
SWITCHING REGULATOR
7
OCP/BD
6
FB
C5723
5
OLP/SS
470P
C5730
1
4
VCC
C5726
0.1
3
GND
R5733
47K
2
S
1
D
4
C5727...PN
R5726
3300P
0.1
R5727
0.1
FOR PN
13
14
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