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3.3.
SMPS Circuit (SA-PT770P/PC & SA-PT770P9/PC9)
With reference to original service manual (section 17.6) on page 127 for model no. SA-PT770P/PC-K
With reference to SA-PT770P/PC-K (section 17.6) on page 127 for model no. SA-PT770P9/PC9-K
1
2
3
SCHEMATIC DIAGRAM - 14
A
H
SMPS CIRCUIT
CN2016
F+
1
F-
2
-VP
3
GND
4
B
TO
GND
5
MAIN CIRCUIT
B
5.3V
6
(H2901*)
5.3V
7
IN SCHEMATIC
MOTOR_+9V
8
DIAGRAM - 9
TUNER_+9V
9
MGND
10
+18V
11
SYS5VGND
12
SYS5V
13
SYNC
14
Q2901
2SB0621AHA
-7V REGULATOR
C
Q2902
B1ADCF000001
POWER CONTROL
D
E
Q2903
2SC3940ARA
+7V REGULATOR
CN2017
F
+7V
1
B
AGND
2
TO
AGND
3
MAIN CIRCUIT
-7V
4
(H2900*)
DC_DET2
5
IN SCHEMATIC
R2010
1K
PCONT
6
DIAGRAM - 9
ECO_CTL
7
NC
8
G
H
1
2
3
4
5
6
: +B SIGNAL LINE
: -B SIGNAL LINE
R2910
1.5
R2935
IC2903
4.7K
C0DAAMH00012
1M
R2911
C0DAAYH00001
1K
SWITCHING REGULATOR
5
4
3
2
1
L2902
G0A101ZA0028
+5.3V
R2921
R2920
3.9K
390
G0A200D00002
C2931
0.47
AGND
ADD
IC2900
C0DAAYY00042
3
2
1
C0DAAYG00001
SWITCHING REGULATOR
E2900
CHANGE
5
4
3
2
1
MOT_+9V
L2903
G0A101ZA0028
+9V
C2932
0.1 0.47
R2923
R2906
1.2K
6.8K
D2913
B0JCPD000025
R5864
15K
4
5
6
7
8
9
+9V
F+
F-
-VP
+5.3V
D2909
MAZ82400HL
B0EAMM000057
+9V
MGND
DC_18V
SYS_GND
L2914
J0JBC0000041
-VP
SYS5V
SYNC
D2903
B0EAMM000057
MGND
L2915
-13V
J0JBC0000041
+5.3V
F-
CHANGE
L2916
D2906
J0JBC0000041
B0JAME000029
F+
+18V.-12V_GND
FB
VCC
FAN GND
VDD
L2911
R2902
0
+18V
DC_18V
SYNC
Q5898
B1ABCF000176
INVERTER
R5886
100
CHANGE
R2930
4.7K
1M
ECO_CTL
R5865
4.7K
VSS
Q5863
B1ABCF000176
ECO CONTROL
+18V.-12V_GND
SYS5V
DCDET
C
1
PCONT
ECO_CTL
3
A
2
R
IC5899
C0DAEMZ00001
SHUNT REGULATOR
SYS_GND
7
8
9
11
10
11
12
CHANGE
G0C390JA0055
R2900
D2908
5.6K
4.7K
T2900
G4D1A0000117
SWITCHING TRANSFORMER
4
Q2900
5
3
B1BABK000001
PSAVE CONTROL
6
2
7
1
8
9
C2902
R2902
47
5600P
PC5720
B3PBA0000402
R5809
R5807
FEED BACK
R5730
1K
330
330
1
4
PC5702
R5802
2
3
B3PBA0000402
4.7K
SYNC SWITCH
D5725
MAZ80620ML
4
1
3
2
R5803
C
0
1
IC5801
R5806
15K
C0DABFC00002
3
R5804
C5818
A
SHUNT REGULATOR
150K
0.1
2
R
R5805
PC5799
6.8K
B3PBA0000402
FEED BACK
R5894
330
1
4
R5829
R5817
22
2.2K
2
3
R5818
100
T5751
C5820
ETS19AB2A6AG
6.3V2200
BACKUP TRANSFORMER
R5798
D5798
22
B0EAMM000057
6
D5896
C5798
B0EAMM000057
50V22
7
5
8
4
3
9
R5786
200K
10
2
C5790
2200P
1
D5793
B0HAMP000094
C5705
F1BAF1020020
1000P
1/2
2/2
SA-PT770P/PC
10
11
12
13
14
P1
FP2901
L2910
1A
1
2
TO SMPS
SECTION (2/2)
1
2
D5730
MA2YF8000L
IC5799
MIP2F20MSSCF
SWITCHING REGULATOR
5
D
VCC
4
TR
3
7
S
FB
2
8
S
VDD
1
R5797
15K
4
5
SMPS
CIRCUIT
13
14
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