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5
DISPLAY/L-PSHBTN/R-PSHBTN/HDPHN/L-MTR/R-MTR
6
7
8
9 10
HP DET
J1:23
HP DET
2
AD REF
J1:22
2
AD REF
VF D CL
J1:16
VFD CL
2
VF D DA
5
J1:18
2
VFD DA
DISPLAY
VF D CS
J1:17
VFD CS
2
I2C CL 1
J1:20
2
I2C CL 1
I2C DA 1
J1:19
2
I2C DA 1
VOL A
J1:10
VOL A
2
VOL B
J1:9
VOL B
2
INP B
J1:11
INP B
2
INP A
J1:12
INP A
2
PB DET
J1:21
PB DET
2
GND
J1:5 J1:6
2
J1:7 J1:8
+5VD
J1:3
2
+5 V D
J1:4
+3. 3VBU
J1:1
2
+3 .3V BU
J1:2
FR IR
J1:15
FR IR
2
PW R
J1:13
PWR
2
FP RST
J1:14
2
FP RST
43
GP1
6-32
INP UT
4
S1
V OLUME
5
S2
+5 V D
+3 .3V BU
IR1
OUT
Vs
GND
6
R4
22.1
7
U3:2
5
3. 3V
NO HDPH JACK
1. 65V
NO HDPH PLU GGED IN
0V
HDPH PLU GGED IN
6
TRIM
7
R5
22.1
+5 V D
+5 K B
TRIM
OUT 1
OUT 2
TONE
M UTE
NO PUSH
0V
0. 67V
1. 36V
1. 94V
2. 62V
+5 K B
2
R6
22.1
B+
1
U3:1
B-
3
+3 .3V BU
+3 .3V BU
U4
1
Vcc
4
2
GND
+3 .3V BU
R7
U2
475k
1
Vc c
4
2
GN D
R8
D1
150
+3 .3V BU
751900 SCH 2 of 2
GP4
GP2
4-40
4-40
GP3
GP5
4-40
4-40
HDPH
J7:7
J21:1
R
R
J21:2
J7:8
J21:7
L
L
J21:8
GN D
J21:3
J21:5
J7:3
J21:4
J21:6
J7:4 J7:5
J18:1
R HDPH
R HDPH
11
J18:2
GND
11
J18:3
GND
11
J18:8
NC
11
J18:4
L HDPH
L HDPH
11
J18:7
NC
11
J18:9
R M ET
R MET
11
J18:6
NC
11
J18:10
GND
11
J18:5
NC
11
J18:11
GND
11
J18:12
L M ET
L MET
11
3. 3V
R11
1.21k
J3:1
OUT 1
6
5
TRIM
R12
3.32k
J3:8
OUT 2
6
5
J3:3
J3:4
6
5
J3:5
J3:6
R13
6.81k
J4:1
TON E
7
5
R14
18.2k
J4:8
M UTE
7
5
J4:7
STBY
7
5
J4:3
J4:4
7
5
J4:5
J4:6
44
9
8
J8
7
Ring-R
3
2
4
Tip-L
5
6
1
8
J7:1
HEADPHONE
J7:2
J7:6
J19:1
L M ET
1
GND
J19:2
1
R M ET
J20:1
1
GND
J20:2
1
OUTPUT 1
J5:8
S3
OUTPUT 2
6
J5:1
S4
L PUSHBUTTON
J5:3
J5:4
J5:5
J5:6
TON E
J6:8
S5
M UTE
J6:1
S6
STANDBY/ ON
J6:2
S7
J6:3
7
J6:4
J6:5
J6:6
R PUSHBUTTON
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