Kurzweil PC2 Series, Service Manual

Page: 114 / 126

Kurzweil PC2 Series Service Manual
7-12
Connector Board (keyboard models)–Power Supply/Audio (page 3 of 3)
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
A
B
C
D
A
B
C
D
+
C30
1000uF, 25V
1
2
3
+
C31
470uF, 25V 12
3
GJ1
JUMPER
2
1
J321
PC88II PWR
1 5 4
2 3
S2
5
6
3
2
4
1
D17
S1A
1
2
D15
S1A
1 2
D14
S1A
1 2
J302
PC88II AUDIO OUT
2
LOUT~
4
ROUT+
5
ROUT~
3
AGND
1
LOUT+
VR2
78M12
2
GND
1
IN
3
OUT
VR1
78T05
2
GND
1
IN
3
OUT
+
-
U4 LM339
11
10
3
12
13
J301
PC88 II POWER
5
+12V
3
-12V
2
5V_DIG
6
MUTE
8
PWRUPRST
4
AGND
7
BUVdd
1
DGND
L3
FB2.5TSMT
1 2
L4
FB2.5TSMT
1 2
U5
74HCU04
5 6
C41
0.1uF
1
2
C42
0.1uF
1
2
C24
0.1uF
1
2
C23
0.1uF
1
2
C48
0.1uF
1
2
VR3
79L12ACM
5
GND
2
I1
3
I2
6
I3
7
I4
1
OUT
C33
0.1uF
1
2
C32
0.1uF
1
2
C26
1000PF
1
2
C27
1000PF
1
2
C38
0.1uF
1
2
C35
0.1uF
1
2
C44
0.1uF
1
2
C39
0.22uF
1
2
C29
0.1uF
1
2
C54
0.1uF
1
2
C53
0.1uF
1
2
C52
0.1uF
1
2
C51
0.1uF
1
2
C50
0.1uF
1
2
C55
100pF
1 2
C46
100pF
1 2
C43
DNS
1 2
+
C36
100uF 16V
1
2
+
C37
100uF 16V
12
+
C40
1000uF 16V
1
2
+
C34
100uF 16V
1
2
+
C28
100UF 16V
1
2
Q15
KSC2331
B
C
E
Q14
KSC2331
B
C
E
Q7
MMBT2222
B
C
E
Q9
MMBT2222
B
C
E
+
-
U9
NE5532
3
2
8
4
1
+
-
U3
TL072
5
6
8
4
7
D21
LL4148
1
2
D22
S1A
12
R118
1.6K
1
2
R19
5.6K
1
2
R18
470
1
2
R117
470
1
2
R122
15.0K 1%
1
2
R8
5.6K
1
2
R119
1M
1
2
R129
3K
1
2
R127
3K
1
2
R150
100K
1
2
R149
10K
1
2
R146
10K
1
2
R151
DNS
1
2
R128
220
1
2
R120
1K
1
2
R126
220
1
2
R123
15.0K 1%
1
2
R139
200 1% 1/3W
1 2
R141
200 1% 1/3W
1 2
R130
200 1% 1/3W
1 2
R124
200 1% 1/3W
1 2
R133
15.0K 1%
1 2
R134
47
1 2
R142
15.0K 1%
1 2
R132
15.0K 1%
1 2
R15
100K
1
2
R121
10K
1 2
R137
47
1 2
R138
15.0K 1%
1 2
R135
15.0K 1%
1 2
R136
15.0K 1%
1 2
Q4
MMBT2907
C
B
E
Q12
MMBT2907
C
B
E
Q13
MMBT2907
C
B
E
Q8
MMBT2907
C
B
E
J312
JACK
1
6
2
5
3
4
J311
JACK
1
6
2
5
3
4
J310
JACK
1
6
2
5
3
4
R7
100K
1 2
R92
DNS
1 2
R145
200K
1 2
+
-
U9
NE5532
5
6
7
YOUNG CHANG CO., LTD.
of Young Chang Co., Ltd. is prohibited.
Reproduction without the express written consent
Filename:
Doc:
Mfg:
Eng:
Sht
By:
Date:
of
Rev:
PC88 II CONNECTOR PCB
POWER SUPPLY/AUDIO
DMH
021221-000 C V4
021221C4 9/29/00
3 3
+12V
+17V
PWRUPRST {1-A8}
VCC
+12V
~17V
~12V
+9V VCC
~12V
+12V
+9V VCC +9V
VCC +12V
~12V
RESET {1-A1}
BUVdd
VCC
+12V
MONOSENS {1-C1}
VCC
~12V
~12V
Switch is in ON Position
GJ1 connects directly to C28.2 in a star ground pattern
RIGHT
LEFT/MONO
HEADPHONES
ONE EACH AT GROUND PINS OF U1, U2, U5, U7, U11