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5
harman/kardon
E
+5V
+5VA
FB11
FB12
100R
100R
D
CE59
CE60
2
1
1
2
100uF/10V
100uF/10V
C9
C10
100nF
100nF
23
22
RST_1955#
RST
MUTE
2
18
DAC_LRCLK
LRCLK/EF_WCLK
OUT L+
3
17
DAC_BITCLK
BCLK/EF_BCLK
OUT L-
4
21
DAC_SDATA_L
SDATA/EF_LDATA
ZERO_L
5
DAC_SDATA_R
EF_RDATA
11
OUT R+
27
12
DAC_MCLK_2
MCK
OUT R-
20
ZERO_R
6
+5V
DSD_SCLK
7
13
DSD_LDATA
FILTR
8
DSD_RDATA
9
14
DSD_PHASE
IREF
25
16
CS_1955_2#
CLATCH
FILTB
26
SCK
CCLK
C
24
MOSI
CDATA
U3
AD1955
B
A
5
4
I/V conversion
C2
+12VA
100nF
+12VA
R5
820R
1%
U1A
OP275GS
3
+
1
2
-
C6
100nF
C183
-12VA
3.3nF
R17
47K
1%
MUTE_1955
CE3
1
2
47uF/25V
C14
100nF
R21
2K7
1%
C15
Servo DC
100nF
CE4
1
2
47uF/25V
+12VA
+12VA
R26
820R
1%
U1B
OP275GS
5
+
7
6
-
C184
-12VA
3.3nF
R38
47K
1%
Servo DC
4
3
+12VA
Q1
2SA1035
CE1
47uF/25V
1
2
C1
R6
C174
100nF
R8
2K2
680pF
2K7
1%
U2A
1%
OP2134UA
3
+
1
2
-
R9
R11
100R
2K7
R15
C168
1%
1%
2K2
680pF
1%
C8
100nF
2
1
+12VA
C11
CE2
100nF
47uF/25V
Q7
2SC2406
U4A
TL072
3
+
1
2
-
C173
C13
R20
-12VA
100nF
100nF
47K
1%
+12VA
-12VA
Q9
2SA1035
CE5
47uF/25V
1
2
C16
R27
C171
100nF
R29
2K2
680pF
2K7
1%
U2B
1%
OP2134UA
5
+
7
6
-
R30
R32
100R
2K7
R36
C169
1%
1%
2K2
680pF
1%
C21
100nF
2
1
+12VA
CE6
47uF/25V
Q15
U4B
2SC2406
TL072
5
+
7
6
-
R41
C167
47K
-12VA
100nF
1%
-12VA
3
2
Differential output stage
R1
R2
330R
330R
1%
1%
Q2
1
1
2SA1035
UNBAL_L
Q3
1
2SC2406
R3
R4
15K
680R
1%
1%
R7
Q4
330R
R10
1
2SA1035
1%
56R
1%
R13
C172
330R
2.2nF
1
1%
Q5
2SC2406
R16
680R
1%
Q6
1
2SA1035
Q8
1
1
2SC2406
R18
R19
330R
330R
1%
1%
Differential output stage
R22
R23
330R
330R
1%
1%
Q10
1
1
2SA1035
Q11
1
2SC2406
R24
R25
15K
680R
1%
1%
R28
Q12
330R
R31
1
2SA1035
1%
56R
1%
R34
C170
330R
2.2nF
1
1%
Q13
2SC2406
R37
680R
1%
Q14
1
2SA1035
Q16
1
1
2SC2406
R39
R40
330R
330R
1%
1%
Harman/Kardon
Title
Size
Custom
Date:
2
1
HD 990/230 Service Manual
JP1
E
3
3
1
1
2
2
AV2-8.4-1G
JP2
XLR male
2
1
R14
47K
1%
K1A
D
RELAY JRC-19F
C
R35
47K
1%
B
K1B
RELAY JRC-19F
A
HD 990 Main board
Document Number
Rev
5604C
1.5
Tuesday, October 07, 2008
Sheet
2
10
1
Page 35 of 46
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