Read Harman Kardon HD 990 (serv.man7) Service Manual online
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
Function describe:
1. IR signal receive and transmit.
2. Detect functional button and transmit.
3. control power indicator.
4. control SMPS board go to standby.
5. control mute signal when power on
and power off.
1. IR signal receive and transmit.
2. Detect functional button and transmit.
3. control power indicator.
4. control SMPS board go to standby.
5. control mute signal when power on
and power off.
unmute
mute
PIN7 logic:
amber
amber
blue
unmute
blue
mute
PIN9 logic:
AMBER
WHITE
5575C
1.2
HD980 FRONT PANEL: Button board
A4
1
2
Friday, August 01, 2008
Title
Size
Document Number
Rev
Date:
Sheet
of
STANDBY
RB7
VPP
RB6
RB4
RA0
RB5
REMOTE_IR
IR
RA1
STANDBY
IR
5VON
RA1
REMOTE_IR
RB5
DGND
DGND
5VON
5VON
5VON
5VON
DGND
DGND
DGND
DGND
DGND
DGND
5VON
+
CE402
100uF/10V
100uF/10V
1
2
C402
22pF
22pF
CN403
CON6_1.25MM_DIP_B
CON6_1.25MM_DIP_B
1
2
3
4
5
6
R401
15K
K405
Prev
Prev
1
3
3
2
4
4
K403
Pause
Pause
1
3
3
2
4
4
C406
100nF
R411
4.7K
R408
4.7K
4.7K
K402
Play
Play
1
3
3
2
4
4
R415
0R
0R
K406
Next
Next
1
3
3
2
4
4
C401
2.2uF
Y401
4.000MHZ
4.000MHZ
1
2
3
IR G VCC
IR401
HS0038B
HS0038B
1
2
3
K407
Display
Display
1
3
3
2
4
4
LED401
1
2
3
C403
22pF
22pF
R412
200R
200R
CN404
CON3_2.54MM_DIP
CON3_2.54MM_DIP
1
2
3
1
2
3
C405
100nF
R410
4.7K
VR1
NA
NA
1
2
3
R402
4.
7K
K401
Standby
Standby
1
3
3
2
4
4
+
CE401
100uF/10V
100uF/10V
1
2
VR2
NA
NA
1
2
3
R414
0R
0R
D401
LL414
8
1
2
U401
EM78P156ELM
EM78P156ELM
1
2
3
4
5
6
7
8
9
2
3
4
5
6
7
8
9
17
18
10
11
12
13
14
15
16
P52
P53
TCC
RESET
VSS
P60/INT
P61
P62
P63
P53
TCC
RESET
VSS
P60/INT
P61
P62
P63
P50
P51
P64
P65
P66
P67
VDD
OSCO
OSCI
R404
470R
B
C
E
Q402
8050
8050
1
3
2
K404
Stop
Stop
1
3
3
2
4
4
R407
4.7K
4.7K
R406
4.7K
R413
1K
1K
B
C
E
Q401
8550
8550
2
3
1
R403
4.
7K
R409
4.7K
C404
100nF
100nF
harman/kardon
HD 990/230 Service Manual
Page 44 of 46
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