Read Harman Kardon FL 8550 (serv.man13) Service Manual online
Pin Definitions
Pin Number
Pin Name
I/O
Pin Function Description
1
DO1.1
O
Drive output
2
DO1.2
O
Drive output
3
DI1.1
I
Drive input
4
DI1.2
I
Drive input
5
REG
-
Regulator
6
REO
O
Regulator output
7
MUTE
I
Mut e
8
GND1
-
Ground 1
9
DI2.1
I
Drive input
10
DI2.2
I
Drive input
11
DO2.1
O
Drive output
12
DO2.2
O
Drive output
13
GND2
-
Ground 2
14
OPOUT
O
Op-amp output
15
OPIN(
−
)
I
Op-amp input (
−
)
16
OPIN(+)
I
Op-amp input (+)
17
DO3.1
O
Drive output
18
DO3.2
O
Drive output
19
DI3.1
I
Drive input
20
DI3.2
I
Drive input
21
V
CC1
-
Supply voltage
22
V
CC2
-
Supply voltage
23
VREF
I
2.5V bias voltage
24
DI4.1
I
Drive input
25
DI4.2
I
Drive input
26
DO4.1
O
Drive output
27
DO4.2
O
Drive output
28
GND3
-
Ground 3
FL8550
23
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