Onkyo DX-7555, Service Manual

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DX-7555
IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-1
Q2002 : BA5947FP (4-ch BTL DRIVER)
LEVEL
SHIFT
D
D
D
F R
R
F
R
F
R F
R F
F
INTER
FACE
INTER
FACE
19k
6.5k
50k 50k
50k
100k
50k
PIN3
10k
Pre
Vcc
50k
Vref
Vref
POW
VCC
POW
VCC
50k 50k
POW
VCC
PIN26
10k
15
16
17
18
19
20
21
22
23
24
25
26
27
28 1
2
3
4
5
6
7
8
9
10
11
12
13
14
D
D
D
D
D
(ch1, 2)
POW
VCC
(ch3, 4)
SW
INTER
FACE
MUTE
THERMAL
SHUTDOWN
100k
No. PIN NAME DESCRIPTION
15
16
17
18
19
20
21
22
23
24
25
26
27
28
CH4OUTR
CH4OUTF
CH3OUTF
CH3OUTR
POWVCC
MUTE
GND
CH3RIN
CH3FIN
CH4IN
CH4CAPA
OUTVREF
OPOUT
PREVCC
CH4 reverse output terminal
CH4 forward output terminal
CH3 forward output terminal
CH3 reverse output terminal
Power part power supply voltage (CH3, 4)
Mute terminal
GND
CH3 PWM reverse input terminal
CH3 PWM forward input terminal
CH4 input terminal
CH4 external CAPA connection terminal
CH4 external reference voltage input terminal
Operational amplifier output terminal
Pre-part power supply voltage
No. PIN NAME DESCRIPTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
OPIN-
OPIN+
SW
CH1FIN
CH1RIN
CH2FIN
CH2RIN
GND
VREFIN
POWVCC
CH2OUTR
CH2OUTF
CH1OUTR
CH1OUTF
Operational amplifier negative input terminal
Operational amplifier positive input terminal
CH4 input selecting switch terminal
CH1 PWM forward input terminal
CH1 PWM reverse input terminal
CH2 PWM forward input terminal
CH2 PWM reverse input terminal
GND
Internal Vref voltage input terminal
Power part power supply voltage (CH1, 2)
CH2 reverse output terminal
CH2 forward output terminal
CH1 reverse output terminal
CH1 forward output terminal
BLOCK DIAGRAM
TERMINAL DESCRIPTION