Denon UD-M31, Service Manual

Page: 18 / 45

18
18 UD-M31
LA6559(IC801)
1 REV
5CH output change terminal, logic input of
loading block
2 S-Vcc
signal system power supply
(BTL-AMP:CH1~4)
3 Vcc2 Power supply for loading block
4 VLO- Loading output (-)
5 VL0+ Loading output (+)
6 VO4+ Output terminal (+) for channel 4
7 VO4- Output terminal ( ) for channel 4
8 VO3+ Output terminal (+) for channel 3
9 VO3- Output terminal (- ) for channel 3
10 VO2+ Output terminal (+) for channel 2
11 VO2- Output terminal (- ) for channel 2
12 VO1+ Output terminal (+) for channel 1
13 VO1- Output terminal (- ) for channel 1
14 Vcc1 CH1 `CH4(BTL-AMP) output stage power supply
15 VIN1 Input terminal for channel 1
16 VIN1- OP-AMP input AMP-A input terminal (- )
17 VIN1+ OP-AMP input AMP-A input terminal (+)
18 VIN2 Input terminal for channel 2, input AMP output
19 VIN2- Input terminal (- ) for channel 2
20 VIN2+ Input terminal (+) for channel 2
21 Vcc-VREG 3.3VREG power supply
22 GND-VREG 3.3VREG GND
23 VIN3 Input terminal for channel 3, input AMP output
24 VIN3- Input terminal (- ) for channel 3
25 VIN3+ Input terminal (+) for channel 3
26 REG-IN PNP transistor base connected
27 REG-OUT
3.3V power output to which the PNP transistor
collector connected
28 VCONT Loading output voltage set terminal
29 VREF-IN Reference voltage applied terminal
30 VIN4+ Input terminal (+) for channel 4
31 VIN4- Input terminal (- ) for channel 4
32 VIN4 Input terminal for channel 4, input AMP output
33 MUTE1 Output ON/OFF for channel 1 (BTL AMP)
34 MUTE2 Output ON/OFF for channel 2 to 4 (BTL AMP)
35 S-GND Signal system GND
36 FWD
Output change terminal (FWD) for loading
output (VLO+,-), logic input of loading block
Pin
No.
Name Function
1
2
3
4
5
6
7
8
9
FR
10
11
12
13
14
15
16
17
18
36
35
34
33
32
31
30
29
28
FR
27
26
25
24
23
22
21
20
19
FWD
S-GND
MUTE2
MUTE1
VIN4
VIN4-
VIN4+
VREF-IN
VCONT(LOADING)
FR
REG-OUT
REG-IN
VIN3+
VIN3-
VIN3
GND-VREG
VCC-VREG
VIN2+
VIN2-
REV
S-VCC
VCC2
VLO-
VLO+
VO4+
VO4-
VO3+
VO3-
FR
VO2+
VO2-
VO1+
VO1-
VCC1
VIN1
VIN1-
VIN1+
VIN2
Signal System VCC
(CH1 to CH4)
33k
11k
33k
11k
3.3VREG GND
3.3VREG
33k
11k
3.3VREG
PNP Tr
Base
PNP Tr
Collector
33k
11k
CH1 Output
ON/OFF
CH2 to CH4
Output
MUTE1
MUTE2
(LOADING)
Power Supply
Input
(Forward/Reverse/
Break/OFF)
O
utput
Control
Level
Shi
ft
Level
Shi
ft
Power
System
GND
Level
Shi
ft
Level
Shi
ft
Power Supply
Power Supply
(External PNP)
Power System GND
Signal System GND
Thermal
Shutdown
-
)
S
11k
PNP Tr
Base
11k
t
(LOADING)
Power Supply
Input
(For rd/Reverse/
O
utput
Power
System
ft
u
)
T
Sh