Marantz SC7S1/F1N, Service Manual

Page: 29 / 36

37
+5V
Master ON
Relay
END Relay
Power ON
Relay x 2
1
2
3
4
5
6
6
5
4
3
2
1
Master_H
ID
BUS IN
BUS OUT
+12V
M-GND
M-GND
Return-c
Return-H
IN-C
IN-H
+12V
M-GND
Detect
Return-C
Return-H
OUT-C
OUT-H
L274
-12V
+12V
Master ON
Relay
L273
Lo
Q277
L275
Q274
S274(ID SW)
Q275
Q273
L271
L271
L272
Q276
Hi
- 12V
- 12V
IN
OUT
Q201
40
45
46
S274
62
+5V
Master ON
Relay
END Relay
Power ON
Relay x 2
1
2
3
4
5
6
6
5
4
3
2
1
Master_H
ID
BUS IN
BUS OUT
+12V
M-GND
M-GND
Return-c
Return-H
IN-C
IN-H
+12V
M-GND
Detect
Return-C
Return-H
OUT-C
OUT-H
L274
-12V
+12V
Master ON
Relay
L273
Lo
Q277
L275
Q274
Q275
Q273
L271
L271
L272
Q276
Lo
- 12V
- 12V
Q201
40
45
46
S274
62
+5V
Master ON
Relay
END Relay
Power ON
Relay x 2
1
2
3
4
5
6
6
5
4
3
2
1
Master_H
ID
BUS IN
BUS OUT
+12V
M-GND
M-GND
Return-c
Return-H
IN-C
IN-H
+12V
M-GND
Detect
Return-C
Return-H
OUT-C
OUT-H
L274
-12V
+12V
Master ON
Relay
L273
Hi
Q277
L275
Q274
Q275
Q273
L271
L271
L272
Q276
Lo
-12V
- 12V
Q201
40
45
46
S274
62
ID:2
ID:3
ID:1
IN
OUT
IN
OUT
MASTER
SLAVE
SLAVE
S274(ID SW)
S274(ID SW)
: OUT- H, IN- H (BUS IN/OUT)
: Return-H (BUS Return)
: Return-C (Master BUS GND)
: OUT-C, IN-C (Slave BUS GND)
BUS Loop
off
on
on
on
off
off
off
on
off
on
off
on
-12V
-12V
-12V
-12V
-12V
-12V
-12V
-12V
-12V
: +12V (END Relay Supply)
: -12V (END Relay Supply)
: M-GND (END Relay Detect GND)
Bus Connection System Data Flow