Yamaha NS-BP300 Service Manual page 68

A B C
R-840/NS-BP300
MAIN 3/4
1
2
MAIN (3)
3
Key detection for A/D port
Key input (A/D) pull-up resistance 10 k-ohms
Ohm
V
A/D value (5V=1024)
I-KEY0 (91 pin) PRESET UP
4
5.2
5.2
4.8 0
5 4.3
0.6
2.0 0.6
POWER
indicator
6
0
7
0
0 0
0
0
8
0 0
0 0
JK801
0 0
PHONES
9
10
68
D E F
0 +1.2 k +91 k
0 – 0.2 0.3 – 0.8 4.0 – 5.0
0 – 40 60 – 165 820 – 1023
PRESET DOWN PURE DIRECT
INPUT
5.1 0
5.1
TIMER TP
5.2 5.1 indicator
indicator
3.5
3.8
0 0
0 0
0 0
0 0
Page 69 C7
to MAIN (5)_CB52
G H I
27.2 5.0
5.5
5.0
0
0
0
PRESET PURE 0 0
DIRECT
5.1
PURE-
DIRECT
indicator
2.9
0
0
0
0 0
0
Page 65 B3
to FUNCTION (1)_CB101
J K L
4.6
0
Page 69 D10
to MAIN (5)_CB51
M N
MAIN (6)
★ All voltages are measured with a 10MΩ/V DC electronic voltmeter.
★ Components having special characteristics are marked
and must be replaced
with parts having specifications equal to those originally installed.
★ Schematic diagram is subject to change without notice.