Yamaha NS-BP300, Руководство по обслуживанию

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R-840/NS-BP300
R-840/NS-BP30
0
4 A . K E Y : 1 0 2 3
4 B . D S T : 0 8 5 5
4-A. KEY
Panel keys detection
The voltage at 74 pin (I-KEY0) of microprocessor IC101 is displayed.
(Reference voltage: 5.0 V = 1023)
4-B. DST
Destination detection
The voltage at 81 pin (DEST) of microprocessor IC101 is displayed.
(Reference voltage: 5.0 V = 1023)
Key detection for A/D port
Key input (A/D) pull-up resistance 10 k-ohms
Destination detection for A/D port
Destination input (A/D) pull-up resistance 10 k-ohms
Ohm 0 +1.2 k +91 k
V 0 – 0.2 0.3 – 0.8 4.0 – 5.0
A/D value (5V=1023) 0 – 40 60 – 165 820 – 1023
I-KEY0 (91 pin) PRESET UP PRESET DOWN PURE DIRECT
Ohm 1.2 k 4.7 k 6.8 k 15.0 k 24.0 k 47.0 k 100.0 k
V 0.2 – 1.0 1.1 – 1.8 1.9 – 2.5 2.6 – 3.2 3.3 – 3.8 3.9 – 4.3 4.4 – 4.8
A/D value (5V=1023) 40 – 205 225 – 370 390 – 510 530 – 655 675 – 780 800 – 880 900 – 985
DEST (81 pin) C V T, K A B G L