Yamaha RX-V681 Service Manual page 80

RX-V681/RX-A760
Key detection for A/D port
Key input (A/D) pull-up resistance: 10 k-ohms
Detected voltage value
at 91 pin
A/D value
(3.3 V=255)
KEY1
Detected voltage value
at 91 pin
A/D value
(3.3 V=255)
KEY1
Detected voltage value
at 92 pin
A/D value
(3.3 V=255)
KEY2
Detected voltage value
at 92 pin
A/D value
(3.3 V=255)
KEY2
80
0 Ω + 1.0 k Ω
0 – 0.15 V 0.15 – 0.42 V
0 – 11 12 – 32
RADIO NET
(SCENE4) (SCENE3)
+ 3.3 k Ω + 4.7 k Ω
1.54 – 1.84 V 1.85 – 2.22 V
119 – 142 143 – 162
INPUT > INPUT <
(RX-V681 model)
0 Ω + 1.0 k Ω
0 – 0.15 V 0.16 – 0.42 V
0 – 11 12 – 32
PURE TUNING
DIRECT >>
+ 3.3 k Ω + 4.7 k Ω
1.57 – 1.86 V 1.87 – 2.14 V
121 – 143 144 – 165
PRESET
MEMORY
<
+ 1.0 k Ω + 1.5 k Ω
0.43 – 0.70 V 0.71 – 0.97 V
33 – 54 55 – 75
TV BD/DVD
(SCENE2) (SCENE1)
+ 2.2 k Ω + 3.3 k Ω
2.23 – 2.62 V 2.63 – 3.04 V
178 – 197 198 – 229
MAIN ZONE z TONE
(power) CONTROL
+ 1.0 k Ω + 1.5 k Ω
0.43 – 0.70 V 0.71 – 0.99 V
33 – 54 55 – 77
TUNING
AM
<<
+ 6.8 k Ω + 10 k Ω
2.15 – 2.39 V 2.40 – 2.65 V
166 – 185 186 – 205
INFO STRAIGHT
+ 1.5 k Ω + 2.2 k Ω
0.98 – 1.24 V 1.25 – 1.53 V
76 – 95 96 – 118
ZONE
ZONE2
CONTROL
+ 1.8 k Ω + 2.2 k Ω
1.00 – 1.27 V 1.28 – 1.56 V
78 – 98 99 – 120
PRESET
FM
>
+ 22 k Ω + 68 k Ω
2.66 – 2.91 V 2.92 – 3.17 V
206 – 225 226 – 245
PROGRAM PROGRAM
> <