Yamaha Aventage RX-A770, Service Manual

Page: 90 / 207

90
RX-V683/RX-A770
RX-V683/RX-A770
K ey detection for A/D port
K ey input (A/D) pull-up resistance: 10 k-ohms
0 Ω + 1.0 k Ω + 1.0 k Ω + 1. 5 k Ω + 1. 5 k Ω + 2.2 k Ω
Detected voltage value
at 9 1 pin
0 – 0.1 5 V 0.1 5 – 0. 4 2 V 0. 4 3 – 0.70 V 0.71 – 0. 9 7 V 0. 9 8 – 1.2 4 V 1.2 5 – 1. 5 3 V
A/D value
(3.3 V=2 55 )
0 – 11 12 – 32 33 – 54 55 – 7 5 76 – 95 9 6 – 118
K EY1
RADIO
(SCENE 4 )
NET
(SCENE3)
TV
(SCENE2)
BD/DVD
(SCENE1)
ZONE
CONTROL
ZONE2
+ 3.3 k Ω + 4 .7 k Ω + 2.2 k Ω + 3.3 k Ω
Detected voltage value
at 9 1 pin
1. 54 – 1.8 4 V 1.8 5 – 2.22 V 2.23 – 2.62 V 2.63 – 3.0 4 V
A/D value
(3.3 V=2 55 )
11 9 – 1 4 2 1 4 3 – 162 178 – 1 9 7 1 9 8 – 22 9
K EY1
INPUT >
(RX-V683
model)
INPUT <
(RX-V683
model)
MAIN ZONE
z
(power)
INFO
0 Ω + 1.0 k Ω + 1.0 k Ω + 1. 5 k Ω + 1.8 k Ω + 2.2 k Ω
Detected voltage value
at 9 2 pin
0 – 0.1 5 V 0.16 – 0. 4 2 V 0. 4 3 – 0.70 V 0.71 – 0. 99 V 1.00 – 1.27 V 1.28 – 1. 5 6 V
A/D value
(3.3 V=2 55 )
0 – 11 12 – 32 33 – 54 55 – 77 78 – 9 8 99 – 120
K EY2
PURE
DIRECT
TUNING
>>
TUNING
<<
AM FM
PRESET
>
+ 3.3 k Ω + 4 .7 k Ω + 6.8 k Ω + 10 k Ω + 22 k Ω + 68 k Ω
Detected voltage value
at 9 2 pin
1. 5 7 – 1.86 V 1.87 – 2.1 4 V 2.1 5 – 2.3 9 V 2. 4 0 – 2.6 5 V 2.66 – 2. 9 1 V 2. 9 2 – 3.17 V
A/D value
(3.3 V=2 55 )
121 – 1 4 3 1 44 – 16 5 166 – 18 5 186 – 20 5 206 – 22 5 226 – 2 45
K EY2
PRESET
<
MEMORY
TONE
CONTROL
STRAIG H T
PROGRAM
>
PROGRAM
<