Yamaha RX-V681 Service Manual page 67

P1-6. KEY
Panel key is detected.
When the A/D conversion value of the panel key becomes out of the specified range, normal operation will not
be available.
In that case, check the constant of voltage dividing resistor, solder condition, etc. Refer to table.
* When "P1-6. KEY" menu is selected, keys become inoperable due to detection of the values of all keys. How-
ever, it is possible to return to the "P1-5. LIMITER CONTROL" menu by rotating the "VOLUME" knob counter-
clocwise.
(Reference voltage: 3.3 V=255)
Display
0 – 11
12 – 32
33 – 54
55 – 75
76 – 95
96 – 118
119 – 142
143 – 162
178 – 197
198 – 229
225
P1-7. USB-VBUS
Not for service.
P1-6
KY:255/255/---
KEY1
RADIO
(SCENE4)
NET
(SCENE3)
TV
(SCENE2)
BD/DVD
(SCENE1)
ZONE
CONTROL
ZONE2
INPUT >
(RX-V681)
INPUT <
(RX-V681)
MAIN ZONE
z
TONE
CONTROL
Key off
P1-7
USB-VBUS:200
KEY2
KEY1
Display KEY2
PURE
0 – 11
DIRECT
TUNING
12 – 32
>>
TUNING
33 – 54
<<
55 – 77 AM
78 – 98 FM
PRESET
99 – 120
>
PRESET
121 – 143
<
144 – 165 MEMORY
166 – 185 INFO
186 – 205 STRAIGHT
PROGRAM
206 – 225
>
PROGRAM
226 – 245
<
255 Key off
RX-V681/RX-A760
67