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Yamaha AVR-S80 Service Manual page 37

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IC1: M30624FGAFP (MAIN P.C.B.)
CPU
G
KEY input (A-D) Pull-up resistance 10 k-ohms
0
+1.2k
V
0~0.25
~0.75
KEY 0
A/B/C/D/E
VOLUME–
(92 pin)
KEY 1
INPUT MODE
PRESET/TUNING–
(91 pin)
G
Tuner Destination select (89 pin A-D) Pull-up resistance 10 k-ohms
0
V
~0.25
Destination
R (50k / 9k)
+1.2k
+1.8k
+2.7k
~1.25
~1.75
~2.25
VOLUME+
NO KEY
DSP
PRESET/TUNING+
PRESET/BAND
NO KEY
1.2k
24k
~0.75
~3.75
A
R (100k / 10k)
+3.3k
+4.7k
+8.2k
~2.75
~3.25
~3.75
NO KEY
INPUT
STEREO
NO KEY
AUTO/MAN'L
MEMORY
39k
91k
~4.25
~4.75
U, C
B, G
AVR-S80/NX-SW80
∞ (Pull-up only)
4.75~5
J
37

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