Yamaha AVR-S80 Service Manual page 37

IC1: M30624FGAFP (MAIN P.C.B.)
CPU
G
KEY input (A-D) Pull-up resistance 10 k-ohms
Ω
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
Ω
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
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