Yamaha RX-V757 Service Manual page 17

K0/K1
This is the A/D value of the panel key input ports KEY0 and
KEY1 (microprocessor). The table below shows the A/D value
obtained when each key is pressed. When the value is not
within the standard value range, no correct operation is pro-
vided. Referring to the table below, check the value of each
voltage dividing resistor of each key, solder condition, etc.
[Table 1]
RX-V757 (U, C, A, G models) / RX-V657 (U, C, A, B, G, E models)
Display (%) K0
0 - 6
MAIN POWER
7 - 13
–
14 - 21 –
22 - 31 –
32 - 41
INPUT MODE
42 - 53
STRAIGHT
54 - 63 TONE CONTROL
64 - 72 PRESET/TUNING
73 - 80
SPEAKERS B
81 - 88 SPEAKERS A
89 - 95 PURE DIRECT
96 - 100
KEY OFF
[Table 1]
DSP-AX757SE (B model)
Display (%) K0
0 - 6 –
7 - 13
–
14 - 21 –
22 - 31 –
32 - 41
INPUT MODE
42 - 53
STRAIGHT
54 - 63 TONE CONTROL
64 - 72 –
73 - 80
SPEAKERS B
81 - 88 SPEAKERS A
89 - 95 PURE DIRECT
96 - 100
KEY OFF
K0/K1
本体パネルキー入力ポートKEY0、 KEY1 （ マイコン） のA/D値
です。 それぞれのキーが押された場合のA/D値は下表の通り
です。
基準値から外れると、 正常な動きをしません。 下表 をご覧に
なり、 各キーの分圧抵抗の定数、 ハンダ不良等の確認をして
ください。
K0:100 K1:099
[Table 1]
RX-V757 (R, T, K models) / DSP-AX757 (J model) / RX-V657 (R, T, K, L models)
K1
Z2 POWER
–
–
–
MULTI CH INPUT
FM/AM
A/B/C/D/E
PRESET/TUNING q
PRESET/TUNING w
MEMORY
TUNING MODE
KEY OFF
[Table 1]
HTR-5860 (U, C, A models)
K1
–
–
–
–
MULTI CH INPUT
–
NEXT
LEVEL -
LEVEL +
–
–
KEY OFF
RX-V757/DSP-AX757/DSP-AX757SE
Display (%) K0
0 - 6
–
7 - 13
–
14 - 21 –
22 - 31 –
32 - 41
INPUT MODE
42 - 53
STRAIGHT
54 - 63 TONE CONTROL
64 - 72 PRESET/TUNING
73 - 80
SPEAKERS B
81 - 88 SPEAKERS A
89 - 95 PURE DIRECT
96 - 100
KEY OFF
Display (%) K0
0 - 6
–
7 - 13 –
14 - 21 –
22 - 31
–
32 - 41 INPUT MODE
42 - 53 STRAIGHT
54 - 63
TONE CONTROL
64 - 72
PRESET/TUNING
73 - 80 SPEAKERS B
81 - 88 SPEAKERS A
89 - 95
PURE DIRECT
96 - 100 KEY OFF
RX-V657/HTR-5860
K1
–
–
–
–
MULTI CH INPUT
FM/AM
A/B/C/D/E
PRESET/TUNING q
PRESET/TUNING w
MEMORY
TUNING MODE
KEY OFF
K1
–
–
–
–
MULTI CH INPUT
FM/AM
A/B/C/D/E
PRESET/TUNING q
PRESET/TUNING w
MEMORY
TUNING MODE
KEY OFF
43