Yamaha HTY-7040 Service Manual page 45

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9. AD DATA CHECK
This menu is used to display the A/D conversion value
of the main CPU which detects panel keys of the main
unit and protection functions in % using the sub-menu.
During signal processing, the condition before execu-
tion is maintained.
* The value in the diagram are given as reference only.
PS (Power supply voltage protection detection)
* When the value of PS, P2 and P3 is not at the normal
value level, the protection function works and the power
is turned off.
(Reference voltage: 3.3V=100%)
PS (PS1) Voltage detects:
Normal value:
P2 (PS2) Voltage detects:
Normal value:
P3 (PS3) Voltage detects:
Normal value:
* The normal value has been revised from 2.5V
(measured value) to 3.3V (indicated value) by the
voltage dividing resistor.
PS:060%[1.98V]
K0/K1 (Panel key of main unit)
A/D of the key fails to function properly when the standard
value is deviated by ±2%. In this case, check the constant
of voltage dividing resistor, solder condition, etc.
(Reference voltage: 3.3V=100%)
-24 V, +12 A, +12 B, +12 V,
+5 V, V5V
48 to 84% (1.61 to 2.78 V)
+10 V (U, C models), T+10
(U, C, T, K, A, G, E, L, V
models), +5.3 X (U, C, B
models), V9V, +5ip (U, C,
A, B models)
59 to 82 % (1.96 to 2.71 V)
+3.3 V
61 to 91 % (2.03 to 3.0 V)
P2:070%[2.31V]
K0:100 K1:100
[%]
K0
0+2
VOLUME +
10±2
INPUT
100-2
NO KEY
YSP-4000/YSP-40D/HTY-7040
9. AD DATA CHECK
本体パネルキー、プロテクションなどを検出している
メインCPUのA/D変換の値を、サブメニューで%表示
します。信号処理は実行前の状態を維持します。
※ 図中の数値は参考例です。
PS (電源電圧プロテクションの検出)
※ PS、P2、P3は正常値を外れるとプロテクションが働
き、電源オフされます。
(基準電圧:3.3V=100%)
PS (PS1)検出電圧: -24 V、+12 A、+12 B、+12 V、
+5 V、V5V
正常値:
48∼84 % (1.61∼2.78 V)
P2 ( PS2)検出電圧: +10 V、V9V
正常値:
59∼82 % (1.96∼2.71 V)
P3 ( PS3)検出電圧: +3.3 V
正常値:
61∼91 % (2.03∼3.0 V)
※ 正常値は分圧抵抗によって2.5 V (実測値) から3.3 V
(表示値) へ変更されています。
P3:075%[2.47V]
K0/K1 (本体パネルキー)
キーのA/Dは基準値から±2%を外れると、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。
(基準電圧:3.3V=100%)
K1
VOLUME -
NO KEY
45

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