Yamaha RX-V2300 Service Manual page 40

Av receiver/av amplifier
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RX-V2300/DSP-AX2300
RX-V1300/RX-V1300RDS/HTR-5590/DSP-AX1300
IMP SW/POWER LIMIT (Impedance/power limiter
detection)
IMP: 8 or 4 ohm impedance switch setting
PL: Power limiter detection value
The voltage value of pin No. 135 of IC520 is displayed,
using 5V/256 as standard.
When the power is turned on, the speaker impedance
switch setting is automatically detected, using the input
voltage value of pin No. 135 of IC520.
The output of ports No.60 and No. 61 are controlled by
using the input voltage value of pin No. 135 of IC520.
When higher than VthH, the port output is changed
from L to H.
When lower than VthH, the port output is changed from
H to L.
K0/K1 (Panel key of main unit) [Remote control code: –]
A/D of the key fails to function properly when the standard
value is deviated by ±4%. In this case, check the constant
of partial pressure resistor, solder condition, etc. Refer to
table 2.
(Reference voltage: 5V=100%)
FAN DRIVE TEST (For models so equipped)
For models equipped with a fan
HIGH
FAN DRIVE TEST (For models so equipped)
For models equipped with a fan
MID
FAN DRIVE TEST (For models so equipped)
For models equipped with a fan
LOW
40
(基準電圧:5V=100%)
[Table 2]
Display
K0
00+2
PRESET/TUNING
10±2
PRESET/TUNING
20±2
PRESET/TUNING
30±2
FM/AM
40±2
MEMORY
50±2
TUNING MODE
60±2
RDS MODE
70±2
RDS EON
80±2
PTY MODE
90±2
PTY START
100
KEY OFF
IMP SW/POWER LIMIT (インピーダンス/パワーリミッ
ターの検出)
IMP: インピーダンスSW検出の値
PL: パワーリミッター検出の値
IC520 135ピンの電圧値を5V/256を基準にして表示し
ます。
IC520 135ピンの入力電圧値により、ポートNo.60と61
の出力を制御します。
VthHを越えた場合、ポート出力をLからHにします。
VthLを下回った場合、ポート出力をHからLにします。
K0/K1 (本体パネルキー)
キーのA/Dは基準値から±4%を外れると、正常な動きをし
ません。下表2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。
K1
PROCESSOR DIRECT
BASS EXTENSION
INPUT MODE
SPEAKERS A
SPEAKERS B
EFFECT
PROGRAM
PROGRAM
A/B/C/D/E
KEY OFF
FAN DRIVE TEST (ファン駆動テスト)
ファン装備モデルに適用
HIGH:ファン駆動強
FAN DRIVE TEST (ファン駆動テスト)
ファン装備モデルに適用
MID:ファン駆動中
FAN DRIVE TEST (ファン駆動テスト)
ファン装備モデルに適用
LOW:ファン駆動弱

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