Power Limit (Power Limiter Detection); Fan Drive Test - Yamaha RX-V4600/DSP Service Manual

Av receiver/av amplifier
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POWER LIMIT (Power limiter detection)

PL: Power limiter detection value
The voltage value of pin No. 135 of IC520 is displayed,
using 5V/256 as standard.
Based on the input voltage value of pin No.135 of
IC520, the output of pins No.6 (LC1) and No.7 (LC2) of
IC505 is controlled.
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%)
[Table 2]
U, C, R, T, K, A, B, G, L models
Display
0+2
PRESET/TUNING
10±2
PRESET/TUNING
20±2
PRESET/TUNING
30±2
40±2
50±2
TUNING MODE
60±2
STRAIGHT / EFFECT
70±2
TONE CONTROL
80±2
90±2
100
FAN DRIVE TEST (For models so equipped)
HIGH
FAN DRIVE TEST (For models so equipped)
MID
FAN DRIVE TEST (For models so equipped)
LOW
K0
K1
SPEAKERS A
SPEAKERS B
FM/AM
AUDIO SELECT
MEMORY
A/B/C/D/E
ZONE CONTROL
PURE DIRECT
KEY OFF
KEY OFF
POWER LIMIT (パワーリミッターの検出)
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、IC505の6ピン
(LC1) と7ピン (LC2) の出力を制御します。
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。
(基準電圧:5V=100%)
J model
Display
K0
0+2
PRESET/TUNING
10±2
PRESET/TUNING
SPEAKERS A
20±2
PRESET/TUNING / EDIT
SPEAKERS B
30±2
FM/AM
AUDIO SELECT
40±2
MEMORY
A/B/C/D/E
50±2
TUNING MODE
60±2
STRAIGHT / EFFECT
PURE DIRECT
70±2
TONE CONTROL
80±2
90±2
100
KEY OFF
KEY OFF
FAN DRIVE TEST (ファン駆動テスト)
HIGH:ファン駆動 強
FAN DRIVE TEST (ファン駆動テスト)
MID:ファン駆動 中
FAN DRIVE TEST (ファン駆動テスト)
LOW:ファン駆動 弱
RX-V4600/DSP-AX4600
K1
41

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Ax4600Rx-v4600Dsp-ax4600

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