Inspection; Measuring Conditions; Inspections; Idling Current Adjustment - Yamaha MSR800W Service Manual

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■ INSPECTIONS

1.

Measuring conditions

1-1. Measuring voltage:
1-2. Load resistance:
1-3. LEVEL control setting:
1-4. CUTOFF FREQ. control setting:
1-5. Room temperature:
2. Inspections
2-1. Power on muting time:
Check that the muting function is cancelled and the relay turns on in 3±1 seconds after the power switch is turned on.
Also, check the POWER indicator lights up.

2-2. Idling current adjustment:

Adjust VR201 and VR202 so that the voltage between pins 1 and 2 of CN205 and CN206 becomes 1±0.2 mV respectively.
2-3. General inspections:
Measure the following items in condition given below, and check the following values are satisfied.
Items
1 Output power
2 Distortion (THD+N)
(with 20 Hz - 20 kHz filter)
3 Voltage gain
4 Cutoff frequency characteristics
TE
L 13942296513
5 HIGH PASS OUTPUT
frequency response
6 Frequency response
characteristic
7 DC offset
8 S/N ratio
(with A-weight filter)
9 Gain/Efficiency
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(Primary side power consumption)
10 Noise level
(with 20 Hz - 20 kHz filter)
.
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AC 120 V, 60 Hz (U)
AC 230 V, 50 Hz (H, B)
AC 240 V, 50 Hz (A)
AC 220 V, 50 Hz (O)
8 Ω / Power capacity 1000 W
Min.
Max. (100 Hz)
24±4 ℃
Conditions
Input
LEVEL: Max. (10), 100 Hz input
LEVEL: Max. (10), 100 Hz input
LEVEL: Max. (10), 40 Hz input, –6.5 dBu*
CUTOFF FREQ.: Min.
(Ref.: 40 Hz input, 100mV)
CUTOFF FREQ.: Center
(Ref.: 40 Hz input, 100mV)
CUTOFF FREQ.: Max.
(Ref.: 40 Hz input, 100mV)
Cutoff frequency (100Hz, –3 dB)
(Ref: 1kHz input, 100 mV)
Characteristic (50Hz, Oct/dB)
(Ref: 1kHz input, 100 mV)
80 Hz 20 Hz input
(Min.) (Ref.: 40 Hz input)
30 Hz input
(Ref.: 40 Hz input)
50 Hz input
(Ref.: 40 Hz input)
100 Hz input
(Ref.: 40 Hz input)
100 Hz 20 Hz input
(Max.) (Ref.: 40 Hz input)
30 Hz input
(Ref.: 40 Hz input)
50 Hz input
(Ref.: 40 Hz input)
100 Hz input
(Ref.: 40 Hz input)
without signal input
100 Hz input
LEVEL: Max. (10)
100 Hz input
LEVEL: Min. (0)
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y
Input: grounded with 600 Ω resistance
LEVEL: Min. (0)
i
Input: grounded with 600 Ω resistance
LEVEL: Min. (0)
Input: grounded with 600 Ω resistance
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2 9
8
Output
1% THD output
400 W output
(–3 dB)
Q Q
3 6 7 1 3 1 5
(–3 dB)
(–3 dB)
(Ref.: 10 W output) –11 dB
(Ref.: 10 W output) –11 dB
500 W output
220 W output
LF OUTPUT
co
(Speaker terminal)
HIGH PASS
.
OUTPUT (A)
HIGH PASS
OUTPUT (B)
9 4 2 8
Values
Typical Limited
550 W 500 W
0.05% 0.1%
34 dB 34±1 dB
62 Hz 62±5 Hz
0 5 8 2 9 9 4 2 8
65 Hz 65±5 Hz
70 Hz 70±5 Hz
103 Hz 103±5 Hz
–18 dB –18±3 dB
–11±2 dB
–2 dB –2±1 dB
–1 dB –1±1 dB
–10 dB –10±2 dB
–11±2 dB
–2 dB –2±1 dB
0 dB 0±1 dB
–7 dB –7±2 dB
±8 mV ±8±12 mV
100 dB 95 dB
m
440 W 440±50 W
≦ 0.5 mV
0.024 mV 0.024±0.02 mV
0.024 mV 0.024±0.02 mV
MSR800W
9 9
9 9
15