MSR800W
15
■
INSPECTIONS
1.
Measuring conditions
1-1.
Measuring voltage:
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)
1-2.
Load resistance:
8
Ω
/ Power capacity 1000 W
1-3.
LEVEL control setting:
Min.
1-4.
CUTOFF FREQ. control setting:
Max. (100 Hz)
1-5.
Room temperature:
24±4
℃
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
Conditions
Values
Input
Output
Typical
Limited
1
Output power
LEVEL: Max. (10), 100 Hz input
1% THD output
550 W
500 W
2
Distortion (THD+N)
(with 20 Hz - 20 kHz filter)
LEVEL: Max. (10), 100 Hz input
400 W output
0.05%
0.1%
3
Voltage gain
LEVEL: Max. (10), 40 Hz input, –6.5 dBu
*
34 dB
34±1 dB
4
Cutoff frequency characteristics
CUTOFF FREQ.: Min.
(Ref.: 40 Hz input, 100mV)
(–3 dB)
62 Hz
62±5 Hz
CUTOFF FREQ.: Center
(Ref.: 40 Hz input, 100mV)
(–3 dB)
65 Hz
65±5 Hz
CUTOFF FREQ.: Max.
(Ref.: 40 Hz input, 100mV)
(–3 dB)
70 Hz
70±5 Hz
5
HIGH PASS OUTPUT
frequency response
Cutoff frequency (100Hz, –3 dB)
(Ref: 1kHz input, 100 mV)
103 Hz
103±5 Hz
Characteristic (50Hz, Oct/dB)
(Ref: 1kHz input, 100 mV)
–18 dB
–18±3 dB
6
Frequency response
characteristic
CU
TO
FF
FREQ
. c
ontrol
80 Hz
(Min.)
20 Hz input
(Ref.: 40 Hz input)
(Ref.: 10 W output) –11 dB
–11±2 dB
30 Hz input
(Ref.: 40 Hz input)
–2 dB
–2±1 dB
50 Hz input
(Ref.: 40 Hz input)
–1 dB
–1±1 dB
100 Hz input
(Ref.: 40 Hz input)
–10 dB
–10±2 dB
100 Hz
(Max.)
20 Hz input
(Ref.: 40 Hz input)
(Ref.: 10 W output) –11 dB
–11±2 dB
30 Hz input
(Ref.: 40 Hz input)
–2 dB
–2±1 dB
50 Hz input
(Ref.: 40 Hz input)
0 dB
0±1 dB
100 Hz input
(Ref.: 40 Hz input)
–7 dB
–7±2 dB
7
DC offset
without signal input
±8 mV
±8±12 mV
8
S/N ratio
(with A-weight filter)
100 Hz input
LEVEL: Max. (10)
500 W output
100 dB
95 dB
9
Gain/Efficiency
(Primary side power consumption)
100 Hz input
220 W output
440 W
440±50 W
10 Noise level
(with 20 Hz - 20 kHz filter)
LEVEL: Min. (0)
Input: grounded with 600
Ω
resistance
LF OUTPUT
(Speaker terminal)
≦
0.5 mV
LEVEL: Min. (0)
Input: grounded with 600
Ω
resistance
HIGH PASS
OUTPUT (A)
0.024 mV
0.024±0.02 mV
LEVEL: Min. (0)
Input: grounded with 600
Ω
resistance
HIGH PASS
OUTPUT (B)
0.024 mV
0.024±0.02 mV
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