Yamaha MSR800W Service Manual

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Contents

MSR800W15■ INSPECTIONS1. Measuring conditions1-1. 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 W1-3. LEVEL control setting: Min.1-4. CUTOFF FREQ. control setting: Max. (100 Hz)1-5. Room temperature: 24±42. Inspections2-1. 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 ValuesInput Output Typical Limited1 Output power LEVEL: Max. (10), 100 Hz input 1% THD output 550 W 500 W2 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 dB4 Cutoff frequency characteristics CUTOFF FREQ.: Min.(Ref.: 40 Hz input, 100mV)(–3 dB) 62 Hz 62±5 HzCUTOFF FREQ.: Center(Ref.: 40 Hz input, 100mV)(–3 dB) 65 Hz 65±5 HzCUTOFF FREQ.: Max.(Ref.: 40 Hz input, 100mV)(–3 dB) 70 Hz 70±5 Hz5 HIGH PASS OUTPUTfrequency responseCutoff frequency (100Hz, –3 dB)(Ref: 1kHz input, 100 mV)103 Hz 103±5 HzCharacteristic (50Hz, Oct/dB)(Ref: 1kHz input, 100 mV)–18 dB –18±3 dB6 Frequency responsecharacteristicCUTOFF FREQ. control80 Hz(Min.)20 Hz input(Ref.: 40 Hz input)(Ref.: 10 W output) –11 dB –11±2 dB30 Hz input(Ref.: 40 Hz input)–2 dB –2±1 dB50 Hz input(Ref.: 40 Hz input)–1 dB –1±1 dB100 Hz input(Ref.: 40 Hz input)–10 dB –10±2 dB100 Hz(Max.) 20 Hz input(Ref.: 40 Hz input) (Ref.: 10 W output) –11 dB –11±2 dB30 Hz input(Ref.: 40 Hz input) –2 dB –2±1 dB50 Hz input(Ref.: 40 Hz input)0 dB 0±1 dB100 Hz input(Ref.: 40 Hz input) –7 dB –7±2 dB7 DC offset without signal input ±8 mV ±8±12 mV8 S/N ratio(with A-weight filter)100 Hz inputLEVEL: Max. (10)500 W output 100 dB 95 dB9 Gain/Efficiency(Primary side power consumption)100 Hz input 220 W output 440 W 440±50 W10 Noise level(with 20 Hz - 20 kHz filter)LEVEL: Min. (0)Input: grounded with 600 Ω resistanceLF OUTPUT(Speaker terminal) 0.5 mVLEVEL: Min. (0)Input: grounded with 600 Ω resistanceHIGH PASSOUTPUT (A)0.024 mV 0.024±0.02 mVLEVEL: Min. (0)Input: grounded with 600 Ω resistanceHIGH PASSOUTPUT (B)0.024 mV 0.024±0.02 mV