Yamaha P-4050 [5/18] Thermal indicator

Содержание

• Yamaha p.1
• Power amplifier amplificateur de puissance p.1
• Connecting the plug and cord warning this apparatus must be earthed p.2
• This applies only to products distributed by yamaha canada music ltd p.2
• Important notice for the united kingdom p.2
• Fcc information u s a p.2
• Canada p.2
• Applies only to products distributed by yamaha corporation of america p.2
• This applies only to products distributed by yamaha kemble music u k ltd p.2
• Vibration p.4
• Removing connections p.4
• Precautions p.4
• Or modifications yourself p.4
• Make sure power is off before making or p.4
• Handle cables carefully p.4
• Do not open the case or attempt repairs p.4
• Clean with a soft dry cloth p.4
• Avoid physical shocks p.4
• Avoid excessive heat humidity dust and p.4
• Amplifier ventilation p.4
• Always use the correct power supply p.4
• Air filter maintenance p.4
• Thermal indicator p.5
• Input attenuators p.5
• Cooling fans p.5
• Protection indicator p.5
• Power switch indicator p.5
• Operation p.5
• Rear panel p.6
• Speaker terminals p.7
• Output mode switch p.7
• O input terminals screw type p.7
• Input mode switch p.7
• Input connectors trs phone type p.7
• Gnd terminal p.7
• 2сн e e p.7
• Connections p.8
• Combining the input mode and output mode switch settings the amplifier offers the following six application setups p.8
• Amplifier with 4 inputs and 4 outputs amplifier with 1 input and 4 outputs p.8
• 4 inputs 4 outputs 1 input 4 outputs 3 inputs 3 outputs 1 input 3 outputs 2 inputs 2 outputs 1 input 2 outputs p.8
• To input terminals p.8
• Mixer or pre amp output p.8
• D c b b a b p.8
• To input terminals p.9
• Mixer or pre amp output p.9
• C 0 a d p.9
• C 0 a b p.9
• Portable rack mounting p.10
• Permanent rack mounting p.10
• Installation details p.10
• Caution for speaker connection p.11
• Make sure the power to the amplifier is off p.12
• Indicator display probable cause remedy protective circuit operation p.12
• If the filter elements are exceptionally dirty deter gent washing up liquid may be used p.12
• Dry the filter elements thoroughly p.12
• Cleaning the filter elements p.12
• Troubleshooting p.12
• To ensure adequate cooling air intake the filter element must be cleaned when it has become clogged the following points describe the cleaning procedure p.12
• The following table lists the main causes of abnormal operation and the corrective measures required as well as the protective circuit operation in each case p.12
• Remove the power plug from the ac mains socket p.12
• Remove the filter elements and wash in plain water p.12
• Never replace the filter elements while they are still wet replace the elements and front filter grilles the replacement part number of the filter element is vm57950 p.12
• Specifications p.13
• Purchaser user information specified in en55103 1 and en55103 2 inrush current 16a conformed environment el e2 e3 and e4 p.13
• For european model p.13
• Thd vs output power p.14
• Performance graphs p.14
• Output power vs power consumption p.14
• Frequency response p.14
• Channel separation p.14
• Block diagram p.15
• Dimensions p.16
• Unit mm inch p.16
• Varoitus p.17
• Service p.17
• Observera p.17
• Kundendienst p.17
• Entretien p.17
• Caution p.17
• Avvertenza p.17
• Attention p.17
• Advarsel p.17
• Achtung p.17
• Yamaha corporation p.18
• Yamaha p.18

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OPERATION FRONT PANEL O POWER Switch Indicator Pressing this switch turns the power ON and press ing again turns the power OFF The indicator lights when the power is ON THERMAL Indicator When the heat sink temperature exceeds 80 degC the cooling fan will operate at high speed and the thermal indicator will light If the indicator remains lit for a long time check for cooling problems such as blocked air vents For proper ventilation details refer to the Installation Details on page 8 Cooling Fans The amplifier is cooled with a variable rate cooling fans When there is ncr output signal or when the heat sink temperature is low the fan is stopped When the heat sink temperature exceeds 60 degC the fan will begin to rotate The fan speed will increase as the heat sink temperature increases PROTECTION Indicator The PROTECTION indicator lights for approximately 7 seconds after the POWER switch is pressed to indicate that the protection circuitry is operating No sound is output from the speakers while this indicator is lit This indicator will also light and sound will be cut off to the speakers if the protection circuitry is activated at any other time during ampli fier operation due to factors such as overheating or the detection of excessive DC voltage at the outputs When the problem is corrected the protection cir cuitry is automatically deactivated the indicator goes out and the amplifier resumes normal operation 0 Input Attenuators The input attenuators are 31 position click stop controls used for adjusting input sensitivity Rotating fully in the clockwise direction sets the attenuator at 0 dB while rotating fully in the counterclockwise di rection provides infinite attenuation 3