User manual YAMAHA C450

[. . . ] The EEEngine's energy-saver/low-heat-generation design has reduced power consumption to 50% or less, and reduced heat generation to 35% or less (in field applications, compared to Yamaha's previous models), and has lead to a reduction in energy cost and to less-restrictive installation requirements related to heat generation. This owner's manual covers the three models C450, C320 and C160. In order to take full advantage of your power amp and enjoy long and trouble-free operation, please read this owner's manual carefully before use. IMPORTANT NOTICE FOR THE UNITED KINGDOM Connecting the Plug and Cord WARNING: THIS APPARATUS MUST BE EARTHED IMPORTANT: The wires in this mains lead are coloured in accordance with the following code: GREEN-AND-YELLOW BLUE BROWN : EARTH : NEUTRAL : LIVE As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows: The wire which is coloured GREEN and YELLOW must be connected to the terminal in the plug which is marked by the letter E or by the safety earth symbol or coloured GREEN and YELLOW. The wire which is coloured BLUE must be connected to the terminal which is marked with the letter N or coloured BLACK. [. . . ] 6 Mounting four or fewer amps in an open-backed rack . . . . . . . . . 6 Mounting five or more amps, or when (even with four or fewer units) the back of the rack cannot be left open . . . . . . . . . . 6 Portable Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Positioning the Housed Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Performance Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Controls and Functions s Front Panel 2 3 4 A TEMP PROTECTION POWER CLIP SIGNAL B ON OFF 1 5 1 POWER switch and indicator This is the main POWER switch. The POWER indicator lights up when the amplifier is powered ON. 2 TEMP indicator When the temperature of the heat sink exceeds 85 degrees Celsius, this indicator will light red. 3 PROTECTION indicator This red LED indicator lights up for approximately 3 seconds when the amplifier is powered ON, indicating that the soft-start protection system is working. No sound is output during soft-start up. If one of the protection systems is activated during normal use, this indicator lights up and no sound is output. The speaker system is actually disconnected from the amplifier outputs when this indicator lights up. The protection systems are activated when overheating occurs or a DC voltage is present at the amplifier outputs. If the problem is corrected, the protection systems deactivate automatically, this indicator goes out, and normal amplifier operation is resumed. 4 CLIP indicators These red LED indicators light up when the respective channel's output signal distortion exceeds 1% (i. e. Output signal clipping is usually due to excessive input signal levels. 5 SIGNAL indicators These green LED indicators light up when the respective channel's output signal exceeds 2 Vrms. This is equivalent to 1/2 watt into 8, 1 W into 4. 2 s Rear Panel 2 3 4 5 INPUT CHANNEL B G CHANNEL A G (BRIDGE) (PARALLEL) BRIDGE CHANNEL B SPEAKERS CHANNEL A BRIDGE STEREO 20 25 30 40 15 10 6 3 25 30 40 20 15 10 6 3 STEREO PARALLEL ­dB 0 ­dB 0 CHANNEL B CHANNEL A 1 1 Volume controls These volume controls allow you to adjust the volume level in 31 steps in the range between ­ dB and 0 dB. [. . . ] max. ) Rated Power into 8 Front Panel Rear Panel Input Output Indicators POWER TEMP PROTECTION (mute) CLIP OUTPUT SIGNAL POWER switch (Push on/Push off) Volume (31 position dB calibrated) Mode switch (STEREO/BRIDGE/PARALLEL) Barrier strip terminal XLR-3-31 type Barrier strip terminal (heatsink temp 85°C) ×2 ×2 POWER switch ON/OFF, Muting, DC detection TEMP (heatsink temp 95°C) RL 1 Low speed (50°C), Variable, High speed (70°C) Connectors Protection Circuits PC limiter Fan Circuits Power Requirements United States & Canada Europe Other 120 V, 60 Hz 230 V, 50 Hz 240 V, 50 Hz 500 W/650 VA 16 kg 400 W/500 VA 15 kg 200 W/250 VA 12 kg 480 × 103. 5 × 455 mm Ventilation panel: VP1 Power Consumption Dimensions (W × H × D) Weight Options 0 dB=0. 775 Vrms, Half Power=1/2 Power Output Level (Rated Power) Specifications subject to change without notice. 8 s Block Diagram SIGNAL Ach Power Amp CHANNEL A CHANNEL A PC Limiter CHANNEL A (BRIDGE) (PARALLEL) G CLIP Temperature Sensor (Heat Sink) CLIP SIGNAL PARALLEL BRIDGE STEREO CHANNEL B Bch Power Amp CHANNEL B PC Limiter Protection Circuit PROTECTION TEMP INPUT SPEAKERS G CHANNEL B s Dimensions 26 61. 2 D:455 4. 4 H:103. 5 379. 6 424 W:480 308 15. 5 88 45 Unit: mm 55. 2 292 9 s Performance Graphs C450 5k Mode:STEREO Both ch Driven RL=4, f=1kHz C320 5k Mode:STEREO Both ch Driven RL=4, f=1kHz Power Consumption [W] 1k Power Consumption [W] 1 10 100 1k 1k 100 100 20 20 1 10 100 1k Output Power [W] Output Power [W] Mode:STEREO Both ch Driven RL=4, f=1kHz C160 5k Power Consumption [W] 1k 100 20 1 10 100 1k Output Power [W] Troubleshooting 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. Indicator Probable Cause There is a short at a speaker terminal, amplifier terminal, or wire. The heat sink temperature has exceed 85°C. Remedy Locate and correct the cause of the short. Use a speaker system with an impedance of at least 4 (stereo) or 8 (bridge). [. . . ]