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Фрагмент инструкции
The CFT-1800 utilizes quiet convection cooling for studio control rooms, home hi-fi, and other applications where low ambient noise is essential. Like the FTX Series III, the CFT-1800 is a modular design for ease of servicing. Because of the passive cooling in the CFT1800, thermal headroom is somewhat reduced from that of forced air cooling, thus making it inadvisable to drive 4 ohm loads at continuous high power with this amplifier. It is also important to allow for free air circulation above and below the amplifier to achieve optimum cooling action. Operating Manual - FTX-1001, FTX-1501, FTX-2001, CFT-1800 Power Amplifier 11. TROUBLESHOOTING TIPS 11.1 No Audio Output Power switch not lit: Line fuse is blown or power outlet is dead. IF LINE FUSE IS BLOWN, REPLACE ONLY WITH SAME TYPE AND RATING FUSE. Power switch is lit but thermal status LEDs are off: Amp is in thermal protect mode. Power has been removed from the audio section until the amplifier returns to a normal temperature. Power and Thermal Status are lit but Output Level Meters are not responding: There is no input signal applied or input level controls are off. Note: In parallel mono mode, be sure that only one signal source is connected to the amp. Protect LED is lit and relay clicking is heard: Output is short circuited or load impedance is too low. Check speaker cables for shorts, increase load impedance by disconnecting some speakers. A high frequency oscillation in the sound system is occuring when the relays close. Turn down the input level controls to verify that the amplifier alone is not causing the problem. Be sure to use good quality shielded and balanced input cables. Do not run input cables alongside output speaker wires over long lengths (ie. through the same conduit). Protect LED is lit, Clip LED comes on as soon as signal is applied: DC voltage may be present on the output or an internal slow acting protection fuse may have blown. Have a qualified technician replace the fuse with the same type fuse. 11.2 Distorted Sound Output level meters indicate 0dB level (red CLIP LED on): Amplifier is being clipped. Reduce the signal level at the signal source. 0 dB level on output meters is never reached: Applied input signal is distorted before it gets to the amp. Check to see if a piece of equipment in the signal chain before the amp is clipping. Normally the amplifier should be operated with input levels fully CW to maximize headroom in the signal source. Also check for damaged speaker drivers that could cause distorted sound. If distorted sound is still heard, there may be an internal problem. Call Ashly Audio service department at 800-828-6308. 11.3 Hum or Buzz Noise Be sure that the power cord’s 3-prong plug is connected to a properly earth-grounded outlet. Lifting the grounding third prong usually does not improve hum or buzz and creates a potential electrical shock hazard. Use balanced input connections with a balanced audio source for best hum and buzz rejection. See section 7.1 on inputs. Normally the ground lift strap on the input screw terminals should be left in place for best ground voltage suppression. In some cases hum or buzz noise may be induced by excessive ground current through the input ground connection. This current path may be interrupted by removing the ground lift strap. If the problem persists, input signal transformers providing complete ground isolation are available. See section 8.1 on Input Isolation Transformer. Buzz noise can be caused by lighting dimmers or neon lights. Try moving the amplifier, wiring, or lighting to different location to see if lighting is the source of the buzz. Input transformers may also fix the problem. See section 8.1 on Input Isolation Transformer. 12. DIMENSIONS Operating Manual - FTX-1001, FTX-1501, FTX-2001, CFT-1800 Power Amplifier 13. SPECIFICATIONS Operating Manual - FTX-1001, FTX-1501, FTX-2001, CFT-1800 Power Amplifier 13.1 Output Power Maximum Average Power, 0.1% THD, 1KHz RMS Watts Per Channel, Both Channels Driven FTX-1001 FTX-1501 FTX-2001 8 ohms: 120W 200W 300W 4 ohms: 175W 300W 500W 2 ohms: ---380W 675W Bridged Mono Mode: 8 ohms: 350W 600W 1000W 4 ohms: ---760W 1350W FTC Continuous Power, 0.1% THD, 20Hz-20KHz RMS Watts Per Channel, Both Channels Driven 8 ohms: 120W 190W 290W 4 ohms: 170W 280W 475W Bridged Mono Mode: 8 ohms: 340W 560W 950W 13.2 Frequency Response: ±0.2dB 20Hz - 20KHz 13.3 Total Harmonic Distortion: .007% 1KHz, 8. .01% 20Hz 8. .05% 20Hz-20KHz 8. 13.4 IM Distortion (SMPTE): .007% 8. (IHF): .01% 8. 13.5 Output Hum And Noise: (dB below full output 20Hz - 20KHz, unweighted) >100dB >100dB >105dB 13.6 Damping Factor: >250 into 8W, <1KHz 13.7 Full Power Input Sensitivity: 1 Vrms 1.3Vrms 1.7Vrms 13.8 Voltage Gain: 28. = 29dB 13.9 Input Impedance: 20KW balanced 13.10 Bandwidth 100KHz 13.11 Slew Rate 50V/mS 13.12 Rise Time 2mS 10%-90% 13.13 Power Require110-125VAC, 50ments -60Hz (240V Available) 13.14 Shipping Weight: 41 lbs. 46lbs. 60lbs. Specification conditions ...
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