Gemini-X4-pwr-sm维修电路原理图.pdf

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1、Page 1 X1 / X2 / X3 / X4 PROFESSIONAL AMPLIFIERS SERVICE MANUAL DiagramsPage 2 Features, Operating Instructions.Page 3 Specifications.Page 5 Troubleshooting.Page 6 Parts List.Page 7 Schematics.Page 20 RadioFans.CN 收音机爱 好者资料库 Page 2 X4 X1 / X2 / X3 17 RadioFans.CN 收音机爱 好者资料库 Page 3 Rear panel Input S

2、ection: 1/4 Phone lnput Jacks (1, 2): accept a balanced as well as an unbalanced line level signal. The unbalanced line uses a standard tip-sleeve connection. The tip is positive and the sleeve is negative or ground. The balanced line uses a tip-ring-sleeve connection. Tip is hot or positive (+), ri

3、ng is cold or negative (-), and sleeve is shield or ground. Operation Mode Switch (3): switch is used to set the unit for Stereo mode, Parallel Mono mode or Mono Bridge mode. AC Power Section: Fuse (8): replace fuse with those of proper type and rating. Ground Lift Switch (4) is used to lift the gro

4、und from the chassis, see the Ground Lift Switch Instructions for more detail. AC Inlet (16) is used to attach the power cord to the unit. AC line voltage switch (17) allows reconfiguring amplifier for either 110-120V or 220-240V AC lines. Output Section: Disconnect unit from the AC power source bef

5、ore making any connections. Pay close attention to polarity (shown on the back of the unit) when connecting your speakers. Connecting your speaker systems using the wrong polarity will not damage your speakers, but will impact the quality of the sound (lack of bass and incorrect stereo image). Speak

6、er Outputs (5,6,7): the speaker output connectors are 3-way binding posts that will accept a standard banana plug, spade lugs, or bare wire. Make sure that all the connections are clean when using bare wire connections. If any strands of wire from one connector touch the adjacent connector, the soun

7、d will distort, and your amplifier will overheat and go into protection mode. NOTE: Total speaker impedance must not be lower than 4 Ohm per channel for Stereo and Parallel Mono modes, and 8 Ohm for Mono Bridge mode. Front Panel Power Switch (9) : turns the unit on and off. Power LED (10): the power

8、 LED lights when the power is on. If the power LED does not light, refer to the troubleshooting guide. Signal LED (13): the signal LEDs for each channel show when a signal is present. In Mono Bridge mode, both the channel 1 LED and the channel 2 LED will light in unison. Clip LED (14): the amplifier

9、 has true clip LEDs to help you properly control the amplifiers output and achieve undistorted sound. The clip LEDs for each channel light when your signal level is so strong that the distortion occurs. The clip LED should not remain constantly on or flash repeatedly during operation. For clean soun

10、d reproduction, the clip LED should only light occasionally for an instant. If the LED remains on or flashes repeatedly, you will hear distorted sound that can be damaging to your speaker systems. If this occurs, reduce the signal level by lowering the input level control for the channel that is cli

11、pping or reduce the level at the source. If the clip LED lights when no signal is present, it may indicate an RF signal on the output which may cause damage to speakers (the RF signal will not be audible). Please note that when you are using the amplifier in the Mono Bridge mode, both clip LEDs of t

12、he bridged channels will operate simultaneously. Protect LED (11): when you first turn on the amplifier, the protect LEDs light briefly during a turn-on delay which indicates that the outputs are disconnected internally. There will be an audible click when the outputs reconnect and the protect LED w

13、ill turn off. Otherwise, the protect LED indicates that there is a problem either in the amplifiers external connections, load or temperature conditions or its internal INTRODUCTION Congratulations on purchasing a Gemini Power Amplifier. This state of the art power arnplifier includes the latest fea

14、tures and is backed by a three year limited warranty. Prior to use, we suggest that you carefully read all the instructions. FEATURES State of the art bi-polar output stage technology for the finest sound quality and reliability High output power to drive professional loudspeakers without clipping C

15、omprehensive protection circuity (Short Circuit, DC, Thermal Cut-off, Sub/Ultrasonic Frequency Filters, Turn-on Delay, Main Fuse, Secondary DC Fuses) Three modes of operation - stereo, parallel mono and mono bridge Active 1/4 Jack balanced/unbalanced inputs Ground lift switch for flexibility in inst

16、allations Signal LEDs and Clip LEDs for better control on X1, X2, X3 amplifers Large VU-meters and Clip LEDs for better control on X4 amplifier Efficient dual aluminum extrusion heatsink design with directly mounted output transistors for no-fault operation Efficient air guide with front-to-rear air

17、flow for thermal stability and reliability Compact 2U well balanced enclosure (3U for X4 model) Steel reinforced chassis construction for durability and longevity WORDS TO THE WISE 1. Read all operating instructions before using this equipment. 2. To reduce the risk of electrical shock, do not open

18、the unit. There are NO USER REPLACEABLE PARTS INSIDE. Please contact the Gemini Service Department or your authorized dealer to speak to a qualified Gemini Sound Products technician. 3. Be sure to allow adequate front and rear ventilation to avoid possible heat damage to your equipment. 4. Be sure t

19、hat AC power is OFF and all level controls are set to MINIMUM before making connections. This will eliminate any chance of unexpected, loud audio transients that could damage your speaker systems. In the USA: If you experience problems with this unit, please call 1 (732) 738-9003 for Gemini Customer

20、 Service. Do not attempt to return this equipment to your dealer. 5. Be sure that AC power is OFF when changing modes of operation and when changing the position of the ground lift switch. 6. DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. Operators of electronic equipment should in no way be in contac

21、t with water. 7. When connecting to AC power line be sure you havent lost the ground connection by using an adapter or extension cord without a 3 prong plug. 8. DO NOT USE ANY SPRAY CLEANER OR LUBRICANT ON ANY CONTROLS OR SWITCHES. CONNECTION, CONTROLS AND INDICATORS RadioFans.CN 收音机爱 好者资料库 Page 4 f

22、unctions. If one of these situations occurs, the amplifier senses the problem and automatically switches into protection mode. The LED will light to warn you of the trouble and the amplifier will stop working. If this occurs, switch off the amplifier and refer to the Troubleshooting Guide. If the pr

23、otect LED remains lit when resuming amplifier operation, do not use the amplifier and contact an authorized service technician. Level Controls (12,15): establish the input levels required for each channel. Only the Channel 1 Level Control (15) works in Mono Bridge mode. OPERATION THE AMPLIFIERS POWE

24、R MUST BE TURNED OFF WHEN CHANGING MODES OF OPERATION. Stereo Operation The unit has two channels for stereo operation. Each channel provides a separate and discrete signal at the speaker outputs according to the signal received at the inputs. The following instructions are for applications with 4 O

25、hm or 8 Ohm speakers of matched power ratings. 1. With the power off, set the OPERATION MODE SWITCH (3) to the STEREO position. 2. With the power off, connect your input cables to the channel 1 and 2 inputs using the 1/4 INPUT JACKS (1, 2) of each channel. 3. Connect the loudspeakers to the channel

26、1 and channel 2 SPEAKER OUTPUTS (5,7). THE TOTAL SPEAKER LOAD MUST BE AT LEAST 4 OHMS PER CHANNEL. If you try to operate at a lower impedance, the amplifier will go into protection mode and stop operation until you correct the load conditions. 4. With the LEVEL CONTROLS (12,15) of both channels set

27、to zero (fully counterclockwise), turn the POWER SWITCH (9) on. Apply a signal to the input of the amplifier. The level of the input signal should be as high as you will ever need it to be. This way, it will be as high above the amplifiers noise floor as possible, ensuring an excellent performance a

28、nd signal to noise ratio. Adjust the LEVEL CONTROLS for each channel to achieve the desired maximum listening level. Note, when the clip LEDs light, there is distortion present in the amplifiers output section. If a clip LED remains on or flashes repeatedly, reduce the signal level by lowering the i

29、nput level control for the channel that is clipping or reduce the level at the source. Parallel Mono Operation Follow these instructions for Parallel Mono Operation using a single input cable, and you will have the same monophonic signal on both the channel 1 and the channel 2 outputs. Each channels

30、 output is controlled independently by that channels level control. 1. With the power off, set the OPERATION MODE SWITCH (3) to the PARALLEL Mono position. 2. With the power off, connect your input cables to the channel 1 input only using the 1/ 4 INPUT JACK (1) of channel 1. 3. Connect the loudspea

31、kers to the channel 1 and channel 2 SPEAKER OUTPUTS (5, 7). THE TOTAL SPEAKER LOAD MUST BE AT LEAST 4 OHMS PER CHANNEL. If you try to operate at less than 4 Ohms per channel, the amplifier will go into the protection mode and stop operation until you correct the load conditions. 4. With the LEVEL CO

32、NTROLS (12,15) set to zero (fully counterclockwise), switch the power on. Apply a signal to the input. The level of the input signal should be as high as you will ever need it to be. This way, it will be as high above the amplifiers noise floor as possible, ensuring an excellent performance and sign

33、al to noise ratio. Adjust the LEVEL CONTROLS for each channel to achieve the desired maximum listening level. Note, when the clip LEDs light, there is distortion present in the amplifiers output section. If a clip LED remains on or flashes repeatedly, reduce the signal level by lowering the input le

34、vel control for the channel that is clipping or reduce the level at the source. Mono Bridge Operation Follow these instructions to bridge the units output. Bridging the amplifier converts the unit to a monophonic or single channel amplifier. The amplifier can be used with 8 Ohm or higher loads only

35、in Mono Bridge mode. This mode is used to provide a higher voltage with greater headroom to your speaker. Before setting your amplifier for Mono Bridge operation, make sure that your speaker can handle the high power level provided by the amplifier in Mono Bridge mode. CAUTION: VOLTAGE OVER 100 VOLT

36、S MAY BE PRODUCED AT THE BRIDGE OUTPUT TERMINALS IN THIS MODE. 1. With the power off, set the OPERATION MODE SWITCH (3) to the BRIDGE position. 2. With the power off, connect your input cables to channel 1 input only using the 1/4 INPUT JACK (1) of channel 1. 3. Connect the loudspeaker to the BRIDGE

37、 SPEAKER OUTPUT (6) only. Be sure the polarity of your connection is correct. The total speaker load must be at least 8 Ohms or above. If you try to operate at less than 8 Ohms in the Mono Bridge mode, the amplifier will go into the protection mode and stop operation until you correct the load condi

38、tions. 4. With the CHANNEL 1 LEVEL CONTROL (15) set to zero (fully counterclockwise), switch the power on. Apply a signal to the input. The level of the input signal should be as high as you will ever need it to be. This way, it will be as high above the amplifiers noise floor as possible, ensuring

39、an excellent performance and signal to noise ratio. Adjust the LEVEL CONTROL (15) for channel 1 to achieve the desired maximum listening level. Note, when the clip LEDs light, there is distortion present in the amplifiers output section. If a clip LED remains on or flashes repeatedly, reduce the sig

40、nal level by lowering the input level control for channel 1 or reduce the level at the source. During Mono Bridge operation, the channel 2 level is inactive, however, both channels LEDs will flash simultaneously and show output conditions. Using the Ground Lift Switch Depending on your system config

41、uration, sometimes applying the ground will create a quieter signal path. Sometimes lifting the ground can eliminate ground loops and hum to create a quieter signal path. 1. With the power amp on, listen to the system in idle mode (no signal present) with the ground applied (the GROUND LIFT SWITCH (

42、4) in the left position). 2. Turn the power off before moving the GROUND LIFT SWITCH (4). Lift the ground by moving the GROUND LIFT SWITCH to the right, turn the power back on and listen to determine which position will provide a signal free of background noise and hum. Keep the GROUND LIFT SWITCH i

43、n the ground position if the noise level remains the same in either position. CAUTION: DO NOT TERMINATE THE AC GROUND ON THE POWER AMPLIFIER IN ANY WAY. TERMINATION OF THE AC GROUND CAN BE HAZARDOUS. RadioFans.CN 收音机爱 好者资料库 Page 5 SPECIFICATIONS X1X2X3X4 Output Power EIA: 1kHz 1% THD, Wrms Both Chan

44、nels Driven 885140200200 Both Channels Driven 4110200300300 Mono Bridge 8220400600600 Dynamic Headroom, dB: At81.41.51.61.6 At41.92.02.22.2 Frequency Response . 30 Hz - 50 kHz Total Harmonic Distortion . Iess than 0.05%, typical 0.02% at 1 kHz Signal to Noise ratio . 100 dB below rated power 8 Dampi

45、ng factor. greater than 200 8 Slew rate . 20 V/S Voltage gain, dB28303232 Input Sensitivity (for rated power at 8 ) . 1 Vrms Input Impedance Unbalanced .10 k Input Impedance Balanced .20 k Power consumption, W50080012001200 (at rated power at 4, both channels driven) AC Power Requirements . 110-120

46、V / 60 Hz and 220-240 V / 50 Hz Indicators . 1 Power LED 1 Protect LED 1 Signal LED per Channel (for X1, X2, X3) 1VU-meter per Channel (for X4) Cooling .Fan, Front-to-Rear Forced Air Protection .Short Circuit, DC, Thermal Cut-off, Sub/Ultrasonic Frequency Filters, Turn-on Delay, Main Fuse, Secondary

47、 DC Fuses Connectors: Balanced/ Unbalanced lnputs. 1/4 Jack Speaker Outputs . 5-way Binding Posts Dimensions: X1, X2, X3 .19W x 10.75D x 3.5H (483 x 273 x 89 mm) X4 .19W x 10.75D x 5.25H (483 x 273 x 133 mm) Weight16.3 Ibs 17.8 Ibs 20.2 Ibs 21.6 Ibs 7.4 kg8.1 kg9.2 kg9.8 kg *Specifications and design are subject to change without notice for purpose of improvement RadioFans.CN 收音机爱 好者资料库 Page 6 SYMPTOM UNIT DOES NOT PRODUCE SOUND. POWER LED DOES NOT L