Gemini-X1-pwr-sm维修电路原理图.pdf

Page 1X1 / X2 / X3 / X4PROFESSIONAL AMPLIFIERSSERVICEMANUALDiagramsPage 2Features, Operating Instructions.Page 3Specifications.Page 5Troubleshooting.Page 6Parts List.Page 7Schematics.Page 20RadioFans.CN 收音机爱 好者资料库Page 2 X4X1 / X2 / X317RadioFans.CN 收音机爱 好者资料库Page 3Rear panelInput Section:1/4 Phone lnput Jacks (1, 2): accept a balanced as well as anunbalanced line level signal. The unbalanced line uses astandard tip-sleeve connection. The tip is positive and the sleeveis negative or ground. The balanced line uses a tip-ring-sleeveconnection. Tip is hot or positive (+), ring is cold or negative (-),and sleeve is shield or ground.Operation Mode Switch (3): switch is used to set the unit for Stereomode, 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 ground from the chassis, seethe 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 either110-120V or 220-240V AC lines.Output Section:Disconnect unit from the AC power source before making anyconnections. Pay close attention to polarity (shown on the back of theunit) when connecting your speakers. Connecting your speakersystems using the wrong polarity will not damage your speakers, butwill impact the quality of the sound (lack of bass and incorrect stereoimage).Speaker Outputs (5,6,7): the speaker output connectors are 3-waybinding posts that will accept a standard banana plug, spade lugs,or bare wire. Make sure that all the connections are clean whenusing bare wire connections. If any strands of wire from oneconnector touch the adjacent connector, the sound will distort, andyour amplifier will overheat and go into protection mode.NOTE: Total speaker impedance must not be lower than4 Ohm per channel for Stereo and Parallel Mono modes,and 8 Ohm for Mono Bridge mode.Front PanelPower Switch (9) : turns the unit on and off.Power LED (10): the power LED lights when the power is on. If thepower LED does not light, refer to the troubleshooting guide.Signal LED (13): the signal LEDs for each channel show when a signalis present. In Mono Bridge mode, both the channel 1 LED and thechannel 2 LED will light in unison.Clip LED (14): the amplifier has true clip LEDs to help you properlycontrol the amplifiers output and achieve undistorted sound. Theclip LEDs for each channel light when your signal level is so strongthat the distortion occurs. The clip LED should not remainconstantly on or flash repeatedly during operation. For clean soundreproduction, the clip LED should only light occasionally for aninstant. If the LED remains on or flashes repeatedly, you will heardistorted sound that can be damaging to your speaker systems. Ifthis occurs, reduce the signal level by lowering the input levelcontrol for the channel that is clipping or reduce the level at thesource. If the clip LED lights when no signal is present, it mayindicate an RF signal on the output which may cause damage tospeakers (the RF signal will not be audible). Please note that whenyou are using the amplifier in the Mono Bridge mode, both clip LEDsof the bridged channels will operate simultaneously.Protect LED (11): when you first turn on the amplifier, the protect LEDslight briefly during a turn-on delay which indicates that the outputsare disconnected internally. There will be an audible click when theoutputs reconnect and the protect LED will turn off. Otherwise, theprotect LED indicates that there is a problem either in the amplifiersexternal connections, load or temperature conditions or its internalINTRODUCTION Congratulations on purchasing a Gemini Power Amplifier. This stateof the art power arnplifier includes the latest features and is backedby a three year limited warranty. Prior to use, we suggest that youcarefully read all the instructions.FEATURES State of the art bi-polar output stage technology for the finest soundquality and reliability High output power to drive professional loudspeakers without clipping Comprehensive 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 installations 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 directlymounted output transistors for no-fault operation Efficient air guide with front-to-rear airflow for thermal stability andreliability Compact 2U well balanced enclosure (3U for X4 model) Steel reinforced chassis construction for durability and longevityWORDS TO THE WISE1. Read all operating instructions before using this equipment.2. To reduce the risk of electrical shock, do not open the unit. Thereare NO USER REPLACEABLE PARTS INSIDE. Please contact theGemini Service Department or your authorized dealer to speak to aqualified Gemini Sound Products technician.3. Be sure to allow adequate front and rear ventilation to avoidpossible heat damage to your equipment.4. Be sure that AC power is OFF and all level controls are set toMINIMUM before making connections. This will eliminate any chanceof unexpected, loud audio transients that could damage yourspeaker systems. In the USA: If you experience problems with this unit, please call 1 (732) 738-9003 for Gemini Customer Service. Do not attempt to return this equipment to your dealer.5. Be sure that AC power is OFF when changing modes of operationand when changing the position of the ground lift switch.6. DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. Operators ofelectronic equipment should in no way be in contact with water.7. When connecting to AC power line be sure you havent lost theground connection by using an adapter or extension cord without a3 prong plug.8. DO NOT USE ANY SPRAY CLEANER OR LUBRICANT ON ANYCONTROLS OR SWITCHES.CONNECTION, CONTROLSAND INDICATORSPage 4functions. If one of these situations occurs, the amplifier sensesthe problem and automatically switches into protection mode. TheLED will light to warn you of the trouble and the amplifier will stopworking. If this occurs, switch off the amplifier and refer to theTroubleshooting Guide. If the protect LED remains lit when resumingamplifier operation, do not use the amplifier and contact anauthorized service technician.Level Controls (12,15): establish the input levels required for eachchannel. Only the Channel 1 Level Control (15) works in MonoBridge mode.OPERATIONTHE AMPLIFIERS POWER MUST BE TURNED OFF WHEN CHANGINGMODES OF OPERATION.Stereo OperationThe unit has two channels for stereo operation. Each channelprovides a separate and discrete signal at the speaker outputsaccording to the signal received at the inputs. The following instructionsare for applications with 4 Ohm or 8 Ohm speakers of matched powerratings.1. With the power off, set the OPERATION MODE SWITCH (3) to theSTEREO position.2. With the power off, connect your input cables to the channel 1 and 2inputs using the 1/4 INPUT JACKS (1, 2) of each channel.3. Connect the loudspeakers to the channel 1 and channel 2 SPEAKEROUTPUTS (5,7). THE TOTAL SPEAKER LOAD MUST BE AT LEAST 4OHMS PER CHANNEL. If you try to operate at a lower impedance, theamplifier will go into protection mode and stop operation until youcorrect the load conditions.4. With the LEVEL CONTROLS (12,15) of both channels set to zero(fully counterclockwise), turn the POWER SWITCH (9) on. Apply asignal to the input of the amplifier. The level of the input signal shouldbe as high as you will ever need it to be. This way, it will be as highabove the amplifiers noise floor as possible, ensuring an excellentperformance and signal to noise ratio. Adjust the LEVEL CONTROLSfor each channel to achieve the desired maximum listening level.Note, when the clip LEDs light, there is distortion present in theamplifiers output section. If a clip LED remains on or flashesrepeatedly, reduce the signal level by lowering the input level controlfor the channel that is clipping or reduce the level at the source.Parallel Mono OperationFollow these instructions for Parallel Mono Operation using a singleinput cable, and you will have the same monophonic signal on both thechannel 1 and the channel 2 outputs. Each channels output iscontrolled independently by that channels level control.1. With the power off, set the OPERATION MODE SWITCH (3) to thePARALLEL Mono position.2. With the power off, connect your input cables to the channel 1 inputonly using the 1/ 4 INPUT JACK (1) of channel 1.3. Connect the loudspeakers to the channel 1 and channel 2 SPEAKEROUTPUTS (5, 7). THE TOTAL SPEAKER LOAD MUST BE AT LEAST 4OHMS PER CHANNEL. If you try to operate at less than 4 Ohms perchannel, the amplifier will go into the protection mode and stopoperation until you correct the load conditions.4. With the LEVEL CONTROLS (12,15) set to zero (fullycounterclockwise), switch the power on. Apply a signal to the input.The level of the input signal should be as high as you will ever needit to be. This way, it will be as high above the amplifiers noise flooras possible, ensuring an excellent performance and signal to noiseratio. Adjust the LEVEL CONTROLS for each channel to achieve thedesired maximum listening level. Note, when the clip LEDs light, thereis distortion present in the amplifiers output section. If a clip LEDremains on or flashes repeatedly, reduce the signal level by loweringthe input level control for the channel that is clipping or reduce thelevel at the source.Mono Bridge OperationFollow these instructions to bridge the units output. Bridging theamplifier converts the unit to a monophonic or single channel amplifier.The amplifier can be used with 8 Ohm or higher loads only in MonoBridge mode. This mode is used to provide a higher voltage withgreater headroom to your speaker. Before setting your amplifier forMono Bridge operation, make sure that your speaker can handle thehigh power level provided by the amplifier in Mono Bridge mode.CAUTION: VOLTAGE OVER 100 VOLTS MAY BE PRODUCED AT THEBRIDGE OUTPUT TERMINALS IN THIS MODE.1. With the power off, set the OPERATION MODE SWITCH (3) to theBRIDGE position.2. With the power off, connect your input cables to channel 1 input onlyusing the 1/4 INPUT JACK (1) of channel 1.3. Connect the loudspeaker to the BRIDGE SPEAKER OUTPUT (6) only.Be sure the polarity of your connection is correct. The total speakerload must be at least 8 Ohms or above. If you try to operate at lessthan 8 Ohms in the Mono Bridge mode, the amplifier will go into theprotection mode and stop operation until you correct the loadconditions.4. With the CHANNEL 1 LEVEL CONTROL (15) set to zero (fullycounterclockwise), switch the power on. Apply a signal to the input.The level of the input signal should be as high as you will ever needit to be. This way, it will be as high above the amplifiers noise flooras possible, ensuring an excellent performance and signal to noiseratio. Adjust the LEVEL CONTROL (15) for channel 1 to achieve thedesired maximum listening level. Note, when the clip LEDs light, thereis distortion present in the amplifiers output section. If a clip LEDremains on or flashes repeatedly, reduce the signal level by loweringthe 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 showoutput conditions.Using the Ground Lift SwitchDepending on your system configuration, sometimes applying theground will create a quieter signal path. Sometimes lifting the groundcan 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 signalpresent) with the ground applied (the GROUND LIFT SWITCH (4) inthe left position).2. Turn the power off before moving the GROUND LIFT SWITCH (4). Liftthe ground by moving the GROUND LIFT SWITCH to the right, turn thepower back on and listen to determine which position will provide asignal free of background noise and hum. Keep the GROUND LIFTSWITCH in the ground position if the noise level remains the same ineither position.CAUTION: DO NOT TERMINATE THE AC GROUND ON THE POWERAMPLIFIER IN ANY WAY. TERMINATION OF THE AC GROUND CANBE HAZARDOUS.Page 5SPECIFICATIONSX1X2X3X4Output Power EIA: 1kHz 1% THD, WrmsBoth Channels Driven 885140200200Both Channels Driven 4110200300300Mono Bridge 8220400600600Dynamic Headroom, dB:At81.41.51.61.6At41.92.02.22.2Frequency Response . 30 Hz - 50 kHzTotal Harmonic Distortion . Iess than 0.05%, typical 0.02% at 1 kHzSignal to Noise ratio . 100 dB below rated power 8Damping factor. greater than 200 8Slew rate . 20 V/SVoltage gain, dB28303232Input Sensitivity (for rated power at 8 ) . 1 VrmsInput Impedance Unbalanced .10 kInput Impedance Balanced .20 kPower consumption, W50080012001200(at rated power at 4,both channels driven)AC Power Requirements . 110-120 V / 60 Hz and 220-240 V / 50 HzIndicators . 1 Power LED 1 Protect LED1 Signal LED per Channel (for X1, X2, X3)1VU-meter per Channel (for X4)Cooling .Fan, Front-to-Rear Forced AirProtection .Short Circuit, DC, Thermal Cut-off,Sub/Ultrasonic Frequency Filters, Turn-on Delay, Main Fuse, Secondary DC FusesConnectors:Balanced/ Unbalanced lnputs. 1/4 JackSpeaker Outputs . 5-way Binding PostsDimensions: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 Ibs7.4 kg8.1 kg9.2 kg9.8 kg*Specifications and design are subject to change without notice forpurpose of improvementPage 6SYMPTOMUNIT DOES NOT PRODUCE SOUND. POWERLED DOES NOT LIGHT.POWER LED LIGHTS, BUT NO SOUND IS PRODUCEDBY AMPLIFIER.SOUND IS PRESENT BUT VOLUME IS TOO LOWEVEN THOUGH SOURCE DEVICE IS SET TO A HIGHLEVEL.LOUD 50/60 HZ OR 100/120 HZ HUM IS HEARD ATALL TIMES THROUGH THE SPEAKER SYSTEMS.SOUND IS DISTORTED.PROTECT LED REMAINS LIT OR GOES ON AND OFFINTERMITTENTLY AFTER USING AMPLIFIER FOR ASHORT TIME.FUSE BLOWS INTERMITTENTLY.PROTECT LED STAYS ON WITH NOSPEAKERS CONNECTED AND WITH THEAMPLIFIER COOLED DOWN.CAUSE POWER SWITCH NOT IN ON POSITION. POWER CABLE NOT CONNECTED TO AMPLIFIEROR TO OUTLET. AC OUTLET NOT ACTIVE. MAIN AMPLIFIER FUSE DEFECTIVE NO INPUT SOURCE SIGNAL. INPUT SOURCE NOT CONNECTED. INPUT CONNECTING CABLE DEFECTIVE. SPEAKER(S) NOT CONNECTED. SPEAKER CABLE DEFECTIVE. SPEAKER SYSTEM(S) INOPERATIVE. AMPLIFIERS LEVEL CONTROLS ARE SET TO ZERO AMPLIFIER INPUT LEVEL CONTROLS ARE SET TOO LOW. WRONG PIN CONNECTIONS IN CABLES. IMPROPER OR DEFECTIVE GROUND CONNECTION ATINPUTS. IMPROPER OR DEFECTIVE GROUND AT INPUTSOURCE DEVICE(S). IMPROPER OR DEFECTIVE GROUND CONNECTIONON AC OUTLET. GROUND LOOP THROUGH AC LINE CONNECTION/RACKMO