Gemini-XPM3000-pwr-sm维修电路原理图.pdf

(1) ? XPM-3000 Power Amplifier CONTENTS: Connections Front-to-Rear Forced Air Protection.Short Circuit, DC, Thermal Cut-off, Sub/ultrasonic Frequency Filters, In-rush Current Limiter, Turn-on Delay Connectors: Balanced/Unbalanced Inputs.1/4 Jack Balanced Inputs.XLR Female Jack Line Outputs.1/4 Jack Speaker Outputs (120V unit).5-way binding posts 2 Parallel 5-way binding posts for subwoofers Speaker Outputs (230V unit).Speakons (ch.A, ch.B and subwoofer) Dimensions.19 x 13.75 x 3.5 (483 x 350 x 89 mm) Weight.31 lbs (14 kg) * Specifications and design are subject to change without notice for purpose of improvement. Ouput Power Chart: Impedance Subwoofers A and B Speakers 8 Ohms 8 Ohms Not Used 4 Ohms2 Ohms 4 Ohms Not Used 300 260 220 200 425 380 190 350 270 600 540 165 530 250 220 RadioFans.CN 收音机爱 好者资料库 (8) UNIT DOES NOT PRODUCE SOUND. POWER LED DOES NOT LIGHT. POWER SWITCH NOT IN ON POSITION. POWER CABLE NOT CONNECTED TO AMPLIFIER OR TO OUTLET. AC OUTLET NOT ACTIVE. MAIN AMPLIFIER FUSE DEFECTIVE. MOVE POWER SWITCH TO ON POSITION. CONNECT POWER CABLE TO AC SUPPLY. CHECK CONDITION OF OUTLET. REPLACE AMPLIFIER MAIN POWER FUSE ON REAR PANEL WITH CORRECT TYPE AND RATING. POWER LED LIGHTS, BUT NO SOUND IS PRODUCED BY AMPLIFIER. 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. CHECK FOR PROPER FUNCTION OF INPUT SOURCE DEVICE. CHECK INPUT CABLES AND CONNECTIONS. REPLACE QUESTIONABLE CABLES WITH KNOWN GOOD CABLES. CHECK SPEAKER CABLES AND CONNECTIONS. REPLACE QUESTIONABLE CABLES WITH KNOWN GOOD CABLES. CHECK OPERATING CONDITION AND STATUS OF SPEAKER SYSTEM(S). BE SURE THE LEVEL CONTROLS ARE PROPERLY SET. SOUND IS PRESENT BUT VOLUME IS TOO LOW EVEN THOUGH SOURCE DEVICE IS SET TO A HIGH LEVEL. AMPLIFIER INPUT LEVEL CONTROLS ARE SET TOO LOW. WRONG PIN CONNECTIONS IN CABLES. ADJUST LEVEL CONTROLS AS PER INSTRUCTIONS. USE CORRECT CABLES (AS SHOWN ON BACK OF UNIT). LOUD 50/60 HZ OR 100/120 HZ HUM IS HEARD AT ALL TIMES THROUGH THE SPEAKER SYSTEMS. IMPROPER OR DEFECTIVE GROUND CONNECTION AT INPUTS. IMPROPER OR DEFECTIVE GROUND AT INPUT SOURCE DEVICE(S). IMPROPER OR DEFECTIVE GROUND CONNECTION ON AC OUTLET. GROUND LOOP THROUGH AC LINE CONNECTION/RACK MOUNTING. CHECK FOR PROPER AC LINE GROUND ON POWER AMP AND ALL INPUT DEVICES. CHECK INPUT CABLES FOR ALL SOURCE DEVICES AND SIGNAL PROCESSING AS WELL AS INPUT CABLES TO POWER AMPLIFIER. CHECK POSITION OF GROUND LIFT SWITCH AS PER INSTRUCTIONS FOR LIFTING THE GROUND. NEVER LIFT THE AC LINE GROUND ON THE POWER AMPLIFIER. IF YOU ARE NOT TOTALLY FAMILIAR WITH GROUND LIFTING OR UNIFICATION PROCEDURES, DO NOT ATTEMPT THEM WITHOUT FIRST CONSULTING YOUR DEALER OR A QUALIFIED SOUND TECHNICIAN FOR MORE INFORMATION ON GROUNDING. IMPROPERLY DONE, SUCH PROCEDURES CAN POSE A SAFETY AND/OR FIRE HAZARD. SOUND IS DISTORTED. DISTORTION OCCURRING IN SOURCE DEVICE. INPUT LEVEL IS SET TOO HIGH. CHECK CLIP INDICATORS ON INPUT SOURCE DEVICES AND RESET LEVELS IF NECESSARY TO ELIMINATE DISTORTION. ADJUST LEVEL CONTROLS AS PER INSTRUCTIONS. PROTECT LED REMAINS LIT OR GOES ON AND OFF INTERMITTENTLY AFTER USING AMPLIFIER FOR A SHORT TIME. UNIT IS OPERATING AT EXCESSIVELY HIGH TEMPERATURE. EXTREMELY LOW SPEAKER IMPEDANCE. SHORT IN SPEAKER CONNECTORS, SPEAKER CABLE OR SPEAKER SYSTEM. CHECK THAT AMPLIFIER IS ADEQUATELY VENTILATED ON THE FRONT AND REAR PANELS WHERE THE AIR VENTS AND FANS ARE LOCATED. IF OVERHEATED, LET THE AMPLIFIER COOL DOWN BEFORE APPLYING AN INPUT SIGNAL. VERIFY SPEAKER SYSTEM IMPEDANCES. BE SURE THE TOTAL SPEAKER SYSTEM IMPEDANCE IS AT LEAST 4 OHM PER CHANNEL FOR CHANNELS A AND B, AND AT LEAST 2 OHM FOR THE SUBWOOFER CHANNEL. IF YOU ARE NOT SURE OF YOUR TOTAL SPEAKER IMPEDANCE LOAD, CONTACT YOUR DEALER FOR MORE INFORMATION. CHECK CONDITION OF SPEAKER CABLES. IF USING BARE WIRE CONNECTIONS ON THE OUTPUTS OF THE AMPLIFIER, BE SURE THAT NO STRANDS FROM ONE CONNECTOR ARE TOUCHING ANY OTHER CONNECTOR. FUSE BLOWS INTERMITTENTLY. SPEAKER LOAD IMPEDANCE IS TOO LOW. TYPE OR RATING OF THE FUSE IS NOT CORRECT. CHECK FOR SHORTS ON THE OUTPUTS. CHECK YOUR SPEAKER IMPEDANCE (INFO FROM DEALER). CHECK THAT THE FUSE TYPE AND RATING IS CORRECT. PROTECT LED(S) STAY ON WITH NO SPEAKERS CONNECTED AND WITH THE AMPLIFIER COOLED DOWN. FAILED AMPLIFIER. CONTACT THE GEMINI SERVICE DEPARTMENT OR YOUR AUTHORIZED DEALER TO SPEAK TO A QUALIFIED SERVICE TECHNICIAN. IN THE U.S.A. CALL 1-732-969-9000 SYMPTOMCAUSESOLUTION VERY LITTLE OR NO OUTPUT FROM SUBWOOFER OR NO BASS FROM FULL RANGE SPEAKERS WHEN OPERATING WITHOUT SUBWOOFERS. FREQUENCY SWITCH IS IN THE FULL RANGE MODE POSITION. MOVE THE FREQUENCY SWITCH TO THE 120 HZ OR THE 180 HZ POSITION. 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