YORKVILLE Audiopro 3400 Service Manual

Also see for Audiopro 3400: Owner's manual Service manual

Contents

YORKVILLE Audiopro 3400 Service Manual Manual pdf 7 page image

10STEP 3: POWER UP PROCEDURE WITHOUT M1002A BOARDSIt is extremely important that you never power up an AP3400 with the interconnecting cablesbetween the circuitboards not connected.Time and possible further damage will be reduced if you test M1011A and M1002A boards separately. To do this youmust use the M1011A and M1002A test connecters. These are shown in figures #5 and #6. These can be made if theMolex connector parts are available or order them from the Yorkville Service Parts Dept. With the test connectorsconnected to every board, slowly variac up the line AC voltage.NOTE: It may be simplier to remove the power supply connections to M1002A boards not being troubleshooted toreduce the possibility of further damage. With the M1011A test connector connected, a sinewave can be passedthrough the board and be seen on test points 5 and 6. With the M1002 Atest connector installed, static DCmeasurements can be made. A slight DC offset may be present on the board?s output as there will not be any DCcorrecting feedback.STEP 4: DISMANTLING AND REASSEMBLY PRECAUTIONSA. When removing power supply wires or resoldering wires to eyelets on the M1011A board, double check that thereare no solder bridges or icicles bridging traces or other eyelets. Failure to do so will result in the destruction ofnewly installed boards as well as other boards in the unit. Also make sure wire color codes are correctly orientedin their proper eyelets, and be careful that ribbon cables don?t get pinched or cut under the M1011A board.B. When reinstalling M1002A boards, make sure the output wires, i.e. the red and yellow signal and black groundwires, are not reversed. If either or both channels are reversed, the amp will stay in protect mode with the redprotect LED staying on or sampling on and off.11SPECIFICATIONSPOWER• All values are in WATTS at 1KHz, except FTC 20Hz-20KHz.• Measurements made with regulated 120 VAC sine wave at line cord.• All values are rounded down to the nearest 25 wattsBURST AVERAGEMeasured as a 2 cycle burst at 1KHz, 8:1 duty. (Continuous measurements may require line currents >15 Amps).ONE CHANNEL DRIVEN (WATTS).LOAD CONT. AVG. BURST AVG. PEAK INSTANT FTC 20-20KHz8ohms900 1250 3000 8004ohms1500 2250 6000 1200BOTH CHANNELS DRIVEN (WATTS).LOAD CONT. AVG. BURST AVG. PEAK INSTANT FTC 20-20KHz8ohms750 1200 3000 6504ohms1200 2175 6000 950BRIDGED (WATTS)LOAD CONT. AVG. BURST AVG. PEAK INSTANT FTC 20-20KHz16ohms1500 2400 6000 13008ohms2400 4350 12000 1900THD DISTORTIONLOAD AT 1KHz 20Hz - 20KHz8 ohms <0.003 % <0.04 %4 ohms <0.004% <0.05 %CROSSTALK: -75 dB below full power at 1KHz-60 dB below full power, 20Hz - 20KHzINPUT IMPEDANCE: 20K ohms balanced, 10 Kohms unbalancedINPUT SENSITIVITY: 1.4 VRMS sine wave = full power (36 dB gain).FREQUENCY RESPONSE: Within 1dB, 20Hz to 20KHz (50Hz boost sw out)HUM AND NOISE: -105 dB below max output RMS voltage, unweightedDC OFFSET: less than 25 millivoltsPROTECTION: fully protected, DC, LOAD and THERMALCOOLING: interleaved heatsink with DC servo controlled fanSLEW RATE: Power amp: 30 V/usec, 60 V/usec in bridged mode(rise time limited to 18 V/usec by input filter).DAMPING FACTOR: >500, 20Hz - 400Hz, into 8 ohmsMAX OUTPUT CURRENT: 100 amperes for 10 milliseconds, 50 amperes continuousTURN ON/OFF: < 15 milliwatts / seconds, 0.5 Wpk (1s on delay).EFFICIENCY: Better than 75% at full power into 4 ohmsWEIGHT: 42 pounds 17.75 KilogramsSIZE: 3.5" x 19" x 15.75" (front panel to binding posts)POWER SUPPLY: Toroidal transformer and combinationpower switch/circuit breakerPOWER COMSUMPTION: Will not exceed 13.5 Amps under actual conditions