STEP 3: POWER UP PROCEDURE WITHOUT M1002A BOARDS
It is extremely important that you never power up an AP3400 with the interconnecting cablesbetween the circuit boards not connected.
Time and possible further damage will be reduced if you test M1011A and M1002A boards separately. To do this you must use the M1011A and M1002A test connecters. These are shown in figures #5 and #6. These can be made if the Molex connector parts are available or order them from the Yorkville Service Parts Dept. With the test connectors connected 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 to reduce the possibility of further damage. With the M1011A test connector connected, a sinewave can be passed through the board and be seen on test points 5 and 6. With the M1002 Atest connector installed, static DC measurements can be made. A slight DC offset may be present on the board?s output as there will not be any DC correcting feedback.
STEP 4: DISMANTLING AND REASSEMBLY PRECAUTIONS
A.When removing power supply wires or resoldering wires to eyelets on the M1011A board, double check that there are no solder bridges or icicles bridging traces or other eyelets. Failure to do so will result in the destruction of newly installed boards as well as other boards in the unit. Also make sure wire color codes are correctly oriented in 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 ground wires, are not reversed. If either or both channels are reversed, the amp will stay in protect mode with the red protect LED staying on or sampling on and off.
SPECIFICATIONS
POWER
•All values are in WATTS at 1KHz, except FTC
•Measurements made with regulated 120 VAC sine wave at line cord.
•All values are rounded down to the nearest 25 watts
BURST AVERAGE
Measured 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 |
8ohms900 | 1250 | 3000 | 800 |
|
|
4ohms1500 | 2250 | 6000 | 1200 |
|
|
BOTH CHANNELS DRIVEN (WATTS).
LOAD |
| CONT. AVG. | BURST AVG. | PEAK INSTANT | FTC |
8ohms750 | 1200 | 3000 | 650 |
|
|
4ohms1200 | 2175 | 6000 | 950 |
|
|
BRIDGED (WATTS)
LOAD |
| CONT. AVG. | BURST AVG. | PEAK INSTANT | FTC |
16ohms1500 | 2400 | 6000 | 1300 |
|
|
8ohms2400 | 4350 | 12000 | 1900 |
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THD DISTORTION
LOAD | AT 1KHz | 20Hz - 20KHz |
8 ohms | <0.003 % | <0.04 % |
4 ohms | <0.004% | <0.05 % |
CROSSTALK: | |
| |
INPUT IMPEDANCE: | 20K ohms balanced, 10 Kohms unbalanced |
INPUT 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: | |
DC OFFSET: | less than 25 millivolts |
PROTECTION: | fully protected, DC, LOAD and THERMAL |
COOLING: | interleaved heatsink with DC servo controlled fan |
SLEW RATE: | Power amp: 30 V/usec, 60 V/usec in bridged mode |
DAMPING FACTOR: | (rise time limited to 18 V/usec by input filter). |
>500, 20Hz - 400Hz, into 8 ohms | |
MAX OUTPUT CURRENT: | 100 amperes for 10 milliseconds, 50 amperes continuous |
TURN ON/OFF: | < 15 milliwatts / seconds, 0.5 Wpk (1s on delay). |
EFFICIENCY: | Better than 75% at full power into 4 ohms |
WEIGHT: | 42 pounds 17.75 Kilograms |
SIZE: | 3.5" x 19" x 15.75" (front panel to binding posts) |
POWER SUPPLY: | Toroidal transformer and combination |
POWER COMSUMPTION: | power switch/circuit breaker |
Will not exceed 13.5 Amps under actual conditions |
10 | 11 |
