Electro voice 7300 a owners service manual

Page 1

BechoVoice
EV® 7300A

STEREO POWER AMPLIFIER

OWNER'S OPERATION AND SERVICE MANUAL

Page 2

Operating and Service Instructions for the Electra-Voice 7300A Power Amplifier

Table of Contents

1 ELECTRICAL ................................... é ....................... 1

1.1 120 V ac, 50/30 Hz Power Connections .................................... 1

1.2 220/240 V ac. 50/60 Hz Power Connections ................................. 1

2 INSTALLATION .......................................................... 1

2.1 Rack Mounting ...................................................... 1

2.2 Ventilation ......................................................... 1

3 SIGNAL CONNECTIONS .................................................. 2

3.1 Input Connections .................................................... 2

3.2 Line Output Connections ............................................... 2

8.3. Ouwut Connections .................................................. 2

3.4 Output Cable Selection ................................................ 2

8.4.1 Calculating Power Losses with 8 ohm Loads ........................... 2

3.4.2 Calculating Power Losses with 4 ohm [pads ........................... 3

3.5 Damping Factor ..................................................... 3

3.5.1 Calculating the Maximum Length of Cable for a Specified Damping Factor . . . . 4

3.6 Speaker Protection Fuse Selection ........................................ 4

3.7 Compression Driver Protection Capacitors .................................. 5

4 OCTAL ACCESSORY SOCKETS ............................................ 5
5 PROTECTION SYSTEMS .................................................. 6 .

5.1 load Protection Circuitry .............................................. 6

5.2 Amplifier Protection Circuitry ........................................... 6

6.3 Protect Indicator ..................................................... 6

6 OPERATION ............................................................ 6

6.1 Dual Mode of Operation ............................................... 6

6.2 Bridge Mode of Operation .............................................. 6

7 IN CASE OF PROBLEMS .................................................. 6

8 SPECIFICATIONS ........................................................ 7

9 SERVICE INFORMATION ................................................. 18

9.1 Trimpot Adjustments ................................................. 13

9.2 Equipment Needed ................................................... 13

9.3 Adjusting R39. the LF Cancel Irimpot ..................................... 13

9.4 Adjusting R26. the BIAS Trimpot ........................................ 13

9.5 Adjusting R23 and R24, the Negative and Positive Current Limit 'Irimpots ......... 14

9.6 Checking the Short Circuit Current ....................................... 15

9.7 Ordering Replacement Parts ............................................ 15

9.8 Factory Service ...................................................... 15

9.9 Technical Assistance .................................................. 15

i Elecbv-Voicc O a Mark IV Company