Fender SR-6520PD, SR-8520PD owner manual Upkeep And Service, Troubleshooters Checklist

4.Slowly attenuate the Equalizer control which has the greatest effect on reducing the ringing. This will take some trial and error - the first ringing usually occurs between 1 kHz and 4 kHz. Continue until the ringing has stopped.

5.Again, slowly increase the output level control until the system is on the verge of feeding back. Adjust the equalizer to remove the potential feedback. Continue this procedure until you have achieved sufficient gain for your application or until the equalizer becomes ineffective at removing the ringing. It is best to back off the gain once maximum gain before feedback has been established. Avoid extreme settings or settings which require a large amount of cut in the middle fre- quency bands, as such settings impair intelligibility.

6.“Fine tune” the equalizer settings as the perfor- mance progresses to achieve the best overall sound from the system.

4-3. CORDS AND CABLES.

4-3-1. MICROPHONE CORDS. On the SR mixers, use balanced two-conductor shielded cable for all long runs. Balanced systems are capable of rejecting noise introduced from such sources as cash registers, electric motors and triac-controlled lights. If a balanced cable is connected to an unbalanced output (e.g., a key- board mixer output) or microphone, use a balancing transformer close to the unbalanced device. This ensures maximum common-mode noise rejection for the entire system.

If you have no choice and must use unbalanced cables, use the shortest cables possible and keep them away from AC power mains, lighting cables and speaker wires. If you want the quietest system possi- ble, you should follow these rules with balanced lines as well.

4-3-2. SPEAKER CABLES. Use two conductor zip cord to connect the amplifier outputs to your speakers. The gauge of the wire is important; wire that is too light in gauge consumes power (the power from the amplifier heats up the wire for your particular situation). To cal- culate your speaker impedance, use Figure 3.

4-4. INPUT PADS. If input signal levels are too great, the input stage may be overdriven and cause distor- tion. The solution in such cases is to use an input pad. A 30 dB pad can be made by using a Switchcraft con- nector (part #S3FM) with the resistor network shown in Figure 4.

4-5. PATCHING. Figures 5 through 8 show possible ways of patching external equipment into the SR mixer. They are by no means the only patches possi- ble. If you want to try a patch that is not illustrated, consult the Block Diagram to determine if your patch is possible. When patching external equipment into the signal chain, best results will be obtained by following these rules:

•Use the highest quality patch cords available and keep them as short as possible.

•Avoid patching a buss output back into its input. An example of this is patching a phase shifter from the EFF. OUTPUT / REVERB FOOTSWITCH and returning it to the input of a channel which has its EFF./REV. control turned up. Doing so may result in oscillation (possibly inaudible) that can damage loudspeakers and create dis- tortion.

•Do not use a mic level or instrument level effect (such as an effect intended for guitar) with a line level signal (such as the Main or Graphic EQ output).

5.UPKEEP AND SERVICE

The SR powered mixers have been designed to give years of trouble free service. With a few precautions, you can help to insure its continued reliable service.

•Do not obstruct the air vents on the rear panel.

•Transport the mixer with care.

•Periodically inspect the mixer for damage which may occur during transportation.

•If you leave the mixer set up when you are not using it, protect it from dust with a soft cover.

DO NOT SET FOOD OR BEVERAGE on the SR powered mixer - this can not be overemphasized. Spilling a drink can be the quickest way to ruin a potentiometer (fader, level control, EQ control) or switch.

•When using the mixer protect it from moisture (rain, sprinklers, beer, etc.)

•Periodically clean the mixer by wiping it with a soft cloth and a small amount of fur- niture polish.

6.TROUBLESHOOTER'S CHECKLIST:

If the mixer is set up but does not function, check the following items:

-Is the mixer power cord properly plugged into an electrical outlet?

-Is there power at the outlet?

-Are the speakers properly hooked up to the mixer?

-Are the proper controls turned up? -Is the instrument turned up? -Check all cables and wires.

If, after checking all of the above, the mixer is still not performing correctly, consult your Fender Service Dealer.