MB QUART RAA4200 manual Gain, Amplifier Does Not Turn On, No Sound Coming From Amplifier

OPERATION

GAIN

Do the following individually for each channel.

Turning the adjuster clockwise decreases the set gain.

Turning the adjuster counter-clockwise increases the set gain.

1.To adjust the gain setting, turn the amplifier gains all the way down (clockwise).

2.Turn the source unit volume up until distortion is audible and then turn it down a bit until the distortion is inaudible. This will be about all the way up on most source units.

3.Increase the amplifier gain setting until adequate volume is achieved or clipping is noted by the LED indicators. Turn the gain down slightly if clipping is indicated.

Most quality source units do not distort, so the volume can be used at maximum setting.

NOTE: Best signal to noise and dynamic range are realized with the gain at minimum. Most users find adequate gain and volume is achieved at about halfway in the adjustment range.

CAUTION: Avoid setting the amplifier gain very high as noise and distortion will increase significantly.

NOTE: For a more in depth setting procedure, contact MB Quart Technical Support.

TROUBLESHOOTING

Amplifier Does Not Turn On

Possible Cause

The in-line fuse on battery positive cable is blown.

Poor ground connection

Poor power connection or power outside acceptable range.

Solution

Check in-line fuse on battery positive cable. Replace if necessary.

Verify that Ground connection is connected to clean metal on the vehicle’s chassis. Repair/replace if necessary.

Verify there is 10.5 - 15.5 Volts present at the positive battery and remote turn-on cable. Verify quality connections for both cables at amplifier, stereo, and battery/fuseholder. Repair/replace if necessary.

No Sound Coming From Amplifier

Possible Cause

Poor RCA connections.

Poor speaker connections

Bad source unit

Solution

Verify good RCA input connections at source and amplifier. Check entire length of cables for kinks, splices, etc. Test RCA inputs for AC voltage with the source unit on. Repair/replace if necessary

Use an ohm meter to check speaker wire integrity. Check entire length of wires for kinks, splices, etc. Repair/replace if necessary.

Connect RCA input from test source directly to amplifier input. If this solves the problem, have the source unit repaired or replaced. If not, have the amplifier checked by a qualified technician.

Speaker "Pop" When Amplifier Turns On

Possible Cause

Remote from source unit comes on too quickly.

Poor remote power signal from source

Solution

Disconnect input signal to amplifier and turn amplifier on and off. If the noise is eliminated, connect the REM lead of amplifier to source unit with a delay turn-on module

Use a different 12 Volt source for REM lead of amplifier (i.e. battery direct). If the noise is eliminated, use a relay to isolate the amplifier from noisy turn-on output.

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