PolyPlanar MRD-70 - Manual (Page 11)

Poly Planar LLC 520 McCormick Dr. Glen Burnie MD. 21061 410-761-4000
www.polyplanar.com
11
Troubleshooting:
No Audio, Inside door LED off
1. Make sure the control panel is on.
2. Make sure the Blue remote wired is switched to 12 volts.
3. Make sure the inline fuse is not blown. (Red wire)
4. Check that power wires are getting 12 volts from battery.
No Audio, Inside door LED on
1. Make sure the control panel is not in MUTE mode.
2. Make sure the volume is up.
3. Check that speaker outputs are not shorted to ground.
4. Make sure speakers are connected
Distorted Audio / Audio Cycles on & Off
1. Make sure speaker wires are not shorted together.
2. Power voltage too low or too high.
3. Input signal level too high. Turn down.
4. Power wire gauge too small. Use at least 14AWG wire.
Low Bass Output
Speakers are wired out of phase. Check polarity of wires to the
speakers.
Radio Keeps Blowing Fuse
1. Battery + and
– reversed at power leads.
2. Incorrect or shorted wiring.
3. Too many speakers or shorted speaker voice coil.
Whining Noise
1. Bad ground connection. Confirm that the black wire returns to battery
ground with at least a 14AWG wire.
2. Do not share grounds or power connections with other power
electronic equipment such as motors, pumps, and VHF radios.
3. Be careful to route all radio wires away from other high current
equipment wires.
4. Add a noise filter or ground-loop isolator if all else fails.
Radio Unresponsive
Open the door and press the reset button located under the EJECT
button.