Poly-planar MA-9020 Owner's Manual download pdf (Page 20)

T R O U B L E S H O O T I N G

PROBLEM CAUSE CORRECTIVE

ACTION

No power Blown fuse, power

wires disconnected

Check the fuse and

power wire or ground

wire connection

No sound Mute is on, Volume set

at minimum, wiring is

not properly connected

Turn Mute to off, adjust

volume to a desired

level, check the

speaker wire

Cannot read some

USB devices

This unit is not 100%

compatible with all

USB devices or the

USB devices has

special format.

Try to format the USB

device in FAT 16/32

standard

Unit powers off by

itself

The battery may be too

low (the unit operating

voltage is 10.8v to

15.6v).

Unit takes about 45

seconds to

recognize some

USB device or SD

card

This is normal. The

unit sometimes takes

longer time to read all

the files inside the USB

device or SD Card.

Try to remove the USB

device or memory card

and insert it again.

Operations keys do

not work

Press the RESET

button

The unit picks up

engine noise.

Check the ground wire.

The radio does not

work. The radio

station automatic

selection does not

work

The antenna cable is

not connected or the

signals are too weak

Insert the antenna

cable firmly or select a

station manually

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MRD85i OWNER’S MANUAL 1

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