Jensen JWM70A, Installation And Owner'S Manual

CARE AND MAINTENANCE

TROUBLESHOOTING

–

Keep the product dry. If it does get wet, wipe it dry immediately. Liquids 
might contain minerals that can corrode the electronic circuits. 

–

Keep the product away from dust and dirt, which can cause premature wear 
of parts. 

–

Handle the product gently and carefully. Dropping it can damage circuit 
boards and cases, and can cause the product to work improperly. 

–

Wipe the product with a dampened cloth occasionally to keep it looking new. 
Do not use harsh chemicals, cleaning solvents, or strong detergents to clean 
the product. 

–

Use and store the product only in normal temperature environments. High 
temperature can shorten the life of electronic devices, damage batteries, 
and distort or melt plastic parts. 

Ignition 

Interference 

The most common source of noise in reception is the ignition system. This is a 
result of the radio being placed close to the ignition system (engine). This type of 
noise can be easily detected because it will vary in intensity of pitch with the 
speed of the engine. 
Usually, the ignition noise can be suppressed considerably by using a radio 
suppression type high voltage ignition wire and suppressor resistor in the 
ignition system. (Most vessels employ this wire and resistor but it may be 
necessary to check them for correct operation.) Another method of suppression 
is the use of additional noise suppressors. These can be obtained from most 
CB/A radio or electronic supply shops. 

Radio reception in a moving environment is very different from reception in a 
stationary environment (home). It is very important to understand the difference. 
AM reception will deteriorate when passing under a bridge or when passing 
under high voltage lines. Although AM is subject to environmental noise, it has 
the ability to receive at great distance. This is because broadcasting signals 
follow the curvature of the earth and are reflected back by the upper atmosphere. 

Symptom

Solution

Radio will not turn 
ON or No front 
panel operation 

Radio turns ON, 
but no sound 

CD/DVD does not 
load fully

CD/DVD does not 
play correctly

No AM or FM 
reception

DVD plays sound 
but no video 

Unit does not 
respond to 
Remote Control

Try the reset button. 

Check fuse.

Check 12V+ on accessory wire to radio (RED wire)

Check Ground. 

Verify Volume, Fader/Balance, Mute controls are set 
correctly (see owner's manual). 

Try the reset button. 

Verify proper speaker selection. 

Verify proper speaker connections. 

Check for shorts or open circuits on speaker wires.

Ÿ

If short on “A” channel, “B & C” channels will continue to 
function. 

Ÿ

If short on “B and/or C” channels, “A” channel will continue 
to function. 

Make sure transport screw has been removed from rear of 
unit. Disc will load for several seconds and then eject if 
transport screw has not been removed.

Make sure unit has power and no other CD/DVD is currently 
inside.

Check to make sure disc is inserted correctly. 

Verify disc is free from dirt, scratches, etc. 
Check with factory Cds. 
Inspect radio's chassis to verify shipping screw(s) have been 
removed. 
Check factory original CDs for compatibility warnings (due to 
various copy-protection, multimedia content, etc.). 

Verify you are tuned to a valid station. 
Check your antenna connection on rear of stereo.
Try a different antenna 

Make sure the HDMI cable is routed from the HDMI output to 
the input on the television. 

Verify that you have a clear line of sight for the IR signal. 

Check the batteries. 

Confirm the remote IR sensor in plugged into IR input (if 
applicable). 

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