Jensen MSR7007 Care and Maintenance Troubleshooting, Ignition, Interference, Reset button

MSR7007

CARE AND MAINTENANCE TROUBLESHOOTING

•If liquids (coffee, soda, etc.) are spilled on the radio, wipe it dry immediately. Some liquids 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

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 professional mobile electronics retailers.

Interference

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 received at great distance. This is because broadcasting signals follow the curvature of the earth and are reflected back by the upper atmosphere.

Symptom	Cause	Solution
No power	The vessel’s +12V switched	If the radio power supply is prop-
	power source is not on	erly connected to the vessel’s
		+12V switched power source ter-
		minal, switch to “on” position
	The fuse is blown	Replace the fuse
Disc cannot be loaded or	Presence of CD disc inside	Remove the disc in the player and
ejected	the player	insert the new one
		If disc will not eject, press the
		RESET button
	Inserting the disc in reverse	Insert the compact disc with the
	direction	label facing upward
	Compact disc is extremely	Clean the disc or try to play a new
	dirty or disc is defective	one
	Condensation	Leave the player off for an hour or
		so, then try again
No sound	Volume is too low or system	Adjust volume to audible level
	is muted
	Wiring is not properly con-	Check wiring connections
	nected
The operation keys do	Front panel not properly	Close front panel
not work	closed
	The built-in microcomputer	Press the RESET button
	is not operating properly
	due to noise
Sound skips	The installation angle is	Adjust the installation angle to
	more than 30 degrees	less than 30 degrees
	The disc is dirty or defec-	Clean the disc and try to play
	tive.	again or use new disc
Cannot tune to radio sta-	The antenna cable is not	Check antenna cable
tion, auto-seek does not	connected
work
	The signals are too weak	Select a station manually

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