Jensen owner manual Troubleshooting, VR187 Ignition and Interference Noise, Maintenance

Troubleshooting

Problem	Cause	Corrective Action
No power.	Vehicle ignition switch is not on.	If the power supply is connected to the
		vehicle accessory circuits but the
		engine is not turned on, switch the
		ignition key to “ACC”.
	The fuse is blown.	Replace the fuse.
Disc cannot be loaded	There is a disc already inside	Remove the current disc and insert the
or ejected.	the unit.	new one.
	Inserting disc in wrong direction.	Insert disc with label facing up.
	Disc is defective or dirty.	Clean disc or try playing another one.
	Excessive temperature in	Cool vehicle to a normal temperature.
	vehicle.
	Condensation has collected.	Turn player off for an hour, then try
		again.
No sound.	Volume turned down too low.	Adjust volume until sound is heard.
	Wiring not connected properly.	Check wiring connections.
Sound skips or sound	Installation angle exceeds 30	Adjust the installation angle to less
quality is poor.	degrees.	than 30 degrees.
	Disc is defective or dirty.	Clean disc or try playing another one.
	Cassette is defective.	Try playing another cassette.
Operation keys do not	Microcomputer is not operating	Press RESET.
work.	properly due to noise.
Radio does not work	Antenna cable not connected.	Insert antenna cable firmly.
Automatic station	Radio signals are too weak.	Select a station manually.
selection does not
work.
Front panel will not	Front panel not centered	Re-center the left/right manual swivel
motorize back into unit		adjustment
The display is dark	Direct sunlight reflecting off	Close windows and/or sunroof
	screen
	Incorrect color/brightness	Adjust color/brightness settings
	settings
Remote control does	Batteries are weak	Replace batteries
not work
	Direct sunlight interfering with	Close sunroof or try to reduce amount
	infrared sensor	of sunlight in car

VR187

Ignition and Interference Noise

Ignition Noise

The most common source of noise in reception is the ignition system, due to the fact that the radio is placed relatively 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.Generally, the ignition noise can be suppressed considerably by using a radio suppression high-voltage ignition wire and suppressor resistor in the ignition system. Additional noise suppressors may also be used and can be obtained from most CB/amateur radio or electronic supply stores.

Interference Noise

Radio reception in a moving environment is very different from stationary reception. For example, AM reception will deteriorate when passing through a tunnel or under high-voltage lines. Also, noise can be picked up from passing vehicles. Although AM is subject to interference, it has the ability to be received at great distances because the broadcasting signals follow the curvature of the earth and are reflected back by the upper atmosphere.

Maintenance

System Maintenance

The following maintenance tips will extend the life and optimize the performance of the unit.

•Keep the unit dry. If it is exposed to moisture, wipe it dry immediately. Liquids may contain minerals that can corrode the electronic circuits.

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

•Handle the unit carefully; dropping it can damage circuit boards and cases, causing the product to malfunction.

•Clean the unit occasionally by wiping it with a damp cloth. Do not use harsh chemicals, cleaning solvents or strong detergents to clean the product.

•Use and store the unit only in mild temperature environments. High temperatures can shorten the life of electronic products, damage batteries and distort/melt plastic parts.

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