Blaupunkt V7000 manual TROUBLE-SHOOTING Guide, Gymptom Probable Cause & Solutions

TROUBLE-SHOOTING GUIDE

GYMPTOM PROBABLE CAUSE & SOLUTIONS

. No power (blue remote turn-on • light is off)

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.

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Check connections to the amplifier’s + 12 volt, Ground, and remote lines Verify the appropriate voltages are at their terminals (1 l-1 5 VDC). Check the main power connection at the battery.

Check fuse in power line. If fuse is blown, replace it. If it continues to blow, see your Blaupunkt dealer.

Disconnect all speakers and try to power up unit. If it now turns on, a speaker short is probable.

!. Power but no sound (blue	.	Check all RCA input cables and speaker output cables.
remote turn-on light is on)	•	Test the speaker with a VOM to verify > 1 ohm loads per channel.
I. No sound from one channel	0	Check radio balance and fader control positions.
or entire side	.	Check loudspeaker connections.
	.	Check cd changer connections (if applicable).
1. Very low sound level	.	Check radio balance and fader control positions.
	.	Check amplifier’s input gain control setting - adjust for higher output
	.	levels if possible.
		Head unit may have extremely low output voltage. A step-up voltage
1. Power amplifier turns on and off	0	Make sure connections at battery are tight.
repeatedly (Motor boating)	.	Check battery voltage at amp using VOM; it should be 1 l-1 5 VDC.
	.	Check all radio and amplifier ground connections.
i. Amp sounds fine but gets	.	Input gain control is set too high; lower input level accordingly.
very warm to the touch	0	Verify that speaker load impedances are > 1 ohms per channel.
	.	Verify that the mounting location allows for free air movement around the
		amp. The largest area should be above the unit since heat rises.

‘. Amplifier turns off during	•
loud passages or is distorted	•
	.

Input stage being severely overdriven. Lower input gain.

Verify that speaker load impedances are > 1 ohms per channel.

Verify that one of the speaker outputs is not shorted to the chassis of the car.

I. Amplifier turn-on/off pops or • noises

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Disconnect the RCA input lines to the amp and turn amplifier unit on and off via the Trigger line. If pop goes away, the amp is turning on faster than the time required for the radio outputs to settle down. A turn on delay line may be needed.

If the noise persists, disconnect the Trigger line from the head unit and try connecting directly to the battery. If the noise goes away, use a relay to switch the trigger line from the clean power source.

I.Crackling noise on AM and FM • radio, but not on tape or cd.

Varies with accelerator but is

present at all times.	.
(This is “radiated” noise)	.
	.

Make certain the problem is “radiated” noise by placing a portable FM radio near the car engine. If noise is picked up, then it is an automotive problem and not your system.

Make sure the spark plugs and wires are <2 years old; otherwise replace.

Verify that the engine block is grounded to the car chassis, not paint. Verify the hood is ground to chassis. If not, purchase a flexible metal strap, scrape off paint at the connections, and screw into place.

IO. Whining noise (alternator whine) •			Check power connections to be sure they are clean.
occurs while engine is running		•	Reroute power to the radio so that it runs directly from battery bypassing
and varies in pitch with engine			battery terminal in fuse box.
speed (this noise VARIES with . .		0	Check ground connections to be sure surfaces have been scraped clean
radio’s volume	setting}.		for good connections.
I 1. Whining noise	(alternator whine)	•	Check battery ground connection at chassis to make sure it’s clean and
occurs while engine is running			tight. Verify that all connections are scraped clean of paint, rust, or
and varies in pitch with engine			grease.
speed {this noise DOES NOT		.	Check radio and amp connections; you may have to relocate amplifier
vary with radio’s volume
			ground to same point as radio ground.
setting}.
		.	Bypass all equipment between radio and amp (e.g., equalizers, etc.) and
			connect directly to amp. If problem goes away, reinsert each componerr
			until noise reappears. Logic shows this part is the problem.
		0	Check for “high level ground loops”; turn off and disconnect unit
			grounds, one at a time, except for the power amp. Turn system back on

and check for noise after each ground is removed.

0Check for RCA shield “signal level ground loops” by disconnecting th shield of the RCA cable at one end. If noise disappears modify cable accordingly.

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