Blaupunkt Velocity V7000 Specifications download pdf (Page 18)

TROUBLE-SHOOTING GUIDE

GYMPTOM

PROBABLE CAUSE & SOLUTIONS

. No power

(blue

remote turn-on l

Check connections to the amplifier’s + 12 volt, Ground, and remote lines

light is off)

Verify the appropriate voltages are at their terminals

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.

No sound from one channel

Check radio balance and fader control positions.

or entire side

Check loudspeaker connections.

Check cd changer connections (if applicable).

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

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.

Amp sounds fine but gets

Input gain control is set too high; lower input level accordingly.

very warm to the touch

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

Input stage being severely overdriven. Lower input gain.

loud passages or is distorted l

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.

Amplifier turn-on/off pops or l

noises

Crackling noise on AM and FM l

radio, but not on tape or cd.

Varies with accelerator but is

present at all times.

(This is “radiated” noise)

IO. Whining noise (alternator whine) l

occurs while engine is running l

and varies in pitch with engine

speed (this noise VARIES with . . 0

radio’s volume setting}.

1. Whining noise (alternator whine) l

occurs while engine is running

and varies in pitch with engine

speed {this noise DOES NOT .

vary with radio’s volume

setting}.

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.

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

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.

Check power connections to be sure they are clean.

Reroute power to the radio so that it runs directly from battery bypassing

battery terminal in fuse box.

Check ground connections to be sure surfaces have been scraped clean

for good connections.

Check battery ground connection at chassis to make sure it’s clean and

tight. Verify that all connections are scraped clean of paint, rust, or

grease.

Check radio and amp connections; you may have to relocate amplifier

ground to same point as radio ground.

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.

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.

Check 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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Blaupunkt Velocity V7000 Specifications Page 18

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