28 replies to this topic

[Jackman]

Right, i think i know why but want to know if im right and what i can do.

When my radio is turned up, after a set point it just turns off and resets (protection i guess) it comes back on no problem.

Im guessing its due to it running out of juice from the battery, i already have a 70 amp alternator and when the cars running i can go a bit louder than when the engine is off.

Will fitting a larger battery fix this problem?

All the earths and lives are good, already checked them.

Running the standard size mini battery.

Ta

Jackman.

[mars red mike]

Could be that where ever the lives for the radio are connected to (ie fusebox) are a tad overloaded and cant pull enough juice when it needs it. Either that or the wires for the lives and earth on the radio are too thin and again cant pull the power through quick enough so shuts down. Or maybe you are just turning it up too loud

[Jackman]

Radio has a seperate feed for power (well shared with alarm)... wires too thin... now i never thought of that.

Too loud, does it on setting 17 out of 40 (think its 40) If the car isnt running its 15.

My drops are still alot louder than the radio

[dprisoner]

I had a problem with my radio, where it would loose volume as I accelerated. It turned out to be the ignition coil was going/gone bad.

[Bungle]

i would say it's because the amp in the head unit is getting to hot

this is because of 1 of 2 things or a mixture of both

1 it's just getting hot and there is not cool enough free air around the head unit to get rid of this heat

2 it's getting too hot because it's doing too much work, if the cables feeding the head unit are under sized (or a bad connection) the voltage will drop, if the voltage drops the current will go up to compensate resulting in more heat

[petwar]

ive had this before, its when there is not enough power going to the unit. Just run thicker cable from your battery to give a permanent live but make sure it is fused correctly.

[Jackman]

i would say it's because the amp in the head unit is getting to hot

this is because of 1 of 2 things or a mixture of both

1 it's just getting hot and there is not cool enough free air around the head unit to get rid of this heat

2 it's getting too hot because it's doing too much work, if the cables feeding the head unit are under sized (or a bad connection) the voltage will drop, if the voltage drops the current will go up to compensate resulting in more heat

Well i know its not getting hot as it can do it as soon as i start driving, turn it up too high and off it goes.

ive had this before, its when there is not enough power going to the unit. Just run thicker cable from your battery to give a permanent live but make sure it is fused correctly.

Shall try a thicker cable, thank you.

[mini_mad69]

I would say dicky earth maybe?

Although it could be that there isn't enough power.


No speaker wires shorting out?

[Frequency]

hey man

you might also have a short on one of your speaker wires, where they are just touching a bit of steel on the body or maybe a bit of the insulation has come off.
this can cause the head unit to go into protection mode where it switches off so as to prevent damage to the internal amplifier

try disconnecting the speakers one at a time and then turn it up to see if it cuts out, if you disconnect one and then it doesn't switch off then there is a short somewhere on that wire

hope that helps

edit: oops, yea what he said ^^^^ i'm so going blind

Edited by Frequency, 21 September 2009 - 10:31 PM.

[AuDix]

ive had this prob.

the voltage drops below a level the head unit can take

get a cap to keep the voltage high.

This sorted my headunit in my Mk5 golf


Will

[Jackman]

No speaker wires shorting out?

OOO theres a thought... wonder if my rear speakers (they sit on the rear shelf just above the metal normally) have fallen off and shorted out... well they dont do it constantly but wonder if the sub is knocking them to earth?

the voltage drops below a level the head unit can take

Voltage drop sounds possible... with the lights on the volume level possible on is lower. Wondering if the standard mini battery runs out of puff. Volt gauge reads 12-13.

Edited by Jackman, 22 September 2009 - 07:14 AM.

[pbrain]

hey man

you might also have a short on one of your speaker wires, where they are just touching a bit of steel on the body or maybe a bit of the insulation has come off.
this can cause the head unit to go into protection mode where it switches off so as to prevent damage to the internal amplifier

try disconnecting the speakers one at a time and then turn it up to see if it cuts out, if you disconnect one and then it doesn't switch off then there is a short somewhere on that wire

hope that helps

edit: oops, yea what he said ^^^^ i'm so going blind

This sounds more realistic, take the speaker wires from the back of the HU and measure each speaker cable, it should be around 4ohms if you have 1 speaker per channel (+-1 ohm) if you've got close to 0 ohms this is obviously a short and will cause the said problems. any other reading, trace the cables for damage and finally inspect the speakers themselves (check connections, flexi-leads and speaker cone moves without rubbing)

[Bungle]

Voltage drop sounds possible... with the lights on the volume level possible on is lower. Wondering if the standard mini battery runs out of puff. Volt gauge reads 12-13.

is that measured at the head unit ?

[Jackman]

Yes.

That ohm things clever but id expect it to cut out randomly not before a big bass note?

[daemonchild]

Perhaps the radio doesn't like your music...?
Or is it trying to save your ears?

I does sound like some kind of protection mode. Are there no clues in the manual such as "If you try and run me with shorted speaker wire, I'll turn off to protect myself?".