Help required please! - Page 2

Angry Koala · 11th June 2007, 02:48 PM

Quote:

Originally Posted by Martin F

If it is still connected then maybe it's that, which is faulty rather than the head unit. If so you should be able to try or buy one from somebody else. Alternatively take it out of the loop for a while.

Process of elimination, etc.

Do I need to remove the seat to get to it?

Martin F · 11th June 2007, 03:00 PM

Ideally yes, otherwise you will be struggling to remove it. Taking the seat out is easy 5 bolts only.

Angry Koala · 12th July 2007, 06:32 PM

Ok, so now the seat's been out 3 times and the dash has been off 5 times in order to try to sort it and I'm still no closer to solving the problem. I've checked all the connections and tried taking individual speakers out of the loop in case 1 bad earth is causing the problem. I've had the amp out of the loop completely. If the unit is left on for 5 miutes or more the hiss disappears but the sound quality is really quiet and crap.

Any ideas before I have to go with the assumption it's the unit itself and go about finding the money for a new one? I don't really want to do this and find there's still the same problem......

Martin F · 12th July 2007, 06:33 PM

Sounds like you've narrowed it down to the head unit

May just try one last thing, a seperate earth wire from the head unit to a good clean earth somewhere. Just rig it up to test to see if it has any effect.

Angry Koala · 12th July 2007, 06:48 PM

unit actually already has an earth running straight to the bodywork underneath it. so I guess that's the head unit then! lol

Martin F · 12th July 2007, 07:23 PM

Yep, anyway you can borrow one from somebody to double check before splashing the cash.

Cass · 12th July 2007, 09:17 PM

Some car frames are pos earthed and some neg earthed sounds like yours is pos.

This is a commen drama with stereos and amps.You need a sound supressor which conects to the rca cables from the amp.

This part only costs around £15 and gets rid of that nasty hiss.

I actualy have one in the shed in a box somewhere i can dig it out and post it to you or bring it to the Aug meet if you like

Cass.

Martin F · 12th July 2007, 10:36 PM

Quote:

Originally Posted by Cass

Some car frames are pos earthed and some neg earthed sounds like yours is pos.

Errrrr i'm not aware of any cars after about 1969 that have a positive earth chassis

Cass · 12th July 2007, 10:41 PM

My old Fiat tipo and my Hyundia coupe were.

Martin F · 12th July 2007, 10:48 PM

Are you 100% sure? Positive earthed cars had one major plus in that they hardly rusted at all, and every Fiat I ever see always has a fair amount of rust on it. (or plastic nowadays).

The Supra defenitely is negative earthed, if you want to double check just try (enter disclaimer here) connecting a wire from the positive terminal of the battery to your engine block

11th June 2007, 03:00 PM	#12
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	Ideally yes, otherwise you will be struggling to remove it. Taking the seat out is easy 5 bolts only. __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

12th July 2007, 06:33 PM	#14
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	Sounds like you've narrowed it down to the head unit May just try one last thing, a seperate earth wire from the head unit to a good clean earth somewhere. Just rig it up to test to see if it has any effect. __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

12th July 2007, 07:23 PM	#16
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	Yep, anyway you can borrow one from somebody to double check before splashing the cash. __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

12th July 2007, 09:17 PM	#17
Cass Beer and more Beer Single Turbo - Auto Join Date: Aug 2006 Location: Inverness / Scotland Posts: 3,610	Some car frames are pos earthed and some neg earthed sounds like yours is pos. This is a commen drama with stereos and amps.You need a sound supressor which conects to the rca cables from the amp. This part only costs around £15 and gets rid of that nasty hiss. I actualy have one in the shed in a box somewhere i can dig it out and post it to you or bring it to the Aug meet if you like Cass. __________________ "Freezing worms makes them easier to sharpen!" Last edited by Cass; 12th July 2007 at 09:22 PM.

12th July 2007, 10:41 PM	#19
Cass Beer and more Beer Single Turbo - Auto Join Date: Aug 2006 Location: Inverness / Scotland Posts: 3,610	My old Fiat tipo and my Hyundia coupe were. __________________ "Freezing worms makes them easier to sharpen!"

12th July 2007, 06:32 PM	#13
Angry Koala Senior Member None - Don't currently own a MKIV Supra. Join Date: Apr 2007 Location: uk Posts: 521	Ok, so now the seat's been out 3 times and the dash has been off 5 times in order to try to sort it and I'm still no closer to solving the problem. I've checked all the connections and tried taking individual speakers out of the loop in case 1 bad earth is causing the problem. I've had the amp out of the loop completely. If the unit is left on for 5 miutes or more the hiss disappears but the sound quality is really quiet and crap. Any ideas before I have to go with the assumption it's the unit itself and go about finding the money for a new one? I don't really want to do this and find there's still the same problem......

12th July 2007, 06:48 PM	#15
Angry Koala Senior Member None - Don't currently own a MKIV Supra. Join Date: Apr 2007 Location: uk Posts: 521	unit actually already has an earth running straight to the bodywork underneath it. so I guess that's the head unit then! lol

12th July 2007, 10:48 PM	#20
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	Are you 100% sure? Positive earthed cars had one major plus in that they hardly rusted at all, and every Fiat I ever see always has a fair amount of rust on it. (or plastic nowadays). The Supra defenitely is negative earthed, if you want to double check just try (enter disclaimer here) connecting a wire from the positive terminal of the battery to your engine block __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

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