TM-6800 is dead

[brianog]

Hi,
Have owned a TM-6800 hd for some time. I have not used it for a few months.
When I switched it on today the front panel of the box was blank. I can get the blue circle on the right to come on and the word "Technomate" to show on the screen by either switching it off and on or detaching the disk and reattaching it but I cannot get further than that. I worked briefly this afternoon, but it is now dead again.
Can you suggest anything I can do?
Regards
Brian

[markwi]

Take the cover off(with the power disconnected) and check for bulging capacitors in the power supply board,a common problem with these receivers.Sometimes the capacitors split.I believe they are 1500 uF ,10V.They need to be changed to 1500uF with a higher voltage rating,so long as they can fit in the space left by the original.Cheers

[brianog]

Take the cover off(with the power disconnected) and check for bulging capacitors in the power supply board,a common problem with these receivers.Sometimes the capacitors split.I believe they are 1500 uF ,10V.They need to be changed to 1500uF with a higher voltage rating,so long as they can fit in the space left by the original.Cheers

Thanks markwi for replying so quickly. I will follow what you suggest and get back to you.
Brian

[brianog]

Technomate TM-6800 HD Power Supply 3.jpg

Have removed the cover. The only 2 capacitors which seems to have "weeped" or split are

1. a 2200 miF one - the largish one at the bottom of the circuit board in the picture below the left hand heatsink(?) in the picture. At the bottom of this component it seems to have weeped a light brown which covers a part of the board beneath it. Should I replace this with a higher voltage one?

2. a 68miF one (with a green top) on the other side of the board.

Should I replace both?
Also, where are the 1500 capacitors on the board?

Sorry for the small picture. I don't seem to be able to upload larger ones onto your site.

Brian

[daveking253]

Hi
I had the same problem today.

On the power supply board there
are 3 [1000uf 10v capacitors].

mine were not leaking or swollen.
I replaced them with [1000uf 16v] from maplins
at ?2.36 for 4 caps! was told threre are 4 to change but I
could only find 3.

Working great now.

thank you.

dave king

[paulocallaghan]

Could someone please post a photo of the front of this dash , tere are so many Newholland models tey tend to confuse me

[markwi]

Power supply.jpg Here is a picture from another thread showing where(I believe) the 1500uF caps are(arrowed).Looks slightly different to yours,in that area.I'd change any caps that are split or bulging for the values of the originals but with a higher voltage rating.They do have a positive and a negative so be careful how you put the new ones in(make a note on the pcb how the original ones are postioned) and you may need a solder sucker.Cheers

[markwi]

@paulocallaghan Think you may be on the wrong thread

[brianog]

Thanks very much, Dave.
I suppose I also should replace the ones which have "weeped"?
Brian

[brianog]

Thanks markwi. Will follow your advice and let you know the outcome.
Brian

[brianog]

Hi Mark and Dave,
Unfortunately the two pictures (mine and Mark's) show different power supplies. Maybe they changed the design at some stage. Problem is firstly reading the values of the capacitors as they are so close together. There are two that have weeped on my board (a 2200 uF at the bottom of the board below the left hand heatsink and a 68miF one (with a green top) on the other side of the board.) as I mentioned before. Should I just replace them? When I remove them I may see the 1000uF and the 1500uF. Wondering if anyone else has the same ps as mine and could send a photo?
Regards

[markwi]

I'd change the weeping ones and maybe the ones arrowed in my posted picture if there's any sign of bulging on the sides or tops,but as Dave says there was no bulging on his caps.You could always speak to technomate.Don't forget to make a note of how they are positioned before you remove any caps.Cheers

[brianog]

Hi Folks,

Re cost of new power supply for the 6800. Thought it might be helpful for people in the UK. They have just emailed:

Afternoon,

Price is ?35, postage ?8.

If you would like any further assistance, please don't hesitate to contact us by e-mail or on: 020 8884 0701.

Best Regards,

----------------------
Technomate Ltd
Unit 11 Nobel Road
Edmonton
London N18 3BH
Tel: 020 8884 0701
[email protected]
www.technomate.com

Must confess I am wondering if it might be best to buy one as, if I try to do it myself I might miss some faulty capacitors. Also assuming I can go and see them and make the purchase they might check the unit to see if the motherboard is ok.

Brian

[markwi]

That's quite a good price.Think I'd try the caps first,but then I'm tight!Good luck.

[brianog]

Thanks, folks, for all your help.
Went to Technomate's store yesterday (in Edmonton, UK) and they were very helpful. Checked the motherboard for me (OK) and I decided to buy a new power supply which they fitted and the unit is working fine.

I'm not as young as I was so I thought trying to replace all the capacitors on the board was a bit much for me.The chap at TMs confirmed what you said that you cannot necessarily tell which caps are faulty from their appearance so it is best to replace all of them.
All the best
Brian