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January 2015
Posts: 8
| Hi folks,
I'm new on the forum. I've made some researches but I've not found any thread corresponding to my problem...
I have a 1995 Elite longneck DS-768 with an optima preamp.
The tuner doesn't function anymore. Even with a new battery, the green light doesn't clip and the leds stay irremediably dark...
I think that these parts are obsolete and impossible to find.
So I'll try to repair or have it repaired.
I've found the service manual with schematics but it seems that the page 3 of 4 is missing. And it's an important one, with Eq, FET... I think...
Does anyone have the complete schematics ? Does anyone has had this kind of problem ?
Any help would be greatly appreciated.
Thanks
Pierre from France  |
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October 2005
Posts: 4066
Location: Utah | Try contacting John Budny at the repair shop. He may have access to a replacement preamp. |
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Posts: 4066
Location: Utah | Also try posting in the For Sale forum that you are looking to buy an Optima. Someone may have a used one in working condition. |
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January 2015
Posts: 8
| Hey FlySig, thanks for the advice!
How can I join John Budny from France? Have you an email contact?
Or is he a forum member?
Thanks for helping a newbie
Pierre from France |
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December 2004
Posts: 573
Location: Denmark | Hello Pierre.
Welcome here. A diagram of the Optima can be seen here: http://www.ovationtribute.com/Ovation%20Schematics/Ovation_Optima_P... This seems not completely complete, but it does include the parts relevant for troubleshooting the tuner circuit I believe. It could be a bad connection/solder joint somewhere in the signal chain from FET to tuner circuit or the power to the tuner circuit. As I read the diagram called "Slider board" the circuitry in the upper left corner forms an analog timer for the voltage supply to the tuner board.
Edited by tpa 2015-02-26 2:30 PM
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Location: near Cologne/Germany | Pierre, you find the manual here: http://www.ovationtribute.com/Catalogues/Optima_Owner_Manual/Optima_Owner_Manual.html Georg Tomorrow is my day - or not, you know..... |
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January 2015
Posts: 8
| Hi Tpa
Thanks for these advices.
As the green light doesn't blink anymore when the tuner is activated, I rather think that there is a problem with the tuner supply. So I have ordered a 2N5088 transistor and I'm going to change Q201, and maybe C201 capacitor. I hope that will fix the problem. What do you think?
Pierre |
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January 2015
Posts: 8
| Hi Georg
Thanks for the link.
I cross my fingers for you!
Let me know when you receive your new babe.
Pierre |
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October 2005
Posts: 4066
Location: Utah | I would try to jumper across SW203 to see if it turns on the tuner. If the switch doesn't make contact it won't power up. Corrosion on the switch contacts is more likely than Q201 failing. |
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December 2006
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Location: Jet City | 
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October 2005
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Location: Utah | John Budny is the service department at the old factory. john.budny@kmcmusic.com is his email. |
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Location: near Cologne/Germany | Pierre,
if it's only the tuner, Damon's suggestion isn't that bad, any odd tuner will do, some an even better job than the built-in. Remember, there was - and for many guitars still is - a time, when there was no on-board tuner. But it seems as if you have some knowledge about electronics, then you may try and if it doesn't work, vou either clip a tuner or use a cable. And - beside that - Ovations are very constant in staying in tune...
P.S. - Picked the box today, well packed. Opened it at the store, because it has been there for three days, so it was acclimated. Just a brief look, did not take it out. The top was undamaged. Hope it goes on like this. She went from New York to Humble in Texas, then to Miami and crossed the Atlantic, arrived Rotterdam by ship in a container and made the final miles in a Pick-up to the Cologne area.
I hope the second and longer glance will be satisfying as well. I'll let you know.
Got a suitable price, they charged less than $100 for the transport. Of course there was custom fees, but its amount was as expected.
275€ in total, the guitar was $1000. |
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January 2015
Posts: 8
| Hello,
After spending the whole afternoon testing my preamp and re-soldering some parts without setting the problem, I finally found that the failure was coming from the little tuner board itself, probably the micro chip.
And as the inscriptions on it are half deleted, I can't determine what type of IC it is to try to find another one.
So I put out a new call on the forum. If somebody know what part this little chip is or if somebody has a dead optima preamp with a functioning tuner board, please PM me, I would be happy to buy!
Otherwise I would take Damon's suggestion.
For Flysig, John Budny answered me. Unfortunately they have no more parts for the Optima, nor repair sheets.
Thanks for helping!
Regards
Pierre from France
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Location: Denmark | According to http://www.ovationtribute.com/Ovation%20Schematics/Ovation_BOM_Opti... the circuit was made by Micanopy Microsystems which according to my google searches is closed. |
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Optima preamp schematics
