Trident mk 1 schems..?

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sam
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Trident mk 1 schems..?

Post by sam » Thu Mar 10, 2011 11:56 am

The synth board is not working....I just need the schems for that board really..
Lam memorymoog.Sonic six.Vp330 mk1.SH101.OSCar.ARP odyssey..multivox mx3000.Solina stringsynth.polivox
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snod_donkey
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Re: Trident mk 1 schems..?

Post by snod_donkey » Fri Mar 11, 2011 10:14 am

Not sure but i think the circuits are much the same as the mk2 version ?? Depends exactly what part you require but this may help if youve not already got it

http://manuals.fdiskc.com/flat/Korg%20T ... Manual.pdf

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Re: Trident mk 1 schems..?

Post by sam » Fri Mar 11, 2011 6:15 pm

Thank you for posing the link...The KLM292 has problems, esp the programmer and piano presets are not working.

There is a piggy back board on the brass board....I need info on that..?
Lam memorymoog.Sonic six.Vp330 mk1.SH101.OSCar.ARP odyssey..multivox mx3000.Solina stringsynth.polivox
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Re: Trident mk 1 schems..?

Post by sam » Sun Mar 13, 2011 11:27 am

The initial problem was the filter envelope was not working as it should.

In my experience the 4051's take care of the pot controls so i have replaced all 4 with new ones....I have put them on holders.

The other fault is saving patches..The red button has no effect.

I have changed a 4007 chip that is connected with it....Also a 4028. (both on holders)

Changing these suspects has made everything worse...No piano now.

The MK2 schems show it to be totally different in design.

Without the schems i am poking around which i don't like but i want to find whats going on here.

I was once told that putting some logic chips on holders can cause problems...I doesn't make sense but it's got me thinking.....?
Lam memorymoog.Sonic six.Vp330 mk1.SH101.OSCar.ARP odyssey..multivox mx3000.Solina stringsynth.polivox
ms20/50.Andromeda. OBX.
Prophet 5 Pro-one. Wasp.EMS AKS.

sam
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Re: Trident mk 1 schems..?

Post by sam » Sun Mar 13, 2011 2:41 pm

It also has this sticky goo on the board...I wonder if this can cause strange things..?
Lam memorymoog.Sonic six.Vp330 mk1.SH101.OSCar.ARP odyssey..multivox mx3000.Solina stringsynth.polivox
ms20/50.Andromeda. OBX.
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Re: Trident mk 1 schems..?

Post by Yekuku » Sun Mar 13, 2011 10:32 pm

I have uploaded it here.
Keep us informed about the progress of the repair.
Good luck Sam ;)
It is all about sharing...

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Re: Trident mk 1 schems..?

Post by sam » Mon Mar 14, 2011 7:32 am

Thank you...I am very grateful for this, I now have a realistic chance on fixing my trident... :D
Lam memorymoog.Sonic six.Vp330 mk1.SH101.OSCar.ARP odyssey..multivox mx3000.Solina stringsynth.polivox
ms20/50.Andromeda. OBX.
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Re: Trident mk 1 repair update

Post by sam » Wed Mar 23, 2011 9:08 pm

This is the 292 synth board that is not working...

IC 41..44...39..should give 5v and -5v on pins 8 and 16...I only get -5v on both.

Only -ve on the CA3080.

What can cause this...?
Lam memorymoog.Sonic six.Vp330 mk1.SH101.OSCar.ARP odyssey..multivox mx3000.Solina stringsynth.polivox
ms20/50.Andromeda. OBX.
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Re: Trident mk 1 repair update

Post by snod_donkey » Thu Mar 24, 2011 11:14 am

sam wrote:This is the 292 synth board that is not working...

IC 41..44...39..should give 5v and -5v on pins 8 and 16...I only get -5v on both.

Only -ve on the CA3080.

What can cause this...?

First check at the power supply side that you have the +5v, if not then you either have a dead power rail or someting is dragging it down on one of the boards. Either a faulty tant if it has them or one or more of the ics may be duff. Could even just be a connection problem in the interconnects

first is there +5v at he power supply?

You've not said if there is +5v on some of the other ics, what about ic17 pin 16 ? Should be +5v there too

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Re: Trident mk 1 schems..?

Post by sam » Thu Mar 24, 2011 9:17 pm

Thank you for the advice.....But I have now fixed the problem, Ic 1 was faulty and some cold joints on a few 4558's that control the memory...forget which one's now.

It's a nice synth though but I am just getting used to it.

And thanks to everyone for the support...
Lam memorymoog.Sonic six.Vp330 mk1.SH101.OSCar.ARP odyssey..multivox mx3000.Solina stringsynth.polivox
ms20/50.Andromeda. OBX.
Prophet 5 Pro-one. Wasp.EMS AKS.

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Re: Trident mk 1 another issue

Post by sam » Sat Mar 26, 2011 9:34 am

I have been getting used to the synth and the initial problem is solved.

There is distortion on voice 4.

The connectors are fine.

What could be the likely cause....????
Lam memorymoog.Sonic six.Vp330 mk1.SH101.OSCar.ARP odyssey..multivox mx3000.Solina stringsynth.polivox
ms20/50.Andromeda. OBX.
Prophet 5 Pro-one. Wasp.EMS AKS.

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snod_donkey
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Re: Trident mk 1 another issue

Post by snod_donkey » Sat Mar 26, 2011 1:13 pm

sam wrote:I have been getting used to the synth and the initial problem is solved.

There is distortion on voice 4.

The connectors are fine.

What could be the likely cause....????

Trace that voice backwards from the "source mix" point. Looking at the circuit it shows voice 8 on "unit 7" ic5 feeds the main voice mix.

I would check the input on the 4558 for voice 4, this is fed from the output of the ssm filter... if its not distorted on the input of the 4558 but is distorted on its output then then 4558 may be duff

work backwards through the circuit each stage... if the input of the 4558 is distorted check at the input to the ssm

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Re: Trident mk 1 schems..?

Post by sam » Sat Mar 26, 2011 3:38 pm

Hey thanks again....I re soldered the pcb on the osc section and by magic it solved the problem... :D

I need to calibrate the filters next....

I think that all it's problems are solved ......Most of the problems were down to bad solder joints.

I have also recapped the power board.

AGAIN..Thanks for all the input..
Lam memorymoog.Sonic six.Vp330 mk1.SH101.OSCar.ARP odyssey..multivox mx3000.Solina stringsynth.polivox
ms20/50.Andromeda. OBX.
Prophet 5 Pro-one. Wasp.EMS AKS.

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Re: Trident mk 1 schems..?

Post by paugui » Sat Mar 26, 2011 4:11 pm

What's the concrete problem you have?

In mine I can't use the synth section all the time.
If I just use the memories it works 100%, but if I switch to manual mode or the 3 piano presets, it doesn't work as it should (seems to just produce a really long filter-sweep).
The strange thing is that the detune and filter knob works as they should on the preset mode...

Is this the same problem you have?

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Re: Trident mk 1 schems..?

Post by sam » Sat Mar 26, 2011 4:45 pm

It's related.....Take out the programmer board .....You will see a row of op amps (4885)

You should go over all the solder joints up to the connectors ....on the right...

It's only a bad solder joint...
Lam memorymoog.Sonic six.Vp330 mk1.SH101.OSCar.ARP odyssey..multivox mx3000.Solina stringsynth.polivox
ms20/50.Andromeda. OBX.
Prophet 5 Pro-one. Wasp.EMS AKS.

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