Quote:
Originally Posted by
mouse_shoes
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right, this is what i'm asking about. searching online produces contradictory results - some says it's impossible to source parts and techs refuse to service it, some say the parts are common and it's very easy to service. honestly just curious, it would be good to know!
I'll answer this as a my own general concerns with all electronics rather than the OB8 specifically
The problem with any electronics thats 40years old is deterioration of things due to age.
For example the PCBs themselves can become conductive internally through Conductive anodic filaments (CAF) this is esentially impurities in the glass fibre used to make the boards in the first place(if they are FR4) becoming conductive. There is also conductive Salt growth on the surface of the boards. The breaks down the surface insulation resistance (SIR) this would have been caused by manual handling during manufacture as these problems were unheard of in the 1980s. If they are made of SRBP then the boards can delaminate in damp or humid conditions.
In Something like an OB8 you will have SSM or CEM chips that were phased out in the 1990s and where virtually unobtainable and those that were had been harvested from lesser equipment so no guarentee of their condition and the prices where often extortionate.
A lot of these are now available as remanufactured for a sensible price.
However there is more than CEM chips.
You have programmed Roms the EEpromms used in the 1980's have been obsolete for 20years certain more common versions can be obtained from component brokers that essentially bought the stock up and charge premium price to sell to companies that still rely on old technology in their equipment rather than redesigning it. But unless you have the BIn Hex files and a EEProm programmer you are screwed!
Then there are matched transitor packages and arrays.
Used in antilog amps for 1V/Oct. This technology is obsolete as modern manufactures would now use a PIC or a CPU to control the circuit.
You may also encounter OP Amps ICs and Logic ICs that are also obsolete.
You can design a circuit to do the same thing but it not the realm of the average repair guy.
Assuming that all your electronics is Good then you have proprietry parts
This is things like modwheels or joysticks knobs and slider caps Switch Buttons Very often bought in from a manufacturer than made them exclusively for a particular company.
Then there's the keyboard Pratt Reed, Fatar ? Pratt Reed do a lot of the Bushings springs and dampers but you'll struggle to find replacements for damaged or Missing Keys.
Then there are the key contacts themselves.
Depending on the Vintage and manufacturer of your "Vintage" equipment the key contacts could be either sprung metal or Rubberized bubble contacts.
You have options with sprung contacts as you can usually engineer something to work. If however you have perrished rubber contacts on a 35-40 year old synth the chances of finding replacements is next to zero.
Your only option would be to either find a company to remake them for you.
Which the tooling costs alone would exceed the value of most "Classic Keyboards" Or modify/engineer a keyboard from a donor synth into it.
There is always a way to fix something It is only the cost that makes it prohibative