If you have to replace a bad cap on a PCB...., what makes you think that the other ones, with same age and build quality, are in perfect working condition?

In my experience, replacing all capacitors, beyond the psu ones, makes a night and day difference not only to my ears, you get a trustable working machine with glorious sound for years to come.

It's about the sound, in the end, and reliability.

This is my way, and not necessarily the way for everybody.

As example, JP-8000 may put some light.

Peace

José Juan?

El dom, 5 feb 2023, 12:02, Martin Tarenskeen <m.tarenskeen@...> escribió:

On Feb 4, 2023, at 5:31, José Juan wrote:

"Electrolytic capacitors are dead on most 80s Yamaha Roland Korg gear."

From reactions from some of the more experienced experts here I think I can conclude that statement highly exxagerated?

MT



Verzonden vanaf mijn Huawei mobiele telefoon

-------- Oorspronkelijk bericht --------
Onderwerp: Re: [YamahaDX] TX802 troubleshooting
Van: PeWe
Aan: [email protected],danforcz@...
Cc:

Hi Daniel !

I agree 100%!

Since my friend (tech) and me started to do inhouse repairs and service for all my gear many years ago, we never ever had to replace ALL capacitors in any machine, regardless of brand and type.
Especially the old Yamaha gear was and still is very reliable.
I?m 1st owner,- and my TX816 is still intact, my DX7mkII never failed and younger devices like TG77 and TG500 work flawlessly.
Needles to say the same rules for the KX-76, KX-5, D-1500 and REV-7.
Necessary service was usually battery change and soldering in battery holders, replacing a by roadies physically damaged display, tact switch replacements and PSU overhaul for REV-7.
The TX816 might need a single new LED on one of the TF-1 modules and I think about replacing the original PSU w/ this one (if at all) ...


WHEN we had to replace aged capacitors in other gear,- these belonged to the PSU always.
AKAI S-1000 PSU capacitors leaked in both machines, S-1100 PSUs are different and didn?t.

Ribbon cables and sockets are often culprits ...
When cables and sockets aren?t available anymore, removing socket and solder the ribbon directly to the board was the simple solution.
That happened w/ a Oberheim DPX-1 not playing a tone, not loading disks and showing cryptic stuff in display.

So, PSU and ALL connections (soldering joints, sockets, plugs, ribbon cables) have to work 100% perfect before replacing anything else.

Well, this thread is about TX802 which I don?t use, but I?d say, repair and service on electronic gear of that era isn?t soooo special and urgently depending on brand/model.
Finding the cause of failure is the most difficult and time consuming,- and I won?t replace anything before being sure what it really is.
The common buyer and user of used vintage gear is often not able to identify cause of failure because of lack of tech skills and missing tools for diagnostics (and repair).
To save time it?s sometimes better buying a 2nd used machine and swap boards, then use the better one for work and the other for parts in future.

:-)

P.

Am 04.02.2023 um 03:37 schrieb Daniel Forró via :

It is not recommended to replace all caps, only the bad ones. Service experts say: If it works, leave it so.

Daniel Forró

On Feb 4, 2023, at 5:31, José Juan <josejuangallego@...> wrote:

Electrolytic capacitors are dead on most 80s Yamaha Roland Korg gear.

Virenfrei.