Upgrading and restoring Casio FZ-1

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Re: Upgrading and restoring Casio FZ-1

Unread post by Miks » Wed May 31, 2017 12:14 am

If one needs backlight repair:

https://www.backlight4you.com/EL-Panels ... ::912.html
Dr. Woland wrote:unplugging the EL will also disable midi?
If you disconnect the cable supplying the entire PCB - M5336 - ASIM board the answer is yes! IF you really want to 'disable' the backlight (take it out of order) then you may desolder the transformer ET16 on PCB - M5336 - ASIM board...
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Re: Upgrading and restoring Casio FZ-1

Unread post by Morning Guts » Wed May 31, 2017 2:50 am

Saul wrote:
Tue May 30, 2017 10:47 pm
Morning Guts wrote:
Tue May 30, 2017 9:15 pm
+1 for Dr. Woland's question.
Welcome to the forum :)

I assume you have the same problem with a Casio FZ-1 ?
Why thank you very kindly.

My recently purchased FZ is acting a little funny, and I'd like to take the backlight right out of the equation. I'm nervous to replace it with an LED backlight, as it seems everyone damages their displays during this procedure. So I think I'll just unplug the foil, and desolder the transformer it's attached to.

I love this synth immensely. There's simply not enough information online about it. Though the info available is quite detailed, so that's nice.

What might be helpful also is a list of behaviour the synth exhibits when the backlight starts to fail.
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Re: Upgrading and restoring Casio FZ-1

Unread post by Rara » Sun Mar 04, 2018 12:00 pm

Hello, sorry for the hugely late reply I had lost my login details and could not remember
them and looks like there's been a few changes since I last was here ... any how ....

I still have my FZ-1and still use it from time to time, at present toying with mellotron 400 samples with it,
the choir samples can sound quite eerie.
I have not had a problem with midi after cutting the tracks to the back light inverter.
if you do go that way, make absolutely sure the tracks are cut after the midi and before the inverter.
Study the schematic!!! I don't want to be responsible for a dead FZ.

I recently had a question pop into my head ...

Is the Hohner HS-1 a 1:1 replica of the FZ-1, or did the Germans do a little tweaking with it?
Did they by any chance improve upon the existing display in the FZ-1? those three ribbons cables and circuit board are a night mare.
Is it worthwhile trying to hassle casio enough to produce an aftermarket replacement (if possible) if enough interest was generated?
If Alesis can still have replacement screens for an sr-16 why not Casio? (wishful thinking)
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Re: Upgrading and restoring Casio FZ-1

Unread post by Morning Guts » Mon Jun 11, 2018 10:39 pm

Rara wrote:
Sun Mar 04, 2018 12:00 pm
Hello, sorry for the hugely late reply I had lost my login details and could not remember
them and looks like there's been a few changes since I last was here ... any how ....

I still have my FZ-1and still use it from time to time, at present toying with mellotron 400 samples with it,
the choir samples can sound quite eerie.
I have not had a problem with midi after cutting the tracks to the back light inverter.
if you do go that way, make absolutely sure the tracks are cut after the midi and before the inverter.
Study the schematic!!! I don't want to be responsible for a dead FZ.

I recently had a question pop into my head ...

Is the Hohner HS-1 a 1:1 replica of the FZ-1, or did the Germans do a little tweaking with it?
Did they by any chance improve upon the existing display in the FZ-1? those three ribbons cables and circuit board are a night mare.
Is it worthwhile trying to hassle casio enough to produce an aftermarket replacement (if possible) if enough interest was generated?
If Alesis can still have replacement screens for an sr-16 why not Casio? (wishful thinking)

Thanks very much for all the great info here.

I've just cannibalized an iphone 4 light to use as a backlight, and I power it from the 12v rail that used to power the floppy drive. The corresponding 5v rail now powers an HXC floppy emulator, so I'm in business there.

On the advice of Miks (and Graham Meredith) I simply desoldered the little transformer (ET16) from the MIDI board (M5336 - ASIM). MIDI is working just fine. Pretty great.

My question now is, long term, is there any problem with simply taking out the transformer, instead of cutting the traces and putting a jumper in? I'm fairly new to this, so excuse my ignorance, but that circuit that the ET16 transformer was a part of is now just a dead end. Are there dangers to that?

Also, you mentioned waaaay back about some noise in the audio path, which I'm also experiencing. The FZ's have a wonderfully dirty filter, but mine (I have two) have a rather unpleasant distortion toward the tail of notes, when the filter is closed, or close-to-closed.

I haven't done enough tests with the PSU yet to determine whether it needs revamping (I assume it does), but I envision replacing the filter caps, transistors, and bridge rectifiers to improve things overall. You think I can expect an improvement in the noise in the audio path?

I'm not sure what my next step would be after that.

Anyway, I know this is a really old thread, but if you ever happen to pop by again and have any thoughts, I'd really appreciate it.

And again, thank you for all your help thus far. This process would not have been possible without you and a few others. This synth is really too great to be abandoned. Never played anything like it.
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Re: Upgrading and restoring Casio FZ-1

Unread post by Rara » Tue Jun 12, 2018 3:45 am

Hi,
Noise in the audio ... If this were a casio cz, I'd say check the DPDT relay on the audio board as well, which is a common problem.
I don't know off hand ... if the same thing applies to the FZ. I have the service manual, I'll have a look later.

Rara 0-)

Edit: if replacing caps, please don't use anything made in china. i made that mistake and had to do replace them again in gear i was working on.
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Re: Upgrading and restoring Casio FZ-1

Unread post by Rara » Thu Jun 14, 2018 12:57 pm

I've been looking at the service manual, even though part numbers are listed on the pcb schematic i cant find them in the parts list ..... :?

Any way, going backwards from the mix out -----> capacitor -----> op-amp ------> relay
one of those or all may need looking at.

(i had an op-amp done on my sy-35)

The noise I mentioned earlier which i was experiencing, was only when I was loading samples either by floppy drive or via midi.
otherwise it was generally quiet.

My FZ1 is in need of major surgery again, i need to find another LCD from somewhere,
mine is almost too far gone to be readable due to the ribbon cables ( :roll: )
the back light I made out lasted the LCD. otherwise it'll be retired from use. clean out the key contacts (common fault)
replace all the tact switches (again :roll: ) and change some capacitors.

Rara 0-)

Edit: relay on the schematic (PCB-M5336-MA2M) is indicated as G2V-1002H, in the parts list its listed as G2VN01971C. :?
Last edited by Rara on Thu Jun 14, 2018 1:26 pm, edited 1 time in total.
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Re: Upgrading and restoring Casio FZ-1

Unread post by parametric » Thu Jun 14, 2018 1:17 pm

Rara -

I did find this site awhile back . . . . https://www.ebay.co.uk/itm/Casio-CZ-1-C ... SwSutaRDTE

He's only listing CZ models . . . BUT, perhaps it's worth an email to ask about the FZ?

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Re: Upgrading and restoring Casio FZ-1

Unread post by Rara » Thu Jun 14, 2018 1:27 pm

parametric wrote:
Thu Jun 14, 2018 1:17 pm
Rara -

I did find this site awhile back . . . . https://www.ebay.co.uk/itm/Casio-CZ-1-C ... SwSutaRDTE

He's only listing CZ models . . . BUT, perhaps it's worth an email to ask about the FZ?

parametric
Thanks for the tip, i will jump on there right now and ask :-)

Rara 0-)
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Re: Upgrading and restoring Casio FZ-1

Unread post by Morning Guts » Tue Apr 09, 2019 5:14 am

Rara wrote:
Thu Jun 14, 2018 12:57 pm
I've been looking at the service manual, even though part numbers are listed on the pcb schematic i cant find them in the parts list ..... :?

Any way, going backwards from the mix out -----> capacitor -----> op-amp ------> relay
one of those or all may need looking at.

(i had an op-amp done on my sy-35)

The noise I mentioned earlier which i was experiencing, was only when I was loading samples either by floppy drive or via midi.
otherwise it was generally quiet.

My FZ1 is in need of major surgery again, i need to find another LCD from somewhere,
mine is almost too far gone to be readable due to the ribbon cables ( :roll: )
the back light I made out lasted the LCD. otherwise it'll be retired from use. clean out the key contacts (common fault)
replace all the tact switches (again :roll: ) and change some capacitors.

Rara 0-)

Edit: relay on the schematic (PCB-M5336-MA2M) is indicated as G2V-1002H, in the parts list its listed as G2VN01971C. :?

Thanks for all the help. I haven't dug into the noise issue yet, but I'm hoping it's that op amp.

Before I do, the noise behaviour really seems to be coming from the VCF. For instance, if the Release on my VCF ends sooner than the release on my VCA, I get a gungy, gross, not at all musical noise at the end of the VCF's Release.

Further, I get this behaviour from both the line output in the back, as well as the headphone jack in the front. Identical from both outputs.

Does this shed any further light? Thanks so much for all your help so far. Just wanting to narrow it down a little, and try to remedy the problem myself instead of sending it to my tech.
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Re: Upgrading and restoring Casio FZ-1

Unread post by Rara » Tue Apr 09, 2019 7:28 am

It could be the VCF, also check the audio board (the CZ's have the same noise issue with midi sysex transfers)
there's a relay on the audio board which is common to fail on a CZ (1000,3000,5000) all identical relays, if the FZ
has the same thing check that as well. Also check there's no broken grounds anywhere.

Sorry I can't be much more help at the moment, I've decommissioned my entire setup and the nas with all info related to it.

Rara :-)
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Re: Upgrading and restoring Casio FZ-1

Unread post by Rara » Tue Jun 11, 2019 11:26 am

Version 2 of an LED back light for my FZ1 :-)

This is an improvement of what is demonstrated on the following link....
(which is a vast improvement of my original idea, so the internet goes full circle on this one
cheers to the the writer on vintagesynth ;-) )

http://forum.vintagesynth.com/viewtopic ... 90#p789525

I have cut down an Iphone 4 back light to fit the rear of the LCD housing.
and soldered on some dupont connectors to the ribbon cable.
The Iphone 4 back light is a perfect fit thickness wise only 1mm.

Trimming of the back light looks a little rough around the edges, it wont be seen when put back together. Backlights are difficult to cut.
IMG_0012a.jpg
IMG_0012a.jpg (96.73 KiB) Viewed 169 times

I found a 5vdc to 16vdc inverter to run the new back light.
IMG_0014a.jpg
IMG_0014a.jpg (78.93 KiB) Viewed 169 times

Using the same dupont connectors on the inverter as well, using the original wire from the original inverter/el back light to plug in top the connectors on the new inverter.

Heat shrink tube and a piece of plastic twisty wire to add some strength to the backlight ribbon cable.

I have colour corrected the picture below, so what you see on screen is pretty close to what in see in person.

So far the back light has been stable, no issues as yet, (knock wood). Dropped out pixels may be able to be fixed with a thin piece of open cell foam to press the ribbon cables back on to the rear of the lcd screen
IMG_0016B.jpg
IMG_0016B.jpg (83.33 KiB) Viewed 169 times
I'm happy with the screen as is, no need i think for any filters to change the colour.

Rara 0-)
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Re: Upgrading and restoring Casio FZ-1

Unread post by Saul » Tue Jun 11, 2019 12:02 pm

Very nice job Rara ((i)) ((i)) ((i))

Even for someone who does not own a Casio FZ-1 it is such a fantastic thing for me to be able to see people finding all sorts of ways to repair these great vintage keyboards (Y)
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Re: Upgrading and restoring Casio FZ-1

Unread post by Rara » Tue Jun 11, 2019 1:25 pm

Thanks :-)
It's a beast worthy of spending some time on fixing however I think this is delaying the inevitable. Once the ribbon cables start separating from the driver board or the LCD its self, nothing can be done to fix it. Then starts to become hard to read and eventually fail completely. enjoy it while I can :-)

Rara 0-)
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Re: Upgrading and restoring Casio FZ-1

Unread post by Saul » Tue Jun 11, 2019 2:08 pm

I think I might have asked this before but is there no way to take the display to an external screen?
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Re: Upgrading and restoring Casio FZ-1

Unread post by Rara » Tue Jun 11, 2019 2:18 pm

Version 2 of this back is good in theory however it still does not fit inside the synth.
so needs more work.
the rear half of the LCD house now has to have some material ground out to make the
back light flush with the housing. I am not doing that to an original part, I might look into
getting that part 3D printed.

while i was reassembling, the ribbon on the back light snapped off anyway. so know I need to make another. Good thing I ordered more than one. ((i))

In all honesty, because of this night mare LCD screen if any one considers buying an FZ-1
buy the FZ10 or 20 rack mount instead. you'll be saving your selves the hassles of this and
the reoccurring dead keys.

Rara 0-)
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