Upgrading and restoring Casio FZ-1

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Miks
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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)
Yamaha: SY35, SY77, SY85, TX7, PSR 4600 - Roland: Juno106, D110, MC307, MKB200 (x2)
Kawai: XD5 / Korg: Poly800Mk2 (moog slayer mod)
Casio: CZ1000, CZ5000, FZ-1 / E-MU: ESI 2000
Digitech studio 400 / Alesis SR-16 / Boss: Dr550mk2, SE-70
Tascam Porta 5 HS, MM1 / Studiomaster Fusion
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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.
Yamaha: SY35, SY77, SY85, TX7, PSR 4600 - Roland: Juno106, D110, MC307, MKB200 (x2)
Kawai: XD5 / Korg: Poly800Mk2 (moog slayer mod)
Casio: CZ1000, CZ5000, FZ-1 / E-MU: ESI 2000
Digitech studio 400 / Alesis SR-16 / Boss: Dr550mk2, SE-70
Tascam Porta 5 HS, MM1 / Studiomaster Fusion
Modded SX Bass, fat wires, Dimarzio DP250 pickups, Ernie Ball strings / Gliga 1
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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.
Yamaha: SY35, SY77, SY85, TX7, PSR 4600 - Roland: Juno106, D110, MC307, MKB200 (x2)
Kawai: XD5 / Korg: Poly800Mk2 (moog slayer mod)
Casio: CZ1000, CZ5000, FZ-1 / E-MU: ESI 2000
Digitech studio 400 / Alesis SR-16 / Boss: Dr550mk2, SE-70
Tascam Porta 5 HS, MM1 / Studiomaster Fusion
Modded SX Bass, fat wires, Dimarzio DP250 pickups, Ernie Ball strings / Gliga 1
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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?

parametric
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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-)
Yamaha: SY35, SY77, SY85, TX7, PSR 4600 - Roland: Juno106, D110, MC307, MKB200 (x2)
Kawai: XD5 / Korg: Poly800Mk2 (moog slayer mod)
Casio: CZ1000, CZ5000, FZ-1 / E-MU: ESI 2000
Digitech studio 400 / Alesis SR-16 / Boss: Dr550mk2, SE-70
Tascam Porta 5 HS, MM1 / Studiomaster Fusion
Modded SX Bass, fat wires, Dimarzio DP250 pickups, Ernie Ball strings / Gliga 1
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