SY77 booting in a loop

Yamaha SY77 is a 16 voice multitimbral music workstation first produced by Yamaha Corporation in 1989. The SY77 is a synthesizer whose architecture combines AFM (Advanced Frequency Modulation) synthesis, AWM2 (Advanced Wave Memory 2) for ROM-borne sample-based synthesis, and the combination of these two methods christened Realtime Convolution and Modulation Synthesis (RCM).

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EB5AGV
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Re: SY77 booting in a loop

Unread post by EB5AGV » Mon Nov 12, 2018 1:19 pm

Rara wrote:
Mon Nov 12, 2018 1:10 pm
I dont think your mad, nothing wrong with saving a synth from the scrapyard, an extra bonus to if the fault is found and fixed. :D

Rara
:violin: 0-)
Thanks!

Yes, I think we need to repair more and buy less new items to save our poor planet (Y)

In fact, I fix electronics daily and I am happy of my small contribution to that cause :)

Jose
Jose Gavila

Yamaha SY77+SPX990, DGX660, Genos
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Miks
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Re: SY77 booting in a loop

Unread post by Miks » Mon Nov 12, 2018 2:18 pm

Hope you'll share your findings once you started repairing the synth... :wink: ((i))
My (key related) gear (in alphabetical order):
Ferrofish: B4000+
Kawai: K1 II
Korg: M1 (up'd to EX, w/ 'Cool Blue'), M1REX (w/ 'Cool Blue'), Poly-800
Roland: D-50, D-110, D-550, PG-1000
Yamaha: AW1600, DX7IID (w/ 'Cool Blue'), EX5R, RM50, RX5, SY99 (w/ 'Cool Blue'), TG500, TX-802, YMM2
Sector101: SYEMB05 (5x), SYEMB06 (3x), EXFLM2 (1kit), MCD Sweet16 (1x), WaveBlade 8MB Card (1x) & 1x Programmer Unit for WaveBlade
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Re: SY77 booting in a loop

Unread post by Horizonsound » Tue Dec 04, 2018 4:24 am

Hi Rara.

Im still allegedly too new to be allowed to reply to PMs.
Is your cpu a socketed chip or surface mount?
I am starting to think the older socketed ones had issues, along with the clock design, so they changed it for Rev 2.

Anthony.
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Re: SY77 booting in a loop

Unread post by Rara » Tue Dec 04, 2018 5:38 am

No worries, i forgot that ....
It's the ZIF socket (Jan 1990), last month I bought another DM1 of the same type (still on its way)
interesting thought, I'd love to know (as would many others) what the issue was.
Only way to tell possibly, would be schematics of the particular board revisions.

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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Re: SY77 booting in a loop

Unread post by Horizonsound » Tue Dec 04, 2018 8:18 am

I've bought a second DM1 as well and am waiting on it.
The symptoms I'm seeing are as if the CPU has an issue. Everything else is checking out.
Interesting, the only gear I have ever had problems with fixing is Yamaha, all processor related.
Everything else has been relatively straight forward (Roland, Korg etc..)
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Re: SY77 booting in a loop

Unread post by Rara » Tue Dec 04, 2018 10:02 am

Is it possible the firmware in the CPU has failed/failing.
Maybe reflash the cpu??? someone here has posted the firmware for all the chips on this type of board. i can't find it ....
datasheet for the cpu viewtopic.php?f=54&t=11658&p=69066&hili ... cpu#p69066

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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Re: SY77 booting in a loop

Unread post by Horizonsound » Wed Dec 05, 2018 8:33 am

Hi Rara,

When did you place your order for the DM1? Mine was shipped on 29-Nov, so wondering how long I am expecting to wait.

Anthony
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Re: SY77 booting in a loop

Unread post by Rara » Wed Dec 05, 2018 11:22 am

Hi, paid on November 17th, (I thought it was the 3rd for some odd reason :? ) I was getting anxious for nothing :roll:
I have no idea what date mine was actually shipped.

Allow a little extra time for silly season, hopefully 4 weeks tops.
Both coming from France shouldn't be too long,
Germany to Adelaide was 10 days for my floppy adapter, that was just before people go crazy with the shopping.

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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Re: SY77 booting in a loop

Unread post by Horizonsound » Wed Dec 05, 2018 12:22 pm

Go to auspost.com.au and put in the tracking number they provided. It’s more detailed than laposte.
Seems I’m a minimum of 2 weeks behind you.

Anthony .
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Re: SY77 booting in a loop

Unread post by Rara » Wed Dec 05, 2018 12:33 pm

I don't have a tracking tracking number :roll: It would seem they forgot to send me one.

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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