Question about Audio Players & Recorders

1 Answer

Yamaha sy77 booting fail

Mainboard dm1 rom ic 123 number removed of pcb, recplesment this ic. now not display show, so, dear can you help me? what can i do now please tell me.

Posted by shofi on

  • 5 more comments 
  • Larry Ng
    Larry Ng Nov 15, 2020

    the 77 had external ROM cards
    did you mean that, bet not.
    I think you dismantled the case totally
    and accessed the main PCB (removed above)
    and the got the wild idea to remove chips
    or sadly bought it like this a cannibalized PCB.
    no photos of your PCB posted, so be like 1000x hard to guess the condition of card.

    we can tell you what all chips do.. I can.
    the below PCB I circled the EPROM bank those are not ROMS but are EPROM with stickers on top to block light from erasing EPROM cells below the quartz window by accident.
    I use black tape on mine, 100% protected EPROM. (I used to test them in production)
    Eproms can Uv light erased and re programmed.
    the other big chip there are SRAM 256kbit. on side or eprom bank.

    That is the total OS there, embedded Operating system if you remove one
    the keyboard goes, dead.
    or 1/2 dead all.
    It would be best to have those old EPROM
    backed up. to a hex file. (or bin)
    (an eprom programmer device (tool) does that so easy)

    Some makers of EPROM (not mine)the charged gates inside can leak down when old.
    and fail. (we at Philips semi made some of these) our do not fail.(in time)

    see that yellow battery there will be bad.!!
    first thing to fix is ,new yellow battery.

    did Dm1 catch fire, why in the world remove it.? the sticker hides the chip name.
    remove cover and look.
    put back cover but use black tape.


    my guess 27C64, 8k x 8.
    you buy one
    erase it and
    re-program the OS code for that bank.
    but you do not have this code, and is a set for all 4 banks at once I bet,.
    machine code = code.
    in a factory of this device.
    we run checksums on the 4 banks, if fail
    we must erase them and re-program them back a new.


    we made these,.... back then.1990

  • Larry Ng
    Larry Ng Nov 15, 2020

    OP do you need advice on electronics repairs for sure relics, here is some
    31 years old today:
    1: those battery all of them are no good now.
    2; the electrolytic caps are no good either,
    called re-capping in the trade.
    3: if the EPROM bank fails check-SUM tests. they must be erased and reprogrammed or buy the whole PCB or full bank of EPROM used off ebay . where else but ebay has relic parts?
    i'd bet Yamaha does not support this now. yah.
    4: make sure (test) all power supplies inside DC are at spec an no high ripple,.
    and more no burned parts or traces PCB
    no boric acid leaking out of caps wreck it all.(bad to the bone this)
    no missing parts, is DM1, missing by magic, IDK.

    what does
    "removed"
    mean,, add word to that word to make it meaningful, like
    I lost the CHIP (EPROM)
    I remove it.
    Bought it like this missing key parts.
    it burned up, chip in quarts window looks burned. or casing of IC locks burned or warped. (any thing is possible in real world)
    I broke pins off the chip, by accident.
    see, post what the story is so we can be on the same page.
    or someone left the sticker off top of DM1.
    and set the PCB on the window sill and mr SUN erased the EPROM sure will for sure.
    have proof off all,
    the chip is all CMOS floating gate EPROM cells.(mosfet) they must not lose charge,
    or fails hard. ALL eproms, made. good ones do not. (on modern PC the life spec. is 100years. on FLASH, ) and no window on the to mess up the charge later in time. (bad actor)
    FLASH is EEPROM. actual. 2 "E"s

  • Larry Ng
    Larry Ng Nov 15, 2020

    we also made OTP , same chip no window
    called one time programmable.
    yours is the fancy package, ceramic + a quartz window.

    DM1 is the PCB model number stamped on PCB.

  • Larry Ng
    Larry Ng Nov 15, 2020

    off hand based on age
    the EPROM code loads into that huge (then)
    Toshiba SRAM bank and runs super fast there.
    HX 123 you meant the sticker shows that.
    I guess HX122 is the boot strap, eprom ,and main OS, and the 4 bank are voices or who knows what?
    ahhhhhh some never versions same year
    have totally different Eprom banks, less chips !
    so I give up lacking 1 photo of yours.

    here is a great page on restoringhttp://jvgavila.com/Yamaha_SY77_repair.h...

    and are OTP (no erasing possible) no re use.
    here is the newer PCB, not the same as Ver.0


  • Anonymous Nov 15, 2020

    the had DM2 board to, with custom Yamahachips
    there. but 2 versions of DM1. one with 4 chips and one with 2 chips in the EPROM bank.
    seen above missing top right.

  • Anonymous Nov 15, 2020

    listen and enjoy it.
    https://www.youtube.com/watch?v=UEIUIDQP...

    a master.!

  • Larry Ng
    Larry Ng Nov 15, 2020

    parts? take to him.https://syntaur.com/yamaha_sy.html

×

Ad

1 Answer

Larry Ng

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Audio Player... Master
  • 5,991 Answers

It is not a computer, ok/? posted to computers.
its keyboard, Music and SUPER OLD NOW.
Yamaha SY77 is a 16 voice multitimbral music workstation first produced by Yamaha Corporation in 1989.
if you removed ROM from keyboard, that kills the keyboard dead.

you question is not clear, at all.
you need to talk to Yamaha, it is their keyboard.

Posted on Dec 05, 2019

  • Larry Ng
    Larry Ng Nov 15, 2020

    the IC ROM chip is missing???
    you pulled it and lost it or you bought it like that.?
    some keyboards have 2nd ROM for more VOICES.
    first get the manual and may be hard to do 31 years later, google is your friend or
    as at yamaha.com

×

Ad

5 Related Answers

Fred Yearian

  • 5603 Answers

SOURCE: I HAVE A Yamaha PSR 260. About 8 years old.

This MAY be due to a key contact or button that is STUCK "on".

Often this will freeze the controller.

Make sure power adapter is the correct one... underpowered or incorrect ones cause trouble.

Posted on Mar 21, 2010

Ad

sanjay dixit

  • 117 Answers

SOURCE: n70 nokia on boot 2second

if its nokia n70 mobile phone, just reset to factory setting, all problem will be solved

Posted on Jan 13, 2011

Anonymous

  • 1 Answer

SOURCE: nokia n85 only show nokia and restart.

yes. this is the boot ic problem. pls. change the ic. this ic is stay near key pad ic. this is contains only 12 balls.

Posted on Apr 18, 2011

David Petry

  • 961 Answers

SOURCE: Intel D845GVSR has problem with

http://www.bing.com/shopping/intel-desktop-board-d845gvsr-motherboard-micro-atx-socket/specs/5672A45892DC2E147FCC?q=intel+d845gvsr&lpq=intel%20d845gvsr&FORM=HURE
This is your board and this is Intel's link for it:
http://www.intel.com/p/en_US/support/highlights/dsktpboards/d845gvsrIt
It has support to Win XP so, if you've upgraded to Vista or Windows 7, you're going to have problems. It has 3 PCI slots so, you could upgrade to a video or graphics card but there is really no support for the board past Win XP. You can buy one on Ebay:
http://shop.ebay.com/i.html?_nkw=d845gvsr

Posted on Jul 24, 2011

Matthew

  • 1 Answer

SOURCE: no sound on my SY77 yamaha synthesizer

1) Turn the power on.

2) While pressing the [VOICE] button, press and hold the [BANK D] button, then the [8] button. The SY77 will run the INITIAL TEST routine and display the Test Program Menu.

3) Press the [COPY] button. The SY77 will execute Test 48 'Factory Settings', automatically exit the test mode, and then return to play mode.

Posted on Apr 01, 2013

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have a yamaha psr 1100 show on display assertion failed


this is one of the most disturbing errors, the only easiest option is to replace the main motherboard, if you have a technician, check dry joints on the big ICs.

Jan 02, 2017 | Yamaha Music

1 Answer

My Canon C3100 boots and at the end of the boot display a blank screen. i need help


Dear
Pl. check the DDR SDRAM,BOOT ROM clean the contact surface with a dust free eraser,check HDD and its slot on MAIN CON PCB.
If possible reload OS.
Thanks.

Feb 08, 2015 | Canon Office Equipment & Supplies

1 Answer

No sound on my SY77 yamaha synthesizer


1) Turn the power on.

2) While pressing the [VOICE] button, press and hold the [BANK D] button, then the [8] button. The SY77 will run the INITIAL TEST routine and display the Test Program Menu.

3) Press the [COPY] button. The SY77 will execute Test 48 'Factory Settings', automatically exit the test mode, and then return to play mode.

Mar 31, 2013 | Music

1 Answer

My HP Compaq nc8000 will not start up correctly. When i hit the power button, only one green LED comes for a few seconds, then a yellow LED (which is the charge light) it sounds like the laptop is powering...


Check it is powering laptop,if not the jack has bad connection and not connecting to mainboard constantly,
Dobt thats what is happening in your case but need to rule it out for next step.
Remove the battery then try ac adaptor on its own.
Next try removing ram,insert one stick only,next sub it with other stick only,if still no good remove hard drive,you are attempting to get bios start screen to show up,if still no good you may be looking at mainboard power regulator ic fails,which are a real problem on some compaq models this also damages other components on the mainboard(google search will reveal what im on about)
Dont remember offhand but if its the type that has common mainboard fail its not worth repairing as the new boards always fail eventually due to same problem.
There are also light error codes in the back of the manual and available online to diagnose this by the type of lights showing up.

Feb 17, 2011 | HP Compaq Business nc8000 Notebook

1 Answer

Very recently my dad brought out the ol Yamaha SY77. I plugged in the power, pedal, and my headphones through the "breath" jack. I played the keys but I was unable hear any sound at all... complete newbie...


The "Breath" jack is for a "Breath controller" NOT headphones!!!

The breath controller was a pressure sensitve device you blow into that generates a signal to modulate the sound.

Put the headphones in the jack "PHONES"
I know, I have an SY77.

Sep 09, 2010 | Music

1 Answer

I HAVE A Yamaha PSR 260. About 8 years old. Recently it became defective.: Only the display lights up . No sound. No response to any button. When volume control is turned, I can hear the faint rustle on...


This MAY be due to a key contact or button that is STUCK "on".

Often this will freeze the controller.

Make sure power adapter is the correct one... underpowered or incorrect ones cause trouble.

Mar 20, 2010 | Yamaha Music

2 Answers

E000733-0001 the err means I have the same problem, the same error code: E000733-0001 on my Canon IR3100CN. I cannot pass to service mode...After I switch off & on, the display shows me the same...


E733-0001 Error Code
E733 and machine locks up with progress bar at 98% on boot up?
I would refer this error to a qualified service Tech.
Deals with replacing DC controller, Main Controller and Boot Rom as a set. Also, mention of replacing the Switching Regulator PCB Assembly if the previous failed to resolve.

May 27, 2009 | Canon imageRUNNER 3300 All-In-One Laser...

1 Answer

Nokia n95 8gb


i think after all that you should replaced the mainboard

Oct 20, 2008 | Nokia N95 Cellular Phone

Not finding what you are looking for?
Audio Players & Recorders Logo

Related Topics:

45 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audio Players & Recorders Experts

 Grubhead
Grubhead

Level 3 Expert

5700 Answers

The Knight
The Knight

Level 3 Expert

76466 Answers

Marvin
Marvin

Level 3 Expert

85239 Answers

Are you an Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...