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Thread

Broken MSM5232?

2010-07-09 by Johan Nilsson

Hi!

I have been browsing around this mailinglist but haven't found a solution to my problem (but some help to get this far!). However, I think it is the right place to post my questions.

I got an EX-800 that my friend found in the garbage. He has kept it for some time and tested it the last time one year ago when he says it worked fine. He is not very much into making music and thought I would have more use for it. The user interface (buttons and LED displays seem to work fine), but I don't get much sound out of it. With some settings I get some low level filtered noise.

After checking the MIDI in with bank change messages I opened the device. Looks very clean inside. I have backtracked the circuit to the MSM5232. I just have a mutimeter right now, but this is what I got so far:

- The outputs (2'-1 ... 16'-2) of MSM5232 (pin 28-31 and 33-36) are constantly 4.6V no matter if keys are pressed or not.

- The control inputs (E0 ... E7) of MSM5232 (pin 24-27 and pin 37-40) give -4.3V before key on and -0.3V when key on.

- The clock signals (clk1 and clk2) seem to be OK. DC 2.5V and about 1MHz.

- VDD1 (pin 3) = 5.0V

- VDD2 (pin 41) = 5.0V

- VSS1 (pin 21) = 0.0V

- VSS2 (pin 23) = -5.0V

- VSS3 (pin 32) = -5.0V

- WR (pin 12) of MSM5232 is 5.0V no matter how I send notes. I cannot see any pulses since I don't have a scope. If this signal is active low, I guess the pulses are to short to affect the DC reading. I should meassure this with a scope, but this seems like my small hope for non broken MSM5232. In the datasheet for the MSM5232 it looks like this signal should be 2.4 - 0.8 V, am I right?

- 8 bit data bus (D0 ... D7) of MSM5232 (pin 4-11) is hard to measure without scope, but there is some action going on when keys are pressed. They wobble around 2.5V. Should messure these with a scope to see if they look like digital control signals, but I have no reason to expect other than that they are healthy.

- ALE of MSM5232 (pin 13) has a steady signal of high frequency with a average voltage of 1.5V. Seems right.

- RST of MSM5232 has a voltage of about 4.4V that lowers some mV when keys are pressed. Guess those are correct reset signals and the signal is active high.

- Address inputs (A0 ... A3) of MSM5232 (pin 14-17) are about 2.5V and change some mV when keyes are pressed.

Anybody have some clues? Did I miss something? Is my MSM5232 broken or is it possible that the input to WR is messed up?

Thankful for any ideas!

Regards Johan Nilsson

Re: [korgpolyex] Broken MSM5232?

2010-07-09 by Gordon JC Pearce

On Fri, 2010-07-09 at 07:54 +0200, Johan Nilsson wrote:

Show quoted textHide quoted text

>
> - WR (pin 12) of MSM5232 is 5.0V no matter how I send notes. I cannot
> see any pulses since I don't have a scope. If this signal is active
> low, I guess the pulses are to short to affect the DC reading. I
> should meassure this with a scope, but this seems like my small hope
> for non broken MSM5232. In the datasheet for the MSM5232 it looks like
> this signal should be 2.4 - 0.8 V, am I right?

The /WR pin is active low, so it's pulled to around the voltage you say
to tell the chip to look at what's on the data bus. This pulse lasts
for about a microsecond, and you'd need to be quick to even see that
with an oscilloscope. One handy trick is to set the scope to triggered
sweep and use the trigger input to watch things like /WR pulses - if
the /WR pulse happens the scope will sweep.

You *have* tried programming up a basic patch with both oscillators on
and the filter wide open with no modulation, haven't you?

Gordon MM0YEQ

Re: [korgpolyex] Broken MSM5232?

2010-07-09 by Daniel Forró

Maybe not relevant, but are you sure it's not the software problem before checking the hardware? Isn't there a garbage in RAM? I would start with loading the proper data. As for hardware, maybe check the internal battery. If the voltage is OK, sometimes with Korg machines battery disconnecting helped, as RAM reset. Then connect again, load data and it's possible it will work...

Daniel Forro

Show quoted textHide quoted text

On 9 Jul 2010, at 2:54 PM, Johan Nilsson wrote:

Hi!

I have been browsing around this mailinglist but haven't found a solution to my problem (but some help to get this far!). However, I think it is the right place to post my questions.

I got an EX-800 that my friend found in the garbage. He has kept it for some time and tested it the last time one year ago when he says it worked fine. He is not very much into making music and thought I would have more use for it. The user interface (buttons and LED displays seem to work fine), but I don't get much sound out of it. With some settings I get some low level filtered noise.

After checking the MIDI in with bank change messages I opened the device. Looks very clean inside. I have backtracked the circuit to the MSM5232. I just have a mutimeter right now, but this is what I got so far:

- The outputs (2'-1 ... 16'-2) of MSM5232 (pin 28-31 and 33-36) are constantly 4.6V no matter if keys are pressed or not.
- The control inputs (E0 ... E7) of MSM5232 (pin 24-27 and pin 37-40) give -4.3V before key on and -0.3V when key on.
- The clock signals (clk1 and clk2) seem to be OK. DC 2.5V and about 1MHz.
- VDD1 (pin 3) = 5.0V
- VDD2 (pin 41) = 5.0V
- VSS1 (pin 21) = 0.0V
- VSS2 (pin 23) = -5.0V
- VSS3 (pin 32) = -5.0V
- WR (pin 12) of MSM5232 is 5.0V no matter how I send notes. I cannot see any pulses since I don't have a scope. If this signal is active low, I guess the pulses are to short to affect the DC reading. I should meassure this with a scope, but this seems like my small hope for non broken MSM5232. In the datasheet for the MSM5232 it looks like this signal should be 2.4 - 0.8 V, am I right?
- 8 bit data bus (D0 ... D7) of MSM5232 (pin 4-11) is hard to measure without scope, but there is some action going on when keys are pressed. They wobble around 2.5V. Should messure these with a scope to see if they look like digital control signals, but I have no reason to expect other than that they are healthy.
- ALE of MSM5232 (pin 13) has a steady signal of high frequency with a average voltage of 1.5V. Seems right.
- RST of MSM5232 has a voltage of about 4.4V that lowers some mV when keys are pressed. Guess those are correct reset signals and the signal is active high.
- Address inputs (A0 ... A3) of MSM5232 (pin 14-17) are about 2.5V and change some mV when keyes are pressed.

Anybody have some clues? Did I miss something? Is my MSM5232 broken or is it possible that the input to WR is messed up?

Thankful for any ideas!

Regards Johan Nilsson

Re: [korgpolyex] Broken MSM5232?

2010-07-09 by Johan Nilsson

Thanks for the super fast replies!

I have tried to program a basic patch but since the synth is new to me I am not 100% I made it correct (just 99%). I have tried all patches in memory though.

I am not sure it is a software problem and I have not tried the battery thing. Good points. Please give me a hint on what to upload and how.

Regards Johan

Show quoted textHide quoted text

2010/7/9 Daniel Forró <dan.for@...>

Maybe not relevant, but are you sure it's not the software problem before checking the hardware? Isn't there a garbage in RAM? I would start with loading the proper data. As for hardware, maybe check the internal battery. If the voltage is OK, sometimes with Korg machines battery disconnecting helped, as RAM reset. Then connect again, load data and it's possible it will work...

Daniel Forro

On 9 Jul 2010, at 2:54 PM, Johan Nilsson wrote:

Hi!

I have been browsing around this mailinglist but haven't found a solution to my problem (but some help to get this far!). However, I think it is the right place to post my questions.

I got an EX-800 that my friend found in the garbage. He has kept it for some time and tested it the last time one year ago when he says it worked fine. He is not very much into making music and thought I would have more use for it. The user interface (buttons and LED displays seem to work fine), but I don't get much sound out of it. With some settings I get some low level filtered noise.

After checking the MIDI in with bank change messages I opened the device. Looks very clean inside. I have backtracked the circuit to the MSM5232. I just have a mutimeter right now, but this is what I got so far:

- The outputs (2'-1 ... 16'-2) of MSM5232 (pin 28-31 and 33-36) are constantly 4.6V no matter if keys are pressed or not.
- The control inputs (E0 ... E7) of MSM5232 (pin 24-27 and pin 37-40) give -4.3V before key on and -0.3V when key on.

- The clock signals (clk1 and clk2) seem to be OK. DC 2.5V and about 1MHz.
- VDD1 (pin 3) = 5.0V
- VDD2 (pin 41) = 5.0V
- VSS1 (pin 21) = 0.0V
- VSS2 (pin 23) = -5.0V
- VSS3 (pin 32) = -5.0V
- WR (pin 12) of MSM5232 is 5.0V no matter how I send notes. I cannot see any pulses since I don't have a scope. If this signal is active low, I guess the pulses are to short to affect the DC reading. I should meassure this with a scope, but this seems like my small hope for non broken MSM5232. In the datasheet for the MSM5232 it looks like this signal should be 2.4 - 0.8 V, am I right?

- 8 bit data bus (D0 ... D7) of MSM5232 (pin 4-11) is hard to measure without scope, but there is some action going on when keys are pressed. They wobble around 2.5V. Should messure these with a scope to see if they look like digital control signals, but I have no reason to expect other than that they are healthy.

- ALE of MSM5232 (pin 13) has a steady signal of high frequency with a average voltage of 1.5V. Seems right.
- RST of MSM5232 has a voltage of about 4.4V that lowers some mV when keys are pressed. Guess those are correct reset signals and the signal is active high.

- Address inputs (A0 ... A3) of MSM5232 (pin 14-17) are about 2.5V and change some mV when keyes are pressed.

Anybody have some clues? Did I miss something? Is my MSM5232 broken or is it possible that the input to WR is messed up?

Thankful for any ideas!

Regards Johan Nilsson

Re: [korgpolyex] Broken MSM5232?

2010-07-09 by joe peak

If the batteries die out then the whole operation data is erased. This could be the case with you. Reloading the Data originally was done by a cassette tape. You can find this data in wave file format in the files section.

Files

>

1) Poly-800

>

Patches and patch dumps
Audio Cassette of Original Patches.wav

The users manual in the file section will tell you how to load data to the EX-800.

Good luck and let us know if you fix it!!

J.

Show quoted textHide quoted text

--- On Thu, 7/8/10, Johan Nilsson <ur.johan.nilsson@...> wrote:

From: Johan Nilsson <ur.johan.nilsson@...>
Subject: Re: [korgpolyex] Broken MSM5232?
To: korgpolyex@yahoogroups.com
Date: Thursday, July 8, 2010, 11:57 PM

Thanks for the super fast replies!

I have tried to program a basic patch but since the synth is new to me I am not 100% I made it correct (just 99%). I have tried all patches in memory though.

I am not sure it is a software problem and I have not tried the battery thing. Good points. Please give me a hint on what to upload and how.

Regards Johan

2010/7/9 Daniel Forró <dan.for@tiscali. cz>

Maybe not relevant, but are you sure it's not the software problem before checking the hardware? Isn't there a garbage in RAM? I would start with loading the proper data. As for hardware, maybe check the internal battery. If the voltage is OK, sometimes with Korg machines battery disconnecting helped, as RAM reset. Then connect again, load data and it's possible it will work...

Daniel Forro

On 9 Jul 2010, at 2:54 PM, Johan Nilsson wrote:

Hi!

I have been browsing around this mailinglist but haven't found a solution to my problem (but some help to get this far!). However, I think it is the right place to post my questions.

I got an EX-800 that my friend found in the garbage. He has kept it for some time and tested it the last time one year ago when he says it worked fine. He is not very much into making music and thought I would have more use for it. The user interface (buttons and LED displays seem to work fine), but I don't get much sound out of it. With some settings I get some low level filtered noise.

After checking the MIDI in with bank change messages I opened the device. Looks very clean inside. I have backtracked the circuit to the MSM5232. I just have a mutimeter right now, but this is what I got so far:

- The outputs (2'-1 ... 16'-2) of MSM5232 (pin 28-31 and 33-36) are constantly 4.6V no matter if keys are pressed or not.
- The control inputs (E0 ... E7) of MSM5232 (pin 24-27 and pin 37-40) give -4.3V before key on and -0.3V when key on.

- The clock signals (clk1 and clk2) seem to be OK. DC 2.5V and about 1MHz.
- VDD1 (pin 3) = 5.0V
- VDD2 (pin 41) = 5.0V
- VSS1 (pin 21) = 0.0V
- VSS2 (pin 23) = -5.0V
- VSS3 (pin 32) = -5.0V
- WR (pin 12) of MSM5232 is 5.0V no matter how I send notes. I cannot see any pulses since I don't have a scope. If this signal is active low, I guess the pulses are to short to affect the DC reading. I should meassure this with a scope, but this seems like my small hope for non broken MSM5232. In the datasheet for the MSM5232 it looks like this signal should be 2.4 - 0.8 V, am I right?

- 8 bit data bus (D0 ... D7) of MSM5232 (pin 4-11) is hard to measure without scope, but there is some action going on when keys are pressed. They wobble around 2.5V. Should messure these with a scope to see if they look like digital control signals, but I have no reason to expect other than that they are healthy.

- ALE of MSM5232 (pin 13) has a steady signal of high frequency with a average voltage of 1.5V. Seems right.
- RST of MSM5232 has a voltage of about 4.4V that lowers some mV when keys are pressed. Guess those are correct reset signals and the signal is active high.

- Address inputs (A0 ... A3) of MSM5232 (pin 14-17) are about 2.5V and change some mV when keyes are pressed.

Anybody have some clues? Did I miss something? Is my MSM5232 broken or is it possible that the input to WR is messed up?

Thankful for any ideas!

Regards Johan Nilsson

Re: [korgpolyex] Broken MSM5232?

2010-07-09 by joe peak

Sorry......Didn't mean to copy link location on that audio cassette of original patches .wav.....

Do not click that link! just go to the files section and download the file.......play it into the poly while having the poly loading the wav.........

;-P

J.

Show quoted textHide quoted text

--- On Fri, 7/9/10, joe peak <lovgh2000@...> wrote:

From: joe peak <lovgh2000@...>
Subject: Re: [korgpolyex] Broken MSM5232?
To: korgpolyex@yahoogroups.com
Date: Friday, July 9, 2010, 12:28 AM

If the batteries die out then the whole operation data is erased. This could be the case with you. Reloading the Data originally was done by a cassette tape. You can find this data in wave file format in the files section.

Files > 1) Poly-800 > Patches and patch dumps
Audio Cassette of Original Patches.wav

The users manual in the file section will tell you how to load data to the EX-800.

Good luck and let us know if you fix it!!

J.

--- On Thu, 7/8/10, Johan Nilsson <ur.johan.nilsson@ gmail.com> wrote:

From: Johan Nilsson <ur.johan.nilsson@ gmail.com>
Subject: Re: [korgpolyex] Broken MSM5232?
To: korgpolyex@yahoogro ups.com
Date: Thursday, July 8, 2010, 11:57 PM

Thanks for the super fast replies!

I have tried to program a basic patch but since the synth is new to me I am not 100% I made it correct (just 99%). I have tried all patches in memory though.

I am not sure it is a software problem and I have not tried the battery thing. Good points. Please give me a hint on what to upload and how.

Regards Johan

2010/7/9 Daniel Forró <dan.for@tiscali. cz>

Maybe not relevant, but are you sure it's not the software problem before checking the hardware? Isn't there a garbage in RAM? I would start with loading the proper data. As for hardware, maybe check the internal battery. If the voltage is OK, sometimes with Korg machines battery disconnecting helped, as RAM reset. Then connect again, load data and it's possible it will work...

Daniel Forro

On 9 Jul 2010, at 2:54 PM, Johan Nilsson wrote:

Hi!

I have been browsing around this mailinglist but haven't found a solution to my problem (but some help to get this far!). However, I think it is the right place to post my questions.

I got an EX-800 that my friend found in the garbage. He has kept it for some time and tested it the last time one year ago when he says it worked fine. He is not very much into making music and thought I would have more use for it. The user interface (buttons and LED displays seem to work fine), but I don't get much sound out of it. With some settings I get some low level filtered noise.

After checking the MIDI in with bank change messages I opened the device. Looks very clean inside. I have backtracked the circuit to the MSM5232. I just have a mutimeter right now, but this is what I got so far:

- The outputs (2'-1 ... 16'-2) of MSM5232 (pin 28-31 and 33-36) are constantly 4.6V no matter if keys are pressed or not.
- The control inputs (E0 ... E7) of MSM5232 (pin 24-27 and pin 37-40) give -4.3V before key on and -0.3V when key on.

- The clock signals (clk1 and clk2) seem to be OK. DC 2.5V and about 1MHz.
- VDD1 (pin 3) = 5.0V
- VDD2 (pin 41) = 5.0V
- VSS1 (pin 21) = 0.0V
- VSS2 (pin 23) = -5.0V
- VSS3 (pin 32) = -5.0V
- WR (pin 12) of MSM5232 is 5.0V no matter how I send notes. I cannot see any pulses since I don't have a scope. If this signal is active low, I guess the pulses are to short to affect the DC reading. I should meassure this with a scope, but this seems like my small hope for non broken MSM5232. In the datasheet for the MSM5232 it looks like this signal should be 2.4 - 0.8 V, am I right?

- 8 bit data bus (D0 ... D7) of MSM5232 (pin 4-11) is hard to measure without scope, but there is some action going on when keys are pressed. They wobble around 2.5V. Should messure these with a scope to see if they look like digital control signals, but I have no reason to expect other than that they are healthy.

- ALE of MSM5232 (pin 13) has a steady signal of high frequency with a average voltage of 1.5V. Seems right.
- RST of MSM5232 has a voltage of about 4.4V that lowers some mV when keys are pressed. Guess those are correct reset signals and the signal is active high.

- Address inputs (A0 ... A3) of MSM5232 (pin 14-17) are about 2.5V and change some mV when keyes are pressed.

Anybody have some clues? Did I miss something? Is my MSM5232 broken or is it possible that the input to WR is messed up?

Thankful for any ideas!

Regards Johan Nilsson

Re: [korgpolyex] Broken MSM5232?

2010-07-09 by Johan Nilsson

Thanks! I'll try this when I get home.

Just to verify:

This is the sound file I should send to the synth?

Files > 1) Poly-800 > Patches and patch dumps > Audio Cassette of Original Patches.wav

Does it matter if the battery is run out? In theory, could the battery be removed as long as the synth is powered on or should I replace the battery just to be sure?

Regards, Johan

Show quoted textHide quoted text

2010/7/9 joe peak <lovgh2000@...>

Sorry......Didn't mean to copy link location on that audio cassette of original patches .wav.....

Do not click that link! just go to the files section and download the file.......play it into the poly while having the poly loading the wav.........

;-P

J.

--- On Fri, 7/9/10, joe peak <lovgh2000@...> wrote:

From: joe peak <lovgh2000@...>

Subject: Re: [korgpolyex] Broken MSM5232?
To: korgpolyex@yahoogroups.com
Date: Friday, July 9, 2010, 12:28 AM

If the batteries die out then the whole operation data is erased. This could be the case with you. Reloading the Data originally was done by a cassette tape. You can find this data in wave file format in the files section.

Files > 1) Poly-800 > Patches and patch dumps
Audio Cassette of Original Patches.wav

The users manual in the file section will tell you how to load data to the EX-800.

Good luck and let us know if you fix it!!

J.

--- On Thu, 7/8/10, Johan Nilsson <ur.johan.nilsson@ gmail.com> wrote:

From: Johan Nilsson <ur.johan.nilsson@ gmail.com>
Subject: Re: [korgpolyex] Broken MSM5232?
To: korgpolyex@yahoogro ups.com

Date: Thursday, July 8, 2010, 11:57 PM

Thanks for the super fast replies!

I have tried to program a basic patch but since the synth is new to me I am not 100% I made it correct (just 99%). I have tried all patches in memory though.

I am not sure it is a software problem and I have not tried the battery thing. Good points. Please give me a hint on what to upload and how.

Regards Johan

2010/7/9 Daniel Forró <dan.for@tiscali. cz>

Maybe not relevant, but are you sure it's not the software problem before checking the hardware? Isn't there a garbage in RAM? I would start with loading the proper data. As for hardware, maybe check the internal battery. If the voltage is OK, sometimes with Korg machines battery disconnecting helped, as RAM reset. Then connect again, load data and it's possible it will work...

Daniel Forro

On 9 Jul 2010, at 2:54 PM, Johan Nilsson wrote:

Hi!

I have been browsing around this mailinglist but haven't found a solution to my problem (but some help to get this far!). However, I think it is the right place to post my questions.

I got an EX-800 that my friend found in the garbage. He has kept it for some time and tested it the last time one year ago when he says it worked fine. He is not very much into making music and thought I would have more use for it. The user interface (buttons and LED displays seem to work fine), but I don't get much sound out of it. With some settings I get some low level filtered noise.

After checking the MIDI in with bank change messages I opened the device. Looks very clean inside. I have backtracked the circuit to the MSM5232. I just have a mutimeter right now, but this is what I got so far:

- The outputs (2'-1 ... 16'-2) of MSM5232 (pin 28-31 and 33-36) are constantly 4.6V no matter if keys are pressed or not.
- The control inputs (E0 ... E7) of MSM5232 (pin 24-27 and pin 37-40) give -4.3V before key on and -0.3V when key on.

- The clock signals (clk1 and clk2) seem to be OK. DC 2.5V and about 1MHz.
- VDD1 (pin 3) = 5.0V
- VDD2 (pin 41) = 5.0V
- VSS1 (pin 21) = 0.0V
- VSS2 (pin 23) = -5.0V
- VSS3 (pin 32) = -5.0V
- WR (pin 12) of MSM5232 is 5.0V no matter how I send notes. I cannot see any pulses since I don't have a scope. If this signal is active low, I guess the pulses are to short to affect the DC reading. I should meassure this with a scope, but this seems like my small hope for non broken MSM5232. In the datasheet for the MSM5232 it looks like this signal should be 2.4 - 0.8 V, am I right?

- 8 bit data bus (D0 ... D7) of MSM5232 (pin 4-11) is hard to measure without scope, but there is some action going on when keys are pressed. They wobble around 2.5V. Should messure these with a scope to see if they look like digital control signals, but I have no reason to expect other than that they are healthy.

- ALE of MSM5232 (pin 13) has a steady signal of high frequency with a average voltage of 1.5V. Seems right.
- RST of MSM5232 has a voltage of about 4.4V that lowers some mV when keys are pressed. Guess those are correct reset signals and the signal is active high.

- Address inputs (A0 ... A3) of MSM5232 (pin 14-17) are about 2.5V and change some mV when keyes are pressed.

Anybody have some clues? Did I miss something? Is my MSM5232 broken or is it possible that the input to WR is messed up?

Thankful for any ideas!

Regards Johan Nilsson

Re: [korgpolyex] Broken MSM5232?

2010-07-09 by Michael Hawkins

Hello Johan,

since you have an EX-800, you can also send a MIDI bulk sysex dump message to your EX-800 (in case the audio method becomes too painful or difficult).

Go into the files section, then section 2) EX-800 then "Patches and Patch Dumps" then download EX800.syx which is the original Korg EX-800 sysex dump file.

Best of luck.

Mike.

Show quoted textHide quoted text

From: Johan Nilsson <ur.johan.nilsson@...>
To: korgpolyex@yahoogroups.com
Sent: Fri, July 9, 2010 4:27:49 AM
Subject: Re: [korgpolyex] Broken MSM5232?

Thanks! I'll try this when I get home.

Just to verify:

This is the sound file I should send to the synth?

Files > 1) Poly-800 > Patches and patch dumps > Audio Cassette of Original Patches.wav

Does it matter if the battery is run out? In theory, could the battery be removed as long as the synth is powered on or should I replace the battery just to be sure?

Regards, Johan

2010/7/9 joe peak <lovgh2000@yahoo. com>

Sorry......Didn't mean to copy link location on that audio cassette of original patches .wav.....

Do not click that link! just go to the files section and download the file.......play it into the poly while having the poly loading the wav.........

;-P

J.

--- On Fri, 7/9/10, joe peak <lovgh2000@yahoo. com> wrote:

From: joe peak <lovgh2000@yahoo. com>

Subject: Re: [korgpolyex] Broken MSM5232?
To: korgpolyex@yahoogro ups.com
Date: Friday, July 9, 2010, 12:28 AM

If the batteries die out then the whole operation data is erased. This could be the case with you. Reloading the Data originally was done by a cassette tape. You can find this data in wave file format in the files section.

Files > 1) Poly-800 > Patches and patch dumps
Audio Cassette of Original Patches.wav

The users manual in the file section will tell you how to load data to the EX-800.

Good luck and let us know if you fix it!!

J.

--- On Thu, 7/8/10, Johan Nilsson <ur.johan.nilsson@ gmail.com> wrote:

From: Johan Nilsson <ur.johan.nilsson@ gmail.com>
Subject: Re: [korgpolyex] Broken MSM5232?
To: korgpolyex@yahoogro ups.com

Date: Thursday, July 8, 2010, 11:57 PM

Thanks for the super fast replies!

I have tried to program a basic patch but since the synth is new to me I am not 100% I made it correct (just 99%). I have tried all patches in memory though.

I am not sure it is a software problem and I have not tried the battery thing. Good points. Please give me a hint on what to upload and how.

Regards Johan

2010/7/9 Daniel Forró <dan.for@tiscali. cz>

Maybe not relevant, but are you sure it's not the software problem before checking the hardware? Isn't there a garbage in RAM? I would start with loading the proper data. As for hardware, maybe check the internal battery. If the voltage is OK, sometimes with Korg machines battery disconnecting helped, as RAM reset. Then connect again, load data and it's possible it will work...

Daniel Forro

On 9 Jul 2010, at 2:54 PM, Johan Nilsson wrote:

Hi!

I have been browsing around this mailinglist but haven't found a solution to my problem (but some help to get this far!). However, I think it is the right place to post my questions.

I got an EX-800 that my friend found in the garbage. He has kept it for some time and tested it the last time one year ago when he says it worked fine. He is not very much into making music and thought I would have more use for it. The user interface (buttons and LED displays seem to work fine), but I don't get much sound out of it. With some settings I get some low level filtered noise.

After checking the MIDI in with bank change messages I opened the device. Looks very clean inside. I have backtracked the circuit to the MSM5232. I just have a mutimeter right now, but this is what I got so far:

- The outputs (2'-1 ... 16'-2) of MSM5232 (pin 28-31 and 33-36) are constantly 4.6V no matter if keys are pressed or not.
- The control inputs (E0 ... E7) of MSM5232 (pin 24-27 and pin 37-40) give -4.3V before key on and -0.3V when key on.

- The clock signals (clk1 and clk2) seem to be OK. DC 2.5V and about 1MHz.
- VDD1 (pin 3) = 5.0V
- VDD2 (pin 41) = 5.0V
- VSS1 (pin 21) = 0.0V
- VSS2 (pin 23) = -5.0V
- VSS3 (pin 32) = -5.0V
- WR (pin 12) of MSM5232 is 5.0V no matter how I send notes. I cannot see any pulses since I don't have a scope. If this signal is active low, I guess the pulses are to short to affect the DC reading. I should meassure this with a scope, but this seems like my small hope for non broken MSM5232. In the datasheet for the MSM5232 it looks like this signal should be 2.4 - 0.8 V, am I right?

- 8 bit data bus (D0 ... D7) of MSM5232 (pin 4-11) is hard to measure without scope, but there is some action going on when keys are pressed. They wobble around 2.5V. Should messure these with a scope to see if they look like digital control signals, but I have no reason to expect other than that they are healthy.

- ALE of MSM5232 (pin 13) has a steady signal of high frequency with a average voltage of 1.5V. Seems right.
- RST of MSM5232 has a voltage of about 4.4V that lowers some mV when keys are pressed. Guess those are correct reset signals and the signal is active high.

- Address inputs (A0 ... A3) of MSM5232 (pin 14-17) are about 2.5V and change some mV when keyes are pressed.

Anybody have some clues? Did I miss something? Is my MSM5232 broken or is it possible that the input to WR is messed up?

Thankful for any ideas!

Regards Johan Nilsson

Re: [korgpolyex] Broken MSM5232?

2010-07-09 by Johan Nilsson

Hello again everybody

I have sent the audio file via tape input and now the synth sings! It seem to work fine! Thank you very very much!
Next thing might be a Hawk upgrade...

Johan

Show quoted textHide quoted text

2010/7/9 Michael Hawkins <korgpolyex800@...>

Hello Johan,

since you have an EX-800, you can also send a MIDI bulk sysex dump message to your EX-800 (in case the audio method becomes too painful or difficult).

Go into the files section, then section 2) EX-800 then "Patches and Patch Dumps" then download EX800.syx which is the original Korg EX-800 sysex dump file.

Best of luck.

Mike.

From: Johan Nilsson <ur.johan.nilsson@...>

To: korgpolyex@yahoogroups.com
Sent: Fri, July 9, 2010 4:27:49 AM

Subject: Re: [korgpolyex] Broken MSM5232?

Thanks! I'll try this when I get home.

Just to verify:
This is the sound file I should send to the synth?
Files > 1) Poly-800 > Patches and patch dumps > Audio Cassette of Original Patches.wav

Does it matter if the battery is run out? In theory, could the battery be removed as long as the synth is powered on or should I replace the battery just to be sure?

Regards, Johan

2010/7/9 joe peak <lovgh2000@yahoo. com>

Sorry......Didn't mean to copy link location on that audio cassette of original patches .wav.....

Do not click that link! just go to the files section and download the file.......play it into the poly while having the poly loading the wav.........

;-P

J.

--- On Fri, 7/9/10, joe peak <lovgh2000@yahoo. com> wrote:

From: joe peak <lovgh2000@yahoo. com>

Subject: Re: [korgpolyex] Broken MSM5232?
To: korgpolyex@yahoogro ups.com
Date: Friday, July 9, 2010, 12:28 AM

If the batteries die out then the whole operation data is erased. This could be the case with you. Reloading the Data originally was done by a cassette tape. You can find this data in wave file format in the files section.

Files > 1) Poly-800 > Patches and patch dumps
Audio Cassette of Original Patches.wav

The users manual in the file section will tell you how to load data to the EX-800.

Good luck and let us know if you fix it!!

J.

--- On Thu, 7/8/10, Johan Nilsson <ur.johan.nilsson@ gmail.com> wrote:

From: Johan Nilsson <ur.johan.nilsson@ gmail.com>
Subject: Re: [korgpolyex] Broken MSM5232?
To: korgpolyex@yahoogro ups.com

Date: Thursday, July 8, 2010, 11:57 PM

Thanks for the super fast replies!

I have tried to program a basic patch but since the synth is new to me I am not 100% I made it correct (just 99%). I have tried all patches in memory though.

I am not sure it is a software problem and I have not tried the battery thing. Good points. Please give me a hint on what to upload and how.

Regards Johan

2010/7/9 Daniel Forró <dan.for@tiscali. cz>

Maybe not relevant, but are you sure it's not the software problem before checking the hardware? Isn't there a garbage in RAM? I would start with loading the proper data. As for hardware, maybe check the internal battery. If the voltage is OK, sometimes with Korg machines battery disconnecting helped, as RAM reset. Then connect again, load data and it's possible it will work...

Daniel Forro

On 9 Jul 2010, at 2:54 PM, Johan Nilsson wrote:

Hi!

I have been browsing around this mailinglist but haven't found a solution to my problem (but some help to get this far!). However, I think it is the right place to post my questions.

I got an EX-800 that my friend found in the garbage. He has kept it for some time and tested it the last time one year ago when he says it worked fine. He is not very much into making music and thought I would have more use for it. The user interface (buttons and LED displays seem to work fine), but I don't get much sound out of it. With some settings I get some low level filtered noise.

After checking the MIDI in with bank change messages I opened the device. Looks very clean inside. I have backtracked the circuit to the MSM5232. I just have a mutimeter right now, but this is what I got so far:

- The outputs (2'-1 ... 16'-2) of MSM5232 (pin 28-31 and 33-36) are constantly 4.6V no matter if keys are pressed or not.
- The control inputs (E0 ... E7) of MSM5232 (pin 24-27 and pin 37-40) give -4.3V before key on and -0.3V when key on.

- The clock signals (clk1 and clk2) seem to be OK. DC 2.5V and about 1MHz.
- VDD1 (pin 3) = 5.0V
- VDD2 (pin 41) = 5.0V
- VSS1 (pin 21) = 0.0V
- VSS2 (pin 23) = -5.0V
- VSS3 (pin 32) = -5.0V
- WR (pin 12) of MSM5232 is 5.0V no matter how I send notes. I cannot see any pulses since I don't have a scope. If this signal is active low, I guess the pulses are to short to affect the DC reading. I should meassure this with a scope, but this seems like my small hope for non broken MSM5232. In the datasheet for the MSM5232 it looks like this signal should be 2.4 - 0.8 V, am I right?

- 8 bit data bus (D0 ... D7) of MSM5232 (pin 4-11) is hard to measure without scope, but there is some action going on when keys are pressed. They wobble around 2.5V. Should messure these with a scope to see if they look like digital control signals, but I have no reason to expect other than that they are healthy.

- ALE of MSM5232 (pin 13) has a steady signal of high frequency with a average voltage of 1.5V. Seems right.
- RST of MSM5232 has a voltage of about 4.4V that lowers some mV when keys are pressed. Guess those are correct reset signals and the signal is active high.

- Address inputs (A0 ... A3) of MSM5232 (pin 14-17) are about 2.5V and change some mV when keyes are pressed.

Anybody have some clues? Did I miss something? Is my MSM5232 broken or is it possible that the input to WR is messed up?

Thankful for any ideas!

Regards Johan Nilsson

Re: Broken MSM5232? it's only the battery!

2010-07-09 by k9k9dog

hey, i'm no tecchy, ut i just saw this, and it sounds like what
happened when my internal battery died: it defaults to some noise-
based setting. that means that none of the memories remain on power off,
and it lways goes back to this sound; as far as i recall.

hey, may be worth a try! in which case, you'd be advised to replace the battery setup altogether and solder in a pc motherboard battery holder, which'll work better.

it worked for me.

sounds like you got really lucky; who chucks a Korg MIDI rack synthesizer inot the rubbish?????