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Having problems after battery replacement

Having problems after battery replacement

2009-03-05 by mekonin

Hello good people from polysix support group.
I have one pretty annoying problem with my beloved polysix and I was hoping if you could help me.

I got it back from repair few weeks ago.
I had the notorious battery problem, and the tech guy fixed almost everything except one thing.

He replaced the chip which I think is controling the memory, and it is draining too much power.
We measured almost 30mA, which he says is way too much.
So instantly, when I put the fresh Lithium battery, the voltage goes from 3.3V (or something) to 2.8V, and it takes a few days for the battery to be completely depleted (the synth is off all the time).
He is 99% sure it is that chip that is causing the problem,
and he suggests me that I find an original one, because he was unable to.

The chip is the replacement for TC-5514, it's 2114 I think.

I have checked if D15 diode is facing the right way, if it's not then the battery would be routed to ground with 100 ohm which is something about 30mA..
But it's facing the right way.


I looked at the datasheet for the original TC5514 memory chip and it says it needs up to 180mA in operating and 10mA in standby. The 2114 also uses 10mA in standby but 100mA in operating mode, so it's a newer and more efficient chip. It doesn't make sense that it's this chip that's making the problem.


Thanks in advance guys.
Cheers,

Milan

RE: [PolySix] Having problems after battery replacement

2009-03-05 by Andrew Jury

Hi Milan,

 

You should take the board back and tell him he hasn't fixed it properly! ;-)


 

Seriously, it does sound like there is an excessive load across the
terminals of the battery. Before you do anything else then please make sure
that R91 and C40 have been moved from circuit. D15 should not have been
touched and the new diode (should be a 1N4148 or similar) is soldered in
place of R40 with the anode facing toward the anode of D15. If the new diode
is connected in reverse then the 5V rail will be connected to the battery
whilst the Polysix is switched on! (and also the battery will never power
pin 18 of the SRAM, if it is not destroyed already!). 

 

If all the above look right connect an ohm meter across the battery
terminals making sure the Polysix is disconnected from the mains and the
cell is also removed. What resistance do you get? If it is below 1K ohm then
start pulling the SRAM and re-measuring. IC25 and C36 are also candidates
for failure as they are directly connected to the battery whilst the power
is off.

 

Let us know what you find.

 

Cheers,

Andy
Show quoted textHide quoted text
From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
mekonin
Sent: 05 March 2009 08:44
To: PolySix@yahoogroups.com
Subject: [PolySix] Having problems after battery replacement

 

Hello good people from polysix support group.
I have one pretty annoying problem with my beloved polysix and I was hoping
if you could help me.

I got it back from repair few weeks ago.
I had the notorious battery problem, and the tech guy fixed almost
everything except one thing.

He replaced the chip which I think is controling the memory, and it is
draining too much power.
We measured almost 30mA, which he says is way too much.
So instantly, when I put the fresh Lithium battery, the voltage goes from
3.3V (or something) to 2.8V, and it takes a few days for the battery to be
completely depleted (the synth is off all the time).
He is 99% sure it is that chip that is causing the problem,
and he suggests me that I find an original one, because he was unable to.

The chip is the replacement for TC-5514, it's 2114 I think.

I have checked if D15 diode is facing the right way, if it's not then the
battery would be routed to ground with 100 ohm which is something about
30mA..
But it's facing the right way.

I looked at the datasheet for the original TC5514 memory chip and it says it
needs up to 180mA in operating and 10mA in standby. The 2114 also uses 10mA
in standby but 100mA in operating mode, so it's a newer and more efficient
chip. It doesn't make sense that it's this chip that's making the problem.

Thanks in advance guys.
Cheers,

Milan





[Non-text portions of this message have been removed]

Re: [PolySix] Having problems after battery replacement

2009-03-05 by Chromatest J. Pantsmaker

Maybe a bent lead on the ram, shorting itself?

I agree with Andy.  The guy didn't fix it right.

On Thu, Mar 5, 2009 at 7:03 AM, Andrew Jury <andy@networkjabber.com> wrote:
> Hi Milan,
>
>
>
> You should take the board back and tell him he hasn't fixed it properly! ;-)
>
>
>
>
> Seriously, it does sound like there is an excessive load across the
> terminals of the battery. Before you do anything else then please make sure
> that R91 and C40 have been moved from circuit. D15 should not have been
> touched and the new diode (should be a 1N4148 or similar) is soldered in
> place of R40 with the anode facing toward the anode of D15. If the new diode
> is connected in reverse then the 5V rail will be connected to the battery
> whilst the Polysix is switched on! (and also the battery will never power
> pin 18 of the SRAM, if it is not destroyed already!).
>
>
>
> If all the above look right connect an ohm meter across the battery
> terminals making sure the Polysix is disconnected from the mains and the
> cell is also removed. What resistance do you get? If it is below 1K ohm then
> start pulling the SRAM and re-measuring. IC25 and C36 are also candidates
> for failure as they are directly connected to the battery whilst the power
> is off.
>
>
>
> Let us know what you find.
>
>
>
> Cheers,
>
> Andy
>
>
>
> From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
> mekonin
> Sent: 05 March 2009 08:44
> To: PolySix@yahoogroups.com
> Subject: [PolySix] Having problems after battery replacement
> - Show quoted text -
>
>
> Hello good people from polysix support group.
> I have one pretty annoying problem with my beloved polysix and I was hoping
> if you could help me.
>
> I got it back from repair few weeks ago.
> I had the notorious battery problem, and the tech guy fixed almost
> everything except one thing.
>
> He replaced the chip which I think is controling the memory, and it is
> draining too much power.
> We measured almost 30mA, which he says is way too much.
> So instantly, when I put the fresh Lithium battery, the voltage goes from
> 3.3V (or something) to 2.8V, and it takes a few days for the battery to be
> completely depleted (the synth is off all the time).
> He is 99% sure it is that chip that is causing the problem,
> and he suggests me that I find an original one, because he was unable to.
>
> The chip is the replacement for TC-5514, it's 2114 I think.
>
> I have checked if D15 diode is facing the right way, if it's not then the
> battery would be routed to ground with 100 ohm which is something about
> 30mA..
> But it's facing the right way.
>
> I looked at the datasheet for the original TC5514 memory chip and it says it
> needs up to 180mA in operating and 10mA in standby. The 2114 also uses 10mA
> in standby but 100mA in operating mode, so it's a newer and more efficient
> chip. It doesn't make sense that it's this chip that's making the problem.
>
> Thanks in advance guys.
> Cheers,
>
> Milan
>
>
>
>
>
> [Non-text portions of this message have been removed]
> - Show quoted text -
>
>
> ------------------------------------
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6Yahoo! Groups Links
>
>
>
>



-- 
.sig
-Chromatest J. Pantsmaker
http://www.chromatest.net

Re: Having problems after battery replacement

2009-03-18 by mekonin

Hello guys, sorry for the late response...

First of all, I forgot to mention that I know almost nothing about electronics and schematics, and I also need to learn how to use unimers properly. 
I gave my best to decipher the schemes but I think the best way is for you to look at the pictures of the board here:



http://img17.imageshack.us/img17/2954/img0020uwi.jpg
http://img5.imageshack.us/img5/5016/img0021c.jpg


I can tell that C40 has been removed and that R91 has been replaced but I could not find D15 (I presume that's the one right under R91).

Cheers,
Milan


--- In PolySix@yahoogroups.com, "Chromatest J. Pantsmaker" <chromatest@...> wrote:
Show quoted textHide quoted text
>
> Maybe a bent lead on the ram, shorting itself?
> 
> I agree with Andy.  The guy didn't fix it right.
> 
> On Thu, Mar 5, 2009 at 7:03 AM, Andrew Jury <andy@...> wrote:
> > Hi Milan,
> >
> >
> >
> > You should take the board back and tell him he hasn't fixed it properly! ;-)
> >
> >
> >
> >
> > Seriously, it does sound like there is an excessive load across the
> > terminals of the battery. Before you do anything else then please make sure
> > that R91 and C40 have been moved from circuit. D15 should not have been
> > touched and the new diode (should be a 1N4148 or similar) is soldered in
> > place of R40 with the anode facing toward the anode of D15. If the new diode
> > is connected in reverse then the 5V rail will be connected to the battery
> > whilst the Polysix is switched on! (and also the battery will never power
> > pin 18 of the SRAM, if it is not destroyed already!).
> >
> >
> >
> > If all the above look right connect an ohm meter across the battery
> > terminals making sure the Polysix is disconnected from the mains and the
> > cell is also removed. What resistance do you get? If it is below 1K ohm then
> > start pulling the SRAM and re-measuring. IC25 and C36 are also candidates
> > for failure as they are directly connected to the battery whilst the power
> > is off.
> >
> >
> >
> > Let us know what you find.
> >
> >
> >
> > Cheers,
> >
> > Andy
> >
> >
> >
> > From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
> > mekonin
> > Sent: 05 March 2009 08:44
> > To: PolySix@yahoogroups.com
> > Subject: [PolySix] Having problems after battery replacement
> > - Show quoted text -
> >
> >
> > Hello good people from polysix support group.
> > I have one pretty annoying problem with my beloved polysix and I was hoping
> > if you could help me.
> >
> > I got it back from repair few weeks ago.
> > I had the notorious battery problem, and the tech guy fixed almost
> > everything except one thing.
> >
> > He replaced the chip which I think is controling the memory, and it is
> > draining too much power.
> > We measured almost 30mA, which he says is way too much.
> > So instantly, when I put the fresh Lithium battery, the voltage goes from
> > 3.3V (or something) to 2.8V, and it takes a few days for the battery to be
> > completely depleted (the synth is off all the time).
> > He is 99% sure it is that chip that is causing the problem,
> > and he suggests me that I find an original one, because he was unable to.
> >
> > The chip is the replacement for TC-5514, it's 2114 I think.
> >
> > I have checked if D15 diode is facing the right way, if it's not then the
> > battery would be routed to ground with 100 ohm which is something about
> > 30mA..
> > But it's facing the right way.
> >
> > I looked at the datasheet for the original TC5514 memory chip and it says it
> > needs up to 180mA in operating and 10mA in standby. The 2114 also uses 10mA
> > in standby but 100mA in operating mode, so it's a newer and more efficient
> > chip. It doesn't make sense that it's this chip that's making the problem.
> >
> > Thanks in advance guys.
> > Cheers,
> >
> > Milan
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> > - Show quoted text -
> >
> >
> > ------------------------------------
> >
> > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6Yahoo! Groups Links
> >
> >
> >
> >
> 
> 
> 
> -- 
> .sig
> -Chromatest J. Pantsmaker
> http://www.chromatest.net
>

RE: [PolySix] Re: Having problems after battery replacement

2009-03-18 by Andrew Jury

Hi Milan,

 

This is always going to be difficult if electronics isn't your speciality,
so do not get too hung up about it. I find this mixture art and science is
not a good combination. I am poor musician but pretty good at electronics, I
suspect it is the other way around for you. Not sure you can be good at
both! Anyway.

 

I don't want to be rude or disrespectful to the repairer, but this falls way
short of the standards I would expect a board to be return to me in (plus it
still has a fault). What I can tell you is that the diodes both appear to be
correctly inserted from the topside, although I can't vouch for the bottom.
I am not sure what the red goo is under the battery, but I suspect this is
some kind of insulation? Perhaps we have a very slow leak to ground through
this material which is causing the battery to drain. I personally would have
mounted the battery 90 degrees to the current position with the body
slightly 'floating' above the print surface (negative facing forward).

 

One big observation is that it looks like the SRAM IC is in back to front!
There is usually a dot marking pin 1 of the device. This seems to be where
pin 10 is if you look carefully (this is the chip next to the orange
connector). Could you take a mega close up picture of this device so we can
have a good look at it. It must admit if this was the case then the print on
top of the chip is upside down and the patch memory wouldn't work. But that
sure as hell looks like the pin 1 dot to me!!

 

If all else fails send me a private message as I may be able to take a look
at the board for you and try and salvage something!!

 

Cheers,
Andy
Show quoted textHide quoted text
From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
mekonin
Sent: 18 March 2009 09:55
To: PolySix@yahoogroups.com
Subject: [PolySix] Re: Having problems after battery replacement

 

Hello guys, sorry for the late response...

First of all, I forgot to mention that I know almost nothing about
electronics and schematics, and I also need to learn how to use unimers
properly. 
I gave my best to decipher the schemes but I think the best way is for you
to look at the pictures of the board here:

http://img17.imageshack.us/img17/2954/img0020uwi.jpg
http://img5.imageshack.us/img5/5016/img0021c.jpg

I can tell that C40 has been removed and that R91 has been replaced but I
could not find D15 (I presume that's the one right under R91).

Cheers,
Milan

--- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> ,
"Chromatest J. Pantsmaker" <chromatest@...> wrote:
>
> Maybe a bent lead on the ram, shorting itself?
> 
> I agree with Andy. The guy didn't fix it right.
> 
> On Thu, Mar 5, 2009 at 7:03 AM, Andrew Jury <andy@...> wrote:
> > Hi Milan,
> >
> >
> >
> > You should take the board back and tell him he hasn't fixed it properly!
;-)
> >
> >
> >
> >
> > Seriously, it does sound like there is an excessive load across the
> > terminals of the battery. Before you do anything else then please make
sure
> > that R91 and C40 have been moved from circuit. D15 should not have been
> > touched and the new diode (should be a 1N4148 or similar) is soldered in
> > place of R40 with the anode facing toward the anode of D15. If the new
diode
> > is connected in reverse then the 5V rail will be connected to the
battery
> > whilst the Polysix is switched on! (and also the battery will never
power
> > pin 18 of the SRAM, if it is not destroyed already!).
> >
> >
> >
> > If all the above look right connect an ohm meter across the battery
> > terminals making sure the Polysix is disconnected from the mains and the
> > cell is also removed. What resistance do you get? If it is below 1K ohm
then
> > start pulling the SRAM and re-measuring. IC25 and C36 are also
candidates
> > for failure as they are directly connected to the battery whilst the
power
> > is off.
> >
> >
> >
> > Let us know what you find.
> >
> >
> >
> > Cheers,
> >
> > Andy
> >
> >
> >
> > From: PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>
[mailto:PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> ] On
Behalf Of
> > mekonin
> > Sent: 05 March 2009 08:44
> > To: PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> 
> > Subject: [PolySix] Having problems after battery replacement
> > - Show quoted text -
> >
> >
> > Hello good people from polysix support group.
> > I have one pretty annoying problem with my beloved polysix and I was
hoping
> > if you could help me.
> >
> > I got it back from repair few weeks ago.
> > I had the notorious battery problem, and the tech guy fixed almost
> > everything except one thing.
> >
> > He replaced the chip which I think is controling the memory, and it is
> > draining too much power.
> > We measured almost 30mA, which he says is way too much.
> > So instantly, when I put the fresh Lithium battery, the voltage goes
from
> > 3.3V (or something) to 2.8V, and it takes a few days for the battery to
be
> > completely depleted (the synth is off all the time).
> > He is 99% sure it is that chip that is causing the problem,
> > and he suggests me that I find an original one, because he was unable
to.
> >
> > The chip is the replacement for TC-5514, it's 2114 I think.
> >
> > I have checked if D15 diode is facing the right way, if it's not then
the
> > battery would be routed to ground with 100 ohm which is something about
> > 30mA..
> > But it's facing the right way.
> >
> > I looked at the datasheet for the original TC5514 memory chip and it
says it
> > needs up to 180mA in operating and 10mA in standby. The 2114 also uses
10mA
> > in standby but 100mA in operating mode, so it's a newer and more
efficient
> > chip. It doesn't make sense that it's this chip that's making the
problem.
> >
> > Thanks in advance guys.
> > Cheers,
> >
> > Milan
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> > - Show quoted text -
> >
> >
> > ------------------------------------
> >
> > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6Yahoo! Groups
Links
> >
> >
> >
> >
> 
> 
> 
> -- 
> .sig
> -Chromatest J. Pantsmaker
> http://www.chromatest.net
>





[Non-text portions of this message have been removed]

Re: [PolySix] Re: Having problems after battery replacement

2009-03-18 by Chromatest J. Pantsmaker

After staring at it for a minute, it looks like the SRAM IC is in
correct to me.  I can vaguely make out a "pin-one" notch at the end of
the IC towards the bottom of the picture.

On Wed, Mar 18, 2009 at 3:49 AM, Andrew Jury <andy@networkjabber.com> wrote:
> Hi Milan,

> One big observation is that it looks like the SRAM IC is in back to front!
> There is usually a dot marking pin 1 of the device. This seems to be where
> pin 10 is if you look carefully (this is the chip next to the orange
> connector). Could you take a mega close up picture of this device so we can
> have a good look at it. It must admit if this was the case then the print on
> top of the chip is upside down and the patch memory wouldn't work. But that
> sure as hell looks like the pin 1 dot to me!!

-- 
.sig
-Chromatest J. Pantsmaker
http://www.chromatest.net

RE: [PolySix] Re: Having problems after battery replacement

2009-03-18 by Andrew Jury

Ha! That's why I wanted a larger picture as I couldn't make it out. You have
to admit it does look like the pin 1 dot at the wrong end, but this would
mean the screen printing on the chip is on upside down! Otherwise it might
be just a fleck of round dirt. I have to say I though the whole repair was
untidy and looking like it might fall to bits down the line some time. I now
routinely change the mask ROM holder when I get one in because all sorts of
nasties can get underneath without otherwise being spotted. 

 

Anyway, where were we. Yes, if the IC is polarised right the battery holder
arrangement might be causing a partial short. Any anyway, what IS that red
goo underneath, I wonder!?

 

Let us know Milan, if you are reading this!

 

Andy
Show quoted textHide quoted text
From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
Chromatest J. Pantsmaker
Sent: 18 March 2009 17:29
To: PolySix@yahoogroups.com
Subject: Re: [PolySix] Re: Having problems after battery replacement

 

After staring at it for a minute, it looks like the SRAM IC is in
correct to me. I can vaguely make out a "pin-one" notch at the end of
the IC towards the bottom of the picture.

On Wed, Mar 18, 2009 at 3:49 AM, Andrew Jury <andy@networkjabber.com
<mailto:andy%40networkjabber.com> > wrote:
> Hi Milan,

> One big observation is that it looks like the SRAM IC is in back to front!
> There is usually a dot marking pin 1 of the device. This seems to be where
> pin 10 is if you look carefully (this is the chip next to the orange
> connector). Could you take a mega close up picture of this device so we
can
> have a good look at it. It must admit if this was the case then the print
on
> top of the chip is upside down and the patch memory wouldn't work. But
that
> sure as hell looks like the pin 1 dot to me!!

-- 
.sig
-Chromatest J. Pantsmaker
http://www.chromatest.net





[Non-text portions of this message have been removed]

Re: Having problems after battery replacement

2009-03-18 by mekonin

Thank you for this quick response, guys.

I vaguely remember the technician mentioning this red goo being insulation, I'm 99% certain that that's the case.

Do you still want me to take those close-up pictures?

Oh, and about sending you the board, as much as I wish to, I sincerely doubt that it would be possible because I believe you're in the United States and I'm in Serbia.



--- In PolySix@yahoogroups.com, "Andrew Jury" <andy@...> wrote:
Show quoted textHide quoted text
>
> Ha! That's why I wanted a larger picture as I couldn't make it out. You have
> to admit it does look like the pin 1 dot at the wrong end, but this would
> mean the screen printing on the chip is on upside down! Otherwise it might
> be just a fleck of round dirt. I have to say I though the whole repair was
> untidy and looking like it might fall to bits down the line some time. I now
> routinely change the mask ROM holder when I get one in because all sorts of
> nasties can get underneath without otherwise being spotted. 
> 
>  
> 
> Anyway, where were we. Yes, if the IC is polarised right the battery holder
> arrangement might be causing a partial short. Any anyway, what IS that red
> goo underneath, I wonder!?
> 
>  
> 
> Let us know Milan, if you are reading this!
> 
>  
> 
> Andy
> 
>  
> 
> From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
> Chromatest J. Pantsmaker
> Sent: 18 March 2009 17:29
> To: PolySix@yahoogroups.com
> Subject: Re: [PolySix] Re: Having problems after battery replacement
> 
>  
> 
> After staring at it for a minute, it looks like the SRAM IC is in
> correct to me. I can vaguely make out a "pin-one" notch at the end of
> the IC towards the bottom of the picture.
> 
> On Wed, Mar 18, 2009 at 3:49 AM, Andrew Jury <andy@...
> <mailto:andy%40networkjabber.com> > wrote:
> > Hi Milan,
> 
> > One big observation is that it looks like the SRAM IC is in back to front!
> > There is usually a dot marking pin 1 of the device. This seems to be where
> > pin 10 is if you look carefully (this is the chip next to the orange
> > connector). Could you take a mega close up picture of this device so we
> can
> > have a good look at it. It must admit if this was the case then the print
> on
> > top of the chip is upside down and the patch memory wouldn't work. But
> that
> > sure as hell looks like the pin 1 dot to me!!
> 
> -- 
> .sig
> -Chromatest J. Pantsmaker
> http://www.chromatest.net
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>

RE: [PolySix] Re: Having problems after battery replacement

2009-03-19 by Andrew Jury

Milan,

 

Can you just verify for us the SRAM IC is located in it's socket correctly.
Pin 1 should match the dot printing on the board itself. See my private
message about having the board sent in for re-evaluation. I think you might
be OK. ;-)

 

Thanks,

Andy
Show quoted textHide quoted text
From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
mekonin
Sent: 18 March 2009 22:53
To: PolySix@yahoogroups.com
Subject: [PolySix] Re: Having problems after battery replacement

 

Thank you for this quick response, guys.

I vaguely remember the technician mentioning this red goo being insulation,
I'm 99% certain that that's the case.

Do you still want me to take those close-up pictures?

Oh, and about sending you the board, as much as I wish to, I sincerely doubt
that it would be possible because I believe you're in the United States and
I'm in Serbia.

--- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> , "Andrew
Jury" <andy@...> wrote:
>
> Ha! That's why I wanted a larger picture as I couldn't make it out. You
have
> to admit it does look like the pin 1 dot at the wrong end, but this would
> mean the screen printing on the chip is on upside down! Otherwise it might
> be just a fleck of round dirt. I have to say I though the whole repair was
> untidy and looking like it might fall to bits down the line some time. I
now
> routinely change the mask ROM holder when I get one in because all sorts
of
> nasties can get underneath without otherwise being spotted. 
> 
> 
> 
> Anyway, where were we. Yes, if the IC is polarised right the battery
holder
> arrangement might be causing a partial short. Any anyway, what IS that red
> goo underneath, I wonder!?
> 
> 
> 
> Let us know Milan, if you are reading this!
> 
> 
> 
> Andy
> 
> 
> 
> From: PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>
[mailto:PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> ] On
Behalf Of
> Chromatest J. Pantsmaker
> Sent: 18 March 2009 17:29
> To: PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> 
> Subject: Re: [PolySix] Re: Having problems after battery replacement
> 
> 
> 
> After staring at it for a minute, it looks like the SRAM IC is in
> correct to me. I can vaguely make out a "pin-one" notch at the end of
> the IC towards the bottom of the picture.
> 
> On Wed, Mar 18, 2009 at 3:49 AM, Andrew Jury <andy@...
> <mailto:andy%40networkjabber.com> > wrote:
> > Hi Milan,
> 
> > One big observation is that it looks like the SRAM IC is in back to
front!
> > There is usually a dot marking pin 1 of the device. This seems to be
where
> > pin 10 is if you look carefully (this is the chip next to the orange
> > connector). Could you take a mega close up picture of this device so we
> can
> > have a good look at it. It must admit if this was the case then the
print
> on
> > top of the chip is upside down and the patch memory wouldn't work. But
> that
> > sure as hell looks like the pin 1 dot to me!!
> 
> -- 
> .sig
> -Chromatest J. Pantsmaker
> http://www.chromatest.net
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>





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