|
Hi everyone! Unfortunately I’m writing here because my Xpander has some problem. Every test on voice 6 fails. VCO, PW, RES, VCF and VCA. So I suppose it’s not a CEM problem because it would fail only 1-2 test, or a power supply problem, because in this case it would affect all the voices.
I’ve swapped some IC, but the problems remain on the same voice. Please could you tell me and confirm me the the first one on the left is the voice 6 and the last one on the right the voice 1?
Thank you very much,
Stefano
|
Hello Stefano, The good news is, it’s probably just a capacitor, the bad news is you must unsolder and replace a component on the voice circuit board. If you don’t feel comfortable soldering on a circuit board you might want to find an experienced tech. ? The following notes are in reference to the Xpander Service Manual available on the Xpantastic forum. ? The most common part to fail /replace is Cx49.? This fail happens so often I have written a small service note for it. ? It is a 2.2 uF ?25V electrolytic capacitor. The schematic is on page 27 of the Xpander Service Manual. ? Your looking for part number Cx49 ? There is one each of these parts for each voice ? the x in the designation will be one of a 2 - 7 number. However, The numbers are not the same as the voice number.? ? ??????????? Voice 6 = C249 *?? Replace this one ??????????? Voice 5 = C349????????? ??????????? Voice 4 = C449????????? ??????????? Voice 3 = C549 ??????????? Voice 2 = C649 ???????? ??????????? Voice 1 = C749 ? Note that each part in that voice will have the same prefix ex.?? C2xx? or U2xx for voice 6 ? ? Parts Placement Drawing = Page 77 and 78 ? ? Notice the parts for each voice are located in a strip which runs verticle down the circuit board.? ? Look to the bottom lefthand corner of the circuit board. ? Inside the Voice circuit notice an 8 pin chip with a designation of Ux16 The capacitor is located right next to the bottom lefthand corner of this chip. ? You can recognize them as a small electrolytic capacitor. The part designation is printed right next to it. ? Polarity must be observed. but you probobly knew that. ? Best Luck ? ? ? ? Sent from for Windows 10 ?
toggle quoted message
Show quoted text
From: Stefano via Groups.IoSent: Sunday, December 22, 2019 9:04 AM To: [email protected]Subject: [xpantastic] Tuning fail ? Hi everyone! Unfortunately I’m writing here because my Xpander has some problem. Every test on voice 6 fails. VCO, PW, RES, VCF and VCA. So I suppose it’s not a CEM problem because it would fail only 1-2 test, or a power supply problem, because in this case it would affect all the voices. I’ve swapped some IC, but the problems remain on the same voice. Please could you tell me and confirm me the the first one on the left is the voice 6 and the last one on the right the voice 1? ? Thank you very much, Stefano ? ? ?
|
Hello Karl! Thank you for your kind reply and you detailed description. My Xpander was never serviced so I think that the problem could be a capacitor.? I’m quite expert in soldering, so I can proceed by myself.? Only a question: the 2,2 uf capacitor has a 50 voltage, not 25. But I think we are talking about the same component.? I think I will replace this capacitor in the Xmas Holidays.?
Best regards,? Stefano
toggle quoted message
Show quoted text
Il giorno 22 dic 2019, alle ore 17:31, Karl Schmeer <shire03@...> ha scritto:
? Hello Stefano, The good news is, it’s probably just a capacitor, the bad news is you must unsolder and replace a component on the voice circuit board. If you don’t feel comfortable soldering on a circuit board you might want to find an experienced tech. ? The following notes are in reference to the Xpander Service Manual available on the Xpantastic forum. ? The most common part to fail /replace is Cx49.? This fail happens so often I have written a small service note for it. ? It is a 2.2 uF ?25V electrolytic capacitor. The schematic is on page 27 of the Xpander Service Manual. ? Your looking for part number Cx49 ? There is one each of these parts for each voice ? the x in the designation will be one of a 2 - 7 number. However, The numbers are not the same as the voice number.? ? ??????????? Voice 6 = C249 *?? Replace this one ??????????? Voice 5 = C349????????? ??????????? Voice 4 = C449????????? ??????????? Voice 3 = C549 ??????????? Voice 2 = C649 ???????? ??????????? Voice 1 = C749 ? Note that each part in that voice will have the same prefix ex.?? C2xx? or U2xx for voice 6 ? ? Parts Placement Drawing = Page 77 and 78 ? ? Notice the parts for each voice are located in a strip which runs verticle down the circuit board.? ? Look to the bottom lefthand corner of the circuit board. ? Inside the Voice circuit notice an 8 pin chip with a designation of Ux16 The capacitor is located right next to the bottom lefthand corner of this chip. ? You can recognize them as a small electrolytic capacitor. The part designation is printed right next to it. ? Polarity must be observed. but you probobly knew that. ? Best Luck ? ? ? ? Sent from for Windows 10 ? ? Hi everyone! Unfortunately I’m writing here because my Xpander has some problem. Every test on voice 6 fails. VCO, PW, RES, VCF and VCA. So I suppose it’s not a CEM problem because it would fail only 1-2 test, or a power supply problem, because in this case it would affect all the voices. I’ve swapped some IC, but the problems remain on the same voice. Please could you tell me and confirm me the the first one on the left is the voice 6 and the last one on the right the voice 1? ? Thank you very much, Stefano ? ? ?
|
Hi Stefano, Yes your right, I could not remember the voltage rating and looked it up in the service manual. It is listed there as 25V But actual production values are 50V Which is fine. A 50 Volt will last longer and does not change the frequency response. ( All the signal from the voice goes through this cap to be mixed before final output.) Have a great holiday!! ? Sent from for Windows 10 ?
toggle quoted message
Show quoted text
From: Stefano via Groups.IoSent: Monday, December 23, 2019 8:17 AM To: [email protected]Subject: Re: [xpantastic] Tuning fail ? Hello Karl! Thank you for your kind reply and you detailed description. My Xpander was never serviced so I think that the problem could be a capacitor.? I’m quite expert in soldering, so I can proceed by myself.? Only a question: the 2,2 uf capacitor has a 50 voltage, not 25. But I think we are talking about the same component.? I think I will replace this capacitor in the Xmas Holidays.? Il giorno 22 dic 2019, alle ore 17:31, Karl Schmeer <shire03@...> ha scritto:
? Hello Stefano, The good news is, it’s probably just a capacitor, the bad news is you must unsolder and replace a component on the voice circuit board. If you don’t feel comfortable soldering on a circuit board you might want to find an experienced tech. ? The following notes are in reference to the Xpander Service Manual available on the Xpantastic forum. ? The most common part to fail /replace is Cx49.? This fail happens so often I have written a small service note for it. ? It is a 2.2 uF ?25V electrolytic capacitor. The schematic is on page 27 of the Xpander Service Manual. ? Your looking for part number Cx49 ? There is one each of these parts for each voice ? the x in the designation will be one of a 2 - 7 number. However, The numbers are not the same as the voice number.? ? ??????????? Voice 6 = C249 *?? Replace this one ??????????? Voice 5 = C349????????? ??????????? Voice 4 = C449????????? ??????????? Voice 3 = C549 ??????????? Voice 2 = C649 ???????? ??????????? Voice 1 = C749 ? Note that each part in that voice will have the same prefix ex.?? C2xx? or U2xx for voice 6 ? ? Parts Placement Drawing = Page 77 and 78 ? ? Notice the parts for each voice are located in a strip which runs verticle down the circuit board.? ? Look to the bottom lefthand corner of the circuit board. ? Inside the Voice circuit notice an 8 pin chip with a designation of Ux16 The capacitor is located right next to the bottom lefthand corner of this chip. ? You can recognize them as a small electrolytic capacitor. The part designation is printed right next to it. ? Polarity must be observed. but you probobly knew that. ? Best Luck ? ? ? ? Sent from for Windows 10 ? ? Hi everyone! Unfortunately I’m writing here because my Xpander has some problem. Every test on voice 6 fails. VCO, PW, RES, VCF and VCA. So I suppose it’s not a CEM problem because it would fail only 1-2 test, or a power supply problem, because in this case it would affect all the voices. I’ve swapped some IC, but the problems remain on the same voice. Please could you tell me and confirm me the the first one on the left is the voice 6 and the last one on the right the voice 1? ? Thank you very much, Stefano ? ? ?
|
Hi Karl,?
I’ve finally replaced the C249, unfortunately the problem is still present. Every test on voice 6 fails. The FAIL label appear just after my Xpander start to test this voice, for each section (VCO, PW, ecc). I think it’s a problem in the first part of the voice path. Maybe a multiplexer, or the cap on the top of the PCB or a missing tension on that voice strip... I will try the latest test, then I will bring my Xpander to an experienced tech. Thank you! Stefano?
toggle quoted message
Show quoted text
Il giorno 24 dic 2019, alle ore 06:58, Karl Schmeer <shire03@...> ha scritto:
? Hi Stefano, Yes your right, I could not remember the voltage rating and looked it up in the service manual. It is listed there as 25V But actual production values are 50V Which is fine. A 50 Volt will last longer and does not change the frequency response. ( All the signal from the voice goes through this cap to be mixed before final output.) Have a great holiday!! ? Sent from for Windows 10 ? ? Hello Karl! Thank you for your kind reply and you detailed description. My Xpander was never serviced so I think that the problem could be a capacitor.? I’m quite expert in soldering, so I can proceed by myself.? Only a question: the 2,2 uf capacitor has a 50 voltage, not 25. But I think we are talking about the same component.? I think I will replace this capacitor in the Xmas Holidays.? Il giorno 22 dic 2019, alle ore 17:31, Karl Schmeer <shire03@...> ha scritto:
? Hello Stefano, The good news is, it’s probably just a capacitor, the bad news is you must unsolder and replace a component on the voice circuit board. If you don’t feel comfortable soldering on a circuit board you might want to find an experienced tech. ? The following notes are in reference to the Xpander Service Manual available on the Xpantastic forum. ? The most common part to fail /replace is Cx49.? This fail happens so often I have written a small service note for it. ? It is a 2.2 uF ?25V electrolytic capacitor. The schematic is on page 27 of the Xpander Service Manual. ? Your looking for part number Cx49 ? There is one each of these parts for each voice ? the x in the designation will be one of a 2 - 7 number. However, The numbers are not the same as the voice number.? ? ??????????? Voice 6 = C249 *?? Replace this one ??????????? Voice 5 = C349????????? ??????????? Voice 4 = C449????????? ??????????? Voice 3 = C549 ??????????? Voice 2 = C649 ???????? ??????????? Voice 1 = C749 ? Note that each part in that voice will have the same prefix ex.?? C2xx? or U2xx for voice 6 ? ? Parts Placement Drawing = Page 77 and 78 ? ? Notice the parts for each voice are located in a strip which runs verticle down the circuit board.? ? Look to the bottom lefthand corner of the circuit board. ? Inside the Voice circuit notice an 8 pin chip with a designation of Ux16 The capacitor is located right next to the bottom lefthand corner of this chip. ? You can recognize them as a small electrolytic capacitor. The part designation is printed right next to it. ? Polarity must be observed. but you probobly knew that. ? Best Luck ? ? ? ? Sent from for Windows 10 ? ? Hi everyone! Unfortunately I’m writing here because my Xpander has some problem. Every test on voice 6 fails. VCO, PW, RES, VCF and VCA. So I suppose it’s not a CEM problem because it would fail only 1-2 test, or a power supply problem, because in this case it would affect all the voices. I’ve swapped some IC, but the problems remain on the same voice. Please could you tell me and confirm me the the first one on the left is the voice 6 and the last one on the right the voice 1? ? Thank you very much, Stefano ? ? ?
<7A0E8B4E42FF41C68656ED01468BD175.png>
|
Hello Stefano, Sorry that did not fix it. If you could lay your hands on a voltmeter I would check the power supply voltages in the voice with problems. You could have a bypass capacitor in that circuit which is dragging down the power supply.? Be very careful not to short against any nearby pins. I am concentrating on the electrolytic capacitors because given the +30 year age of these synths they are the most likely to fail. Caution : There are additional polypropylene caps in each voice circuit which should not be replaced as they last forever and are near impossible to find. You could just replace all the electrolytic capacitors in the failing circuit. The tech will probably recommend an entire re-capping of the voice board. ?This would not be a bad idea but is expensive for the whole voice board. If that does not fix it, the most likely suspect would be the many analog switch chips in the voice circuit.? To really narrow it down an oscilloscope would be very useful. If you want to continue working on it ( not many techs will work on these anymore) I will be glad to help. Best Regards Karl ? Sent from for Windows 10 ?
toggle quoted message
Show quoted text
From: Stefano via Groups.IoSent: Saturday, January 11, 2020 6:47 AM To: [email protected]Subject: Re: [xpantastic] Tuning fail ? Hi Karl,? I’ve finally replaced the C249, unfortunately the problem is still present. Every test on voice 6 fails. The FAIL label appear just after my Xpander start to test this voice, for each section (VCO, PW, ecc). I think it’s a problem in the first part of the voice path. Maybe a multiplexer, or the cap on the top of the PCB or a missing tension on that voice strip... I will try the latest test, then I will bring my Xpander to an experienced tech.
Il giorno 24 dic 2019, alle ore 06:58, Karl Schmeer <shire03@...> ha scritto:
? Hi Stefano, Yes your right, I could not remember the voltage rating and looked it up in the service manual. It is listed there as 25V But actual production values are 50V Which is fine. A 50 Volt will last longer and does not change the frequency response. ( All the signal from the voice goes through this cap to be mixed before final output.) Have a great holiday!! ? Sent from for Windows 10 ? ? Hello Karl! Thank you for your kind reply and you detailed description. My Xpander was never serviced so I think that the problem could be a capacitor.? I’m quite expert in soldering, so I can proceed by myself.? Only a question: the 2,2 uf capacitor has a 50 voltage, not 25. But I think we are talking about the same component.? I think I will replace this capacitor in the Xmas Holidays.? Il giorno 22 dic 2019, alle ore 17:31, Karl Schmeer <shire03@...> ha scritto:
? Hello Stefano, The good news is, it’s probably just a capacitor, the bad news is you must unsolder and replace a component on the voice circuit board. If you don’t feel comfortable soldering on a circuit board you might want to find an experienced tech. ? The following notes are in reference to the Xpander Service Manual available on the Xpantastic forum. ? The most common part to fail /replace is Cx49.? This fail happens so often I have written a small service note for it. ? It is a 2.2 uF ?25V electrolytic capacitor. The schematic is on page 27 of the Xpander Service Manual. ? Your looking for part number Cx49 ? There is one each of these parts for each voice ? the x in the designation will be one of a 2 - 7 number. However, The numbers are not the same as the voice number.? ? ??????????? Voice 6 = C249 *?? Replace this one ??????????? Voice 5 = C349????????? ??????????? Voice 4 = C449????????? ??????????? Voice 3 = C549 ??????????? Voice 2 = C649 ???????? ??????????? Voice 1 = C749 ? Note that each part in that voice will have the same prefix ex.?? C2xx? or U2xx for voice 6 ? ? Parts Placement Drawing = Page 77 and 78 ? ? Notice the parts for each voice are located in a strip which runs verticle down the circuit board.? ? Look to the bottom lefthand corner of the circuit board. ? Inside the Voice circuit notice an 8 pin chip with a designation of Ux16 The capacitor is located right next to the bottom lefthand corner of this chip. ? You can recognize them as a small electrolytic capacitor. The part designation is printed right next to it. ? Polarity must be observed. but you probobly knew that. ? Best Luck ? ? ? ? Sent from for Windows 10 ? ? Hi everyone! Unfortunately I’m writing here because my Xpander has some problem. Every test on voice 6 fails. VCO, PW, RES, VCF and VCA. So I suppose it’s not a CEM problem because it would fail only 1-2 test, or a power supply problem, because in this case it would affect all the voices. I’ve swapped some IC, but the problems remain on the same voice. Please could you tell me and confirm me the the first one on the left is the voice 6 and the last one on the right the voice 1? ? Thank you very much, Stefano ? ? ?
<7A0E8B4E42FF41C68656ED01468BD175.png>
|
Hi Karl and Stefano !
I had similar s##t w/ a voice, thought it would be the CEM 3372 or
3374 or an electrolytic cap,- and at the end it was a cheapo opamp
(TL 074 or similar IIRC while typing from my head here).
I was surprised because thesympthoms were tuning failure and no
sound.
PeWe
Am 11.01.2020 um 15:22 schrieb Karl Schmeer:
toggle quoted message
Show quoted text
Hello Stefano,
Sorry that did not fix it. If you could lay
your hands on a voltmeter I would check the power supply
voltages in the voice with problems. You could have a bypass
capacitor in that circuit which is dragging down the power
supply.? Be very careful not to short against any nearby pins.
I am concentrating on the electrolytic
capacitors because given the +30 year age of these synths they
are the most likely to fail. Caution : There are additional
polypropylene caps in each voice circuit which should not be
replaced as they last forever and are near impossible to find.
You could just replace all the electrolytic
capacitors in the failing circuit. The tech will probably
recommend an entire re-capping of the voice board. ?This would
not be a bad idea but is expensive for the whole voice board.
If that does not fix it, the most likely
suspect would be the many analog switch chips in the voice
circuit.? To really narrow it down an oscilloscope would be
very useful.
If you want to continue working on it ( not
many techs will work on these anymore) I will be glad to help.
Best Regards
Karl
?
Sent from for Windows 10
?
?
Hi Karl,?
I’ve finally
replaced the C249, unfortunately the problem is still
present. Every test on voice 6 fails. The FAIL label appear
just after my Xpander start to test this voice, for each
section (VCO, PW, ecc). I think it’s a problem in the first
part of the voice path. Maybe a multiplexer, or the cap on
the top of the PCB or a missing tension on that voice
strip... I will try the latest test, then I will bring my
Xpander to an experienced tech.
Il
giorno 24 dic 2019, alle ore 06:58, Karl Schmeer
<shire03@...> ha scritto:
?
Hi Stefano,
Yes your right, I could not remember
the voltage rating and looked it up in the service
manual. It is listed there as 25V
But actual production values are 50V
Which is fine. A 50 Volt will last longer and does not
change the frequency
response. ( All the signal from the
voice goes through this cap to be mixed before final
output.)
Have a great holiday!!
?
Sent from for Windows 10
?
?
Hello Karl! Thank you for your kind
reply and you detailed description. My Xpander was never
serviced so I think that the problem could be a
capacitor.?
I’m quite expert in soldering, so I
can proceed by myself.?
Only a question: the 2,2 uf
capacitor has a 50 voltage, not 25. But I think we
are talking about the same component.?
I think I will replace this
capacitor in the Xmas Holidays.?
Il
giorno 22 dic 2019, alle ore 17:31, Karl Schmeer
<shire03@...> ha scritto:
?
Hello Stefano,
The good news is, it’s probably
just a capacitor, the bad news is you must
unsolder and replace a component on the voice
circuit board. If you don’t feel comfortable
soldering on a circuit board you might want to
find an experienced tech.
?
The following notes are in
reference to the Xpander Service Manual available
on the Xpantastic
forum.
?
The most common part to fail
/replace is Cx49.? This fail happens so often I
have written a small service note for it.
?
It is a 2.2 uF ?25V
electrolytic capacitor.
The schematic is on page 27 of
the Xpander Service Manual.
?
Your looking for part number
Cx49
?
There is one each of these
parts for each voice
?
the x in the designation will
be one of a 2 - 7 number. However, The numbers are
not
the same as the voice number.?
?
??????????? Voice 6 = C249
*?? Replace this one
??????????? Voice 5 =
C349?????????
??????????? Voice 4 =
C449?????????
??????????? Voice 3 = C549
??????????? Voice 2 = C649
????????
??????????? Voice 1 = C749
?
Note that each part in that
voice will have the same prefix ex.?? C2xx? or
U2xx for voice 6
?
?
Parts Placement Drawing = Page
77 and 78
?
?
Notice the parts for each voice
are located in a strip which runs verticle down
the circuit board.?
?
Look to the bottom lefthand
corner of the circuit board.
?
Inside the Voice circuit notice
an 8 pin chip with a designation of Ux16
The capacitor is located right
next to the bottom lefthand corner of this chip.
?
You can recognize them as a
small electrolytic capacitor. The part designation
is printed right next to it.
?
Polarity must be observed. but
you probobly knew that.
?
Best Luck
?
?
?
?
Sent from for Windows 10
?
?
Hi everyone! Unfortunately I’m
writing here because my Xpander has some problem.
Every test on voice 6 fails. VCO, PW, RES, VCF and
VCA. So I suppose it’s not a CEM problem because
it would fail only 1-2 test, or a power supply
problem, because in this case it would affect all
the voices.
I’ve swapped some IC, but the
problems remain on the same voice. Please could
you tell me and confirm me the the first one on
the left is the voice 6 and the last one on the
right the voice 1?
?
Thank you very much,
Stefano
?
?
?
<7A0E8B4E42FF41C68656ED01468BD175.png>
|
Hi, here's my 5 cents:
-sorry, but full recapping is bullshit vodoo for people with too much money or time. Blind actionism can not compensate for a lack of expertise.
- in my long term experience in music electronics, I have seen many PS and even PP capacitors fail. Even Resistors and Ceramic disc capacitors fail in U.S. made electronics (I ve seen e.g. in Oberheim OB-Xa, XPander, Matrix 6 Nd 12). Dont blame Electrolytics for everything. The general Electrolytics bashing originates from late 1990iies China made computer PSRs.
In fact, the PS capacitors in the SH section may fail in the XPander/Matrix12 voiceboards resulting in unstable VCO or VCF tuning.
But, yes, you do not want to replace them just for the fun of it, because they are difficult to find and utmost sensitive to heat. If you are to replace them, consider to use modern type capacitors, which are not PS types. Modern type capacitors outperform PS types in most instances, particularly in a SH circuit for CVs.
Best,
Mondo
-
|
Mine tunes when I disconnect the earth/ground wire at the power socket.
toggle quoted message
Show quoted text
On 11 Jan 2020, at 17:47, Karl Schmeer <shire03@...> wrote:
? Hello Stefano, Sorry that did not fix it. If you could lay your hands on a voltmeter I would check the power supply voltages in the voice with problems. You could have a bypass capacitor in that circuit which is dragging down the power supply.? Be very careful not to short against any nearby pins. I am concentrating on the electrolytic capacitors because given the +30 year age of these synths they are the most likely to fail. Caution : There are additional polypropylene caps in each voice circuit which should not be replaced as they last forever and are near impossible to find. You could just replace all the electrolytic capacitors in the failing circuit. The tech will probably recommend an entire re-capping of the voice board. ?This would not be a bad idea but is expensive for the whole voice board. If that does not fix it, the most likely suspect would be the many analog switch chips in the voice circuit.? To really narrow it down an oscilloscope would be very useful. If you want to continue working on it ( not many techs will work on these anymore) I will be glad to help. Best Regards Karl ? Sent from for Windows 10 ? ? Hi Karl,? I’ve finally replaced the C249, unfortunately the problem is still present. Every test on voice 6 fails. The FAIL label appear just after my Xpander start to test this voice, for each section (VCO, PW, ecc). I think it’s a problem in the first part of the voice path. Maybe a multiplexer, or the cap on the top of the PCB or a missing tension on that voice strip... I will try the latest test, then I will bring my Xpander to an experienced tech.
Il giorno 24 dic 2019, alle ore 06:58, Karl Schmeer <shire03@...> ha scritto:
? Hi Stefano, Yes your right, I could not remember the voltage rating and looked it up in the service manual. It is listed there as 25V But actual production values are 50V Which is fine. A 50 Volt will last longer and does not change the frequency response. ( All the signal from the voice goes through this cap to be mixed before final output.) Have a great holiday!! ? Sent from for Windows 10 ? ? Hello Karl! Thank you for your kind reply and you detailed description. My Xpander was never serviced so I think that the problem could be a capacitor.? I’m quite expert in soldering, so I can proceed by myself.? Only a question: the 2,2 uf capacitor has a 50 voltage, not 25. But I think we are talking about the same component.? I think I will replace this capacitor in the Xmas Holidays.? Il giorno 22 dic 2019, alle ore 17:31, Karl Schmeer <shire03@...> ha scritto:
? Hello Stefano, The good news is, it’s probably just a capacitor, the bad news is you must unsolder and replace a component on the voice circuit board. If you don’t feel comfortable soldering on a circuit board you might want to find an experienced tech. ? The following notes are in reference to the Xpander Service Manual available on the Xpantastic forum. ? The most common part to fail /replace is Cx49.? This fail happens so often I have written a small service note for it. ? It is a 2.2 uF ?25V electrolytic capacitor. The schematic is on page 27 of the Xpander Service Manual. ? Your looking for part number Cx49 ? There is one each of these parts for each voice ? the x in the designation will be one of a 2 - 7 number. However, The numbers are not the same as the voice number.? ? ??????????? Voice 6 = C249 *?? Replace this one ??????????? Voice 5 = C349????????? ??????????? Voice 4 = C449????????? ??????????? Voice 3 = C549 ??????????? Voice 2 = C649 ???????? ??????????? Voice 1 = C749 ? Note that each part in that voice will have the same prefix ex.?? C2xx? or U2xx for voice 6 ? ? Parts Placement Drawing = Page 77 and 78 ? ? Notice the parts for each voice are located in a strip which runs verticle down the circuit board.? ? Look to the bottom lefthand corner of the circuit board. ? Inside the Voice circuit notice an 8 pin chip with a designation of Ux16 The capacitor is located right next to the bottom lefthand corner of this chip. ? You can recognize them as a small electrolytic capacitor. The part designation is printed right next to it. ? Polarity must be observed. but you probobly knew that. ? Best Luck ? ? ? ? Sent from for Windows 10 ? ? Hi everyone! Unfortunately I’m writing here because my Xpander has some problem. Every test on voice 6 fails. VCO, PW, RES, VCF and VCA. So I suppose it’s not a CEM problem because it would fail only 1-2 test, or a power supply problem, because in this case it would affect all the voices. I’ve swapped some IC, but the problems remain on the same voice. Please could you tell me and confirm me the the first one on the left is the voice 6 and the last one on the right the voice 1? ? Thank you very much, Stefano ? ? ?
<7A0E8B4E42FF41C68656ED01468BD175.png>
<A7867C3AEE0B42CCA97D240190A70FBA.png>
|
Mondovermona