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Post by starter on Feb 17, 2019 11:15:27 GMT
I have a quadraverb 2. If I place a new backup battery after 2 days it's 2.9V. and my memory is cleared. Has anybody a solution or a servicemanual.
Alesis Q2 main PCB 9-40-1128 REV. E
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Post by Charlie Hall on Feb 17, 2019 12:46:27 GMT
I have a Q2 service manual but I think it covers only REV A and C boards. You are welcome to email me for it charliehallATntlworld.com (replacing AT with @).
Regards,
Charlie
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Post by starter on Feb 17, 2019 18:55:43 GMT
Thanks for your response Charlie, but I have that manual too. But is is different from the Rev. E.
Regards,
Piet
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Post by Charlie Hall on Feb 17, 2019 21:13:19 GMT
Hi Piet,
I believe it is the only manual that was produced for the Q2.
I remember an IC located near to the battery circuit having to be replaced in one Q2 as it had caused the battery to discharge very quickly.
Regards,
Charlie
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Post by starter on Feb 18, 2019 8:42:18 GMT
Hi Charlie,
Thanks for your effort, I try if I can find it,
Regards,
Piet
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Post by brightcaster on Feb 19, 2019 16:24:02 GMT
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Post by grip on Feb 19, 2019 17:07:37 GMT
Hi Piet, Thw manual at the link below is version II of the Quadraverb 2 manual, and it makes reference to the rev e mainboard in the parts list on page G4 toward the end of the manual. Therefore, I think this must cover rev e also. app.box.com/s/qudsvbhzhqh2idspq6tmgjrj7ik1os8yKind regards, Chris |
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Post by starter on Mar 10, 2019 8:38:04 GMT
Hi David, Unfortunately, the manual you gave is not the similar with the E-rev.
Chris, your Manual is the rev-C
Thanks both of you for your help.
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Post by grip on Mar 10, 2019 13:28:58 GMT
Hi Starter,
Sometimes it pays to read everything, read my post:
"and it makes reference to the rev e mainboard in the parts list on page G4 toward the end of the manual. Therefore, I think this must cover rev e also."....
and then look at the manual:
"11/29/95 V2.00 Page 1 Specified REV. C PCBs as type referenced in text.
Appendix 1 Added several updates.
Appendix 5 Added V2.00 and 2.01 to software history.
Appendix 6 Added Chapter 11.20 V2.0X [Sys-Ex].
Appendix 8 Added column headings to all BOM pages.
Appendix X (Schematics) moved to end of manual to accommodate
the use of the larger 11X17 size. Consequently most appendix #s and
appendix page #s have changed.
Added REV. E to schematics and BOM sections.
Updated Table of Contents."
Alesis QuadraVerb II 2.00 F-1 7/19/06
Kind regards,
Chris
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Post by brightcaster on Mar 10, 2019 15:50:17 GMT
A different aproach:
As long as the 100kOhm Resistor which is placed serial to the battery works, it is allmost impossible to drop the battery charge that strong that it goes down to 2.9V within two days!
The original BR2325 Lithium-battery which was used by alesis has a capacity of 165mAh. If you shorten the battery with the serial 100kOhm resistor you drain 30 µA only! It would need 5500 hours or 230 days to empty it completely!!
So it looks as if there must be something wrong with your batteries!
Are they really new? NOS batteries don't work very long ;-)
David
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Post by Charlie Hall on Mar 10, 2019 16:48:50 GMT
I always thought the series resistor was 10K.
Regards,
Charlie
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Post by brightcaster on Mar 10, 2019 17:03:16 GMT
According to the manual it should be 10k on the Q20 but 100k on the Q2, which also looks weird to me. Nevertheless even with 10k it should keep the voltage for more than 2 days...
David
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Post by starter on Mar 17, 2019 11:45:38 GMT
I am going to order the BR2325. I used the CR2325 this would have a capacity of 190mAh.
I have measured the resistance and this is 10k, the diodes are good. I am going to order the right battery again.
I hope that is the solution for my problem, thanks all for helping me.
I will inform you about the result.
Piet
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Post by Charlie Hall on Mar 17, 2019 15:06:33 GMT
I will be interested to know if you can still get the BR2325, because I understood that all BR lithium types were obsolete.
The CR2430 with higher capacity would be a better option than a CR2325, but you would have to improvise a little with the solder connections as the pin spacings are different.
Regards,
Charlie
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Post by brightcaster on Mar 17, 2019 16:58:15 GMT
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Post by Charlie Hall on Mar 17, 2019 17:09:18 GMT
OK, that's good. Are you going for the plain coin cell to use with a battery holder?
Regards,
Charlie
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Post by grip on Mar 17, 2019 20:00:05 GMT
OK, that's good. Are you going for the plain coin cell to use with a battery holder? Regards, Charlie Hi Piet & Charlie I replaced the batteries in mine to a battery holder used CR2032's in it and all 3 run just fine still. Kind regards, Chris |
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Post by starter on Apr 1, 2019 7:52:47 GMT
I received the the BR2325 and 2 hours after replacing the voltage was 2.7V and all user presets are lost
So I think something else must be wrong.
I checked the diodes end resisters 10k and 4k7 (for rev E), they are oke.
Has anybody suggestions?
Kind regards,
Piet
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Post by Charlie Hall on Apr 1, 2019 9:37:31 GMT
Hi Piet,
I am thinking there must be a short circuit somewhere on the board. With the battery removed, check for a short between the + and - connections.
Regards,
Charlie
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Post by starter on Apr 4, 2019 13:04:18 GMT
I did remove the battery and messured, but there wasn't a short between it. The voltage regulator gave out 3.6 V. I replaced it, after it the voltage was Oke 5V.
But it didn't solve the problem.
I don't know what I can do now.
Thanks for helping me.
Regards,
Piet
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Post by starter on Apr 28, 2019 10:04:07 GMT
Problem solved. I did replace two capacitors C12 and C32 0.1 microF
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Post by brightcaster on Apr 29, 2019 6:37:38 GMT
Congratulations to solve this issue! Yes, that really makes sense. Looks like the batteries are not completely depleted, but the short-circuit capacitor has lowered the voltage beyond the 10K resistor only. As soon as it drops below the threshold of the static ram the memory will be lost, even if the batteries are still charged to work for years under normal conditions.
Thank you for sharing your experience!
Regards, David
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