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happyplucker
Bronze Member
United Kingdom
126 Posts |
 Posted - 03/13/2008 : 14:29:29
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your a gentleman dr bob, ive sent you a PM  |
Edited by - happyplucker on 03/13/2008 14:43:21 |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 03/13/2008 : 22:23:39
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Check if there is any major difference in the weight with or without the case. According to the manual its only 400g or 14oz dry.
Don't ship it with a battery, for some funny reason postal workers don't think its funny 
I'd trust the Dr. with my CE-2, all the way from Ottawa,Canada
Heck, all my pedals if it came down to it...
Was thinking of suggesting to send it to someone in the forum, but you live in the UK.
Good luck, the CE-2 will live again |
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happyplucker
Bronze Member
United Kingdom
126 Posts |
Posted - 03/14/2008 : 10:35:03
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| yeah, i have faith in the doc! |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 03/14/2008 : 12:26:13
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quote:
Originally posted by happyplucker
your a gentleman dr bob, ive sent you a PM
Hi happyplucker
I didn't get any mail from you.
I've sent you an mail via the forum's email link.
So you should now have my direct email address.
Please take some internal pictures of it, before & as you dismantile
it from the metal housing.
These will be for your reference, for when you reassemble it.
Regards Dr. Bob.
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 03/14/2008 : 13:58:04
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Hey happyplucker - I sent you a PM a couple of days ago too and haven't heard back. Is your email futzed up?
Laurie. |
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happyplucker
Bronze Member
United Kingdom
126 Posts |
Posted - 03/14/2008 : 14:32:58
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man!
what about all those ladies that might have been emailing me!
right it looks like i cant send or recieve PM's for some reason. (tis making me look like a right dumbass)
sorry to you both for not replying, send us another email to that address, as i havent recieved any PM's or mails cheers guys
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Edited by - happyplucker on 03/14/2008 15:18:49 |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 03/14/2008 : 14:56:33
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Hi happyplucker
Check your PM in that new account-address you just posted above.
I sent it, a few minutes ago.
Regards Dr. Bob |
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RonNovy
Copper Member
USA
24 Posts |
Posted - 03/15/2008 : 13:38:57
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Hey... Sorry I took so long getting back... I see your still having trouble... If you still have the pedal I've got some more tests you could try... I'll just post em since I've got time...
Over the past few days I had some free time and thought you should know I created a simulation of the circuit from the schematic and tried various things to try and re-create the problems you described... My conclusion is that it must be the MN3101 or MN3007. I'm about 98% sure it's MN3101 or MN3007 and the other 2% that its a bad cap (C22 circled in red in the pic below) or transistor. My main theory is that the cap I previously circled in red and told you to replace went bad and caused a short thus shorting out the MN3101 chip that provides the Vgg supply to the MN3007. That cap should be rated for at least twice the pedal voltage. Then again if C22 (the other 2% worth mentioning) has failed it could cause the MN3101 to oscillate too slow or too quickly for the MN3007, it is unlikely, but check C22 (47pF) anyway. I forgot to bring some of my fancy test circuits and new photo mods, but I made a quick mod here...
Testing C22 (the cap circled in red)... To test a cap just remove it and test for continuity. There should be no connection, no beep, and high resistance (only that from your fingers) between the two leads on the cap. If there is continuity then the cap is bad and needs to be replaced. Note that some caps can be tested on the circuit board, but to be 100% sure you need to remove it from the circuit board. It all depends on the way the cap is being used in the circuit and is too complicated to explain here.
Testing the MN3101 is really simple. Set your volt meter to DC volts. It's usually the red V with a symbol that looks like an equal sign except the bottom line is dotted. If there is a range setting then you want something in the range of about 18 to 50 volts which is higher then twice the pedal voltage (9v x 2 = 18v etc.) If your meter is digital it most likely sets this automatically.
Note the data on the MN3101 looks a little confusing to me... Maybe someone with a working CE-2 can confirm this next test? 
Ok now that the meter is setup, take the black test probe and touch it to the pin on the MN3101 I circled in black. Then take the red probe and touch it to the pin I circled in blue. You should get a reading of about 9 volts or whatever voltage you put into the pedal. Now leave the black probe there and touch the red probe to the pin on the MN3101 that I circled in yellow. You should get a reading of about 14 volts (I think). Or it may be 9 or -9 volts I'm not sure... If anyone knows for sure please post, I'd like to know...
There are other tests that can be done but I'm a bit worn out at the moment... If you'd like more help just let me know... 
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Edited by - RonNovy on 03/15/2008 13:46:47 |
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happyplucker
Bronze Member
United Kingdom
126 Posts |
Posted - 03/17/2008 : 10:04:44
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| cheers for that RonNovy, i may get chance to do it. it all depends on time scale andwhich ever comes first. but your help has been really good. thanks for taking the time to write such detailed stuff for me! ( and everyone else) |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 04/28/2008 : 13:46:40
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Hi HappyPlucker & Guys
A postscript to the the story.
I asked HappyPlucker for permission to tell you guys about the repair.
The CE-2 arrived here safely & in pretty good condition,
except the 100K Rate pot was damaged.
Nothing a pot replacement wont fix, it might have been at the bottom of a pile of other mail on its trip to Oz.
Ok now for the Happy Ending, well at least while it's here in the lab.
Back on page 3, of this thread I wrote.
"I'm guessing that we have all missed something really obvious."
Well I was right, we all missed the trees for the forest, or however that old saying goes..
When HappyPlucker did the mod, he inadvertently put the 8 pin IC socket in backwards, but must have inserted the op-amp in it's correct orientation, as it worked for 18 month or so.
Only when the op-amp failed for some reason, & HappyPlucker went to replace it, he must have looked at the socket & put the op-amp in according to the orientation of the incorrectly fitted socket.
And we all missed it, in the pictures, he posted.
It caught me off guard for a while as well.
Here is an edited pic of the op-amp the wrong way around, from his first pic on page 1.
Readers Digest Version:
IC socket, & replacement IC was inserted backwards.
At present I replaced the OPA2134, with a NOS JRC4558, as I don't have the OPA' op-amps.
Little feller sings pretty good, & is having a great time with his six Aussie Cousins,
while the waiting for his new Rate pot.
Thanks to EVERYONE who pitched in & helped,
that's one of the greatest things about Bossarea Forum, the "Community Spirit"
Regards Dr. Bob
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Edited by - Dr. Bob on 04/28/2008 13:58:29 |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 04/28/2008 : 14:17:05
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| Well well, usually something simple, eh? It's just not that simple to find it sometimes! Congrats Dr. Bob on the fix and Happyplucker on the rescue... Another one doesn't bite the dust! |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 04/28/2008 : 23:46:59
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Here's the original thread if anyone wants a gander...
http://bossarea.com/forum/topic.asp?TOPIC_ID=3982
Don't think anyone caught the fact the opamp was reversed, HP said it started making swooshing sounds all the sudden. Or even the fact it was because the opamp holder is orientated the same way.
Did a gremlin come along and switch you opamp?
Maybe Dr.Bob can pass it by an Aussie witchdoctor and shake the gremlins out
Dr.Bob,
Whats your impressions of the Monte mod?
Not that I'm endorsing the idea of modding CE2s
It had the Hi-fi and Rate mods? |
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happyplucker
Bronze Member
United Kingdom
126 Posts |
Posted - 04/29/2008 : 10:10:53
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yes, a belated public thank you to dr bob, and to all you guys who pitched in with ideas.
i hope there are no gremlins in my ce-2 however, it wont be getting wet so i should be safe 
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 04/29/2008 : 17:27:47
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quote:
Originally posted by ChristoMephisto
Here's the original thread if anyone wants a gander...
http://bossarea.com/forum/topic.asp?TOPIC_ID=3982
Don't think anyone caught the fact the opamp was reversed, HP said it started making swooshing sounds all the sudden. Or even the fact it was because the opamp holder is orientated the same way.
Did a gremlin come along and switch you opamp?
Maybe Dr.Bob can pass it by an Aussie witchdoctor and shake the gremlins out
Dr.Bob,
Whats your impressions of the Monte mod?
Not that I'm endorsing the idea of modding CE2s
It had the Hi-fi and Rate mods?
Hi Christo & Guys
I was sort of hoping that one one asked that question.
On first impressions, & after playing with it for more than an or so,
It no longer sounded like all the CE-2's that I have grown to know.
While I won't protest that the mod does add something to the CE-2, it's my opinion, that it takes away more than it adds.
I personally prefer the CE-2 as it is, unmodded.
I have a gut feeling that the mod also slightly changes the shape of the waveform of the clock, thus altering the familiar sweep of the signal.
The shape of the clock signal is very important on Chorus's-Phasers-Flangers, & for each the shape is different.
I have been thinking about this for a few days now, & I will definitely be doing a dual trace comparison of the modded & unmodded clock signals.
Christo the simple answer is, I prefer the unmodded CE-2
Apologies to HappyPlucker, if that's somehow condescending of all the effort he went to to mod it.
And same goes to Monte for all his efforts in designing the mod.
Overall, it still sounds good though, just not my cup of tea.
All of us here, know that tone is very personal & subjective.
And I have stated it many times.
"When the Roland engineers designed the CE-2, that got it/something just right".
Regards Dr. Bob
PS. I'm now waiting for all the flack & fallout... |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 04/29/2008 : 18:19:59
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quote:
Originally posted by Dr. Bob
Hi Christo & Guys
I was sort of hoping that one one asked that question.
On first impressions, & after playing with it for more than an or so,
It no longer sounded like all the CE-2's that I have grown to know.
While I won't protest that the mod does add something to the CE-2, it's my opinion, that it takes away more than it adds.
I personally prefer the CE-2 as it is, unmodded.
I have a gut feeling that the mod also slightly changes the shape of the waveform of the clock, thus altering the familiar sweep of the signal.
The shape of the clock signal is very important on Chorus's-Phasers-Flangers, & for each the shape is different.
I have been thinking about this for a few days now, & I will definitely be doing a dual trace comparison of the modded & unmodded clock signals.
Christo the simple answer is, I prefer the unmodded CE-2
Apologies to HappyPlucker, if that's somehow condescending of all the effort he went to to mod it.
And same goes to Monte for all his efforts in designing the mod.
Overall, it still sounds good though, just not my cup of tea.
All of us here, know that tone is very personal & subjective.
And I have stated it many times.
"When the Roland engineers designed the CE-2, that got it/something just right".
Regards Dr. Bob
PS. I'm now waiting for all the flack & fallout...
Wellll.... I have to say that chorus is my favorite effect type. I actually own variations on the chorus theme in many different guises:
CE-2 (MIJ 1981)
CH-1
CE-5 (analog - same chipset as CE-2)
UC100 (Behringer)
POD
Alesis Quadraverb
Alesis Quadraverb GT
Lexicon rack-mount PA multi FX (cant recall the model)
Built-in FX on various mixing boards (Soundcraft and Behringer)
And I've tried lots of chorus pedals in stores (e.g. Wasabi).
Up front, let me state I haven't heard the Monte Allums mod. But let me also say that the only chorus FX I've ever heard that really sound superb to my ear with guitar are the CE-2 and the CE-5. Boss got it right. Period.
With similar apologies to happyplucker and acknowledgement to Monte Allums good work, this is something I think you don't really want to muck around with. I haven't even done the ACA to PSA mod to my CE-2 and I'm not gonna change the 1uF capacitors no matter how much I've advocated that in other threads 
Dr. Bob, I'm on your team.
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Edited by - Laurie on 04/30/2008 04:31:06 |
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CE-2 Problem - RESOLVED - CE-2 Now Back home
