From: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
Sent: 13 February 2018 12:39
To: Doepfer_a100@yahoogroups.com
Subject: Re: [Doepfer_a100] Troubleshooting lack of power on LC9
PSU 2 is the older supply, it’s definitely 1200 ma -12v, 1200 +12v, if you add a 5v adapter that takes some from the positive, depending on load. The current draw you listed should be well within limits.
Get a few of those glass slow blow fuses, I was in a similar position a few years ago and blew the first replacement while I was finding the cause of the fault. Mine was a badly inserted ribbon cable
On 13 Feb 2018, at 10:44, 'Tim Burgess' tim@raisedbar.net <mailto:tim@raisedbar.net> [Doepfer_a100] <Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> > wrote:
Hi,
This is the point I’d like clarification on myself. A U.K. dealer has told me that there’s 1200mA available spread across both the positive and negative supplies, so I’m confused.
Best wishes.
Tim Burgess
From: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> [mailto:Doepfer_a100@yahoogroups.com]
Sent: 12 February 2018 18:20
To: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>
Subject: Re: [Doepfer_a100] Troubleshooting lack of power on LC9
as far as i know, the Doepfer PSU2 gives 1200mA's for +12volts, AND 1200mA's for -12volts.
correct me if i am wrong.
_____
From: "'Tim Burgess' tim@raisedbar.net <mailto:tim@raisedbar.net> [Doepfer_a100]" <Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> >
To: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>
Sent: Monday, February 12, 2018 3:40 PM
Subject: RE: [Doepfer_a100] Troubleshooting lack of power on LC9
Hi,
Thanks again for the information. I’m going to have to go with the cheap option for now by pulling out some modules and replacing the fuse. I’ll then start saving up for a PSU3 and an engineer, or maybe buy a new LC9 with a built-in PSU3 and keep my current LC9 for less demanding modules (I could do with more space to grow).
Best wishes.
Tim Burgess
From: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> [mailto:Doepfer_a100@yahoogroups.com]
Sent: 10 February 2018 23:12
To: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>
Subject: Re: [Doepfer_a100] Troubleshooting lack of power on LC9
From the tech page:
Replacing A-100PSU2 by A-100PSU3
An existing power supply (A-100NT12 or A-100PSU2) can be replaced easily by the new A-100PSU3 because the A-100PSU3 has nearly the same dimensions and the four mounting bolts are at the same positions. Nevertheless the replacement or installation has to be carried out by qualified personnel only because the correct wiring of the mains connection is essential. And it's essential that all parts that conduct mains voltage (cables, pc board, electronic parts on the pc board) are mechanically protected against any contact with the human body (touch-proof, e.g. by using a cover for the power supply)... Otherwise there is Danger to Life ! Existing bus boards can be used. There is no need to replace the bus boards. Only if the +5V supply is required one has to add the cable(s) that connects the +5V terminal of the bus board(s) to the corresponding terminals of the A-100PSU3.
On Feb 10, 2018, at 1:39 PM, 'Tim Burgess' tim@raisedbar.net <mailto:tim@raisedbar.net> <mailto:tim@raisedbar.net> [Doepfer_a100] <Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> <mailto:Doepfer_a100@yahoogroups.com> > wrote:
Hi,
Just to add some figures to my previous post, my calculated module loads are:
+12V = 885mA
-12V = 568mA
Total = 1453mA
Best wishes.
Tim Burgess
From: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> <mailto:Doepfer_a100@yahoogroups.com> [mailto:Doepfer_a100@yahoogroups.com]
Sent: 10 February 2018 18:23
To: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> <mailto:Doepfer_a100@yahoogroups.com>
Subject: RE: [Doepfer_a100] Troubleshooting lack of power on LC9
Hi,
I got some eyes to check the glass fuse in the PSU and it’s blown. I thought I’d kept track of my current drain, but I’ve just recalculated and it looks like I may be over what the PSU can supply, hence my problems.
Can I please check my understanding of how I calculate my available maximum current drain before stripping everything down and attempting operation with a new fuse?
My LC9 has a V2 power supply, which I believe provides a maximum drain of 1200mA. Firstly, am I correct that this represents the total used by all my modules (i.e. the total of the +12V load and the -12V load). Secondly, if I’m operating within this limit, I’m assuming that I can have modules wherever I like, i.e. the 1200mA total isn’t broken up with a 400mA maximum for each row?
Since I don’t have another case to move any modules that are pushing me over the limit, how difficult would it be to replace my V2 power supply with a V3? Do I need an electrician for this, or could my technically-aware wife attempt it?
Best wishes.
Tim Burgess
From: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> <mailto:Doepfer_a100@yahoogroups.com> [mailto:Doepfer_a100@yahoogroups.com]
Sent: 06 February 2018 00:55
To: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> <mailto:Doepfer_a100@yahoogroups.com>
Subject: Re: [Doepfer_a100] Troubleshooting lack of power on LC9
You might just need to replace the fuse
Confirm what PSU model you have and refer to this page:
http://www.doepfer.de/faq/a100_faq.htm#Fuse
On Feb 5, 2018, at 11:08 AM, 'Tim Burgess' tim@raisedbar.net <mailto:tim@raisedbar.net> <mailto:tim@raisedbar.net> <mailto:tim@raisedbar.net> [Doepfer_a100] <Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> <mailto:Doepfer_a100@yahoogroups.com> <mailto:Doepfer_a100@yahoogroups.com> > wrote:
Hi,
I’ve been having some mail issues, so apologies if this has come through previously.
I have an LC9 case that is not receiving power when turned on. I’ve swapped the power cable out for the known good cable from my G6 case, but I still get no power to my modules. The case has been moved since the last time I used it – is it possible that a module’s connection is become partially-seated and this is preventing power-up? I’m a long way from anybody who could service the unit for me and I’m blind, so removing all of the modules and asking somebody to fit them for me again is something I want to avoid if a loose connection wouldn’t be a possible cause of the fault.
Any and all suggestions gratefully received.
Best wishes.
Tim Burgess
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