Doepfer

Dear Dieter,

Thank you very much for the suggestion. As a weekend DIYer, I have
built a handful of thru-hole-component modules. So I will definitely
try to replace the LED (of course, before doing that, I will collect
information to make sure that I should be really skeptical about it).

Doepfer oscillators are always my first choice to play with me. I
really love your products. Thank you for producing A-100 modules, and
I am looking forward to seeing the new 110-6 oscillators!

Best Regards,
Ryuichi Tamura


2017-02-15 17:48 GMT+09:00 yahoo@doepfer.de [Doepfer_a100]
<Doepfer_a100@yahoogroups.com>:
> Sounds to me like a defective LED. If you are familiar with soldering and
> electronics you may try to replace the LED by another dual type, e.g.
> red/green or red/yellow (the white/blue dual LEDs are hard to find and is a
> custom made product).
>
> Best wishes
> Dieter Doepfer
>
>> -----Urspr�ngliche Nachricht-----
>> Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
>> Gesendet: Mittwoch, 15. Februar 2017 01:14
>> An: Doepfer_a100@yahoogroups.com
>> Betreff: Re: [Doepfer_a100] A-110-4: LED for negative part is OFF most
>> of time
>>
>>
>> Dear Dieter,
>>
>> Thank you very much for your kind reply. Yes, with no signal being fed
>> in LFM, the led of my 110-4SE does not light up in white for LFrq
>> positioned in the negative range. This is the issue  of my unit
>> (although the FM sound from it seems fine..)  Following your insight,
>> my unit is still defective. So I will have to find a way to repair it.
>> Thanks again for your support.
>>
>> Best Regards,
>> Ryuichi Tamura
>>
>> 2017-02-13 21:24 GMT+09:00 yahoo@doepfer.de [Doepfer_a100]
>> <Doepfer_a100@yahoogroups.com>:
>> > Hello,
>> >
>> > without external LFM signal the LED should light up white when
>> you turn the
>> > LFrq knob CCW. When you turn the LFrq knob CW the LED should light blue.
>> > Otherwise the module is defective and has to be repaired.
>> > As soon as an external LFM signal is applied the blue/light
>> share depends
>> > upon the position of the LFrq knob and the LFM level.
>> >
>> > Best wishes
>> > Dieter Doepfer
>> >
>> >
>> >> -----Urspr�ngliche Nachricht-----
>> >> Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
>> >> Gesendet: Montag, 13. Februar 2017 09:00
>> >> An: Doepfer_a100@yahoogroups.com
>> >> Betreff: [Doepfer_a100] A-110-4: LED for negative part is OFF most of
>> >> time
>> >>
>> >>
>> >> Hello there,
>> >>
>> >> This is my first post, and I am sorry for writing message as follows.
>> >> But, I would like to have any advice or suggestion for my A-110-4SE,
>> >> which seems to malfunction.
>> >>
>> >> A few months ago,  I accidentally touched its circuit board while it
>> >> was powered. Since then my A-110-4 did not generate the negative part.
>> >> Specifically, with Lfrq knob being around the center, only the half
>> >> (from the positive part) of modulation was heard. It sounded like "the
>> >> half of the modulation is gone."  The bicolor led was only lit in blue
>> >> when the positive part is modulated.
>> >>
>> >> As I have no knowledge about the circuit, all I could do was to
>> >> replace all ICs with the new ones, and I did. After replacing all the
>> >> ICs, and all the calibration procedures documented in
>> >> "A110_4_trimming_potentiometers.pdf" being done,  the unit seemed to
>> >> revert to its healthy state, in terms of the sound I heard.
>> >>
>> >> However, the led still does not work properly. The led is *rarely* lit
>> >> in white. Currently, the led is either lit in blue, or off most of the
>> >> time, and occasionally lit in white.
>> >>
>> >> So, my concern is that this irregular behavior the led may cause
>> >> another trouble or fault.  Is it ok to keep using it, or is there any
>> >> part in the circuit I should investigate, or is it better to ask the
>> >> Doepfer for repair?
>> >>
>> >> Thank you very much.
>> >>
>> >> Regards,
>> >> Ryuichi Tamura
>> >>
>> >>
>> >> ------------------------------------
>> >> Posted by: Ryuichi Tamura <ry.tamura@yahoo.com>
>> >> ------------------------------------
>> >>
>> >>
>> >> ------------------------------------
>> >>
>> >> Yahoo Groups Links
>> >>
>> >>
>> >>
>> >
>> >
>> >
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>> >
>> > Yahoo Groups Links
>> >
>> >
>> >
>>
>>
>> ------------------------------------
>> Posted by: Ryuichi Tamura <ry.tamura@yahoo.com>
>> ------------------------------------
>>
>>
>> ------------------------------------
>>
>> Yahoo Groups Links
>>
>>
>>
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