From yahoo Sent Wed, Feb 15th 2017, 08:55
From yahoo Sent Wed, Feb 15th 2017, 08:55
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 > -----Ursprüngliche Nachricht----- > Von: xxxxxxx_xxxx@xxxxxxxxxxx.xxx [mailto:xxxxxxx_xxxx@xxxxxxxxxxx.xxx] > Gesendet: Mittwoch, 15. Februar 2017 01:14 > An: xxxxxxx_xxxx@xxxxxxxxxxx.xxx > 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 xxxxx@xxxxxxx.xx [Doepfer_a100] > <xxxxxxx_xxxx@xxxxxxxxxxx.xxx>: > > 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: xxxxxxx_xxxx@xxxxxxxxxxx.xxx [mailto:xxxxxxx_xxxx@xxxxxxxxxxx.xxx] > >> Gesendet: Montag, 13. Februar 2017 09:00 > >> An: xxxxxxx_xxxx@xxxxxxxxxxx.xxx > >> 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 <xx.xxxxxx@xxxxx.xxx> > >> ------------------------------------ > >> > >> > >> ------------------------------------ > >> > >> Yahoo Groups Links > >> > >> > >> > > > > > > > > ------------------------------------ > > > > ------------------------------------ > > > > > > ------------------------------------ > > > > Yahoo Groups Links > > > > > > > > > ------------------------------------ > Posted by: Ryuichi Tamura <xx.xxxxxx@xxxxx.xxx> > ------------------------------------ > > > ------------------------------------ > > Yahoo Groups Links > > > ------------------------------------ ------------------------------------ ------------------------------------ Yahoo Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Doepfer_a100/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Doepfer_a100/join (Yahoo! ID required) <*> To change settings via email: xxxxxxx_xxxx-xxxxxx@xxxxxxxxxxx.xxx xxxxxxx_xxxx-xxxxxxxxxxxx@xxxxxxxxxxx.xxx <*> To unsubscribe from this group, send an email to: xxxxxxx_xxxx-xxxxxxxxxxx@xxxxxxxxxxx.xxx <*> Your use of Yahoo Groups is subject to: https://info.yahoo.com/legal/us/yahoo/utos/terms/