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| T i m <news@spaced.me.uk>: Jul 29 05:27PM +0100 Hi All, I fired my Ansmann Energy 16, cell battery charger up earlier to charge 4 x D NiMh's and initially it looked like it was behaving normally but when I looked at it again a few minutes later, there were no LEDs illuminated? ;-( Checked the mains (3A) fuse and it was blown, so I removed the cells, replaced the fuse, tried it again and it blew again. I took it to bits, blew a bit of dust out of it and running the DMM over it on low Ohms, it seems there is a fairly low resistance across the AC input (~ 2 ohms). <https://www.dropbox.com/s/r93ghlg58qgcxhv/Ansmann%20PSU%20top.jpg?dl=0> <https://www.dropbox.com/s/yx4vg5td3mqkiu2/Ansmann%20PSU%20bottom.jpg?dl=0> I then disconnected the PSU and (carefully) ran it up on the bench and again, the fuse blew instantly (however, I'm not sure if it's ok to run the PSU like that with no load etc)? I de-soldered one end of both the input filter caps, and the first transformer and the very low resistance went away on the input side (so it wasn't a shorted cap) but was still across the board where the txfmr output was. FWIW, of the 4 bridge rectifier diodes D1-4 in the middle of the board, D2-3 test out ok in cct, D1,4 test as short cct. All the other diodes and caps around that part of the circuit seem to test out ok on the DMM (diode test, cap continuity charge 'beep' upon probe connection) so I was wondering if someone could point me in the right direction re checking it out further etc please? Given there isn't much else on that board, is it likely it's the first txfmr, one (or both) of the TOP223Y's (PWM switch) and how could I test them if it was please? Or could it be the (PC817) opto-isolators as I assume they would be fairly easy to test out of the board? Thanks for your help in advance ... ;-) Cheers, T i m p.s. I might have got some of the above wrong so please assume that to be the case as I don't want to mislead anyone. ;-( |
| guijarrosoy <algenta@gmail.com>: Jul 28 12:09PM -0700 Hi colleagues. Trying to fix this console that is having a few burned resistors. I am interested in obtaining schematic diagram and service manuals if possible. Thanks and regards. guijarrosoy@hotmail.com |
| "Gareth Magennis" <soundserviceleeds@outlook.com>: Jul 28 08:30PM +0100 "guijarrosoy" wrote in message news:d696fe99-3536-4e99-b04d-eb28d9bcf261@googlegroups.com... Hi colleagues. Trying to fix this console that is having a few burned resistors. I am interested in obtaining schematic diagram and service manuals if possible. Thanks and regards. guijarrosoy@hotmail.com ************************************************************************ https://elektrotanya.com/tascam_m-208_m-216_sm.pdf/download.html Gareth. |
| "Gareth Magennis" <soundserviceleeds@outlook.com>: Jul 28 07:44PM +0100 "Phil Allison" wrote in message news:cb0e3a2a-7c7b-494b-9e6b-762b0de1796b@googlegroups.com... Gareth Magennis wrote: ------------------------------- > *********************************************************** > Sounds pretty likely, I bought them a long time ago. ** Look like them ?? http://www.canford.co.uk/Images/ItemImages/large/23-064_01.jpg ************************************************************ Probably decided at the time I didn't really need the mu-metal casing, but yes, this is the type I got. Don't know what impedance, but got 1:1 versions. http://uk.farnell.com/oep-oxford-electrical-products/a262a6e/transformer-audio-1-1-1-1/dp/1689033 The 4 Neve donuts went into a couple of isolator boxes at live gigs. Still use one box between the live system and the recording laptop / soundcard. Gareth. Gareth |
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