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"Gareth Magennis" <soundserviceleeds@outlook.com>: Jul 21 07:31PM +0100 Hi,   can't find any schematics for this module - its a Bang & Olufsun combined SMPS/Class D audio amp PCB.   The one I have has the exact same fault as this one: http://forum.recordere.dk/uploads/36113/icepower3.jpg     Blown cap (presumably), but no way of finding out what it was. There are other photos on the Interweb of this board which show the unmarked device not blown up.   There's about 330v DC across the remains, and my amp module still works without it.       This is in a powered Studio Monitor Sub, seems these modules are reasonably popular in this kind of thing - B&O would not sell these to the public, though I read on a forum while Googling today that they might now, but are prohibitively expensive.     Any smart guesses what I should be putting in there? One end goes to the three paralleled resistors which are very low ohmage and I guess current sense at ground, the other goes to the first pin of the transformer which is at high HT.     Cheers,     Gareth.

N_Cook <diverse@tcp.co.uk>: Jul 21 08:18PM +0100 On 21/07/2016 19:31, Gareth Magennis wrote:   So a stock fault means what was in there was not right spec. I would trace out the associated comps to get an idea what it was doing. Condsruction type of cap? Volume would give , for the type of construction, assuming 400V rating an idea of its capacity. Put 2 caps in there of 250V rating or 1 600V rating and whatever nF will physically go in there.

N_Cook <diverse@tcp.co.uk>: Jul 21 08:25PM +0100 On 21/07/2016 19:31, Gareth Magennis wrote:   Do barrel format SMD-R have a higher voltage rating,r for r, than slab formats?

makolber@yahoo.com: Jul 21 12:41PM -0700 > > the three paralleled resistors which are very low ohmage and I guess > > current sense at ground, the other goes to the first pin of the > > transformer which is at high HT.   another way to figure it our is this...   look up the data sheet for the active devices on the board.   often the data sheet will have schematics for example applications and often the UUT is pretty much exactly like the app notes.   M

N_Cook <diverse@tcp.co.uk>: Jul 21 09:26PM +0100 > look up the data sheet for the active devices on the board.   > often the data sheet will have schematics for example applications and often the UUT is pretty much exactly like the app notes.   > M   Perhaps the supervisor IC, nothing of use on driver http://datasheet.octopart.com/STW11NM80-STMicroelectronics-datasheet-24223.pdf

"Gareth Magennis" <soundserviceleeds@outlook.com>: Jul 21 09:32PM +0100 wrote in message news:24311c0a-ea31-4180-8dd8-16e7cb545f72@googlegroups.com...     > > the three paralleled resistors which are very low ohmage and I guess > > current sense at ground, the other goes to the first pin of the > > transformer which is at high HT.   another way to figure it our is this...   look up the data sheet for the active devices on the board.   often the data sheet will have schematics for example applications and often the UUT is pretty much exactly like the app notes.   M               Cheers, I am being a bit lazy, but you do tend to learn a few things by asking questions here as well :)   http://www.farnell.com/datasheets/87884.pdf?_ga=1.33261950.1327271115.1429123757   Page 2 - the cap is probably a small bypass cap not on the schematic on the transformer HT winding to ground.       Thing is, this component looks like the achilles heel in this particular design, unless duff components were sourced. Else something else is blowing the component.       Gareth.

N_Cook <diverse@tcp.co.uk>: Jul 21 09:38PM +0100 On 21/07/2016 21:32, Gareth Magennis wrote:   > Gareth.   The Rs and C connected to CS pin3 of the supervisor?   http://www.onsemi.com/pub_link/Collateral/NCP1203-D.PDF

"Gareth Magennis" <soundserviceleeds@outlook.com>: Jul 21 09:51PM +0100 Failure of this cap blew the PCB mounted mains fuse, rendering the unit dead and requiring repair, so this is definitely a known issue.     Gareth.

N_Cook <diverse@tcp.co.uk>: Jul 22 07:12AM +0100 On 21/07/2016 21:51, Gareth Magennis wrote:   > Gareth.   This DVD apparently uses NCP1203, not downloaded the schematic though http://www.go-gddq.com/upload/2009_07/09070211291778.pdf

N_Cook <diverse@tcp.co.uk>: Jul 22 09:02AM +0100 Shinco DVD-2610 on Elektrotanya assuming the SJK is an HV diode and 2x 4148 in the pic, then probably much the same circuit

JC <Chipbee40_SpamNo@yahoo.com>: Jul 21 03:54PM -0400 On 7/18/2016 12:10 AM, Black Iccy wrote:   > Base Mod by Mod freq (rate) > 3Khz +/- 'x'Hz @ rate 'y' > 3000 30 4   Thanks to you and Phil for the info, proved to be very useful and Adobe Audition seems to be the way to go.   Couple of problems arose.   I need 3 test signals:   JIS (3KHz) 1% @ 4Hz CCIR (3KHz) 1% @ 4Hz (Same as JIS? Am I missing something here?) DIN (3.15KHz) 1% @ 4Hz   These should, according to the limited service info I have, produce a 1% reading on the meter for each relevant setting (JIS, CCIR,DIN)   JIS was giving me 0.5% so I read up on the Adobe Audition settings and I guess i needed mod by 60 hz, (+/-30Hz). That gave me 1% display with JIS but then doubles up on the CCIR/DIN giving 2%   JIS is supposedly an effective mean reading, CCIR/DIN are Peak, but I'm not making sense of these readings, any ideas?   Amplitude of the input signal has no effect as long as its large enough to register.   TIA.

Ralph Mowery <rmowery28146@earthlink.net>: Jul 21 04:30PM -0400 In article <KL9kz.5883$zu3.1431@fx21.iad>, Chipbee40_SpamNo@yahoo.com says...   > Amplitude of the input signal has no effect as long as its large enough > to register.   > TIA.   The JIS, CCIR, and DIN are standards set by different countries.   JIA Japan CCIR Mainly countries of or were of the British Empire DIN Germany   You probably will not be able to adjust for all 3 countries standars at once.       --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

JC <Chipbee40_SpamNo@yahoo.com>: Jul 21 04:36PM -0400 On 7/21/2016 4:30 PM, Ralph Mowery wrote:   > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus   This is the Leader LFM-3160, there is a switch for each JIS, CCIR, DIN.

c4urs11 <c4urs11@domain.hidden>: Jul 21 08:42PM On Thu, 21 Jul 2016 16:30:56 -0400, Ralph Mowery wrote:   > CCIR Mainly countries of or were of the British Empire   It would be troublesome to image the Empire calling it then "Comité Consultatif International des Radiocommunications".   Cheers

Bob <bobrweber@gmail.com>: Jul 21 02:37PM -0700 On Thursday, July 21, 2016 at 3:54:24 PM UTC-4, JC wrote:   > Amplitude of the input signal has no effect as long as its large enough > to register.   > TIA.   Are you sure the modulation is a since wave (See Phils post above). This looks like a peak to average of a square wave pulse. I would try an actual analog generator with low distortion (in the 4 hz tone also) modulated and calibrated like Phil suggested. One way to check if I am correct is to listen to the tone and see if its frequency smoothly goes up and down or just snaps between high and low points. If it is hard to hear set the mod rate to 1 hz instead of 4.   ...Bob

JC <Chipbee40_SpamNo@yahoo.com>: Jul 21 05:47PM -0400 On 7/21/2016 5:37 PM, Bob wrote:   >> TIA.   > Are you sure the modulation is a since wave (See Phils post above). This looks like a peak to average of a square wave pulse. I would try an actual analog generator with low distortion (in the 4 hz tone also) modulated and calibrated like Phil suggested. One way to check if I am correct is to listen to the tone and see if its frequency smoothly goes up and down or just snaps between high and low points. If it is hard to hear set the mod rate to 1 hz instead of 4.   > ...Bob   Yes, a possibility but I tried a square wave and I still get JIS giving half the value of CCIR/DIN. A.Audition seems to generate a decent waveform, I'm monitoring the signal on a scope so I know what I'm inputting.

Black Iccy <Daedelus@whereamIinvalid.com>: Jul 22 11:29AM +1000 >but then doubles up on the CCIR/DIN giving 2%   >JIS is supposedly an effective mean reading, CCIR/DIN are Peak, but I'm >not making sense of these readings, any ideas?   It looks to be a problem of deviation. Carrier +/- 30Hz (i.e. 60Hz overall) or Carrier +/- 15Hz (i.e. 30Hz overall)   Though this is not the OP's machine, the numbers referenced in here (below) imply a 15 Hz departure from 3150 (or 3000) http://exodus.poly.edu/~kurt/manuals/manuals/Other/LEADER%20LFM-39A%20Claibration%20Procedure.pdf * See page 3   My suggested Audition generation will do sine/square/saw/inverse_sine. The modulation is also sine. Write output waveform to a calibration CD.

Phil Allison <pallison49@gmail.com>: Jul 21 07:51PM -0700 JC wrote:   > but then doubles up on the CCIR/DIN giving 2%   > JIS is supposedly an effective mean reading, CCIR/DIN are Peak, but I'm > not making sense of these readings, any ideas?   ** You have been misled by the wording of the manual - the test signal itself is not being specified, merely the NAME of the test signal.   The actual test signal comes from a special calibration unit where the varying parameters of the several standards have been taken into account - such that using each gives a 1% reading on the meter when set to the matching range.   Inside the meter, once the raw W&F signal has been derived, it is first "weighted" via a filter that emphasises frequencies around 4Hz and is then rectified and measured via a peak reading or average reading meter. W&F tests often use RMS values too.   The use of a dedicated calibrator or a test CD seem to be the only methods possible for results that reliably comply with the various standards.       .... Phil

JC <Chipbee40_SpamNo@yahoo.com>: Jul 21 10:52PM -0400 On 7/21/2016 9:29 PM, Black Iccy wrote: > * See page 3   > My suggested Audition generation will do sine/square/saw/inverse_sine. > The modulation is also sine. Write output waveform to a calibration CD.   Yes, that's what I am doing, same thing though, JIS reads exactly half of CCIR/DIN with either +/-30hz or +/- 15Hz. I checked the components for the JIS rms section, bridge/cap etc, all ok. I don't see why I get half on JIS. Something is either wrong with the calibration instructions or the meter itself. (I am using some of the LFM-39A instructions but I believe the cal is applicable to the LFM-3160).

John Keiser <johnkeiser@juno.com>: Jul 21 03:08PM -1000 On 7/15/2016 5:02 PM, John Keiser wrote: > Simplex connectivity. > When I open up the chassis, what am I looking for as a likely culprit? > Thanks.   Here's my follow up for future reference or comment: I think the physical DVD device may be polled in the turn-on/boot-up process. If the physical DVD device fails to respond appropriately, the boot-up fails and the DVD won't turn off and can't find the internet, wired or wifi. At that point, the DVD needs to be unplugged.   The work around seems to be to have a DVD in the tray. Open and close the tray once or twice with the remote until the DVD disc is recognized. The player then see the internet and can be turned off normally.   Sound logical?

plastic.goldfish@gmail.com: Jul 21 12:24PM -0700 On Sunday, May 6, 2012 at 6:42:04 PM UTC-7, David Farber wrote: > --   > David Farber > Los Osos, CA       On Sunday, May 6, 2012 at 6:42:04 PM UTC-7, David Farber wrote: > --   > David Farber > Los Osos, CA   This is awesome! I have a similar problem with my brother cs-80 and it is great to find this. Thank you so much, this is super helpful. I just ordered a new tire ring for my machine, which also melted, now I'm just waiting for it to arrive. :)

"Michael A. Terrell" <mike.terrell@earthlink.net>: Jul 21 01:53PM -0400 John Robertson wrote:   > Did the Senco company get sued out of business by the widows?     I've heard that they changed their name to Sencore in 1957.

N_Cook <diverse@tcp.co.uk>: Jul 21 12:09PM +0100 Stock fault ? Phones o/p but no sp o/p. Both pcb traces to the main bridge rects fried. 2xLM3886 seem ok cold DVM "test". Both main caps good ESR and capacity, diodes test ok. Both main caps bowed ends and one with brownish dried "wax" at the cross, presumably electrolyte but no hole seen. All the caps on the PA are Xunda, don't remember seeing that name before, suspect? presumably China. Main caps are radial Xunda RK series, 3300uF,50V 105 deg C, the supposed glue to the pcb has (heat?)failed and they can flop around on axial-type gauge of terminals, not snap-in.

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bleachbot <bleachbot@httrack.com>: Jul 20 07:53PM +0200

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