Re: electrovoice_zlx_15p up in smoke
I repaired two of these with similar problems a few months ago.
As well as replacing all the burned resistors & Q1 I also checked all components around the TL3845 and ended up replacing:
I2 = Gate driver IC TL3845
R62 - R71 = 1ohm resistors (replaced with single 3W 0.1ohm)
Q1 = Mosfet 17N80C3 replaced with Toshiba TK31E60X,S1X
R26 = 100ohm
C48 = 100nF
R120 = 180ohm fusible
C49 = 0.1uF
R28 = 150ohm
R100 = 100ohm
R121 = 680ohm
D10 = Bat54 (replaced...
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Re: peavey xr1212
Interesting ... that mixer uses the same amplifier board as the Peavey IPR1600 power amp ...
The original 2x components were IGBT's but several other fets can be used to replace.
Be a good idea to remove the amplifier side power fets and check them or you may blow the new PSU fets again on 1st power up.Last edited by check12; 06-18-2022, 05:29 AM.
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Re: Dynacord PowerMate 600 Powered Mixer - Protect Light On
Yeah that is a good question ... I see a high percentage of various failures in this area of the board.
I've had the chance to check a few of the speakers these damaged amps were attached to and quite often they have partially shorted voice coils resulting in very low impedance .. but how that translates to the damage I have no idea ... ...
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Re: Dynacord PowerMate 600 Powered Mixer - Protect Light On
Hi Capleaker, if it was pre-amp then there would have been imbalance of voltage on the collectors of the output devices.
If there was another problem it would have been obvious after fitting the jumper.
Most of the time these issues are caused by "pilot error" when the owners do outlandish stuff with other items they connect to them, that repair was fine ... might be back soon though if it was caused by e.g. a set of speakers with a partial voice coil short.
The "other...
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Re: Dynacord PowerMate 600 Powered Mixer - Protect Light On
Yeah that's just some faults I've noticed consistently with the larger one's ... and parts I just replace as a matter of course now to save time & increase reliability with these models.
I'll go and watch the vid, I see a few of these so it's always interesting to see other faults ...
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Re: Dummy loads for amplifier fault finding
5mins @ 6kW is plenty of time for a barrage of tests ... ...
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Re: Behringer europower pmp2000d (no output)
Actually here's better images showing the probe construction better ... wired to a plug or socket ... the grounding on the original link is a bit confusing if your new to this....
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Re: Dummy loads for amplifier fault finding
Yeah thought about distilled water when putting it together (which is pretty cheap) but got offered the oil free & it gives plenty time ... easy to build in thermometer or pressure releases too but I've never bothered ..
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Re: Dummy loads for amplifier fault finding
Here's a little something I put together for about £50 ... 2x 6kW 220v elements.
[url]https://www.aliexpress.com/item/32844634184.html?spm=a2g0o.order_list.0.0.21ef1802cXZQmO[/url]
A metal bin that I bought from local adverts and some suitable connectors and wire. Had to bend the elements a bit to fit in (pretty tough but they can be bent). I fitted them through opposing holes just below the bottom ridge on the metal bin (for the max amount of oil above them).
Elements are almost exactly 8ohms,...
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Re: Dynacord PowerMate 600 Powered Mixer - Protect Light On
Hi ... I've repaired a few of the larger version of these. They share the same amp design as Electrovoice Q44 & 66.
Virtually all the one's I've looked at are stuck in protect ...
Q140 etc. ARE on the schematic you provided but it's a busy diagram ... If you follow the centre line on Left channel to the L100 output inductor, then look down you will see Q140 just before the -VCC rail. If you look above L100 you will see Q142, 143 and friends ...
I really like these amps but...Last edited by check12; 05-29-2022, 09:09 AM.
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Re: Behringer europower pmp2000d (no output)
Your problem doesn't sound like a power issue so don't waste time poking about in the power supply.
There are no schematics available for this mixer/amp that I know of but it looks like a clone (which a lot of behringer designs are) of the Peavey XR684 with a few more flashy lights.
The problem is most likely a bad solder joint or cable connection somewhere as behr soldering quality control is terrible and they use the cheapest pcb's they can to keep costs down and your symptoms sound like a bad connection....
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Re: Acer G236HL, constant restart after energy star logo.
I just re-flowed ALL the larger diodes, regulators etc. in the area I was heating and now it seems to be back in service ...
Thanks for all your help anyway lotas!, the ch341 will no doubt come in handy for something else & I have learned some things.
If I had to buy IC's from Aliexpress I would just have bought a full pcb for £25: [url]https://www.aliexpress.com/item/32691442447.html[/url]Re: Acer G236HL, constant restart af...flowed ALL the
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Re: Acer G236HL, constant restart after energy star logo.
Nah reflow didn't work ...
But after heating for a few seconds now the monitor always starts properly.
I am using a hair dryer so the heat is over a wide area but it is centred over U5 ... which I think is the eeprom.
Anybody recognise this faults behaviour?
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Re: Acer G236HL, constant restart after energy star logo.
While waiting for the programmer ... I tried heating the board a few degrees with a low powered hair drier around U5 and the main processor... and after a few seconds of heating it boots properly to the "no signal connected" screen.
I think I will try re-flowing the IC pins ...
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