SPL Z1X-3000D missing parts - diyAudio
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Old 3rd March 2012, 11:43 AM   #1
Mote is offline Mote  Estonia
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Default SPL Z1X-3000D missing parts

Bought the amp from ebay, seller did not make no secret of what was going on in the amp, still I decided to give it a try.

Amp is missing: RCA jacks, cooling fan (which is a critical part of this amplifier as I have heard), some PS caps, all PS FETs, most of their drivers, loads of resistors, rectifier, some of the big jumpers which connect PS FETs to ground and as a added bonus: FETs went out in flames and board is carbonized where they used to be and some traces do not exist anymore because of the heat.
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I get a good signal on pads of power supply FETs drivers, so the first thing I will do is replace them, try to clean out the carbonized board, remove rectifiers, install PS FETs and see if I can get power supply running, any other recommendations?
Any idea what could have caused this kind of failure?
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Tools: Perrys tutorial, C1-76 o-scope, Weller WHS40, Mastech MAS830L multimeter, Mastech MY6243 LC meter, 16A supply
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Old 13th March 2012, 06:36 PM   #2
Mote is offline Mote  Estonia
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Installed one IRFZ44N in each bank (4 in total), new rectifiers, 3 new PS caps. It was impossible to find the right size caps, I found a bit bigger caps, only a few millimeters but it made it quite difficult to fit them in the amp. I had to leave 3 old ones in at the moment. Amp does not draw excessive current. There is +/-60V on rectifiers center legs.
But there is no output on speaker terminals.
On one bank of outputs there was square on 2 legs and rail voltage on 1 leg.
On the other bank I see rail voltage on one leg, square on other and something weird on third leg.
Do they look right?
First picture is signal on speaker terminal, no input or input, output is the same.
2ms/0,1V.
Second picture is square on ouputs, 2us/10V.
Third picture is signal on third leg on one bank of outputs, 1us/10V.
I did not check signals on driver board, I checked the two drivers on the board which are likely to overheat and fail, they were not shorted but I will replace them anyway like Perrys tutorial suggests.
Attached Images
File Type: jpg DSC00029.JPG (107.3 KB, 10 views)
File Type: jpg DSC00030.JPG (72.9 KB, 11 views)
File Type: jpg DSC00032.JPG (63.5 KB, 10 views)
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Tools: Perrys tutorial, C1-76 o-scope, Weller WHS40, Mastech MAS830L multimeter, Mastech MY6243 LC meter, 16A supply
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Old 13th March 2012, 08:09 PM   #3
timwebb is offline timwebb  United States
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u should find them on any old power acoustic if u can find one.
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Old 13th March 2012, 08:10 PM   #4
timwebb is offline timwebb  United States
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i think the drivers are ktc1027 and ktc1023
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Old 14th March 2012, 04:47 AM   #5
Mote is offline Mote  Estonia
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I fitted the caps in so I will leave them as they are until I get the amp to work properly. Spare parts are not a problem, I bought everything I need: PS FETs, their drivers, outputs drivers, new fan etc.

At the moment I would like to know: do the signals on the outputs look fine?
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Tools: Perrys tutorial, C1-76 o-scope, Weller WHS40, Mastech MAS830L multimeter, Mastech MY6243 LC meter, 16A supply
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Old 14th March 2012, 04:52 AM   #6
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The waveform in the 3rd image isn't locked so there's no way to judge that one. It should swing from the negative rail to about 10v above the negative rail. The center one is probably OK. It should swing to about 10v over the positive rail.
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Old 14th March 2012, 06:05 PM   #7
Mote is offline Mote  Estonia
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Waveform which I did not get a lock on earlier:
This time settings are 1ms/10V.

In the tutorial one of the driver board outputs has similar waveform, so it is correct?

I did not have time to troubleshoot it further today, I had to put together Hifonics Brutus first, that is for a paying customer, SPL is mine at the moment.

Tomorrow I will try to trace input signal, see if it makes it to the driver board.

Shorted output filter inductor should cause the amp to draw current?
Attached Images
File Type: jpg DSC00034.JPG (59.1 KB, 12 views)
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Tools: Perrys tutorial, C1-76 o-scope, Weller WHS40, Mastech MAS830L multimeter, Mastech MY6243 LC meter, 16A supply
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Old 15th March 2012, 12:11 AM   #8
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It looks OK.

If you're unsure about the output filter inductors, look at the signal on the terminals of the inductors. They are in series. The point on the board that connects the inductors should have exactly 1/2 of the amplitude of the square wave on the terminal that's connected to the FETs. The inductor terminal that's connected to the filter capacitors should have essentially no square wave visible (scope set to 5v/div or higher).
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Old 15th March 2012, 05:31 PM   #9
Mote is offline Mote  Estonia
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Inductors are probably OK, waveforms are like you described.
From the tutorial I did not understand whether the input of the driverboard should have audio signal or already PWM.
I traced audio from RCA jacks and already on the second opamp IC102 there is no clean audio. Scope was grounded to RCA shield.
Only clear waveform I could find on that opamp is on the picture, that waveform was constant, no matter if input was 100 Hz sine or just music.

I replaced the opamp, just in case, but that made no difference.

Is it safe to say that output and PS are working correctly and the fault is in preamp/driver board?

Scope settings: 1V/1us.
Attached Images
File Type: jpg DSC00036.JPG (71.1 KB, 10 views)
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Tools: Perrys tutorial, C1-76 o-scope, Weller WHS40, Mastech MAS830L multimeter, Mastech MY6243 LC meter, 16A supply
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Old 15th March 2012, 05:38 PM   #10
Mote is offline Mote  Estonia
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I read from brandes.cm thread on the same amplifier that audio should be traceable up to driver board. I tried the master/slave switch postitions but nothing changed.
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Tools: Perrys tutorial, C1-76 o-scope, Weller WHS40, Mastech MAS830L multimeter, Mastech MY6243 LC meter, 16A supply
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