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A501 / Z501 Luxkit Amplifier schematic
A501 / Z501 Luxkit Amplifier schematic
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Old 9th March 2019, 04:18 AM   #11
SONDEKNZ is offline SONDEKNZ  New Zealand
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Default LUXKIT Z501 - Protection Circuitry Problems!

Guys

My LUXKIT Z501 is a gorgeous sounding amp that gave my FIRST WATT J2 a run for its money - the Z501 is that good.

However, last time that I fired it up, it seems like the protection circuitry just locked me out. Instead of the operation LED turning green for go, it just stayed red - winking off and on, if I recall correctly.

It seems to me that it's probably just a failed component somewhere, as this is a very old amp.

I have a the schematic that is posted earlier in this thread, which I believe to be correct, but I don't know where to start to find the Protection Circuitry components.

Is anyone able to shed some light on this for me? Appreciated.

LUXMAN Avance Z501 Frontal Shot.JPG

LUXMAN LUXKIT Avance Z501 Control Panel JPG Adapters 2.jpg
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Old 9th March 2019, 05:46 AM   #12
SONDEKNZ is offline SONDEKNZ  New Zealand
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Default LUMAN Luxkit Z501 Manual & Schematic...

Have attached the manual which includes the proper Z501 Schematic towards the end...
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Old 9th March 2019, 09:33 AM   #13
SONDEKNZ is offline SONDEKNZ  New Zealand
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Default LUXMAN Luxkit Z501 Manual & Schematic...

Let's try that again...

Have attached the Z501 Schematic...

LUXMAN Luxkit Z501 Schematic.PNG
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Old 9th March 2019, 01:14 PM   #14
druidaudio is offline druidaudio  Wales
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A501 / Z501 Luxkit Amplifier schematic
It could be that the protection circuit is doing its job and there is a fault somewhere?
Unless everything settles properly, the output relays will not click in, so check for dc on the inputs (points P1 & P2) to those as a first measure.

Last edited by druidaudio; 9th March 2019 at 01:19 PM.
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Old 12th March 2019, 04:25 AM   #15
SONDEKNZ is offline SONDEKNZ  New Zealand
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Default Why DC at the output???

Thanks DRUIDAUDIO.

Seems like the protection circuitry is just doing its job then, which the manual states is: "...when a DC voltage exceeding approximately + or - 2.5V is detected at the speaker terminal."

So I guess I need to find out why?

Even with our (normally fully operational) speakers unplugged, the Protection Circuitry disables operation. This rules out any problem emanating from the speakers, I guess.

I have looked over the amp very closely, looking for burnt components, stray wires, poor connections, etc. and everything seems perfectly intact.

Previously, this amp has performed flawlessly, so that gives me some hope of resolution.

QUESTION: Where should I start, to find the source of this unhelpful DC voltage?

Thanks for helping me with this. Internal photos provided, in the event that someone spots something obvious.
Attached Images
File Type: jpg LUXMAN LUXKIT Avance Z501 Internal 1.jpg (810.2 KB, 200 views)
File Type: jpg LUXMAN LUXKIT Avance Z501 Internal 2.jpg (801.7 KB, 198 views)
File Type: jpg LUXMAN LUXKIT Avance Z501 Internal 3.jpg (790.9 KB, 192 views)
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Old 12th March 2019, 05:19 AM   #16
SONDEKNZ is offline SONDEKNZ  New Zealand
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Default DC Voltage across P1 and P2 measures 6.8Vdc!

DRUIDAUDIO

Sorry, I forgot to note this below.
So it seems that there's plenty of DC (6.8V) measured across P1 and P2.
Not good obviously, but I'm not sure where that leads me next...
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Old 12th March 2019, 05:58 AM   #17
SONDEKNZ is offline SONDEKNZ  New Zealand
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Default Resistors seem to measure okay...

I am currently checking resistor values as quite impressively, this amp has clear component values stated in every position.
I haven't found any duds yet, but this assumes (for the moment) that they are fully connected beneath the circuit boards - which are still in place.
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Old 12th March 2019, 08:03 AM   #18
pitbul is offline pitbul
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I am sorry if I will say this, did you check your input, if something with DC voltage is connected to your input amplifier will shift output also to some DC voltage. Try to disconnet input terminals and then check is it working. Maybe it is some DC mV on your preamp output. This is DC amplifier.
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Old 12th March 2019, 08:32 AM   #19
SONDEKNZ is offline SONDEKNZ  New Zealand
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Default Protection Circuit active, even with no input connected...

Thanks PITBUL.

I double checked my input - which is currently a CD-player direct - with no change of status.

Because this amp features separate GAIN pots, it can be run very successfully without a preamp with all of our speakers.

So, the Protection Circuit remains active, effectively locking the amp up and preventing any warm-up or anything.
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Old 12th March 2019, 08:36 AM   #20
SONDEKNZ is offline SONDEKNZ  New Zealand
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Default Protection Relay perhaps?

I did wonder if the early 1980s Protection Relay may need to have the contacts cleaned - and was therefore causing the problem.

But thinking this through, I estimate that the Protection Circuit wouldn't work at all, if this were in fact the issue. Perhaps I have this wrong?

In any event, I have given the Relay itself a bit of a firm "tap" on the head - as you do - just to see if it is somehow "stuck".

No change of status. Protection Circuit remains active, locking the amp up completely.
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