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Old 30th September 2004, 01:32 AM   #1
ozaudio is offline ozaudio  Australia
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Red face Luxman L-100



I have a luxman L-100 amp that when turned on no longer engages the output relay.

For some time now it has been taking longer and longer for the relay to stay latched on, sometimes taking up to 15 mins with the relay clicking on and off before it latches on for good.

Does anyone have a schematic of this part of the amplifier that you could email me or any ideas as to what the problem could be?

What is the purpose of this relay and why does it take time for the amp to latch the relay when first turned on?

Any help appreciated,

Jason.
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Old 30th September 2004, 04:04 PM   #2
djk is offline djk
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You have a capacitor in the relay circuit that has dried out.

Due to the age of the piece it would be worthwhile to replace all of the electrolytics in the amplifier.

Digi-Key and Mouser are good places to buy from, call and get a catalog on paper.

You're in OZ so you're on your own for parts.
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Old 1st October 2004, 05:40 AM   #3
hjelm is offline hjelm  Sweden
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As for the purpose of the relay it is to avoid turn on thumps and possibly DC out on the speaker terminals. Some amplifiers also have overload protection of the output stage via the relay.
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Old 1st October 2004, 09:02 PM   #4
anatech is offline anatech  Canada
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Hi Jason,
It looks like about a 47uF at 50V. I think it's charged through D902. I can hardly make out the printing on the schematic. This is the most likely one. Some of the small caps in the same area may have failed as well. Try this before going on a cap changing blitz.
-Chris
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Old 1st October 2004, 10:12 PM   #5
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My best guess:
Bipolar cap(s) should be replaced in relay circuit.
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Old 1st October 2004, 11:21 PM   #6
djk is offline djk
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bad guess, the bi-polar caps filter out audio from tripping the circuit, the main RC time constant cap is the more likely culprit.

Now if he had said that the relay was tripping on loud bursts of audio I would tend to agree with you.
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Old 2nd October 2004, 01:31 AM   #7
anatech is offline anatech  Canada
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Hi djk,
You've seen this before too huh. Djk is right, power supply cap for the relay circuit or any of the timing caps.
-Chris
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Old 18th April 2005, 06:46 AM   #8
rajue is offline rajue  United States
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Default Diode HZ-22-2l for luxman l-100

I am looking for a supplier for this diode hz-22-2l
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Old 18th April 2005, 07:12 AM   #9
Netlist is offline Netlist  Belgium
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It's a low noise 22V zener.
If you can't find it you might try 1N4115 or the BZV39 series equivalent.

/Hugo
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Old 18th April 2005, 07:22 AM   #10
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Hi ozaudio,

please check if there is no DC Offset in your output
stages. Probably is is drifting more than usual,
and the protection circuit just does it's job and
disconnects the speaker from the output if a
given DC threshold is passed.

Regards,
Stephan
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