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Lanzar OPTIDRIVE 700X2
Lanzar OPTIDRIVE 700X2
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Old 21st July 2016, 11:40 PM   #1
Formas is offline Formas  Jamaica
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Default Lanzar OPTIDRIVE 700X2

Hey guys, I'm having a little problem with this Lanzar amp, I'm actually having 1.7 volts on the output of the right channel at idle no speakers, no input.
The amp was repaired before and that channel was left disabled for fear it would cause the output transistors to fail.
Does it needs biasing adjustment although it's a fixed bias circuit.
I would love to know the part value of C230 cap.
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Old 22nd July 2016, 12:24 AM   #2
Perry Babin is offline Perry Babin  United States
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Can't you use the corresponding part in the other channel to find the value?

Which is the right channel? 100 series parts or 200 series parts?
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Old 22nd July 2016, 04:31 AM   #3
Formas is offline Formas  Jamaica
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200 series part is the right side channel.
what could be the possible cause why i am getting that 1.7volts on the outputs? it doesnt push out the speaker when connected in the correct phase, but it has this "scratching" sound when you are connecting the wires with the amp on.
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Old 22nd July 2016, 05:35 AM   #4
Perry Babin is offline Perry Babin  United States
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The scratching sound is from the DC and the intermittent contact when connecting the wires.

If it doesn't push/pull the speaker, the DC is likely gong to near 0v when the speaker is connected. Is that the case?
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Old 22nd July 2016, 12:30 PM   #5
Formas is offline Formas  Jamaica
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That would very much likely the case although I haven't measured across the terminals after the speaker was connected at that point in time. I was just emphasizing a "scratching" sound against an "humming" to let you have the idea of the voltage I'm getting.
The cap on the left channel at C130 is 50v 10uf, the right channel at C230 is 50v 100uf which seems odd to me because every other component has identical mirrored look.
Ive tried the 10uf but there wasn't any significance so I've put back the 100uf which I think is the design as the legs was bent in place and the solder was untouched come to think of it.
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Old 22nd July 2016, 09:50 PM   #6
Perry Babin is offline Perry Babin  United States
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There are missing parts in the 200 series channel.
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Old 23rd July 2016, 06:32 PM   #7
Formas is offline Formas  Jamaica
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Nothing is missing apart from the A1962A output transistor.
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Old 23rd July 2016, 06:56 PM   #8
Perry Babin is offline Perry Babin  United States
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There are parts missing in the photo. Post a current photo.
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Old 24th July 2016, 12:53 AM   #9
Formas is offline Formas  Jamaica
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Only the audio output transistor, the drivers are folded underneath the board and braced against the heatsink chassis, there is nothing left out.
However I've found the problem it was a small signal transistor C3200 was reading 140k across the base and emitter.
It was replaced the the 1.7volts was gone amp was installed for a function tonight. Thanks again.
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Old 24th July 2016, 01:30 AM   #10
Perry Babin is offline Perry Babin  United States
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I'm glad you found it but the arrows indicate the parts that I was referring to.
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