Lanzar OPTI1400D Repair Help - diyAudio
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Old 25th September 2013, 11:10 PM   #1
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Default Lanzar OPTI1400D Repair Help

I have a Lanzar OPTI1400D that appears to have been repaired before unsuccessfully. I am looking for either a schematic or for someone else with gut shots to help identify parts and/or part location numbers since they are not visible. The part I am holding in one of the pictures is what was attached to the board right beside what appears to be R252 very poorly and fell off when I touched it. One of the power terminals looks to have been soldered on top of as well.


Here's some photos:
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Old 26th September 2013, 12:10 AM   #2
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R252 is likely a 100 ohm resistor.

R101 (220 ohms) is generally the one that burns in that area and causes that sort of damage.
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Old 26th September 2013, 01:32 AM   #3
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Thank you very much for the values.

Is R101 the one directly to the right of R252 in the second from top picture? Also, what is the value for the component directly to the right of what I believe to be R101 in the second picture. I can't read the markings on the board clear enough to tell.

What causes this type of failure and is there anything else to check for?
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Old 26th September 2013, 09:29 AM   #4
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It generally happens when the positive speaker wire shorts to chassis ground but can happen if the power transformer is shorted (possibly, intermittently).

The component is likely C101. It's a 0.1uf capacitor.
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Old 27th September 2013, 09:27 PM   #5
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Thanks for the help and input. What voltage rating should I get? Would 50V be fine or should I get 100V?
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Old 27th September 2013, 11:16 PM   #6
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For C101, if it's defective, 50v would be OK. There is never any significant voltage applied to it unless one of the faults I listed occur.
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Old 28th September 2013, 02:31 AM   #7
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I got the amp repaired and tested good. C101 turned out to not be defective but R101 was the one that had been replaced before by the previous owner and was connected on top of the old leads since they didn't remove the board. They put silicone on top of it to hold it but just fell off.

So R101 was replaced with the correct 220 ohm 1/8W resistor and I repaired the loose/broken power terminals and speaker terminals. I also used the Kapton tape on the heatsink since the old insulator was damaged and coming off. Thanks for the help.
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