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LTV-824 Optocoupler understanding
LTV-824 Optocoupler understanding
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Old 3rd February 2019, 12:51 PM   #11
OrbitalLex is offline OrbitalLex  United States
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I have had to use a hot air gun to give it a boost on older gear occasionally
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Old 4th February 2019, 07:58 PM   #12
Paulmongan is offline Paulmongan  Ireland
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Well guys thanks for the help but Iíve never seen anything like this. I broke the master pot trying to get the knob off. I heated it a little with the quick hot air station and tried carefully prising it off with a flat head screwdriver. It prised off ok...broke at the base. Iíll have to look for a c250k to replace it and drill out the base of the old knob. I think these pots where not meant to be taken off the front display in this model.
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Old 4th February 2019, 08:37 PM   #13
OrbitalLex is offline OrbitalLex  United States
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Unless someone glued the knob to the shaft, they are indeed designed to be removed. Aluminum shafts don't like to be bent much.
RV16AF-20-15S1-C250K-LA Alpha (Taiwan) | Mouser
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Old 4th February 2019, 09:13 PM   #14
Paulmongan is offline Paulmongan  Ireland
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Yes you’re 100% correct. I’d say they someone used glue in this case.
Thanks for the link.
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Old 4th February 2019, 09:17 PM   #15
OrbitalLex is offline OrbitalLex  United States
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Btw, Mouser has an Ireland distribution center
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Old 13th February 2019, 10:46 PM   #16
Paulmongan is offline Paulmongan  Ireland
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Join Date: Feb 2014
Location: Ireland
Iíve replaced all the electrolytic capacitors, replaced all the opp amps. Iíve tested all resisters/diodes/non polarised caps and reworked the complete opp amp board. I still have hum on the bass pot and the sound of the sea on the hi treble and noise on the middles when I turn the eq pots.

Iíve made a little signal tracer where I can listen in to the input (iPod) and follow it along the circuit. Itís clear all the way until it hits The other side of R19. Iíve marked noise where I can here the noise and good when it is clean.
The transistors all test good with there respective voltages.
If it is the pots at fault surely they all wouldnít be faulty. And the problem there is I canít remove the knobs because they are stuck for eternity...

Any help would be greatly appreciated
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