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MTX JH1200 repair
MTX JH1200 repair
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Old 20th November 2020, 02:21 PM   #11
Perry Babin is offline Perry Babin  United States
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Shoulder can't be rail voltage AND the waveforms you posted. Maybe someone else can help.
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Old 20th November 2020, 02:31 PM   #12
tobyret2 is offline tobyret2
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Quote:
Originally Posted by Perry Babin View Post
Shoulder can't be rail voltage AND the waveforms you posted. Maybe someone else can help.
it's all google translator) the amplifier turned on, there is sound. The only thing that confuses me is the hot tip29 tip30 lm337 lm317 and two A92 transistors on the output stage driver. Is it normal that these elements get warm?
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Old 20th November 2020, 02:35 PM   #13
Perry Babin is offline Perry Babin  United States
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It's normal for voltage regulators to heat up.

Are the TIP transistors generally clamped to the heatsink?

Try a different translator (try several). Convert from your language to English and then back to your language to see which translator gets the closest to the original statement after the second translation.
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Old 20th November 2020, 04:26 PM   #14
tobyret2 is offline tobyret2
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they are all in TO-220 and without heatsink. I think to put radiators, they get very hot. I also don't like how the coolers work, they spin very slowly.
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Old 20th November 2020, 05:04 PM   #15
Perry Babin is offline Perry Babin  United States
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How many LM317s and how many LM337 do you have in the amp?

In other MTX amps, the fans are controlled by output level as well as heat. Have you tried driving the amp to clipping (no load necessary) to see if the fans ran faster?
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Old 20th November 2020, 07:28 PM   #16
tobyret2 is offline tobyret2
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1pc lm317 and lm327. I tried to warm up, the revolutions did not change. As for the level, I have not tried it.
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Old 20th November 2020, 09:33 PM   #17
Perry Babin is offline Perry Babin  United States
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Did you answer this question?

What is the voltage on all 3 terminals of each regulator?


How did you heat up the heatsink to test the thermal response?

Are you sure that it was sufficiently hot?

Did you try heating the thermistor itself?
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Old 23rd November 2020, 09:16 AM   #18
tobyret2 is offline tobyret2
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lm317 1-13.8v 2-15v 3-60v
lm337 1--13.7v 2--51v 3--15v
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Old 23rd November 2020, 09:20 AM   #19
Perry Babin is offline Perry Babin  United States
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What about the other questions?
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Old 23rd November 2020, 09:43 AM   #20
tobyret2 is offline tobyret2
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Just probed tip29c .... After removing tip29c tip30c lm317 lm337, the cooler started to rotate as expected. The volume level and heating of the thermistor with a soldering iron did not give a result. Maybe there should be zener diodes instead of diodes?
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