Electronics > Repair

Hioki 3532-50 LCR Repair (One major problem solved, SM still wanted)

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Martin72:
Today the regulator arrived and I must correct me, there are no ordinary 78/79XX types on the board, they´re LDO types..
The original one is hard to get so I took one from TI, but with non-isolated case.
Therefore I´ve ordered electric isolating heatpads and thermal paste additionally, everything from amazon, including the LDO.
I guess on friday I can exchange the both and then....we will see.
Martin

coromonadalix:
Normally the metallic will be fine,  and if you have over minimum 2 volts between in  and out    it should regulate fine ....

That's why an LDO is preferred

Nice scope  BTW   :-+

Martin72:

--- Quote ---That's why an LDO is preferred
--- End quote ---

I know and this is something it nerves me a little bit because I didn´t pay attention on the inputvoltage of the original LDO.
This I´ll do before exchanging it on the weekend.
But I must say, this is already done in my head, I expect this problem is solved then and my thoughts are with the touchpanel, which I couldn´t find anywhere in the www....


--- Quote ---Nice scope  BTW
--- End quote ---

Absolutely, actually I´m very confident with it. :D

coromonadalix:
Unless you have a slow rising voltage before the regulator ??  like an defective rectifier bridge, cold solder ??

Maybe take some measurements with everything connected normally??  even if it could or will do the boot problem ??

Martin72:
Hi,

Indeed I must make some more measurements:
Today I wanted to desolder the original LDO at work because of the double-layer pcb ( more powerful solder station there).
Before I´ve powered it on with a external dc voltage of about 10V - And measured proper 5V at the output of the LDO and with less ripple noise.
This means it must be something wrong with the rectifier bridge, the cap or the ac source from the transformer.
Will look at it on friday.

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