Electronics > Repair

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

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Martin72:
The new LDO ordered from amazon got a different pinout... :P
Before I´ve checked the AC-Voltages, all seems to be OK.
Rectified, the DC inputvoltage for the LDO is about 8.4V - that would be enough to use an ordinary 7805 for testing only.
More and more I think a cap was damaged, because without the regulator the DC voltage is clear without remarkable ripple noise.
Will find it out on saturday.. 8)
Still no response from hioki, I guess I won´t get any answer from them.

TERRA Operative:
I'll send off an email in Japanese this weekend.

Maybe if they can read the email they won't ignore it.... :-DD

TERRA Operative:
I made a login for the Japanese website and scoured both Japanese and USA website for documents.
Doesn't look like there is a service manual available for download, but I'll still send that email and see what happens.

Below is a Google Drive link to what I found so far, you'll need to use google translate for some of them. But there are English and Japanese versions of most of the documents. (Installing google translate on your phone to use the camera to read the Japanese can get you by)

https://drive.google.com/drive/folders/1b338VuEMozyoGD3ITF6zMTojXjcmHjgN?usp=sharing

As a bonus I found LabView drivers and a sample application software thingo for pulling data via serial to generate csv files etc.

Martin72:
Success !
With the ordinary 7805 regulator I get a clean 5V for the controllerboard, result: Immediately booting up after powering on... :D
Got slight problems of a mechanical nature because of the non-isolated package but this is nothing against the fact I´ve found the failure...
So one mature failure is solved, things to polish:
- Battery Clip, the old one can be used after cleaning, will follow.
- Original regulator (LDO) will be searched, in this time:
- Correct mounting the 7805 onto the backside.

Next mature failure is waiting, the touchpanel.... :-\
It´s getting more and more worse, nearly no response...must have it new, but where to buy..
Need the SM or at least a list of the spareparts part-numbers, in the hope I could buy it.
And then the very yellow frontpanel, but this is cosmetic, not top of the list.
To be continued with a summary todo list..

coromonadalix:
There is some receipe on the web  to remove yellowish color from plastics

Peroxyde  or bleach   .....

https://cleaning.lovetoknow.com/cleaning-tips/how-whiten-yellowed-plastic-simple-safe-methods

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