Hioki 7020 - looking for service manual

[DavidKo]

Hello,
I'm searching for service manual for Hioki 7020. Hioki official statement is that it is long time unsupported device. Some frequencies are out of the range. There is lot of trimpots and test points inside, but the marking does not give a hint.

At least I have dumped the FW 1.20 if someone can have a use for it

[DavidKo]

To my surprise the device uses universal transformer. After some measurements I have changed the "jumper" to from 100V to 240V one (one cable is not necessary, but I do not waste him, so I have only doubled the connection that is already there).

I have also replaced the input filter before doing this. I have bad experience with X2 caps in old devices

[DavidKo]

Some pictures

The picture of the first board is missing. During the first repair I have dumped the FW, but I forgot to make a picture  . It cannot be removed without removing the front panel.

[DavidKo]

It looks that service manual is unobtainium. I have tried to ask for it, but the reply is that they will not calibrate it and it is unsupported device.

At least the user manual is still available online on their site https://www.hioki.com/download/29153