Author Topic: Kikusui COM7101A  (Read 4021 times)

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Offline mcookieman

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Kikusui COM7101A
« on: November 04, 2012, 11:05:57 am »
I recently bought a hybrid oscilloscope off ebay, 4 channels at 100MHz with a 50Ms/s digitizer, as some may have seen in the buy/sell forum.
When I got it the cursor/readout display was too far to the right (half of it was not shown) so I opened it to adjust it, following the instructions in kikusui.co.jp/kiku_manuals/C/COM7000A_E2.PDF There were also some other issues (overscan of the trace, underscan when in B timebase) that I couldn't figure out how to adjust so I just left it.
Overall, I'm pretty pleased with it, the only real problem seems to be the scope takes a few minutes for the display to stabilise. (Before that it shows up compressed horizontally and is jittery)
Took some photos while I had it opened.

Front panel

quite a lot of toshiba chips, CRT is toshiba as well I think.
Does anyone know what the crud near the bottom is?

More crud

Bottom of the Oscilloscope with most of the adjustment pots and a lot of hybrids.

A few more photos http://imgur.com/a/P7PLN
 

Online PA0PBZ

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Re: Kikusui COM7101A
« Reply #1 on: November 04, 2012, 03:51:34 pm »
Check the caps in the power supply and in the X and Y amplifier.
Keyboard error: Press F1 to continue.
 

Offline mcookieman

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Re: Kikusui COM7101A
« Reply #2 on: November 07, 2012, 06:54:56 am »
Opened it up again (more photos! http://imgur.com/a/IjHUk)
I couldn't figure out how to open up the power supply section fully but visually inspecting the capacitors all of them seemed to be fine, no bulging.
I think the squashed display might have something to do with the time base switches as the squashness of the display changes when the switch is rotated (or the x10 mag is pressed)
I've attached a photo of the power supply caps and what the display looks like on startup.
 


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