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| Hitachi Storage Scope V-134 |
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| xyloeye:
I have this scope also. I'm into audio - oscilloscope troubleshooting not so much. I can't find the manual either, so no schematic. Any idea where to start looking for what's causing this issue? This is a 1KHz square wave via coax and with 50 ohm termination. The controls seem OK. |
| Krusher:
It's an old beast, for sine waves it works fine. Seems that triggering is iffy. |
| DanMNYKstudios:
--- Quote from: xyloeye on February 23, 2020, 08:44:33 pm ---I have this scope also. I'm into audio - oscilloscope troubleshooting not so much. I can't find the manual either, so no schematic. Any idea where to start looking for what's causing this issue? This is a 1KHz square wave via coax and with 50 ohm termination. The controls seem OK. --- End quote --- Sort of a dead thread here. But I recently picked up a V-152B (a very similar model) and had a similar issue when first trying to get everything up and running. I took the cover off (be very careful. Stay away from the high-voltage areas, and make sure to unplug it and let the caps bleed first). I scrubbed all the pots for the front panel adjustments with a toothbrush and some electronics cleaner. And I don't just mean a light spray either. I sprayed quite a bit, then scrubbed each wiper. They were all covered in a dark soot. It didn't take me long at all. After that (give it a bit to fully dry) it runs like a charm!! Super clean signal. Was able to calibrate it and everything. I picked up a cheap modern probe (yours might be old and out of spec). You can find user manuals and service manuals for very similar models. I suggest going through and adjusting all the internal pots to get it properly calibrated. It's not hard, just takes some time. Hopefully, this will help anyone else with a similar issue with these old beasts. |
| kipp:
I found a document online that appears to be schematics for this model of oscilloscope. Attached below. I'm trying to fix a malfunctioning Toshiba 20M62 storage oscilloscope and the internet doesn't seem to think such a thing even exists, let alone have documentation for one. So I've been trying to identify Japanese oscilloscopes with similar features and of the same vintage in the hope that one of them turns out to be the same inside the box. This thread is how I learned of this Hitachi model, which led to find the schematics. For what it's worth, if anyone else is in the same boat, this Hitachi V-134 and the Iwatsu SS-5702A are so far, together, providing the closest approximation I've found of what's in the Toshiba. If somebody happens to have the Toshiba documentation that would be appreciated. |
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