Products > Test Equipment
Teardown - Hitachi V1065
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Miti:

--- Quote from: rbm on August 08, 2018, 03:02:29 am ---Interesting upgrade.  I have a V-695. I have to see if I can do this modification, or even if it is necessary to do it.  You modified X4101 on the PEF-875 board from a 12MHz resonator to a 12.000 MHz CL crystal if I understood correctly.

I'm not sure of the exact differences in the frequency display hardware between your V-1585 and my V-695.  If my V-695 scope is equipped with a PEF-782 board, would I consider doing this modification to X3101, which is also a 12.000 MHz crystal?

--- End quote ---

Most likely that's the ceramic resonators that you need to change. The easy way to validate that, apply known accurate 1MHz and see what the frequency reading you get. If it is bang on, you're good, you don't need to replace anything . Then touch one of the resonator's pin win an oscilloscope probe and observe if the counter reading changes. If it does, that's your culprit.
rbm:
Cheers!  thanks for the explanation.
Robinrayner:
Well just brought a vc6025 the digital storage version of the 665 and low and behold the same mode for the frequency counter works perfectly on that.
ulyanoff:
In search of a good analog oscilloscope I bought Hitachi V-660 on ebay. The device turns on, trigger is work , but the image is distorted. I already study the manual, I ask the advice of experienced specialists - this can be a defect in the CRT tube? :-[. Thank you. Photos from this topic are very similar to my device.
p / s / I think the problem in sweep generator PEF-865.
rbm:
A first step might be to replace capacitors on the boards.  They might have aged badly.
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