Search results

Everyone needs such "parts" equipment, powerlot! Thanks for having a look at your CRO. Your Vg measurements seem preferable for their sameness. Mine make no sense to me. I was fairly dousing the input parts with Freezer and that drove either trace off-screen for an instant. I will take any...

Some pics: No fault (CRO is still upside down to expose Vert preamp pwb). Removing the case/chassis part which supports the front rubber feet improves access (2 screws)

Hello powerlot Yes, I reflowed the accessible connections on the little pwb that supports the ACDC switch. I wasn't game to reflow the wired connection to the rear of the BNC as I predicted too much work if the wire 'jumped' away from the connector. There's too little space there! Further...

Thanks powerlot Covers are OFF I'm employing my Kikusui CRO to compare the Hitachi Channels with the CAL signal applied to the inputs. CH1 is a reference of sorts (read on). I've had mixed "results" (fault is now intermittent and can sometimes be induced by freezing of input components): 1...

Thanks powerlot No control, except the AC/DC switch has any unexpected action. Probes are OK, Ch 2 BNC maybe dodgy but I feel that's not all. I omitted to say that I have an ESR meter and an Atlas semicon tester. The former may be a way to isolate a faulty electro. Roj.

Additionally, operating the AC/Gnd/DC switch of the faulty channel (Ch2) into the DC position, the trace 'sits' upon ~+8vDC rather than on 0vDC. Ch1 behaves as expected.

Hello VCFers I'm a retired serviceman from the scientific instrument field. I have a seldom used portable Hitachi V-509 CRO which I find, after a long period of dormancy, has a Ch2 vertical problem. This CRO was seldom needed but always carried into the field so has done a lot of miles in my...