I'll check tonight when I get back to the bench if there is voltage in the socket with the ic removed. When I curve traced the outputs with the chip out on a bread board referenced to ic ground point

R-1051 for one. Glenn WB4UIV -- ----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign:

That happened here a few weeks ago. Fluke 8000A DMM. After a transient, it would only display even digits. Turned out the 7447 display driver developed an internal short on its 1's input. The MOS

I saw that once in a 2456B's CRT. An internal weld between a strap and an element broke, leaving an open circuit on the CRT's intensity (control) grid . The symptom was the intensity started out

There is a 5uf, wet tantalum capacitor, C171, in the z-axis output amplifier that sometimes degrades to a condition between open and shorted. It has direct control over the intensity. Also

While fixing my newest 465 I recall seeing a post where a 465 had a similar problem. The OP found an internally disconnected Grid pin. Here is the

The 7904A has a screen protect - anti burn circuit. Mine functions exactly the same as well. The service manual calls this out though I forget which page it is on.

Hello, I have a 7904A and it works exactly as you describe. I consider that normal, nothing to worry about. Just a minor annoyance. Tom Bowers

Hello dear friends, I own three beautiful oscilloscopes from the series 7000: a 7904A, a 7104 and - the most recent arrival - a 7854. Some of them had common issues, after powering on (failure at the

Larry, Here is that Older TI Logic Cross Reference link: https://www.ti.com/lit/ml/scyb017a/scyb017a.pdf I find this useful from time to time. -- Michael Lynch Dardanelle, AR

I would guess it had not been soldered correctly from the factory. I've had a intermittently faulty HP monitor that had the same problem, the component lead just hadn't "wetted" correctly. One

There is one bomb which has a tube based radar.  It is being modernized and tubes will be replaced on the new version.    

By any chance are you in SXM?

I recall reading somewhere (years ago) that some military receivers were running a few amps in the front end to protect against emp. Anybody verify or was it an apocryphal tale/April fool

In the Caribbean

First of all Harvey, Happy New Year 2020 and wishes of lots of health and great ELECTRONS in your life! If it wasn't for you, my scope would not work, so I trust you and wish you are my

It absolutely does. I was just reading a paper about this the other day. Several factors contribute to circuit failure due to aging. One being that the solder bond weakens apparently due to

My experience with this symptom has been always a DC restorer problem, even I bought a defective R&S scope with this symptom and the problem was the DC restorer diodes as I was figuring out. Also I

Good Day, Dennis, a word of thanks for looking after this group and for all the time you have spent in order to keep this a friendly and informative place! I was happy to contribute 20. Sent per

from Tim P (UK) The posts re '465M junker' remind me of a post I sent a couple of years ago. I had a 1S1 plug-in that was intermittent, sometimes OK, sometimes just would not sample. Did the usual