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Some 7B53As have video sync. I have two. Don't really use that feature but they work fine anyway. Might check those manuals as well. Also, Is that feature good for anything else? Bob

Do you have a dual time base, a 7B87, or a 7B80/7B85 (or equivalent) which you could use to check if the A intensified by B display is correct? I wonder if your readout troubles are related. The

Denis: I'll email some photos: the pages are larger than my scanner bed. John

Yup. Blanking looks good to me... I'll double check the pot, and make certain its smooth. It looks like I have some reading to do in the manual....(this is certainly going to be umm.. interesting)

Thanks. I did pull out the HV probe and measured the HV TP on the z-axis board- -2985V. This is with two plugins loaded. I will try your other suggestions later, gotta run right now for other

The regulated voltages at P1896 all look fine. Note that the pin 2 voltage at 129.5 is right where it should be after you adjusted R1293 for what I assume is +55 at TP1625. The unregulated voltages

Thanks David. Here are my current readings after adjusting R1293/TP1625 and R1513/-50V: At P1896: Pin 2 (+130V): 129.5 Pin 3 (+50V): 50.0 Pin 4 (+15V): 15.07 Pin 5 (+5V): 5.02 Pin 6 (-15V): -14.98 Pin

Are the parts that are supposed to be blanked getting blanked? -ls- David Holland <david.w.holland@...> wrote:

I would not count on the potentiometer being good. With age the wiper in that type tends to become open and intermittent which can be repaired by cleaning it. I need to clean those potentiometers on

<keitho@...> wrote: The voltage at TP1625 is controlled by U1635 to regulate the -3kV supply and indirectly the CRT acceleration voltage. It will vary with the total load on the power

Hello all, I'm kind of getting around to poking at my 7854 scope. The stored trace brightness is excessive, and the adjustment won't go down any further. I'm reasonably certain the pot is good, since

On TV sets, this is a sign of a bad CRT.

Still working on this R7903 repair, still at this point concentrated on the PS. The PS is no longer in tic mode- yea! The service manual says to adjust TP1625 for +55 volts plus-or-minus 25 volts.

from Tim P (UK) Interesting ! I have an'add-on' Sync Seperator box (015-0016-00) which outputs selected line or field sync to the delayed sweep trigger. I had an old analog camera with the lens

PL259 or UHF.? Seen a lot in HAM radio. ? Here is an adapter to BNC: http://www.amazon.com/BNC-Female-PL259-Male-Adapter/dp/B000VGUCTM

Hi Joe, No worries, I think the following message from G?ran shall get you started: See http://tech.groups.yahoo.com/group/TekScopes/message/77881

Hi all: i would be very very appreciated if you can tell me how to manage these 2 ics.(acq board u501&u502,sn:tek 234 0718 40) i got no 250Mhz signs from these 2 ics. they are dead? i approved the

ill look into 3-in-one oil, i think ive seen some before around the machine shop at my university. I see that you painted the carts of your 555 scopes? this might come off as another dumb question,

first I would like to say thank you for the very clear advice. I have been slowly going through the manual since the day i got the scope, but i definitely need to read it thoroughly instead of just

Look at the LM1881 video sync IC for more ideas on good ole NTSC stuff. This is one of the most elaborate, yet simple to use ICs for decoding and triggering of video signals, and National's datasheet