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All LEDs should go off once boot is complete and the initial hardware check is finished. ?D13 being left on indicates there is a problem with the 68230 (U57) Parallel Interface/Timer. ?See Table

Hi, I think you may have lost the calibration constants, at least the ones related to the display. You'll have to do a blind test. The soft buttons near the screen, the top one is #1 and the

Ok I replaced the battery this am and all went great, yes I did copy the info as the manual states. my new issue is the display as you will see in this video. I thought maybe I missed a connection

Hi Jeff. I feel your pain. And FYI, the power supply is a pain to work on. The PCB is held by a number of plastic stand-off type things that you have to squeeze closed and work the board out. But if

Yes, the RTC is on the processor board and gets power through the connector to the SRAM board where the battery is located.? When the SRAM card is removed, you lose the time. Regardless of the

==== I assume you already found service manual sheet with all the data to be copied to paper for insurance. There is a super capacitor on the battery board, if it is still good it lasts long enough to

Friends, My HP8935 is displaying the AA Memory Battey Low message, but the batteries are not low.? I am wondering if anyone else has experienced this. Thanks! Jeff KC8VFN

This morning, I tried running it using a DC power supply and that led to it blowing the 15 Amp external fuse for DC power.? As I mentioned yesterday, if you try to use on AC, it blows the external 5

Sold the VNA, however, have the local ops manual, very handy with full view foldout. Also, Digital Radio Measurements text. PM me direct, make offer, shipped media mail. Thanks, Alan

I am not certain it is a 3456B. I got that number from a phone conversation from someone selling a pair of these meters, and a recollection from seeing said meters at a hamfest last year. I will be

Anyplace to attach an outside power supply so data doesn’t need to be re-entered when replacing battery? Andrew

FWIW, I can't put my hands on my '94 catalog at the moment, but the 3456A is no longer in the '95 one - it has the 3457A & 3458A. -Pat ?

And your attempt worked. Thanks. DaveD KC0WJN [email protected]> wrote:

Yes, after I posted I looked around and found several good-quality copies. I did that backwards! DaveD KC0WJN [email protected]> wrote:

Dave Daniel suggested that he maybe should scan and make a pdf out of his HP3456<<<A>>> manual. I was trying to head that off. I looked in the following catalogs: 1986 - 3456A 1987 - 3456A 1988 -

I've never heard of a 3456B. I don't think there is one. It'd be very interesting to learn if that's not so. Radu. [email protected]> wrote:

You have a failed power supply/ Almost certainly the main switch Q1 a MOSFET. This can also take out the feedback transformer T2 which is a PITA. You can ty DC input, see

Nice copies of the various HP3456A manuals are available on Ko4bb.com -Chuck Harris <kc0wjn@...> wrote:

Hi Are the Cal signal at w9 ok-about -25 ?—if so I guess you have the same fault we have seen in the MXA series-bad switch at Rf Front end.. Regards Hardy Fra:

AC fuse as in the mains side? My first check would be if there are no RIFA X/Y caps that have died & shorted. Wilko