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Great, glad the sync reset worked! It makes me wonder, however, if the CRT parameters were corrupt in SRAM, then what else might be corrupt? ?I would take a quick pass through the calibration

Thanky you for the valuable information Yves! I have now checked a bit further and made sure the VTO_TUNE reached the A9 Third Converter assembly ok. My VTO_TUNE voltage varies between -0.43 (10 MHz

I picked up the meters today. They are model 3456A. Both work, but need some cleanup. The power switch on on unit sticks on and the front/rear terminal switch is dirty. A quick checkout shows both

Reset worked Config, 6, 6, 3. Thank you!!!!

6.3Vdc

Hi, I tested this with my 8591A. I used an external generator for the 10 MHz reference. I measured the 300 MHz signal returning to the A15 COUNTER LOCK module. This way, I tested the path

Also, how is the voltage on your new battery? -mark

Odd that D13 would now be off.? We'll assume the 68230 and related circuitry is ok for the moment. Along the same lines as what Yves suggested, you could also try resetting the CRT to DEFAULT

Mark I took the boards back out and cleaned all the contacts good and seeded them in and out a few times now the lite D13 is off. I do still have the screen issue shown in the video. I also tried what

Hi, Hardyhansendk. Thank you for your response, As you mentioned about W9 cal signals, When I tested there I'm getting 50Mhz with -60dB not -25dB, it would be helpful if you share info regarding that.

After further digging into my Ref Unlock error message on the HP8591A Spectrum Analyzer I have found the following. The 600 MHz SAW oscillator on A9 Third Converter assembly seems to oscillate at only

Mark yes the display was normal.

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