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One of the tricks on old equipment is to power the eprom from a separate power supply and adjust the voltage up or down until the checksum passes, then copy that data out and burn a new part. Don't

"vk2bea via groups.io" <vk2bea@...> writes: Excellent! Thanks Michael. Looking forward to the 546 and 547 too. Matt

I have the 545A, 546A and 547A. The manuals from HP are of poor quality. I've just done a scan of the 545A and uploaded it. (

OK Yves....Thanks for the ?TP diagrams and wave forms, I'll try to find the failure. ?Nice scope! ?About 30 years ago I had and HRO-500 with germanium transistors that had a phase lock loop that

Yes, you're right, I didn't notice. I would create new pieces but no image available.

P27128A is an EPROM - you can't flash that. Get a new empty one an use a programmer. Am 09.11.2023 um 15:14 schrieb David ?áda:

I have a dead HP 9153A disk drive, it had blown power supply fuses. The fuses were replaced, the power supply is fine. The yellow error LED flashes when the disk drive is turned on. Nothing more

From what I see, this looks a lot more like the original layout. If the packages were different, I'd have gone with a 90 degree rotation on the amplifiers.? However, unless you do a staggered layout

Alrighty, I've tweaked the layout a bit. I rotated the amplifiers by 45 degrees to straighten the traces. Also sprinkled a couple more vias around the place here and there. If this looks good, I'll

The following files and folders have been uploaded to the Files area of the [email protected] group. * /All HP, Agilent and Keysight instruments in folders by part numbers/000 to

I've uploaded the scan here:

Hank, I did the same tests as you, and unsurprisingly, it's different. If the PRETUNE signal does not work, you need to repair A11 PRETUNE signal before going any further. In this case, it's just

Yves Here is what I get with the 8743d PRESET with Port 1 ?connected to my SA. ?Any MEAS tests have no impact . ?There's a peak at 392.588 KHz -63.8 dBM.

... of a cheap and simple OXCOs upgrads from Ebay? Otherwise, I'm lost.

Yves… Thanks! That is providing some insight I didn’t have before. Tom, N8ZM Sent: Wednesday, November 08, 2023 3:33 PM To: [email protected] Subject: Re:

Yves OK, let me know what you find. ?I also noted the cnt: .997 MHz which fluctuates around 1 MHz. ?I'll ?turn it off. ?On the left side as you noted there's a P? which you said is low power but I

Hi Tom, You have already verified that the YIG does not carry any power output from 300kHz to 6GHz if I understood correctly, from 10kHz to 300kHz, it is not the YO which is the source. The PCB on A3

Having emailed Simmconlabs some time ago, they kindly informed me that they now had LCD replacement kits for the 1345 display in stock. I ordered one, installed it and the result was a delight! As an

Hi, I think you may not have done the right test, I notice this when looking at your results, we see that the frequency counter is activated on the right. But not having the same firmware version I

Hey Yves Here's what I get ?YO coil check, I did it twice and both times same result, pic ?enclosed. ?Does this mean A11 is bad and A# could e OK? ?Please give the steps to for this question; "An