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Harke, if that ROM is U32, that's the attenuator assembly cal constants ROM. Definitely make a backup of that & tag it with the serial number of your attenuator assembly if you ever end up with

I didn’t mean to suggest that but it’s an intriguing possibility. Peter

PeterG are you suggesting that the fan I used was a temperature sensing fan and this is what I was seeing where it began to roar at full speed after about 30 minutes? This would explain a lot. It was

Ouch. This is when you shoot the programmer, and all of his managment that allowed any of this to happen.

Now this can be nasty.... Well, there are only so many formats to consider. In terms of parallel, you look for lines changing, then some sort of control strobe. In terms of serial, you look for known

In this case, the power supply is for a 500W 2M amplifier. Maximum draw is about 20 amps @ 50 volts, and that's never more than 50% duty cycle for <5 minute periods, so the 50A continuous supply is

I have used temperature sensing fans as some are available with remote sensors which can be mounted on a hot item like a heat sink. You can’t always do this, for example the Tek 2465 scope with

Hello Group, I have obtained a very cheap HP8664A, but, of course, with issues. Ser no starts with 3744 but internal date codes show well into 2000. It has options 010, 004 and an oven. It has a

Very interesting! An only slightly related learning: A few months ago I wanted to replace the very noisy and over-rated fan on a power supply with something quieter. I got a nice unit that was a

*A lesson to be learned about fans.* *HP8753B Fan Repair* *Problem* The analyzer is not working *Symptoms* The fan is not running. The analyzer will not work if the fan is not running. *Repair* Fan

At 2019-03-24 12:53 PM, [email protected] wrote: Does anyone know where I can find a line cord to fit it? I found the operating and service manual, and I'd like to get it back to operating condition. I'll

BTW For finding clocks, a spectrum analyzer and a small H field probe is much better than a scope. Less risk of disturbing the circuit operation and it's easy to locate the clock lines even if they

I can't speak to doing this in HW, but I spent many years fixing large (>50KLOC) programs which had *no* comments other than the author's name. In the aggregate about 2 million lines. I relied on my

Hi Peter I don't know this instrument, but here a couple of things I would check.. I cant remember if you already checked this, but can you connect a coupler to the 3.8GHz oscillator, to tap of a

In addition to debugging my own designs, one of my common use cases for using logic analyzers is to peer into designs of existing hardware systems. These systems are sometimes poorly documented with

Not a problem. I sometimes wonder what I'd do with all the channels. Most

Responses in-line Heh. I was mostly bragging because I'm excited about the possibilities! :) So forgive me! I've got a fully-loaded 16700 too. Yeah scrolling through those is a bit painful. I've done

Also, it appears if you have manual control of your preset DAC’s then you can manual tune the DAC 0 to max (it sounds like you have 2040 bit DAC’s if 1019 is your center). Monitor the YIG freq.

<sound of bits chasing each other.... a lot like crickets.....> What I've found on the lower (16700 series) LA's is that the deep capture is not as useful as you'd like. 2M samples X 16 or more

I have not had to deal with freq. tune issues in an 8753, but did have to deal with them in 8566 and 8340 repairs. There are coarse adjust for both the high and low end freq. tune points measured in