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Sounds to me like the crystal oscillator is feeding a shorted input. -Chuck Harris John wrote:

Agreed and thank you for pointing that out. I will not be using the "LS" variant as replacements then. However, the 74HCT112 seems to be rated at 66MHz at a Vcc of 5V?

Makes sense to look at the rated speeds. Tek picked the S type for a reason, and it is clock speed. If the oscillator is replaced, the original part numbers would work as designed, as they did for the

Raymond, Contacted you through MP. Leo

The 74HCT112 is only guaranteed for 24MHz clock. The 74S112 is rated for 80MHz minimum. The 74F112 is rated for 100MHz min.

Thanks for the info! I've seen a couple versions of the TM503 too, even what looked like a TM5003 of sorts with no markings or real part number, it appeared to be a part of a 'pre-built' unit that was

John, 540uF and 390uF sound like 'preferred values' as in resistor values. As far as I know there is no reason for any great precision on the values of reservoir and smoothing capacitors, too small

tgerbic, ok, I think I get this now. There are only 4 actual pins, but their positions are mapped onto a 14 pin DIL package? So far corners would be 1, 7, 8 and 14 as indicated? You are correct that

Comments Interleaved: Pretty much have to be.? The monitor is pretty much a standard VGA monitor (I'd think) and needs the usual assortment of HV section, Horizontal and Vertical drivers (for the

I don't have a 2235 manual on hand but this sounds very similar to my case with the T948 main inverter transformer (120-1348-03) used in the 2213A that had failed, in my case on a scope I fixed about

Hi Leo, I have a 2215 wreck (very incomplete) with a transformer, will have to check. I also have a 2235 with a defective primary switcher. Never tried to repair. Contact me if interested. Raymond

Harvey is the BEST!!! I need him to download his brain and email me a copy of it! Thanks Harvey for helping everyone here!!!

Hi all, I am fighting with a 2235 PS. I previously repaired several 2213 and 2215A's, and it "always" was the primary switcher, but this time.... I removed the Power FET to apply a external 43VDC to

Personally I'd use neutral cure silicone. Hot glue gun glue is a pain to remove when you need to.

...Also what do you recommend to glue the electrolytics to each other and/or the board. They currently are mostly stuck; do I use hot glue or silicone and if so which grade is suitable?

Thanks again Harvey. I took the scope apart and pulled out the display module. Praise be, it's through hole components! It also appears that the HV section and horizontal deflection parts are all on

On Mon, Sep 21, 2020 at 08:31 AM, tgerbic wrote: > > The info in the datasheet is probably not clear because "you should not need > to know this". Based on looking at this and other family datasheets

Hi Charlie, I tried running SPC but it looks like the Acquisition board I have purchased is faulty. SPC fails and channels 3 and 4 are unstable beyond 2.5GS/s. I might re-visit the original Acq. board

Raymond, The info in the datasheet is probably not clear because "you should not need to know this". Based on looking at this and other family datasheets it seems as if the difference between the W