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| Test Equipment Anonymous (TEA) group therapy thread |
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| Robert763:
--- Quote from: bd139 on July 19, 2022, 11:34:03 am ---Oh look some TE content :-DD Ok Tek 465B update. Couldn't resist it and have some dead time to burn. Literally burn today. Eish. So stripped down the 465B and decided to test the pin that was controlling the faulty address line to make sure that it wasn't being shorted to something other than the 5V rail before stuffing a new chip in it. Tested fine. Looks like the chip was a random failure of some sort. I will see if I can crack open the cerdip and have a look at some point at what happened but I lack a suitable vice and microscope (at the moment :-DD). To do this, I slipped the leg off something else into the hole and clipped it with the Keysight micrograbbers. They are quite good. Fluke 75 because, well it was already on the desk. After I was happy I probably wasn't going to blow the investment up immediately, in it went: The entire unit channel switching was retested and all is good :-+ Showcase shot of course of both working 465's connected to the DG811. They have been put away as they suck up 90W and it's too fucking hot to run them for more than that. Not visible too well from the picture is the 465B is super crisp compared to the 465. Once I get my probe situation sorted I will check the power supply out on the 465. It may need some filter caps. I have a plan for a new way to solve the capacitor problems in these scopes which I will detail shortly. It involves a simple "module" on one PCB. No individual adapter boards! Remaining issues are the CH1 attenuator knob on the 465B is on the wrong location clearly because I was drunk when I cleaned it. The slope switch on the 465 delay timebase is broken and they both need new feet. I will sort those issues out when I've moved. Now I'm going to sit in front of the fan with a pot noodle and beer like a chav :-DD Payment has been sent to the seller as discussed with them on iMessage. Always good to foster good business relations because I'm probably going to need them in the future and I'm sure they need reliable customers too. --- End quote --- Power lamp is out on the 465 too ;D Do you want a lead pouch for the 465? I received a random one in a package. You are welcome to up for poatage of pick-up meet. |
| 25 CPS:
--- Quote from: med6753 on July 19, 2022, 04:49:24 pm ---Finally got all the new caps installed on the 465B. I shot myself in the foot on this project. I got too over zealous in pulling the old cans and I damaged several pads on the circuit board. The result was several open circuits which I had to carefully trace and ohm out and repair. I believe I fixed them all. But before I install the trigger board I'm going to apply power and make sure all voltages are present. I like Chris' idea of an auxiliary board to mount the new caps rather than the individual adapters. But you still have to unsolder and remove the old cans and that's where I did the damage. Oh well. This is the last of my 400 series scopes that needed a re-cap anyway. Baby it's hot out there. Nice and cool in here. That 77 F is not accurate. That unit is by an outside wall and the radiant heat is affecting it's reading. Bench area and living room is 75 F. Bedroom is 72 F. Can't wait to see my electric bill. :scared: --- End quote --- Those Lacrosse thermometers are great. Canadian Tire sells them here. I bought a second one and realized that the specs on the transmitter were the same from the details on the regulatory label and sure enough, both thermometers received data from the transmitter that came with the first one which I mounted on a fence under a tall shrub in the back yard so it'd be in the shade. I've got several in different rooms now all being fed from the same transmitter. I don't have any pictures of this but I went hunting with a spectrum analyzer and found the transmitter sent data only very intermittently. What I thought was the weather station transmitter at first turned out to be the TPMS sensors on the truck in the driveway. I'm not looking forward to the hydro bill either. It's going to come down to a question of a day or two where the billing period ends if I go past the 600 kWh Tier 1 limit from all the air conditioning due to having to sleep during the day. |
| bd139:
--- Quote from: Robert763 on July 19, 2022, 05:12:20 pm ---Power lamp is out on the 465 too ;D Do you want a lead pouch for the 465? I received a random one in a package. You are welcome to up for poatage of pick-up meet. --- End quote --- Doesn’t have a power light. Has a low line light only. |
| Robert763:
--- Quote from: bd139 on July 19, 2022, 05:18:33 pm --- --- Quote from: Robert763 on July 19, 2022, 05:12:20 pm ---Power lamp is out on the 465 too ;D Do you want a lead pouch for the 465? I received a random one in a package. You are welcome to up for poatage of pick-up meet. --- End quote --- Doesn’t have a power light. Has a low line light only. --- End quote --- You learn something everyday :) I only ever used the B model |
| bd139:
--- Quote from: Robert763 on July 19, 2022, 05:24:38 pm --- --- Quote from: bd139 on July 19, 2022, 05:18:33 pm --- --- Quote from: Robert763 on July 19, 2022, 05:12:20 pm ---Power lamp is out on the 465 too ;D Do you want a lead pouch for the 465? I received a random one in a package. You are welcome to up for poatage of pick-up meet. --- End quote --- Doesn’t have a power light. Has a low line light only. --- End quote --- You learn something everyday :) I only ever used the B model --- End quote --- If it’s any consolation I find it terribly disconcerting because you don’t know if the power supply is about to explode or not the moment you turn it on like the 465B which will not light if there’s a short. |
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