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Test Equipment Anonymous (TEA) group therapy thread

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factory:

--- Quote from: dl6lr on October 21, 2021, 08:59:45 am ---
--- Quote from: mansaxel on October 20, 2021, 08:26:23 pm ---
--- Quote from: dl6lr on October 20, 2021, 05:57:15 pm ---
To make sure I have enough, I just bought another -hp- 5245L...
Have to find a way to get one of those old hp mains cables, don't want to replace the instruments plug. I know a place where there are lots of those cables, but I have currently no access, so have to get such a cable.
Any pointer?

--- End quote ---

Oh, you bought the one in Buxtehude? Congratulations.

--- End quote ---

Yes, exactly. This is comfortable to collect, however the seller hasn't responded yet.
Seems to be in better condition than the previous one. Just for curiosity I pulled A6 and A7 and tested the rectumfiers off-line to be ok, the regulator board with the crapacitors to follow.

--- End quote ---

Looking forward to seeing more pictures, here are same the pair of boards fitted to my 5243L, not much difference in the rectifier board, but regulator board has some older looking Zeners and I agree the original capacitors are long past their best, the 100uF had been replaced in the 70's & was fine (had to desolder to check).




Must have had a major failure at some point, as the pass transistors have all been replaced with these.


David

dl6lr:

--- Quote from: factory on October 21, 2021, 08:20:08 pm ---Looking forward to seeing more pictures, here are same the pair of boards fitted to my 5243L, not much difference in the rectifier board, but regulator board has some older looking Zeners and I agree the original capacitors are long past their best, the 100uF had been replaced in the 70's & was fine (had to desolder to check).

--- End quote ---

Counter is s/n 408-00459 made in England, so way older than the service manual with series 628-xxxxx. No level control on the front, only sensitivity switch.

Inside not much dirt but some signs of corrosion, especially transistor caps on board A19, A20, A21, A35 in the bottom are dull. Boards A10..A14 are the same as A15, A16, so populated all medium frequency decimal counters where low frequency decimal counters would be required only. Board A10 is populated with different transistors, so maybe replaced once.

Measured the caps on board A7 as well as C4, C6..C10 to be fine with about nominal capacitance and low ESR, so fired the counter up and had at least some signs of life (will recap later).
First digit does not come up (bad nixie AND bad board A10, detected by swappings around), not counting right. Oscillator is working and oven heating. So have to invest some time for a more sophisticated analysis. A separate thread, I guess.

xrunner:
No TEA just working on an issue with this old Sherwood RV-4050R. Might be 25 to 30 years old. I guess I've had it for 15 years. My neighbor was going to throw it away back then so I grabbed it for my own use. I only use it to play FM stations in the backyard. It sits in the house and has a long run of speaker wire (NO audiophool perfect surface silver wire here just cheap Radio shack wire) to speakers on the back porch.

It has an encoder for the volume control. I began noticing the volume would jump up to a pretty loud level for no apparent reason. When I turned the volume knob I could see the display indicator jump erratically. Problem solved by dousing the encoder with contact cleaner. Nice single-sided PCBs in that they show the traces on top with shaded lines. Only surface mount chip in the whole thing is a CXP50116 4 bit 4.2 MHz microcomputer.

As you can see, I did find the BAR CODE.

tautech:
Picked a great day to skive off kite fishing as nothing much happening here.
Caught a feed for the mate and I but nothing more.  :(

It was long overdue to have the rig see the light of day...one like this:
https://www.fishingtacklesale.co.nz/product/810164

beanflying:

--- Quote from: tautech on October 22, 2021, 09:03:18 am ---Picked a great day to skive off kite fishing as nothing much happening here.
Caught a feed for the mate and I but nothing more.  :(

It was long overdue to have the rig see the light of day...one like this:
https://www.fishingtacklesale.co.nz/product/810164


--- End quote ---

I thought all the Kiwis were out crying that the Bat failed to win bird of the year  :-DD

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