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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Tektronix 2246
Traces and readout intensity are sometime very brighter than usual.
When this occurs two out of four neon bulbs located in HV "module" flashes. These two bulbs are connected at pins 2 & 3 of CRT. I'm also looking for the tech manual. Any ideas? Thks, Daniel |
#2
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Tektronix 2246
You'll have to wait until Jim Yanik comes around for comfiration, but I
suspect the CRT. Actually, that is not bad luck, IIRC there are some very hard to get ICs for Tektronix scopes. Think it was the horizontal amp. Your problem has nothing to do with that, so hopefully either you have ICs for another scope or can find a CRT for yours. Once sure of the problem, ESI in Cleveland OH has alot of Tek stuff. You might try Skycraft in Orlando FL but they don't have as much, or didn't last time I was there. Other than that there is always eBay. There are other places, I just don't know of them. Good luck with it. JURB |
#3
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Tektronix 2246
Thanks for reply. Glad to hear about availability of TEK CRT's. In the
meantime of Jim advice's I'll use my 2213. Not the same feeling, definitively. Daniel |
#4
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Tektronix 2246
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#6
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Tektronix 2246
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#7
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Tektronix 2246
Jim Yanik wrote: wrote in ups.com: Thanks for reply. Glad to hear about availability of TEK CRT's. In the meantime of Jim advice's I'll use my 2213. Not the same feeling, definitively. Daniel I have a 2213,too. Nice scope,built it myself,from boards and parts other techs didn't fix. [plus a few purchased parts to complete the job,and a FREE non-salable CRT thanks to Vern Isaacs who ran CRT manufacturing at TEK.] That reminds me of the old Johnny Cash song, "I got it one piece at a time". ;-) http://www.cowboylyrics.com/lyrics/cash-johnny/one-piece-at-a-time-2214.html -- HELP! My sig file has escaped! ;-) |
#8
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Tektronix 2246
"Michael A. Terrell" wrote in
: Jim Yanik wrote: wrote in ups.com: Thanks for reply. Glad to hear about availability of TEK CRT's. In the meantime of Jim advice's I'll use my 2213. Not the same feeling, definitively. Daniel I have a 2213,too. Nice scope,built it myself,from boards and parts other techs didn't fix. [plus a few purchased parts to complete the job,and a FREE non-salable CRT thanks to Vern Isaacs who ran CRT manufacturing at TEK.] That reminds me of the old Johnny Cash song, "I got it one piece at a time". ;-) http://www.cowboylyrics.com/lyrics/c...at-a-time-2214 .html The first TEK scope I built from old boards was a 5 Mhz 221 mini-scope,but it had problems in the 4 layer PCBs,I had to jumper too many runs,so I traded it for boards for my 2213. It's CRT was too small for much use,anyways. -- Jim Yanik jyanik at kua.net |
#9
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Tektronix 2246
Jim Yanik writes:
The first TEK scope I built from old boards was a 5 Mhz 221 mini-scope,but it had problems in the 4 layer PCBs,I had to jumper too many runs,so I traded it for boards for my 2213. It's CRT was too small for much use,anyways. What's the next model, the 321? I still have one of those that more or less works (or at least it did the last time I tried it a couple years ago). Some of the design of that is strange. I have to power cycle mine a few times before the trace appears, and only at full brightness. I think I concluded it was fault in the CRT because everything else checked out. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#10
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Tektronix 2246
Sam Goldwasser wrote in
: Jim Yanik writes: The first TEK scope I built from old boards was a 5 Mhz 221 mini-scope,but it had problems in the 4 layer PCBs,I had to jumper too many runs,so I traded it for boards for my 2213. It's CRT was too small for much use,anyways. What's the next model, the 321? An entirely different class. The 200 series were a group of handheld,battery-powered scopes with really small CRTs. The 300 series (after the 321) were from Sony-TEK. The 321 was first sold in 1960,BTW.It was TEK's first solid-state scope(and also battery-powered). The 211,the first 200 series scope,came into being in 1972. I still have one of those that more or less works (or at least it did the last time I tried it a couple years ago). Some of the design of that is strange. I have to power cycle mine a few times before the trace appears, and only at full brightness. I think I concluded it was fault in the CRT because everything else checked out. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. -- Jim Yanik jyanik at kua.net |
#11
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Tektronix 2246
I recommend you check for a couple of failure possibilities: First: DC restorer diodes might be damaged, as Jim says. If ok, check for cold solder joints near insity pot (cracked due to mechanical stess, cold solder, etc.9. If ok: I suspect CRT (had this 3 times), but CRT seldom fails to my experience in the 2213/2215 sereis scopes. hth, Andreas |
#12
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Tektronix 2246
The 221 etc. series scopes still run fine nowadays. You need a calm
hand and a lot of experience to keep them healthy. But in the end, for using in field service at a customer site, I like these small scopes. The BW is low (0.5 up to 1 MHz, depending on model). But most times enough for the things I have to do in field: get a quick impression of where the fault is, these scopes are real helpful. The battery and the plastic molded case gives my most time problems when I get these units for repair. Personally, the 213 with the integrated DMM is what I enjoy most. It's a good combination, and still useful in 99% of my service work. If you take a little bit of care, and handle these analog scopes well, they last real long. Andreas |
#13
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Tektronix 2246
"Andreas Tekman" wrote in
ups.com: The 221 etc. series scopes still run fine nowadays. You need a calm hand and a lot of experience to keep them healthy. But in the end, for using in field service at a customer site, I like these small scopes. The BW is low (0.5 up to 1 MHz, depending on model). 221 was 5 Mhz, 213=1 Mhz, 211-212-214=500 Khz But most times enough for the things I have to do in field: get a quick impression of where the fault is, these scopes are real helpful. The battery and the plastic molded case gives my most time problems when I get these units for repair. Personally, the 213 with the integrated DMM is what I enjoy most. It's a good combination, and still useful in 99% of my service work. If you take a little bit of care, and handle these analog scopes well, they last real long. The plastic pins in both case halves are important,they retain the circuit board's position,keeps the interconnect pins from spreading the receptacles open and the tiny leaf spring from falling out and shorting things.They caused a few meltdowns,with those NiCds. Andreas 213 and 221 were the best of the 200 series. -- Jim Yanik jyanik at kua.net |
#14
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Tektronix 2246
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