Tektronix 7603 - Page 1
Forum section: electronics / repair

author: BaileyAV
author_rank: Contributor
timestamp: December 05, 2015, 04:58:07 am
content: I received a tektronix 7603 yesterday from america (i live in australia) and the shipping was so poor that some of the dials were pushed in and broken. i have attached photos of the damage and the circuit board that has been affected.the company that sold is it offering me a $50 refund for the damage so i was wondering if i can get a replacement circuit board/face and fix it for a decent amount of money.Thanks.

author: BaileyAV
author_rank: Contributor
timestamp: December 05, 2015, 06:42:17 am
content: also, if its too hard to find the part id appreciate being told so i can push for a full refund.

author: miguelvp
author_rank: Super Contributor
timestamp: December 05, 2015, 06:51:57 am
content: Look here of the part numbers:http://w140.com/tekwiki/wiki/7603http://w140.com/tekwiki/wiki/7D01For completion but you don't seem to have damage on this:http://w140.com/tekwiki/wiki/DF1and check here if they offer spares:http://www.qservice.tv/tek_spares8.htmEdit: About the circuit board, what is the damage in there? is that the screen circuit board? or the logic analyzer one?

author: BaileyAV
author_rank: Contributor
timestamp: December 05, 2015, 07:02:22 am
content: i appreciate the page but thats mainly cosmetic knob replacements..the metal knobs i have are actually bent i would like to replace the entire thing

author: miguelvp
author_rank: Super Contributor
timestamp: December 05, 2015, 07:32:14 am
content: At least the manuals will tell you the part number for the other pieces so you can find them if available.

author: BaileyAV
author_rank: Contributor
timestamp: December 05, 2015, 07:50:28 am
content: gotcha!seems like a special order peice that going to cost me almost as much as the scope did

author: miguelvp
author_rank: Super Contributor
timestamp: December 05, 2015, 08:17:32 am
content: Well if you can't use it and the seller doesn't want it back. I do collect 7000 plug-ins. Maybe if you want to get rid of the 7D01 and the DF1 I will find them a good home either here (bottom one):or here:Of course if the price is right

author: BaileyAV
author_rank: Contributor
timestamp: December 05, 2015, 08:36:36 am
content: i have never intended to use those plugins anyway - ive got others on order.one of the knobs was cracked and the outer length of it is slightly bent. apart from that there is no damage i can see and if i end up having this scope you most certainly can have it. ill let you name the price as long as its not a completely one sided affair

author: miguelvp
author_rank: Super Contributor
timestamp: December 05, 2015, 09:27:11 am
content: PM sent.

author: BaileyAV
author_rank: Contributor
timestamp: December 05, 2015, 12:22:23 pm
content: im a little confused here -ive attached a screenshot of the manual and circled both parts that i need to replace because of the bent shafts.it lists them as the same part number but they are very clearly different peices - even in the manual you can see the difference.what is the go in situations like this???

author: tooki
author_rank: Super Contributor
timestamp: December 05, 2015, 01:41:50 pm
content: I'd insist on a refund and leave poor feedback. Otherwise they won't learn to pack things properly, which is, frankly, the absolute basics of online sales.

author: tautech
author_rank: Super Contributor
timestamp: December 05, 2015, 06:19:14 pm
content: Some Docs and links that might help:https://www.eevblog.com/forum/repair/repair-documents-and-links-sticky-me-please-mods/msg477909/#msg477909Sphere have lots of stuff and a section with additional reference material fo X reference.

author: BaileyAV
author_rank: Contributor
timestamp: December 05, 2015, 09:44:40 pm
content: Quote from: tooki on December 05, 2015, 01:41:50 pmThe second photo - the one where you can see the packing peanuts around the scope - is exactly how the unit was when i took off the cover for the box (in fact it was simply one box put on upside down over another and then taped together) ive never been more appalled.im going to fight for the refund regardless i think.

author: dom0
author_rank: Super Contributor
timestamp: December 05, 2015, 10:32:20 pm
content: Quote from: BaileyAV on December 05, 2015, 12:22:23 pmThe replaceable parts list usually have a few errors.

author: miguelvp
author_rank: Super Contributor
timestamp: December 05, 2015, 11:29:05 pm
content: I think the 33 is must the screw part not the actual piece you highlighted since that's from the mechanical section of the manual.On page 158 of the following pdf file you can see the Calibrator and Mode switches circuit board with the parts you highlighted (at least I think that's the one) with the part numbers on page 140.http://www.ko4bb.com/manuals/205.178.121.21/Tektronix_7603_Service_Nov1977-hi-res.pdf

author: BaileyAV
author_rank: Contributor
timestamp: December 06, 2015, 12:17:48 am
content: i have attached photos highlighting what i am after. they dont actually appear on the diagram you posted even though one of the switches plugs into it.

author: miguelvp
author_rank: Super Contributor
timestamp: December 06, 2015, 12:35:39 am
content: Oh I see, hmm it only says variable resistor, but I can see one of the ones on your pictures have some values on themI've even looked at the 7613 manual and it has 3 of them, no part number.

author: miguelvp
author_rank: Super Contributor
timestamp: December 06, 2015, 12:52:40 am
content: I'll try to find it, but maybe it's in here:http://www.qservice.tv/tek_spares3.htmIs there a part number on the actual component?

author: miguelvp
author_rank: Super Contributor
timestamp: December 06, 2015, 01:43:20 am
content: Another source for pots, this place is linked on tautech's posthttp://www.sphere.bc.ca/test/tek-parts/tekpots.htmlBut if you could look at the part number on the pots (should start with 311-) that would help a lot to be able to find them.

author: BaileyAV
author_rank: Contributor
timestamp: December 06, 2015, 02:08:06 am
content: i have to go buy some tiny allen keys to get the pots off my standard kits arent small enough.in the meantime - the CRT was also damaged in the shipping - photo attached.This isnt in the visible area but should i look at getting a new CRT?

author: tautech
author_rank: Super Contributor
timestamp: December 06, 2015, 02:15:04 am
content: Quote from: BaileyAV on December 06, 2015, 02:08:06 amShit, thats terrible packing.It's not the visible damage I'd worry about but what it may have done to the internals of the CRT with a impact like this.

author: BaileyAV
author_rank: Contributor
timestamp: December 06, 2015, 02:41:07 am
content: so the best bet would be to turn it on and see if i can display a trace properly?ive been worried about turning it on in case i do - it goes bang and it somehow negates my being able to get a refund

author: miguelvp
author_rank: Super Contributor
timestamp: December 06, 2015, 02:42:52 am
content: Sorry to hear the bad newsBtw I did find the graticule part number 311-1055-00This site is sold out but has a picturehttp://www.sphere.bc.ca/test/tek-parts/tekpots.htmlNow I'm chasing R1028 (readout/intensity) on the parts but can't find it.

author: dave_k
author_rank: Frequent Contributor
timestamp: December 06, 2015, 02:46:11 am
content: Aww man .. that packing sucksWhere are you in Aus BaileyAV?

author: tautech
author_rank: Super Contributor
timestamp: December 06, 2015, 02:51:40 am
content: Quote from: BaileyAV on December 06, 2015, 02:41:07 amSend pics to the seller and show him the damage, then after checking with him power it up.CRO's are never straight forward to ship, they are easily damaged.I've fixed a few and onsold them ALWAYS insisting pickup only.Good luck, fingers x'ed for you.

author: BaileyAV
author_rank: Contributor
timestamp: December 06, 2015, 02:53:00 am
content: Dave - im in Perth.miguel i really appreciate all the help you are giving me - im only just getting into a bit of electronics design and this is the first peice of test equipment ive purchased so im not used to going through massive manuals like the tek one to find what i need.

author: Addicted2AnalogTek
author_rank: Frequent Contributor
timestamp: December 06, 2015, 02:57:25 am
content: Would the seller happen to have been "maggi-****"I recently bought a 465 from them which was also poorly packaged. the vertical knobs got crushed and one of the var shafts/coupler snapped in half. If that is who the seller was, it appears they did not learn their lesson when I 'informed' them that they damaged the scope via horrible packing.I've bought several CROs on ebay, and as long as the front of the scope has several layers of thick bubble wrap taped over it - or the actual plastic cover for 400 series Tek scopes - they arrive fine. sometimes the plastic cover gets cracked, but oh well.

author: BaileyAV
author_rank: Contributor
timestamp: December 06, 2015, 03:07:54 am
content: no this was from "electronics cafe"to have a moron in shipping is one thing but provided that the outcome of this is acceptable i wont provide any negative feedback however if they try stooge me then of course it will be scathing

author: dave_k
author_rank: Frequent Contributor
timestamp: December 06, 2015, 03:20:29 am
content: I have just started restoring some 7603 and 7613 'scopes and have started compiling a spreadsheet version of the parts lists in Excel, which will let me type in a serial number and change the parts list to reflect what *should* be in the current scope I am working on. There were many revisions during the course of its production run!

author: miguelvp
author_rank: Super Contributor
timestamp: December 06, 2015, 03:21:35 am
content: Quote from: miguelvp on December 06, 2015, 02:42:52 amFound a source for the graticule/beam finder:http://www.qservice.tv/vpasp/shopexd.asp?id=4260&bc=noEdit: no cables attached but you have the cable already.R1028 on the manual is totally eluding me, but the one you have should have the part number.

author: miguelvp
author_rank: Super Contributor
timestamp: December 06, 2015, 03:31:28 am
content: Quote from: dave_k on December 06, 2015, 03:20:29 amDo you know the part number for the readout/intensity pot? R1028 on the 7603The service manual doesn't list it anywhere that I can tell.

author: miguelvp
author_rank: Super Contributor
timestamp: December 06, 2015, 03:41:45 am
content: Quote from: miguelvp on December 06, 2015, 03:21:35 amThat's not an 8, it's a B!!!!Part number is 311-1404-00 for the readout/intensity variable resistor pot.Can't find stock anywhere for that parthttp://www.qservice.eu/shopexd.asp?id=10493http://www.sphere.bc.ca/test/tek-parts/tekpots.html

author: dave_k
author_rank: Frequent Contributor
timestamp: December 06, 2015, 03:51:46 am
content: Yep you found it .. R102B. The other half of that control is shown on the Logic board schematic

author: BaileyAV
author_rank: Contributor
timestamp: December 06, 2015, 03:58:43 am
content: sphere have a rackmount 7603 in stock from what i gather on the website. im going to see if i can get lucky and get them to strip it for parts

author: miguelvp
author_rank: Super Contributor
timestamp: December 06, 2015, 04:04:25 am
content: Alternate part number from allen bradley is 10m901 but no luck what that one either.

author: TerraHertz
author_rank: Super Contributor
timestamp: December 06, 2015, 08:27:38 am
content: With that damage, especially the cracked CRT face (it's a writeoff, even if it still has vacuum) I'd be concentrating on demanding a full refund, including what you paid for shipping. You have photos demonstrating serious unrepairable damage due to completely inadequate packing. One layer of bubble wrap and some styro-peanuts does NOT cut it. The peanuts *always* flow around, leaving some side of the item up against the inside of the box.It's the seller's fault, make them pay for return shipping if they want that wreck back.Or alternatively, did you pay for shipping insurance? Claim it.Leave deciding what to do with the scope, until the refund is in your pocket and it's settled whether you get to keep the scope. Only reason you should be opening it up is to take photos of the internal damage.But do try to keep it, as a spare parts unit.I collect 7000 series scopes and plugins too. I'd be really pissed with the seller about that. It's just negligence and stupidity. I've had a few similar shipping damages, always due to poor packing. In my early days of ebay buying I'd be polite about it, but not any more. Make noise! Teach the slackers a lesson.Btw, which carrier were you using? I find TNT very good and haven't had a single damaged item with them. Even stuff that was very badly packed (exposed carry handle on a vintage logic analyzer!) got here from USA undamaged thanks to their careful handling.Edit: Ebay seller electronicscafe is pretty high volume, they have about a 0.67% negative rating for the last six months, and they do (claim to) give full refunds sometimes. But check their time limit for claims.http://feedback.ebay.com.au/ws/eBayISAPI.dll?ViewFeedback2&userid=electronicscafe&iid=-1&de=off&items=25&which=negative&interval=180&_trkparms=negative_180

author: BaileyAV
author_rank: Contributor
timestamp: December 06, 2015, 09:28:22 am
content: at the end of the day i paid with paypal so if i really have to ill just file a claim through there.i have no idea what carrier they used - i got home from work one day and it was sitting at my door! there are no shipping stickers or anything else either. only thing is an ebay sticker on the boxi am well within the time frame for refunds - they give 2 weeks i believe and i made the claim the day i received it.

author: MarkL
author_rank: Unknown
timestamp: December 08, 2015, 06:32:17 pm
content: If it still has a vacuum, that CRT is an implosion waiting to happen.I'd be REALLY careful around it. Especially since it looks like you've removed the plastic filter from the front. It's supposed to protect from flying glass.

author: Deathwish
author_rank: Unknown
timestamp: December 08, 2015, 06:42:17 pm
content: Quote from: MarkL on December 08, 2015, 06:32:17 pmYep, I would not even switch the unit on to test the crt.

author: dom0
author_rank: Super Contributor
timestamp: December 08, 2015, 06:48:26 pm
content: Quote from: Deathwish on December 08, 2015, 06:42:17 pmCurious: Is an imploding CRT in some way worse when it's heater / anode are biased?

author: SeanB
author_rank: Super Contributor
timestamp: December 08, 2015, 07:27:46 pm
content: No, the explosion is just as bad, but now you will have a nice hot arc as the power supply trips out, and hot glass exploding out where before it was room temperature. At least the damage is on the edges, so the CRT will just lose vacuum, rather than shattering. Larger CRT units have the tension band around them so that they do not implode out too badly when damaged, the band keeps the whole front glass in compression so cracks do not propagate through it. Tek just used a flat glass thick enough to not bow, as they needed the linearity which a regular CRT does not have without serious correction. It can implode.

author: miguelvp
author_rank: Super Contributor
timestamp: December 11, 2015, 12:26:55 am
content: Bump just to make sure the OP is ok, since we haven't heard from him after the potential implosion warning.

author: BaileyAV
author_rank: Contributor
timestamp: December 11, 2015, 09:18:30 am
content: sorry ive been busy with work lately.electronics cafe gave me a full refund and simply gave me a return authority to ship it back.I never turned it on or anything like that i wasnt game enough and i was concerned that if i turned it on and the glass blew up they would refuse the refund saying it was my fault.i have purchased another 7603 so now i have to see what condition that comes in when it finally arrives.thanks for the help everyone - i may need it again haha

author: vk6zgo
author_rank: Super Contributor
timestamp: December 11, 2015, 09:49:55 am
content: Before we all get too overwrought about this----- Oscilloscope tubes are quite small,compared to even the smallest TV display tubes & are consequently much less stressed.In 40+years in Electronics,I have yet to hear of one instance of normal CRO tubes imploding,let alone causing injury.Some of the very large WW2 Radar display CRTs however,were very much more hazardous.The very early TV display tubes were very similar,hence had a piece of safety Glass in front of them.Later designs of TV CRTs did not need these due their construction asSeanBpoints out.