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TV Test/alignment gear on the cheap (and small)
Since I'm getting ready to start on a TV project I figured I'd ask here... what are my options for cheap and comprehensive gear needed to align sets? I'm already in possession of an oscilloscope, DMM, and analog meter, but I'm referring to the more specialty alignment stuff like sweep generators etc.
I'd like to keep it low priced and not take up a lot of space, as I don't have much room or budget, nor do I envision getting/working on lots of TVs in the near future. Maybe someday, but not now. I see much about the Sencore VA62(A) which can be had for fairly cheap, but it's not clear to me if it's an all-in-one unit that can be used to also align a set (with 21Mhz IF mod). If so... spiffy. If not... What are my options without breaking the bank or having to get a bunch of separate boxes? Are there good cheap digital sweep/marker generators (or even a DIY kit) out there? ... Under $100? ... Under $50? |
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The VA-62 is not a proper sweep/marker generator it's multiburst pattern (which you can get off a test pattern DVD) can be used for a crude "visual alignment", but I would not put much stock in it's usefulness asside from being good at testing/touching up an alignment from proper gear.
A B&K 415 (if I've got the number right) is a good easy to use all in one 45 Mhz rig. The 21MHz TV IF were on their way out in the mid 50's, so most gear that can do it is big tube stuff or expensive specialty gear. Personally, I feel unless you plan to do a TON of TV work, are a perfectionist, and or know one of your projects has extreme screwdriver drift in it's alignment, your better off not wasting your time with alignments. I've owned over 100 TVs by now and serviced a good portion of them. I've yet to do an alignment despite having the gear...I've got a few sets that could use it, but it just ain't that important.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
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Fair enough. I agree it's probably not an issue for most, my last set was untouched and didn't need anything, but this one's had some bodgery so who knows what has been done to it and whether screwdriver Pete had a go.
Main reason I was eyeing a VA62 was for its other features - ring tests and drive waveforms, which seem like they'd be useful in troubleshooting. There's a NIB one on ebay currently for $15 (though shipping on those is a bear!) Since I don't have signs of needing it for any of that yet I don't think I'll drop the $60+ on it, but if I get one locally for a good price I might still grab it for those features. ... also I'm going to start using the phrase "extreme screwdriver drift" now. Epic. |
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Go for it. lol.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
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Having worked in my dad's TV shop for 30 years, here is the list of stuff I'd get first, arranged in most useful to least:
A Mirror - get one for the back of your bench and a portable one - handy for portables and the test jig. Use it enough, and folks just don't look right unless they are reflected in a mirror.... Ours were broken back of diplay case units from the glass place, and our portable was an unbreakable one about 16x20 or so used in prisons.... DMM - we were partial to the Fluke 70 series, but the beckman 310 could measure up to 1KV. I have the Fluke 77 and Beckman 4410 Cap ESR meter - if not servicing solid state stuff, move on. I have the Anatek/Bob Parker unit and a Sencore LC102 HV Probe - Get a Pomona (EDIT: model 2900) standalone with the integral analog meter. The optional fluke job is too bulky. Scope - Anything beyond 20MHz is overkill for most TV repair. I have 3 - the Hitachi V212 daily driver, a Kikusui COS6100M and a Sencore SC61 CRT checker - B&K units made money for us - started out with the 440, and ended after 30 years with (4) 470s - one was a parts unit. We had all but one adapter - but used only 3 for most checks - delta/socket 3, and two different inline ones - one for the Asian stuff and one for the A63-series stuff. I've used the CR70 from Sencore at their sales seminars - it rejuv's just as good as any. Folks like the universal adapter, but B&K made one as well. Ringer - I use my VA62 or LC102. Convergence/Color Bar Generator - we used RCA stuff - WR504/ Wr-508. Skip the tube stuff. Leader also makes a good one - not sure of the model, but smallish and steady unit. Degaussing coil - make your own with a momentary switch (rated at least 5A "inductive" - most 10A/125VAC switches will switc 5A inductive loads..). We had two - both were GC hard-plastic encased units, and we added 8' more cord, as outlets are sometimes scarce. Hobby Electronics magazines in the late 60s had plans - check with American Radio History. Dedicated transistor tester - we started out with an octopus/Eico 460 setup, and ended up with a Cricket - handy for checking stuff quickly, albeit 90% of checks were PN junction checks with a Fluke. All-in-one unit - We used them all - B&K 1076/1077 and both the VA48 and VA62. Handy for supplying missing bias, sweeping yokes and flys, and providing a sweep signal so we could "walk the IFs" with a scope. Most handy in supplying a known-good color signal to trace color problems, albeit about 90% solid state stuff (hint: always the jungle chip, crystal, or resonator...) Substitution cap - take a big ol' 80uf/450V and put some clip leads on it - handy for finding open caps that cause 60 or 120Hz "crawl" A good outdoor antenna - not everyone has cable, so you gotta check more than channel 3 or 4.... Alignments were RARE. I know of 2 we did in 30 years - one on a Sharp solid state set (open IF can, had to realign, used VA48) and a APC/ACC Color alignment on a GE tube set, IIRC. Easy, two coil alignment. A new crystal got us color back, but the phase was out slightly, yielding green hue at center of the tint control. A good computer loaded with service info - for PDFs (we had 66 Gigs of manuals on PDF, mostly Hitachi, RCA, and LG/Zenith.), Parts Finder, Sony DAS, RCA Chipper Check, Zenith Z-tips (dos only...), and two stand-alone tip products we contributed to - 64,000 TV/VCR/Monitor tips at the beginning, not sure of after many updates... And then the consumables - cleaners (we used Windex, Fantastic!, and Olde English wood cleaner) Solvents - 91% IPA for flux and flushing switches, Acetone for degreasing, and Naptha for petroleum-based cleaning. In earlier times 1,1,1 Trichloroethane and a Rawn-chemicals HCFC product like 1,1,1,. Lots of acid brushes, RTV sealant, Heat Sink compound (Dow-Corning, not the GC or Chemtronics stuff.) Dad was a WD-40 FANATIC. We had the gallon can and the little spray cans. Freez-mist from Rawn - a 20 spray Oz can would last a month or so. I've probably missed alot, and others, feel free to add/admonish.....
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Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! Last edited by Findm-Keepm; 06-03-2017 at 05:32 PM. |
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Two additions:
VTVM - Only one way to go, the RCA/Viz Senior or Master VoltOhmist. We also had a nice Zenith Ultrasonic and IR remote tester. It had added features for measuring drive on the System 3 sets, but 90% used for IR remote control testing. I know of only one other way to test ultrasonic remotes sans the TV...the Zenith tester paid for itself over and over. Hard to find, I still have ours. It just uses an ultrasonic mic, and overdrives an op amp to square up things before sending it to both an LED and a scope jack. The iR side sends the IR diode/receiver output along a similar path. Overkill for a newbie, but it completes my lineup
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Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! |
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Downconvert B&K 415 45MHz to 21MHz
Take a look at this thread:
http://videokarma.org/showthread.php?t=268392 I was able to use a mixer to heterodyne the B&K 415 45Mhz sweep output down to 25.75 Mhz low band IF frequency. Feed the B&K 415 IF output into the mixer, add a sine wave of the needed frequency, and out comes the low band IF frequency sweep. I used an Analog Discovery II to show the flatness of the sweep, but you only need a regular o-scope for the B&K alignment process. Dave |
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My big mirror was part of a scrap heap from a home remodeling. Last time I did a setup was before I had the mirror; bruised my arm up quite a bit as I recall from looking around front with one hand in the back. |
Audiokarma |
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I musta carried that unbreakable mirror on 500 service calls. Dad behind the set, me acting as an easel. I could follow his gaze and know just where to aim the mirror. Dad carried two caddies - one with parts and tubes, and the other with tools and test equipment. One Xcelite P8(Pocket "8" / 1/4" hex nutdriver, not to be confused with Motorola's "Flat 8"..) in his pants pocket and an Xcelite R183 (sans the pocket clip - shock hazard...) in his shirt pocket along with one of those fantastic PTS Gray Diddle sticks. Between the three, 99% of sets could be opened, adjusted, tested for Horiz Drive, or knocked around to find an intermittent... Not to hijack the thread. OP/Vintage PC: Be sure to check out the mid-60's January and December issues of Radio Electronics. Huge Color TV and general TV focus in those issues, with lots of good info. I prefer to use the search function at ARH ( http://www.americanradiohistory.com/...IDX/search.cgi )to find specifics, as I have most of those issues, courtesy of Dad. EDIT: Bob Andersen has extensive experience aligning IFs - see his many posts for some insight.
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Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! Last edited by Findm-Keepm; 06-07-2017 at 10:16 AM. |
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Quote:
Edit - there is an INCOMPLETE one on eBay, useless without all the cables and pads.......not a good beginner project to have to make all those items...
__________________
Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! |
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Neat, but not particularly useful for my current 21mhz IF set.
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Another Good Thing To Have...
is a variac. And maybe an isolation transformer.
Some variacs have isolation built-in. There are times when you want to slowly bring up a set particularly if you don't know much about it or if it has been sitting awhile.
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#15
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Then a VA62 with the EPROM mod is called for - the older tube alignment generators probably would work, but a VA62 can come cheap if it's local pickup. Around here, they have all migrated out of the area. I've not seen one locally on CL or eBay since 2010 or so - my eBay saved searches all yield >500mi away listings, and only Goodwill has had one close, but it was a basket case, missing knobs.
__________________
Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! |
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