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#1
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1970s Zenith All-in-one Stereo with record player issues
Hello everyone today I brought home a 1970s vintage Zenith AM/FM Stereo/Phono Table top Radio that also has Tape hookups on the back, and anyways its got a Zenith Badged BSR 3 Speed Turntable in it that for some reason the size adjustment switch (the switch that tells the tone arm which size of record is on the record player for the correct tonearm drop when using the changer) isn't working right, for some reason whenever you try to use the changer the tonearm drops at the 7" position even in spite of the size switch being set to 12" size which I've got the turntable out of the cabinet and I've looked it over and I really can't figure out why the turntable won't drop the tone arm at the right spot in reference to where the tonearm position switch is set. Anyone else on here have a similar issue with one of these old BSR Changers and if so what did you do to fix it?
Thanks for your Help. |
#2
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Seriously? No one's had this issue before?
Considering how problematic these later BSR Changers were I'd be surprised if anyone on here didn't have any issues with them if they've ever had a stereo with one in it, because I know for a fact that every single stereo I've ever encountered that had one of these old late model BSR Changers in them all had issues with them of some sort whether it was the power switch being stuck in the off position, a mistracking tonearm, or a malfunctioning changer mechanism, and even a malfunctioning tonearm drop mechanism (which is what I'm experiencing right now with this old Zenith). Anyways it would be really nice if someone would give me some ideas of where to start looking and or troubleshooting as far as fixing this changer's issues goes. |
#3
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most changer issues are caused by old hardened grease, making the parts stick or not move at all. I have 50+ changers, only 2 worked right (without tear-down and cleaning) when I got them. On most changers you cant clean them effectively without some dissassembly.
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#4
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He's right, 90% of the time it's grease that turns to glue on record players, or the
grease picks up dirt and gets too gummy. BSR's are pretty easy, simple mechanism. You just gotta turn it by hand through it's automatic functions and watch it. But a good cleaning is first step. . .
__________________
Yes you can call me "Squirrel boy" |
#5
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there should be a part associated with the rotation of the tonearm that has 3 steps or stops on it to stop the motion of the tonearm swing at one of the 3 record sizes. this part should move when you move the size control. make sure all the parts associated with that are moving free. on many changers there is a friction clutch action on the tonearm movement, to prevent damage if something or someone obstruct the motion of the tonearm during the change cycle. don't get grease on that or the tonearm wont move.
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Audiokarma |
#6
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Quote:
Clean the pathways in the cam gear with a good degreaser - Naptha works well, as does WD-40. After cleaning and degreasing, use GC Phonolube or a similar grease (I'd stay away from lithium grease, it reacts with the porous potmetal) and cycle the changer with some 45s to make sure it lands properly, then some LPs. The landing can be slightly adjusted with a screw at the tonearm base. We used a GC record changer stand to repair the changers - they are pricey these days - last one sold for over a hundred on fleabay. Cheers,
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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! |
#7
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Thanks for all the tips and advice, I'll see if I can tear this thing apart and relube this thing.
one other thing I've noticed is that the record player when it gets to the end of the record it acts like its going to do the record ending cycle where it picks up the tone arm at the end of the record and sets it down on the tonearm rest and shuts off the record player, except instead of setting down the tonearm on the rest and shutting off the record player it cycles the tonearm back onto the record and plays the record again, almost like as if the record changer's support arm was up and it still had another record on the changer but it doesn't, and even with the support arm lifted up and out of the way it still does the continous cycle thing with the tonearm. any ideas as to why it would all of the sudden start doing that? |
#8
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Look under to see the linkage associated with the arm, you will see what it does
when the arm is up, and when it is down with no additional records.... .
__________________
Yes you can call me "Squirrel boy" |
#9
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I realize that the BSR Changers (not unlike their Collaro brethren) were meant to be easy to service but I really wonder why it was that BSR made and stuck to a changer design that was as flawed as these were for as long as they did. I mean these BSR Changers almost always have some sort of mechanical issue of some sort with them every time I run across one, and most of the mechanical issues I realize are usually due to dried grease and what not but there have been several mechanical issues I have come across with these changers like tracking issues that are not due to dried grease that makes me wonder why it was that they didn't just stick to their old designs and just redesign the casing, because I know the earlier BSR Changers from the '50s and '60s were designed very similar to the old Collaros. |
#10
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Ive found that all brands of changers usually need work, they all have grease and rubber parts that need to be renewed with age. on a BSR, take off the turntable, then remove the cam gear and clean the old grease out of the grooves in the cam , that usually solves a lot of the issues. Grease and oil oxidize, dry out, and pick up dust and dirt over time. look for anything else that has gummy grease on it, clean with Q tips and rubbing alcohol, and sparingly re grease. Don't lubricate parts that were not lubed originally. check the condition of the motor mounts and idler wheel while youre at it. Later BSR changers usually don't need to be completely disassembled, just work on one portion at a time. Usually you can get them working with that approach.
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Audiokarma |
#11
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Quote:
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#12
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Those issues arnt unique to BSR, Garrards are also famous for the trip mechanism seizing up and making the record skip at the last track. The first VM changer I worked on had the same issue. Some changers are just harder to work on than others to clean out the hardened lubricants. BSRs are one of the easiest to work on, along with VM. (the regular BSR changers, not the BSR 810, which is so compex I may never attempt to fix mine...) power switches are also a common issue on Dual changers, and 70s VM changers. At least the BSR switches dont totally disintegrate like some of the VM switches.
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#13
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How is it that you think that this particular BSR Changer Mechanism pictured below is easy to service? I don't know what planet you came from but whenever I see a record player or changer mechanism with lots of small easily lost C-clips or lots springs that need to be removed in order to properly service the changer or record player then I consider that a harder unit to service that isn't something that a beginner could easily service. Now a VM Changer on the other hand I think is an easily serviced record player and changer because even a beginner just getting into record players and that is very minimally skilled in mechanics can easily work on it because there's only one part that needs to be removed in order to be able to clean and lube the whole mechanism and you only need to remove 4 screws to get that part off, you don't have to worry about small C-clips or springs or anything like that getting lost or having to worry about memorizing which position the springs were in or what not like you do with this BSR Changer. Last edited by Captainclock; 09-20-2015 at 11:03 PM. |
#14
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Those of us that serviced them invested in the GC phono/chassis stand, NLA, but very useful. A BSR cheater is required too - they too are NLA, 'cept on eBay. Idlers and Phonolube are still available. Rubber-Renu from Rawn was the stuff we used to revitalize the rubber on the idler. We used two actual LPs for checking tracking, loading and lift. One was Johnny Cash, Live at San Quentin - both sides run-off grooves were different, so it was a good long/short test. The other was some Simon and Garfunkel LP with a larger hole in the center, used to test the drop, with it stacked with another. The above, and a good stock of Astatic 142's, needles and Tetrad cartridges was about all we needed - we had about 50 junk changers, from an old Morse/Electrophonic service center we bought out - for the parts...mostly new changers and dust covers.
__________________
Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! |
#15
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These changers expected regular use and servicing every 5 years. Zenith used BSR changers only because they could no longer get VM changers (the company's preferred brand, and they'd discontinued their belt/idler drive high end changer design)
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Audiokarma |
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