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Post by e093116 on Mar 19, 2018 13:49:24 GMT
Hello,
My STD160 has started acting up intermittently. It will "randomly" throw in a few extra selections after a good selection. Say if I select only 150, it will play 150, followed by 152, 155, 158, usually 2-5 selections "downstream" of the selection.
It will also occasionally play after the reversing switch is actuated, usually 279, 278, etc, or 100, 101...also once or twice the mechanism has been "stuck" in the same spot, repeatedly grabbing/playing the record without scanning, but "fixed itself" before I could solve the issue.
My guess is that a set of switch contacts needs adjustment and the movement/vibration associated with the play/scan transition or scan reversal is the cause.
Any comments or guidance would be appreciated.
Thank you.
Bill
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Post by Ron Rich on Mar 19, 2018 13:59:06 GMT
Bill,
Your problem is most likely one of the three RCA "Tormat" plugs is making poor "ground" contact. or the ground going to the mech is poor--
Ron Rich
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Post by paradisecs on Mar 19, 2018 21:17:07 GMT
Not to high-jack the thread but is there a way to replace the old rca cables with new ones? I have one that either has a fault in the cable or the ground as you say. It works after manhandling it (plugging in, out, etc,) for a few selections but then stops again. Or if it is just a ground, how would you make a better ground connection? Everything passes continuity.
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Post by Ron Rich on Mar 20, 2018 0:12:06 GMT
I have never run into one that needed replacement--which model phono ? Did you CLEAN the ground (ring) connection on the jack and tighten the ring(s) on the cable plug ? Ron Rich
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Post by Lincoln on Mar 20, 2018 2:07:26 GMT
My STD160 does the same thing. When it starts doing it, I wiggle the rca plug that comes from the tormat that plugs in by the service switches. Sometimes I have to hold my tongue just right to get it to work. One of these days I'll clean it like Ron says.
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Post by e093116 on Mar 21, 2018 13:56:11 GMT
Ron,
Thanks for the help. I had a chance to play a couple songs last night and it acted up, so I dorked with the RCAs by the service switches, this made the problem worse. I cleaned them little bit and it seemed to be better but I didn't get a chance to play more than a couple songs. I'm getting some new records in the mail this week and should have some time to myself on Sunday for more "testing"...thanks again for your help. At least now I can duplicate the problem.
Paradise,
I'd strongly consider Ron's advise first and foremost. If after cleaning both sides of the connection and "compressing" the "wings" on the RCA connector slightly, you still have problems, consider expanding your "testing" from basic continuity of the wires, to more end-to-end system measurements. Also, most issues are at or near the connection points, you might flex/strain the wire while you are measuring the resistance and see if the resistance changes at all. I've seen/found breaks in the wires (not on jukeboxes) where the stranded conductors are broken inside of the wire insulation and are making intermittent contact. From the outside, the wire looks perfect/undisturbed.
I have an LS1 that the RCA for the tormat was cut or broken off. I was able to repair by splicing in a new RCA end on to the primary conductor and soldering a jumper wire to extend the shield. Most RCA cables where you'd scab a good end from are not shielded...
Bill |
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Post by robnyc on Mar 21, 2018 15:35:49 GMT
RCA plugs are the bane of anyone who gets stuck using consumer grade audio equipment in commercial service. For the ground problems I simply solder a very short lead from the shell to a spade lug and attach it to any convenient screw that is at chassis-ground potential.
For things that are really critical and could cause a nuisance service call. I eliminate the plugs and install a European type terminal strip. That is probably overkill for anything in home use.
RobNYC
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Post by Ron Rich on Mar 21, 2018 17:00:08 GMT
Rob,
In this case, this is NOT what you want to do--that ground must "float" at the inter-connector ! Be 100% sure the ground on the mechanism PLUG thru the screw on the carriage is good ( i would replace that 6/32 screw and add a nut to the rear of the switch plate. Ron Rich
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Post by robnyc on Mar 21, 2018 19:39:33 GMT
Rob, In this case, this is NOT what you want to do--that ground must "float" at the inter-connector ! Be 100% sure the ground on the mechanism PLUG thru the screw on the carriage is good ( i would replace that 6/32 screw and add a nut to the rear of the switch plate. Ron Rich  www.flickr.com/photos/90641375@N06/26071578467/Ron, what I have shows a straight-forward ground to the S-S chassis and then to the DCC pan as well. Rob |
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Post by Ron Rich on Mar 21, 2018 20:13:47 GMT
Rob,
All 160 select,Seeburgs starting with the USC-1 thru the STD-4, model, used a "jumper" on the sense lead. This jumper went from the DCC to an ISOLATED twin RCA type, jack. In the USC-1, this jack is located on the upper shelf to the left of the TSA-10, on newer models, the jack is on the left of the mechanism. If this jack gets grounded at this point--"all hell can break loose" ! Ron
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