ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Now that the backward-spinning platter is resolved, I have another question that I am hoping someone else can answer, possibly by observing their unit's behavior.
I've been working on the arm and have addressed all the usual areas- sticky grease, adjustment drift, etc and the arm is now working well. However, there's one thing that I'm pretty sure that I will need to chase, and that's the STOP sequence.
When playing a record, if I hit STOP, the arm mechanism starts to rotate BEFORE the solenoid releases. The net effect of this is that there is lateral stress put on the cantilever as the arm comes up. I'm thinking that this might just be a time-constant issue caused by a cap that has changed value, but I am working from very bad PDFs of two different manuals- one for the older versions and another for this 5513 series that is much worse than the first PDF (and is also incomplete). So it's difficult for me to determine what is going on in the circuit.
I had planned to change out the electrolytics on the control board, but was wondering if anyone else had any ideas about this behavior. I don't want to chase something that's normal!
So you mean you do hear the loud click after the carriage motor has started runnning?
Jacques
As I understand it, they both start operating at the same time, so inevitably the arm will move before the needle has completely lifted off the tracks, because there's some mechanical slack in the lift mechanism. In other words, no special sequencing that could be out of shape. The arm lift needs to be adjusted properly though, so that there isn't an unnecessary large clearance to take up before the arm starts to rise.
The service manuals currently on site for silver & gold members are rather good, the older copies liberated from the site earlier not necessarily so
--mika
@Jacques: Yes. I would think that there should be a slight delay before the carriage motor starts to run, but the click appears to occur after it starts to turn. So the stylus is still in the groove when the motor starts to run.
@Mika: This is what I wanted to know. Yes, I realize that the manuals that are available with a premium membership are better, and I may just have to do that. I will double-check the clearances and make sure that they are correct in order to minimize hysteresis. Seems like rather an oversight on B&O's part, though. Wouldn't have been hard to make for some delay in this function. I am going to try to take a look at the circuit and see if there's anything that could be improved for this, but it's hard with these PDFs.
The arm should pop up quickly,there is a spring for this.You may need to recheck all the lever's and pivots for free movement.They can seem ok,but need to be really free.Once the holding current of the solenoid is removed,the arm mech should return to it's raised position quickly without the pu dragging.
Nick