Collaro Challenger - UK Vintage Radio Repair and Restoration Discussion Forum

John10b · 18th Sep 2021, 3:38 pm

After many hours working on the above deck it is now working, however the arm needs very slight adjustment and I need to confirm how this is done, I’ve attached a picture which shows arrow pointing towards a screw, is this the pu arm set down adjustment ?
I have read Maurice Michael excellent write up on the Conquest, with additional comments my Edward. Thanks
John

Michael Maurice · 18th Sep 2021, 9:08 pm

Yes it is.

John10b · 18th Sep 2021, 10:16 pm

Thank you Michael, just to clarify, do I only turn the screw slightly or do I have to move the plate? I have put a request in the wanted section for info and a switch.
When I tried to open your link it say it can’t find it ?
John

Edward Huggins · 19th Sep 2021, 9:56 am

In my experience you only need to turn that screw VERY slightly. Mark the optimum position with a pencil. Best to test on a 10" disc.

John10b · 19th Sep 2021, 10:28 am

Thank you Edward, I will certainly be very observant and take more pictures. When I first received this RP the Collaro deck was seized up, so I stripped the mechanism and eventually got it to function correctly apart fro two things: PU Arm was to high and touching other records, I adjusted the appropriate screw, see picture, and that’s now ok, and the second is the setting down at start of play, it just needs a very slight adjustment to bring it onto record.

John

John10b · 19th Sep 2021, 11:21 am

Just before I make any further adjustments could I ask your views on the following.
During the strip down, clean etc I removed the PU Arm assembly, see pictures, could the reassemble position be out very slightly, are the two screws to adjust the course position of the PU Arm ? Thanks
John

Edward Huggins · 19th Sep 2021, 12:29 pm

If you are talking about the 2 small forward-facing screws, yes these can have a small affect on the drop position of the tone arm. I'm not quite sure why you felt the need to dissmantle this part?

John10b · 19th Sep 2021, 1:44 pm

I completely stripped the Mechanism to clean etc, perhaps I was a little too enthusiastic, to do this you had to undo the PU arm attachment. I’ve attached a picture showing the separated mechanism.
John

Michael Maurice · 19th Sep 2021, 5:12 pm

Quote:

Originally Posted by Edward Huggins

If you are talking about the 2 small forward-facing screws, yes these can have a small affect on the drop position of the tone arm. I'm not quite sure why you felt the need to dissmantle this part?

No they don’t Edward. Only the adjustment on the cam sets the set down position. The two screws were an adjustment for the set down position on the earlier RC54, RC456 and RC457

John10b · 19th Sep 2021, 7:10 pm

Thank you for the clarification. I’m interested to know what exactly does the screw on the cam do, does it cause the plate to move ? When I had the mechanism on the bench I should have taken more close up pictures to see how it worked. Thanks.
John

Michael Maurice · 19th Sep 2021, 11:31 pm

I think the screw has an eccentric cam as part of it, so it moves the plate slightly.

John10b · 20th Sep 2021, 9:45 am

Thank you.
John

John10b · 20th Sep 2021, 1:34 pm

Adjustment made, see picture, Stylus now sits at correct position.
John

18th Sep 2021, 3:38 pm	#1
John10b Nonode Join Date: Nov 2016 Location: Aberaeron, Ceredigion, Wales, UK. Posts: 2,884	Collaro Challenger After many hours working on the above deck it is now working, however the arm needs very slight adjustment and I need to confirm how this is done, I’ve attached a picture which shows arrow pointing towards a screw, is this the pu arm set down adjustment ? I have read Maurice Michael excellent write up on the Conquest, with additional comments my Edward. Thanks John Attached Thumbnails

18th Sep 2021, 9:08 pm	#2
Michael Maurice Moderator Join Date: Feb 2006 Location: Wembley, Middlesex Posts: 7,224	Re: Collaro Challenger Yes it is. __________________ Forum Moderator http://www.michaelmauricerepairs.co.uk/

18th Sep 2021, 10:16 pm	#3
John10b Nonode Join Date: Nov 2016 Location: Aberaeron, Ceredigion, Wales, UK. Posts: 2,884	Re: Collaro Challenger Thank you Michael, just to clarify, do I only turn the screw slightly or do I have to move the plate? I have put a request in the wanted section for info and a switch. When I tried to open your link it say it can’t find it ? John

19th Sep 2021, 9:56 am	#4
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,327	Re: Collaro Challenger In my experience you only need to turn that screw VERY slightly. Mark the optimum position with a pencil. Best to test on a 10" disc. __________________ Edward.

19th Sep 2021, 10:28 am	#5
John10b Nonode Join Date: Nov 2016 Location: Aberaeron, Ceredigion, Wales, UK. Posts: 2,884	Re: Collaro Challenger Thank you Edward, I will certainly be very observant and take more pictures. When I first received this RP the Collaro deck was seized up, so I stripped the mechanism and eventually got it to function correctly apart fro two things: PU Arm was to high and touching other records, I adjusted the appropriate screw, see picture, and that’s now ok, and the second is the setting down at start of play, it just needs a very slight adjustment to bring it onto record. John Attached Thumbnails

19th Sep 2021, 11:21 am	#6
John10b Nonode Join Date: Nov 2016 Location: Aberaeron, Ceredigion, Wales, UK. Posts: 2,884	Re: Collaro Challenger Just before I make any further adjustments could I ask your views on the following. During the strip down, clean etc I removed the PU Arm assembly, see pictures, could the reassemble position be out very slightly, are the two screws to adjust the course position of the PU Arm ? Thanks John Attached Thumbnails

19th Sep 2021, 12:29 pm	#7
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,327	Re: Collaro Challenger If you are talking about the 2 small forward-facing screws, yes these can have a small affect on the drop position of the tone arm. I'm not quite sure why you felt the need to dissmantle this part? __________________ Edward.

19th Sep 2021, 1:44 pm	#8
John10b Nonode Join Date: Nov 2016 Location: Aberaeron, Ceredigion, Wales, UK. Posts: 2,884	Re: Collaro Challenger I completely stripped the Mechanism to clean etc, perhaps I was a little too enthusiastic, to do this you had to undo the PU arm attachment. I’ve attached a picture showing the separated mechanism. John Attached Thumbnails

19th Sep 2021, 7:10 pm	#10
John10b Nonode Join Date: Nov 2016 Location: Aberaeron, Ceredigion, Wales, UK. Posts: 2,884	Re: Collaro Challenger Thank you for the clarification. I’m interested to know what exactly does the screw on the cam do, does it cause the plate to move ? When I had the mechanism on the bench I should have taken more close up pictures to see how it worked. Thanks. John

19th Sep 2021, 11:31 pm	#11
Michael Maurice Moderator Join Date: Feb 2006 Location: Wembley, Middlesex Posts: 7,224	Re: Collaro Challenger I think the screw has an eccentric cam as part of it, so it moves the plate slightly. __________________ Forum Moderator http://www.michaelmauricerepairs.co.uk/

20th Sep 2021, 9:45 am	#12
John10b Nonode Join Date: Nov 2016 Location: Aberaeron, Ceredigion, Wales, UK. Posts: 2,884	Re: Collaro Challenger Thank you. John

20th Sep 2021, 1:34 pm	#13
John10b Nonode Join Date: Nov 2016 Location: Aberaeron, Ceredigion, Wales, UK. Posts: 2,884	Re: Collaro Challenger Adjustment made, see picture, Stylus now sits at correct position. John Attached Thumbnails