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Denon DP47F Help

Chuck Vance

Chuck Vance

Active Member
I own a Denon DP47F and recently the servo control of the arm (left/ right) has stopped functioning. Pressing the directional button results in the tonearm assembly moving slightly (about 1/8") but that's it.
Any suggestions on what I can look for if I open her up? Everything else works normally.

Thanks-
 
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First thought would be that something, somewhere is sticking. I have it's cousin, a JVC QL Y5F, and if I remember right there's no physical connection between the servo and the arm, it relies on magnetic fields to move the arm (I don't remember for certain if this is true for all operations of the arm). I've accidentally left the arm on mine "locked" and hit the start/stop and it does no damage to the arm because there is no physical linkage. I would start by cleaning and maybe very lightly oiling what you can. Blow out gunk with compressed air, etc. Even cleaning the switches would be a good first try. If the switches/pots are dirty, the arm won't be getting consistent power (if I understand the operation correctly).
 
The wires that go to the arm inside are very thin, and one may have broke. I have the same TT.
If one is loose you will see it.
You could have a bad cap in there.
 
Chuck Vance said:
I own a Denon DP47F and recently the servo control of the arm (left/ right) has stopped functioning. Pressing the directional button results in the tonearm assembly moving slightly (about 1/8") but that's it.
Any suggestions on what I can look for if I open her up? Everything else works normally.

Thanks-
Click to expand...
Try rotating the platter mat 180 degrees, possible the record you're using is too transparent and the record size sensor is confused.
 
seely said:
First thought would be that something, somewhere is sticking. I have it's cousin, a JVC QL Y5F, and if I remember right there's no physical connection between the servo and the arm, it relies on magnetic fields to move the arm (I don't remember for certain if this is true for all operations of the arm). I've accidentally left the arm on mine "locked" and hit the start/stop and it does no damage to the arm because there is no physical linkage. I would start by cleaning and maybe very lightly oiling what you can. Blow out gunk with compressed air, etc. Even cleaning the switches would be a good first try. If the switches/pots are dirty, the arm won't be getting consistent power (if I understand the operation correctly).
Click to expand...

Sounds like I have homework. Thanks! I'll secure it and open up the bottom and get some air/ lubrication in there. Any specific areas? I'll also check the assembly wiring.
 
Don’t think the platter mat will sit flat rotated 90 degrees. Neither one on my 45F nor 52F will sit flat. There are rubber “nubs” that have to sit inside holes in the platter, to lock it in proper position.
 
Montycat said:
Yes, and it is 90 degrees. There are extra holes in the platter to accommodate the protrusions on the mat but they don't allow access to the photocells under the platter. I have a Denon DP-47F here beside me.
Click to expand...

HamboneF18 said:
Don’t think the platter mat will sit flat rotated 90 degrees. Neither one on my 45F nor 52F will sit flat. There are rubber “nubs” that have to sit inside holes in the platter, to lock it in proper position.
Click to expand...

Ok then.

Screenshot_20230123-200854.png PXL_20230124_040532020.jpg PXL_20230124_040538979.jpg PXL_20230124_040552661.jpg
 
So...
If I have a regular opaque record, I want the rubber mat rotated so that the rectangular windows on the platter are visible thru the mat, correct?
 
Re: cleaning, also note that the track at the back of the arm, the arc that the arm height adjustment pin rides in, may be dirty. That can hamper smooth arm movement. Best to clean it, and some people lubricate it as well.
 
Tonoje said:
Re: cleaning, also note that the track at the back of the arm, the arc that the arm height adjustment pin rides in, may be dirty. That can hamper smooth arm movement. Best to clean it, and some people lubricate it as well.
Click to expand...

Don’t ever lubricate that track! Clean, yes. But that’s all!

That track is a damper for the arm. It provides FRICTION for the arm servos to work against. Without it, the arm swings fast and uncontrollably. It also sets height for the arm return.
 
So? Mine works fine.

I like how Montycat is dust free. The DP 47F I have loves dust. Maybe just dry winter. I have had the TT since mid October. (I am not relishing the return of Summer :no:)
 
Just clean your table before you tell it to say, “Cheese!”

My DP45F and 52F have been working fine since 1985 and 1987. But I had them both reworked at the Denon factory in 1991. Salt air was hard on them.
 
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