denon dp-47f repair

jaudio · 29th September 2005, 11:45 AM

Has anyone done repair work on the denon dp-47f speed controls?

jaudio · 15th October 2005, 07:25 PM

The problem I have is the platter wont turn. I can feel the motor vibrating but not turning. I measured the voltage on motor pcb,I'm getting -13.75 and +9.45( the stated voltage is +/-12) Any help?

maxro · 16th October 2005, 03:22 AM

I'm far from an expert here, but here goes.

On most (all?) direct drive denons there is a magnetic strip inside the rim of the platter and a tape head type of device to read the platter speed. If the head is out of alignment, then speed will be wrong, but this shouldn't keep it from turning. If the magnetic strip has been de-magnetized, then it is toast. I don't think that this is the problem, though.

If you start the platter spinning by hand, will the motor kick in?

Does the arm lifter drop when you press the start button?

The arm lift (and motor stop) has an optical sensor somewhere. Maybe it thinks that the arm is at the end of the record.

good luck,
Max

jaudio · 16th October 2005, 04:20 AM

Thanks for the response

Quote:

Originally posted by maxro

If you start the platter spinning by hand, will the motor kick in?

No. It will rock back and forth,about a inch then it stops

Quote:

Originally posted by maxro

Does the arm lifter drop when you press the start button?

Yes All arm functions work

maxro · 16th October 2005, 04:24 AM

Hmm... Well, I'm all out of ideas. Sounds like a circuitry problem. Perhaps someone else has a solution.

Max

jaudio · 16th October 2005, 04:45 AM

Thanks Maxro

jaudio · 18th October 2005, 01:57 AM

It took 4 days but it working. I paid $22 for this turntable. It had a cracked frame and some broken traces. I epoxyed the frame and bridged the traces. All the functions work. Oh, It also came with a good audio technca AT OC9. I cant wait for the weekend,to sit down and give it a good listen.

Thanks again for the Idea, where to look.

jaudio · 18th October 2005, 02:02 AM

Here another picture. I took off the OC9,while I was repairing the turntable.

Maxro thanks again for the Idea, where to look

maxro · 18th October 2005, 02:33 AM

$22?! Even with four days of monkeying, that's a steal. Now you get to enjoy the fruits of your labours.

Max

maxro · 19th October 2005, 03:27 AM

I was surfing and came across this if you have any future problems:

http://www.vinylengine.com/manuals_denon.shtml

Max

29th September 2005, 11:45 AM	#1
jaudio diyAudio Member Join Date: Oct 2004	denon dp-47f repair Has anyone done repair work on the denon dp-47f speed controls?

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15th October 2005, 07:25 PM	#2
jaudio diyAudio Member Join Date: Oct 2004	The problem I have is the platter wont turn. I can feel the motor vibrating but not turning. I measured the voltage on motor pcb,I'm getting -13.75 and +9.45( the stated voltage is +/-12) Any help?

16th October 2005, 03:22 AM	#3
maxro diyAudio Member Join Date: Dec 2004 Location: Survey says: Least happiest city in Canada	I'm far from an expert here, but here goes. On most (all?) direct drive denons there is a magnetic strip inside the rim of the platter and a tape head type of device to read the platter speed. If the head is out of alignment, then speed will be wrong, but this shouldn't keep it from turning. If the magnetic strip has been de-magnetized, then it is toast. I don't think that this is the problem, though. If you start the platter spinning by hand, will the motor kick in? Does the arm lifter drop when you press the start button? The arm lift (and motor stop) has an optical sensor somewhere. Maybe it thinks that the arm is at the end of the record. good luck, Max

16th October 2005, 04:24 AM	#5
maxro diyAudio Member Join Date: Dec 2004 Location: Survey says: Least happiest city in Canada	Hmm... Well, I'm all out of ideas. Sounds like a circuitry problem. Perhaps someone else has a solution. Max

16th October 2005, 04:45 AM	#6
jaudio diyAudio Member Join Date: Oct 2004	Thanks Maxro

18th October 2005, 02:33 AM	#9
maxro diyAudio Member Join Date: Dec 2004 Location: Survey says: Least happiest city in Canada	$22?! Even with four days of monkeying, that's a steal. Now you get to enjoy the fruits of your labours. Max

19th October 2005, 03:27 AM	#10
maxro diyAudio Member Join Date: Dec 2004 Location: Survey says: Least happiest city in Canada	I was surfing and came across this if you have any future problems: http://www.vinylengine.com/manuals_denon.shtml Max

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