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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

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Old 20th Jun 2018, 6:10 pm   #1
george1960
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Default Fidelity HF43 record player.

Hi guys. I've cleaned up this deck and taken apart the vol pot. Found rusty connections, put it all back together, now I have a hum at low vol that I never had before. And there is no power or movement at the motor. I've cleaned this all up. If I turn the vol up there seems to be no power on anything, almost like the record player has been turned off. I think the vol pot is broken. I've done checks on the pot and I seem to get a reading. Posting a pic of the player
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Old 20th Jun 2018, 6:46 pm   #2
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Default Re: fidelity record player

If there is a low hum there must be power, check for broken wires to the motor and pickup.

Was it working before you took it apart? Is the on/off switch part of the volume control?
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Old 20th Jun 2018, 6:59 pm   #3
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Default Re: fidelity record player

yes it was working of sorts but the vol pot was crackling really badly
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Old 20th Jun 2018, 7:00 pm   #4
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Default Re: fidelity record player

It may have not been necessary to disassemble the volume control at all - and these don't always go back together very wel,l especially the on/off mechanics. Before we go on, we need more info and pics please - can't do much without these!
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Old 20th Jun 2018, 8:10 pm   #5
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Default Re: fidelity record player

Sorry thought I had posted a pic
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Old 20th Jun 2018, 8:29 pm   #6
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Default Re: fidelity record player

Close up photo of the volume control and it’s wiring would be useful, did you check for damaged wiring?

Bowood electronic have a useful range of controls, probably other companies.
https://www.bowood-electronics.co.uk
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Old 20th Jun 2018, 8:31 pm   #7
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Default Re: fidelity record player

George,

We need a model number and more relevant photos - that means the broken pot and the electronics and perhaps the motor connections to it...
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Old 20th Jun 2018, 10:06 pm   #8
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Default Re: fidelity record player

The pot isn't broke as I fixed it, but since putting it back it cracks when switched on. If I turn the vol up it's like turning the record player off and the motor doesn't power up.
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Old 20th Jun 2018, 10:09 pm   #9
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Default Re: Fidelity record player.

Let's have a picture of the wiring on the volume control and ON/OFF switch.
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Old 20th Jun 2018, 10:10 pm   #10
george1960
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Default Re: Fidelity record player.

more pics, the amp is an HF43 Mk 2/3 there is no model number.
hope this helps
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Old 20th Jun 2018, 10:13 pm   #11
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Default Re: Fidelity record player.

It looks to me like you've got the live side of the mains wired to the volume control, or is there something hidden behind the blue wire?
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Old 20th Jun 2018, 10:16 pm   #12
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Default Re: Fidelity record player.

Did you take a drawing of the wiring or photos before you dismantled the pot. From the photo the switch appears to have no wires connected to it.

Edit. Graham’s suggestion is a definite possibility.
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Old 20th Jun 2018, 10:21 pm   #13
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Default Re: Fidelity record player.

What's happening with those blue and brown wires above the IC? Shouldn't they go to the OFF/ON switch?
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Old 20th Jun 2018, 10:22 pm   #14
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Default Re: Fidelity record player.

I think you need to review the work you have performed, it is possible that the work done so far could possibly be dangerous from the information in that photo.
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Old 20th Jun 2018, 10:30 pm   #15
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Default Re: Fidelity record player.

I think it should look like this.
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Old 20th Jun 2018, 11:55 pm   #16
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Default Re: Fidelity record player.

Hopefully that picture is deceptive in the angle it's been taken at and that it was taken when the wires had been disconnected and before they were finally re-connected. If that's not the case, then that is one of the most scariest things that I've ever seen done on here!
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Old 21st Jun 2018, 7:34 am   #17
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Default Re: Fidelity record player.

Did you try using a spray switch cleaner (Servisol) first? Your re-wiring looks extremely dangerous - you may have completely blown the amplifier.
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Old 21st Jun 2018, 10:08 am   #18
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Default Re: Fidelity record player.

Looking at this again, I don't think it is possible to solder leads carrying mains current to the volume control pot. The tags on this appear to be soldered directly to the printed circuit board.

My guess is that the double pole switch ganged with the volume control pot feeds power to the turntable motor (brown and blue wires). A low voltage tap on the motor windings then feeds power to the amplifier via the white lead.

The first thing to do is sort out the wiring on the mains switch, there's no need for the wire stubs. While the wires are off the switch, it can be tested with a DMM on ohms range to check that both sections make and break. Then, having remade the connections check that power is reaching the turntable motor and hence the amplifier. There should be a DC voltage across the physically large electrolytic capacitor.
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Old 21st Jun 2018, 10:43 am   #19
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Default Re: Fidelity record player.

I rewired it exactly as it was prior to me cleaning it but yes I agree it looks like it was wired wrong in the first place. That would explain no power to the motor.
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Old 21st Jun 2018, 10:47 am   #20
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Default Re: Fidelity record player.

If wired as shown in post #11 neither the turntable or the amp would have worked in a billion years.
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