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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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11th Dec 2019, 3:58 pm | #1 |
Tetrode
Join Date: Oct 2008
Location: Glasgow, UK.
Posts: 70
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Pioneer SX-424 only playing one channel
Hi, I've just dug an old SX-424 out of a cupboard and spent half the morning rearranging my living room to accommodate it! Just switched it on and I'm only getting sound from one speaker. It worked a couple of years ago when it went in the cupboard. The only thing I can imagine I've done is turn it upside down today to re-attach the feet I'd previously removed. But I did it carefully and seriously doubt that would cause this issue.
It's definitely the amp - I've tried headphones, tried swapping speakers, different carts, the radio. Nothing gives me left and right. The weird balance/voume knob really doesn't help matters! I've opened it up but have no idea what I'm looking at. Any suggestions on what may be a simple fix before I look for someone? |
11th Dec 2019, 4:08 pm | #2 |
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Join Date: Jun 2003
Location: Oxford, UK
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Re: Pioneer SX-424 only playing one channel
Clean all the switch contacts with Servisol.
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11th Dec 2019, 4:08 pm | #3 |
Octode
Join Date: Dec 2018
Location: Llandeilo, West Wales, UK.
Posts: 1,092
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Re: Pioneer SX-424 only playing one channel
There are 3 fuses on the rear on some models?
One is mains, leave that alone. The other 2 are marked 'Protection Fuse' Left and Right? Check one has not blown.
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11th Dec 2019, 4:29 pm | #4 |
Tetrode
Join Date: Oct 2008
Location: Glasgow, UK.
Posts: 70
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Re: Pioneer SX-424 only playing one channel
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11th Dec 2019, 5:03 pm | #5 |
Tetrode
Join Date: Oct 2008
Location: Glasgow, UK.
Posts: 70
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Re: Pioneer SX-424 only playing one channel
Another quick question - I can't find 1.2A fuses in the UK - I assume it's OK to go for a higher ampage?
Last edited by WalterGibbons; 11th Dec 2019 at 5:09 pm. |
11th Dec 2019, 5:18 pm | #6 |
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Location: Ipswich, Suffolk, IP4, UK.
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Re: Pioneer SX-424 only playing one channel
I'd advise against going higher.
In order to recommend a fuse we'd need to know its physical size and speed. The latter is generally indicated by the lettering on the end caps.
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11th Dec 2019, 5:22 pm | #7 | |
Tetrode
Join Date: Oct 2008
Location: Glasgow, UK.
Posts: 70
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Re: Pioneer SX-424 only playing one channel
Quote:
I don't have a way to measure 100% accurately, but to my eye it's 30mm x approximately 6mm. Thank you - I was actually tying my laces there to go to Halfords |
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11th Dec 2019, 5:28 pm | #8 |
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Re: Pioneer SX-424 only playing one channel
SOC is the manufacturer. There should be other markings as described here:-
https://www.swe-check.com.au/pages/l...e_markings.php
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
11th Dec 2019, 5:37 pm | #9 |
Tetrode
Join Date: Oct 2008
Location: Glasgow, UK.
Posts: 70
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Re: Pioneer SX-424 only playing one channel
The only other thing is a symbol - Kind of Letter T with two top bars, in a triangle.
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11th Dec 2019, 5:42 pm | #10 |
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Re: Pioneer SX-424 only playing one channel
That's the approval marking. In this case MITI (Japan) - now know as METI.
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
11th Dec 2019, 5:42 pm | #11 |
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Re: Pioneer SX-424 only playing one channel
BTW. Have you swopped the good fuse to the other channel to check that it works?
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
11th Dec 2019, 5:44 pm | #12 |
Tetrode
Join Date: Oct 2008
Location: Glasgow, UK.
Posts: 70
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Re: Pioneer SX-424 only playing one channel
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11th Dec 2019, 5:46 pm | #13 |
Tetrode
Join Date: Oct 2008
Location: Glasgow, UK.
Posts: 70
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Re: Pioneer SX-424 only playing one channel
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11th Dec 2019, 5:48 pm | #14 |
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Re: Pioneer SX-424 only playing one channel
These should do the job. Other suppliers are available.
https://uk.rs-online.com/web/p/cartridge-fuses/0412649/
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
11th Dec 2019, 5:57 pm | #15 | |
Tetrode
Join Date: Oct 2008
Location: Glasgow, UK.
Posts: 70
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Re: Pioneer SX-424 only playing one channel
Quote:
Would I do damage if I used this..? https://www.halfords.com/workshop-to...s-2-amp-hfs117 (Halfords is 2 mins walk from me!) |
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11th Dec 2019, 6:01 pm | #16 | |
Octode
Join Date: Dec 2018
Location: Llandeilo, West Wales, UK.
Posts: 1,092
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Re: Pioneer SX-424 only playing one channel
Quote:
You will find 1.25A, 6 x 30mm (= 6.3 x 32mm = 1/4 x 1 1/4 inch) cartridge fuses on line. CPC, Farnell and ebay. Buy a few. Once you have them, swap the good side one for the blown one. If it works all is good. If it 'pops' there is a fault on the amplifier or that speaker / cable.
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11th Dec 2019, 6:10 pm | #17 | |
Octode
Join Date: Dec 2018
Location: Llandeilo, West Wales, UK.
Posts: 1,092
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Re: Pioneer SX-424 only playing one channel
Quote:
If you swap the good fuse to the faulty side and it works, then they would be ok for a temporary fix. Order some proper rating ones and fit them ASAP. If it fails you have 2 dead fuses and a faulty channel...
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11th Dec 2019, 6:16 pm | #18 | |
Tetrode
Join Date: Oct 2008
Location: Glasgow, UK.
Posts: 70
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Re: Pioneer SX-424 only playing one channel
Quote:
Just saw RS do free next day delivery on some 14 pence fuses! So I guess I can contain myself till tomorrow. It's too wet to walk to Halfords anyway. |
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