Sharp GF525 speaker query - UK Vintage Radio Repair and Restoration Discussion Forum

Phil177 · 2nd Aug 2017, 8:20 pm

Hi all just bought myself a cracking Sharp GF525 with a speaker problem. It needs new ones. I haven't received it yet so was just getting the heads up on what I need to get. Cheers Phil

Edward Huggins · 2nd Aug 2017, 9:35 pm

How do you know that it needs new speakers? They rarely fail.
It is ususally more liable to be an amplifier problem. I think this unit has 2 x 6.5" units each with a co-axial tweeter. They are liable to be Far-Eastern OEM types.

camtechman · 3rd Aug 2017, 6:13 am

Quote:

It needs new ones.

So, what is the problem that leads you to conclude it needs new ones.

Or did the seller advise that it "Needs New Ones" ?

Phil177 · 4th Aug 2017, 12:52 am

Hi the seller told me it needs new speakers. I'll wait til zI receive it through I'll let you know. If it is the amp is it an easy] fix? How can I check, I'm very new to this so I'm a bit of novice. Thanks Phil

Phil177 · 6th Aug 2017, 8:59 am

I've received the radio. In nice condition powers up OK. Right channel is very faint left is OK. Any ideas? Thanks.

Station X · 6th Aug 2017, 9:32 am

The first thing to do is to swop the speakers over to see if the problem is with the speakers or the radio.

camtechman · 6th Aug 2017, 10:08 am

Station X

This is a Boom Box and the unit will have to be opened up to swop the internal speaker wiring.

Phil 177

Is the problem the same when it's in both Radio Mode & Cassette playback ?

camtechman · 6th Aug 2017, 10:12 am

Phil 177

What's your skill level on servicing & repairing such units ?

SiriusHardware · 6th Aug 2017, 11:03 am

Phil 177 - Does the unit have a headphone socket?

If so, then plug a pair of headphones in to see if both stereo outputs work on headphones. If one output is distorted and quiet even on phones, then it isn't a speaker fault.

Phil177 · 6th Aug 2017, 5:30 pm

Thanks everyone I do think have any experience repairing these but I'll have a go at troubleshooting it. So let me get this right if headphones work on both sides the amp is ok? Cheers Phil.

'LIVEWIRE?' · 6th Aug 2017, 6:25 pm

Yes, Phil. If this is the case, the trouble could be in the headphone socket, which incorporates switches to cut out the speakers when a jack plug is inserted, or, less likely in my opinion, it could be a faulty speaker. These are easily checked with a multimeter, set to a low ohms rangepreferably an analogue one, connected across the speaker terminals. A reading of either 4 or 8 ohms (approximately) should be obtained, together with a 'click' in the speaker as the test probes are applied. This must be done withe the unit switched off. On the other hand, if the sound from one channel is weak and/or distorted when headphones are used, the amplifier is faulty.

2nd Aug 2017, 8:20 pm	#1
Phil177 Retired Dormant Member Join Date: Jul 2017 Location: Coventry, Warwickshire, UK. Posts: 23	Sharp GF525 speaker query Hi all just bought myself a cracking Sharp GF525 with a speaker problem. It needs new ones. I haven't received it yet so was just getting the heads up on what I need to get. Cheers Phil

2nd Aug 2017, 9:35 pm	#2
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,327	Re: Sharp GF525 speaker query How do you know that it needs new speakers? They rarely fail. It is ususally more liable to be an amplifier problem. I think this unit has 2 x 6.5" units each with a co-axial tweeter. They are liable to be Far-Eastern OEM types. __________________ Edward.

4th Aug 2017, 12:52 am	#4
Phil177 Retired Dormant Member Join Date: Jul 2017 Location: Coventry, Warwickshire, UK. Posts: 23	Re: Sharp GF525 speaker query Hi the seller told me it needs new speakers. I'll wait til zI receive it through I'll let you know. If it is the amp is it an easy] fix? How can I check, I'm very new to this so I'm a bit of novice. Thanks Phil

6th Aug 2017, 8:59 am	#5
Phil177 Retired Dormant Member Join Date: Jul 2017 Location: Coventry, Warwickshire, UK. Posts: 23	Re: Sharp GF525 speaker query I've received the radio. In nice condition powers up OK. Right channel is very faint left is OK. Any ideas? Thanks.

6th Aug 2017, 9:32 am	#6
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Sharp GF525 speaker query The first thing to do is to swop the speakers over to see if the problem is with the speakers or the radio. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

6th Aug 2017, 10:08 am	#7
camtechman Nonode Join Date: Jan 2008 Location: Milton Keynes, Bucks. UK. Posts: 2,552	Re: Sharp GF525 speaker query *Station X* This is a Boom Box and the unit will have to be opened up to swop the internal speaker wiring. *Phil 177* Is the problem the same when it's in both Radio Mode & Cassette playback ? __________________ When I die, please don't let my Wife sell my collection for the amount I told her I paid for it!

6th Aug 2017, 10:12 am	#8
camtechman Nonode Join Date: Jan 2008 Location: Milton Keynes, Bucks. UK. Posts: 2,552	Re: Sharp GF525 speaker query *Phil 177* What's your skill level on servicing & repairing such units ? __________________ When I die, please don't let my Wife sell my collection for the amount I told her I paid for it!

6th Aug 2017, 11:03 am	#9
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,556	Re: Sharp GF525 speaker query Phil 177 - Does the unit have a headphone socket? If so, then plug a pair of headphones in to see if both stereo outputs work on headphones. If one output is distorted and quiet even on phones, then it isn't a speaker fault.

6th Aug 2017, 5:30 pm	#10
Phil177 Retired Dormant Member Join Date: Jul 2017 Location: Coventry, Warwickshire, UK. Posts: 23	Re: Sharp GF525 speaker query Thanks everyone I do think have any experience repairing these but I'll have a go at troubleshooting it. So let me get this right if headphones work on both sides the amp is ok? Cheers Phil.

6th Aug 2017, 6:25 pm	#11
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: Sharp GF525 speaker query Yes, Phil. If this is the case, the trouble could be in the headphone socket, which incorporates switches to cut out the speakers when a jack plug is inserted, or, less likely in my opinion, it could be a faulty speaker. These are easily checked with a multimeter, set to a low ohms rangepreferably an analogue one, connected across the speaker terminals. A reading of either 4 or 8 ohms (approximately) should be obtained, together with a 'click' in the speaker as the test probes are applied. This must be done withe the unit switched off. On the other hand, if the sound from one channel is weak and/or distorted when headphones are used, the amplifier is faulty.