Philips Hi-Z record player - Page 3 - UK Vintage Radio Repair and Restoration Discussion Forum

Michael Maurice · 21st Apr 2010, 11:47 pm

Which brings us back to the original problem of no or very little sound.

You need to familiarise yourself with the test meter, and you need to distinguish between the various ranges, ohms, volts and amps.

You will need to measure both ohms and volts but not at the same time.

Let us start with the loudspeaker circuit.

I want you to set your meter to the Ohms range for measuring up to 2000 ohms (2K) and with the set switched off and unplugged measure across the terminals of the large loudspeaker. You should get a reading of approx 800 ohms.

Connected to one terminal of the speaker is an inductor, now not having seen the set, I cant tell you how big or small it is but its quite likely to take the shape of a large resistor. Put your meter terminals on this and measure it, again I dont know what reading you'll get but I'd expect a few ohms.

Try the above checks and report back

Good luck

Michael

One thing, If at any time you dont feel confident or happy, stop and tell us, hopefully someone local can assist you.

roxarama · 22nd Apr 2010, 7:47 pm

Michael - there are 2 speakers of the same size side by side behind the grille. Looking from the rear the left one is partly hidden behind a board (no idea why) but right hand can be reached if I remove what I assume is the amplifier. Would a photo help?

roxarama · 22nd Apr 2010, 8:10 pm

I have removed 4 bolts to free the amplifier and 2 leads with mini-jacks (red & black) but there are several other wires which mean the amplifier can't be removed far enough to reach the speakers - without cutting them. I must admit I'm feeling somewhat out of my depth already and so I'll pause here and await further guidance.

KeithEllis · 22nd Apr 2010, 11:52 pm

Before you go any further, I would take several close-up digital photos of the wires that you may have to cut and where they attach to, to save confusion later. If I'm faced with this problem, I either cut them half way so there's a good length either side, or at about an inch from the point where I'm going to reattach them. If cut half way they can then be reattached using terminal block, although I wouldn’t use this method for the mains from the amp to the deck. Of course you could always de-solder them from their tags, but again be sure to photograph the area concerned first. And if there's more than one of the same colour, tag each end and number them.
Start by taking the photographs, and wait to see what advice others may offer.
Regards
Keith

roxarama · 23rd Apr 2010, 11:19 am

Very sound advice. I have an irrational fear of turning a simple repair into a total rebuild! Thanks.

21st Apr 2010, 11:47 pm	#41
Michael Maurice Moderator Join Date: Feb 2006 Location: Wembley, Middlesex Posts: 7,224	Re: Philips Hi-Z record player Which brings us back to the original problem of no or very little sound. You need to familiarise yourself with the test meter, and you need to distinguish between the various ranges, ohms, volts and amps. You will need to measure both ohms and volts but not at the same time. Let us start with the loudspeaker circuit. I want you to set your meter to the Ohms range for measuring up to 2000 ohms (2K) and with the set switched off and unplugged measure across the terminals of the large loudspeaker. You should get a reading of approx 800 ohms. Connected to one terminal of the speaker is an inductor, now not having seen the set, I cant tell you how big or small it is but its quite likely to take the shape of a large resistor. Put your meter terminals on this and measure it, again I dont know what reading you'll get but I'd expect a few ohms. Try the above checks and report back Good luck Michael One thing, If at any time you dont feel confident or happy, stop and tell us, hopefully someone local can assist you.

22nd Apr 2010, 7:47 pm	#42
roxarama Retired Dormant Member Join Date: Apr 2010 Location: Exeter, Devon, UK. Posts: 64	Re: Philips Hi-Z record player Michael - there are 2 speakers of the same size side by side behind the grille. Looking from the rear the left one is partly hidden behind a board (no idea why) but right hand can be reached if I remove what I assume is the amplifier. Would a photo help?

22nd Apr 2010, 8:10 pm	#43
roxarama Retired Dormant Member Join Date: Apr 2010 Location: Exeter, Devon, UK. Posts: 64	Re: Philips Hi-Z record player I have removed 4 bolts to free the amplifier and 2 leads with mini-jacks (red & black) but there are several other wires which mean the amplifier can't be removed far enough to reach the speakers - without cutting them. I must admit I'm feeling somewhat out of my depth already and so I'll pause here and await further guidance.

22nd Apr 2010, 11:52 pm	#44
KeithEllis Retired Dormant Member Join Date: Nov 2006 Location: Nottingham, Notts. UK. Posts: 113	Re: Philips Hi-Z record player Before you go any further, I would take several close-up digital photos of the wires that you may have to cut and where they attach to, to save confusion later. If I'm faced with this problem, I either cut them half way so there's a good length either side, or at about an inch from the point where I'm going to reattach them. If cut half way they can then be reattached using terminal block, although I wouldn’t use this method for the mains from the amp to the deck. Of course you could always de-solder them from their tags, but again be sure to photograph the area concerned first. And if there's more than one of the same colour, tag each end and number them. Start by taking the photographs, and wait to see what advice others may offer. Regards Keith

23rd Apr 2010, 11:19 am	#45
roxarama Retired Dormant Member Join Date: Apr 2010 Location: Exeter, Devon, UK. Posts: 64	Re: Philips Hi-Z record player Very sound advice. I have an irrational fear of turning a simple repair into a total rebuild! Thanks.