Panasonic NV-FS200 Power Supply - UK Vintage Radio Repair and Restoration Discussion Forum

Rennie93 · 15th Apr 2017, 8:45 pm

Hello,

This is a power supply from a Panasonic Fs200 SVHS. The machine works "ok" but I'm starting the process of checking everything over to see if there is anything I can replace or update. Attached is an image of the PSU. There is an old "electrical" smell from inside the machine and the HIFI audio doesn't work properly.

I was curious as to the discolouration and marks on the bottom centre? Has something leaked? The caps look ok superficially. Any initial thoughts would be welcome.

r

julie_m · 15th Apr 2017, 9:41 pm

Looks to me more like something has been on fire!

Possibly that orange component near the green wirewound resistor. If it's a Tantalum capacitor (which were never particularly smoke-tight), most modern electrolytics will substitute just fine in older circuits -- they have improved since those days.

The sooty deposits may well be conductive, so do clean them off.

Rennie93 · 15th Apr 2017, 10:05 pm

It did look rather suspicious! Like I say the machine seems to work ok.

I'll get myself the service manual and a soldering iron and see if I can fiddle about.

IanNVJ35 · 15th Apr 2017, 10:12 pm

Fret not - that is absolutely fine. Mine was just the same - its just baked on dust from convection.

I have just rebuilt an FS200 PSU as felt that the capacitors had been in there long enough - and sure enough the secondary ones were all starting to weep around the leg. Change all the secondary capacitors and then try the machine again - you may well fix any buggy issues.

Rennie93 · 15th Apr 2017, 10:22 pm

Was it easy enough to get the PSU out? Looking at the service manual briefly (albeit for AG1980) it seems to suggest it should just lift out after 3 screws are removed? The 1980 manual is great and really goes into depth whereas the fs200 manuals I've seen so far really only talk about taking the panels off.

IanNVJ35 · 15th Apr 2017, 11:16 pm

It was a doddle. Two black screws on the back and two holding the PSU in from the top. It just lifts out as a block, with two connectors to release when you pull it out a little way. Make sure you use good quality Panasonic low ESR types - don't buy Teapo or Suntan brand.

Rennie93 · 16th Apr 2017, 10:20 am

Will give that a try then. Many thanks.

Welsh Anorak · 17th Apr 2017, 11:11 am

I'd agree - on one of these you need to use Panasonic 105 degree parts. CPC stock them - use the better quality gold coloured ones like those that are in there.
Don't forget these machines were usually left in standby, often in a poorly ventilated cupboard for many years, and the board bakes in the heat. I've seen far worse soldiering on!
The poor hi-fi could be worn heads, although the capacitor change may well get everything going well. It's the right place to start, anyway.
Glyn

Rennie93 · 18th Apr 2017, 10:14 pm

I'm going to take a look and see if I can do it myself. Obviously with a PSU I'll need to be cautious.

Worst case I'll take the PSU to a local tv/dvd repairer. Maybe they'd be prepared to replace the caps for me, even though they don't do VHS machines anymore. In this case I'll definitely pass on your recommendation for the Panasonic 105 degree parts.

many thanks!

r

IanNVJ35 · 18th Apr 2017, 11:41 pm

Some desolder braid and a nice quality iron like the 25 Watt Antex and you will do fine I'm sure. Make sure to use leaded solder as lead free won't mix (called reflow solder).

15th Apr 2017, 8:45 pm	#1
Rennie93 Triode Join Date: Dec 2016 Location: Frankfurt, Germany. Posts: 32	Panasonic NV-FS200 Power Supply Hello, This is a power supply from a Panasonic Fs200 SVHS. The machine works "ok" but I'm starting the process of checking everything over to see if there is anything I can replace or update. Attached is an image of the PSU. There is an old "electrical" smell from inside the machine and the HIFI audio doesn't work properly. I was curious as to the discolouration and marks on the bottom centre? Has something leaked? The caps look ok superficially. Any initial thoughts would be welcome. r Attached Thumbnails

15th Apr 2017, 9:41 pm	#2
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: Panasonic NV-FS200 Power Supply Looks to me more like something has been on fire! Possibly that orange component near the green wirewound resistor. If it's a Tantalum capacitor (which were never particularly smoke-tight), most modern electrolytics will substitute just fine in older circuits -- they have improved since those days. The sooty deposits may well be conductive, so do clean them off. __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.

15th Apr 2017, 10:05 pm	#3
Rennie93 Triode Join Date: Dec 2016 Location: Frankfurt, Germany. Posts: 32	Re: Panasonic NV-FS200 Power Supply It did look rather suspicious! Like I say the machine seems to work ok. I'll get myself the service manual and a soldering iron and see if I can fiddle about.

15th Apr 2017, 10:12 pm	#4
IanNVJ35 Heptode Join Date: Mar 2010 Location: Hemel Hempstead, Hertfordshire, UK. Posts: 847	Re: Panasonic NV-FS200 Power Supply Fret not - that is absolutely fine. Mine was just the same - its just baked on dust from convection. I have just rebuilt an FS200 PSU as felt that the capacitors had been in there long enough - and sure enough the secondary ones were all starting to weep around the leg. Change all the secondary capacitors and then try the machine again - you may well fix any buggy issues.

15th Apr 2017, 10:22 pm	#5
Rennie93 Triode Join Date: Dec 2016 Location: Frankfurt, Germany. Posts: 32	Re: Panasonic NV-FS200 Power Supply Was it easy enough to get the PSU out? Looking at the service manual briefly (albeit for AG1980) it seems to suggest it should just lift out after 3 screws are removed? The 1980 manual is great and really goes into depth whereas the fs200 manuals I've seen so far really only talk about taking the panels off. Last edited by Rennie93; 15th Apr 2017 at 10:28 pm.

15th Apr 2017, 11:16 pm	#6
IanNVJ35 Heptode Join Date: Mar 2010 Location: Hemel Hempstead, Hertfordshire, UK. Posts: 847	Re: Panasonic NV-FS200 Power Supply It was a doddle. Two black screws on the back and two holding the PSU in from the top. It just lifts out as a block, with two connectors to release when you pull it out a little way. Make sure you use good quality Panasonic low ESR types - don't buy Teapo or Suntan brand.

16th Apr 2017, 10:20 am	#7
Rennie93 Triode Join Date: Dec 2016 Location: Frankfurt, Germany. Posts: 32	Re: Panasonic NV-FS200 Power Supply Will give that a try then. Many thanks.

17th Apr 2017, 11:11 am	#8
Welsh Anorak Dekatron Join Date: Apr 2005 Location: North Wales, UK. Posts: 6,921	Re: Panasonic NV-FS200 Power Supply I'd agree - on one of these you need to use Panasonic 105 degree parts. CPC stock them - use the better quality gold coloured ones like those that are in there. Don't forget these machines were usually left in standby, often in a poorly ventilated cupboard for many years, and the board bakes in the heat. I've seen far worse soldiering on! The poor hi-fi could be worn heads, although the capacitor change may well get everything going well. It's the right place to start, anyway. Glyn

18th Apr 2017, 10:14 pm	#9
Rennie93 Triode Join Date: Dec 2016 Location: Frankfurt, Germany. Posts: 32	Re: Panasonic NV-FS200 Power Supply I'm going to take a look and see if I can do it myself. Obviously with a PSU I'll need to be cautious. Worst case I'll take the PSU to a local tv/dvd repairer. Maybe they'd be prepared to replace the caps for me, even though they don't do VHS machines anymore. In this case I'll definitely pass on your recommendation for the Panasonic 105 degree parts. many thanks! r

18th Apr 2017, 11:41 pm	#10
IanNVJ35 Heptode Join Date: Mar 2010 Location: Hemel Hempstead, Hertfordshire, UK. Posts: 847	Re: Panasonic NV-FS200 Power Supply Some desolder braid and a nice quality iron like the 25 Watt Antex and you will do fine I'm sure. Make sure to use leaded solder as lead free won't mix (called reflow solder).