Forum Free Registration Closed
Granada Television Brochure, 1970s
Long Gone UK TV Shops
Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
Thorn TX10 Chassis
Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
Rumbelows
Thorn EMI Advertising
Thorn’s Guide to Servicing a VCR
Ferguson 3V24 De-Robed
Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
Ceefax (Teletext)
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
D|E|R Service “The Best”
The one that got away
Technical information
The Line Output Stage
The map
Tales of a newly qualified young engineer.
Tales of a Radio Rentals Van Boy
Sanyo SMD
Disastrous Company Rebranding
1969 Philips G22K511
Memories Of The TV Trade
Crazy house
Dirty TV screens
Dual Standard and Single Standard CTV’s
Radios-TV on YouTube
The Winter of 62/63
A domestic audio installation
1979 Ferguson Videostar Deluxe 3V16
Music centre modifications
Unusual record player modification
B&K 467 Adapters
Mishaps In The Trade
1971 Beovision 3200
Forum Free Registration Closed
Granada Television Brochure, 1970s
Long Gone UK TV Shops
Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
Thorn TX10 Chassis
Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
Rumbelows
Thorn EMI Advertising
Thorn’s Guide to Servicing a VCR
Ferguson 3V24 De-Robed
Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
Ceefax (Teletext)
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
D|E|R Service “The Best”
The one that got away
Technical information
The Line Output Stage
The map
Tales of a newly qualified young engineer.
Tales of a Radio Rentals Van Boy
Sanyo SMD
Disastrous Company Rebranding
1969 Philips G22K511
Memories Of The TV Trade
Crazy house
Dirty TV screens
Dual Standard and Single Standard CTV’s
Radios-TV on YouTube
The Winter of 62/63
A domestic audio installation
1979 Ferguson Videostar Deluxe 3V16
Music centre modifications
Unusual record player modification
B&K 467 Adapters
Mishaps In The Trade
1971 Beovision 3200
Ferguson 3173
At a bit of a loose end today so thought I would have a look at this set
I've been thinking of offering this set for exchange for a PYE set of equivalent age/ size
Without even touching it .
It's a Ferguson 3713 fitted with the Thorn 8500 series chassis
On removing the back cover I was pleasantly surprised on how clean & almost like new condition it is , no years of dust ,no nicotine stained plastic & no corrosion well the tiniest bit
It looked like it had just been taken out of the box
It makes you feel like just plugging it in & tuning in
What value?
Hi Malc,
There are 2 green smoothing caps that have leaked
The one you can see is a 700uf 250 volt
The one under the dropper is a 400uf 350 volt
I have 2 600uf caps & was wondering if I should give them a try
Chris
They should work fine. They will need to be re-formed before using them if they are NOS ones, Malc.
A good one Chris, looks to be a nice set
To understand the black art of electronics is to understand witchcraft. Andrew.
I've still got 8000/8500 power supply elcos in stock, real 1970s stuff, will need reforming before you use them.
Till Eulenspiegel.
Having reformed 2 nos 600 uf smoothing capacitors & fitted them
I then powered up but the cut out popped out immediately
Not finding any shorts around the power supply area , l decided to have a closer look at
The line output transistor , not short , but it was leaky from collector to emitter
Fitting a new one & replacing the 002 uf 2kv on the same heat sink
I then had EHT but smoke . R402 has burned up not having a manual for this set I'm not totally sure what it feeds .
It looks like it supplies w403 diode
Can anyone help ?
Chris
.
CrustyTV Television Shop: Take a virtual tour
Crusty's TV/VCR Collection: View my collection
Crustys Youtube Channel: My stuff
Crusty's 70s Lounge: Take a peek
Thanks Chris
C401 dead...?
Not related to the current fault, I've also read that on the same panel you should check R404 33KR 1W as it frequently fails. It feeds line pulse to the decoder. Apparently later boards had a wire-wound resistor in this position.
Don't forget all the 8000 stock faults apply to the 8500 of which your current fault was included https://www.radios-tv.co.uk/brc-8000-stock-faults/
CrustyTV Television Shop: Take a virtual tour
Crusty's TV/VCR Collection: View my collection
Crustys Youtube Channel: My stuff
Crusty's 70s Lounge: Take a peek
Replace R402 & W403 as a precaution but the fault was traced to the red A1 pot had tracked across the back
Now I have a raster but out of focus , looks like the focus unit has failed
Or the EHT rectifier tray
Chris
If its the EHT tray I have plenty in stock, if you need one you're welcome. The focus units on these sets are dire after all these years, "Thick film" types.
I had the same defocussed fault with my focus unit, had to buy a new one.
CrustyTV Television Shop: Take a virtual tour
Crusty's TV/VCR Collection: View my collection
Crustys Youtube Channel: My stuff
Crusty's 70s Lounge: Take a peek
The tray is a common cause of focus problems on the 8500 it was the first part that failed in my parents set it was about 4 years old at the time.
I had to change the LT smoothers last year as one suddenly went o/c while I was watching it.
That looks like a nice clean low hours set. I have yet to have a look at the one I got from Neil but somehow I don't think it will be as nice as yours inside!
Rich.
Is the focus unit a standard type or a special to this set
The reason I ask this is I tried a focus unit but made no difference
Chris
I had a load of NOS focus units in stock that looked identical but failed to work, this was due to them having varying resistive properties. The ones I had were not compatible with the 8500 despite outwardly looking the same.
Beware all focus pots that fit this set despite appearance, are not equal.
I had to buy the specific one for the 8500. Unfortunately they are now out of stock from where I bought them. I will see if I kept the data for it.
Edit: Also check the focus spark gap on the crt base it may be leaky I had that exact problem on another, using the megger I found it.
CrustyTV Television Shop: Take a virtual tour
Crusty's TV/VCR Collection: View my collection
Crustys Youtube Channel: My stuff
Crusty's 70s Lounge: Take a peek
The 8500 Focus unit must read as follows:-
Between the left hand pin (+) and the start of the wiper track its needs to measure 17.6 M ohm
The wiper track itself should measure 30 M ohm
Between the end of the wiper track and the right hand pin (E) it should measure 26 M ohm
CrustyTV Television Shop: Take a virtual tour
Crusty's TV/VCR Collection: View my collection
Crustys Youtube Channel: My stuff
Crusty's 70s Lounge: Take a peek
Thanks for the info Chris
I'll give it a go with some measurements
Chris
- 33 Forums
- 7,941 Topics
- 116.3 K Posts
- 6 Online
- 331 Members