Sony TA-F440E (F540E) amplifier with mysterious faults and a history.
Вставка
- Опубліковано 27 січ 2020
- Working on a Sony TA-F440E (F540E) amplifier which appears to have been "got at". Why has someone done a horrendous hack to this amplifier and what was the original fault that they were trying to work around? Sony released a terrible service manual with errors and lack of detail.
Audio and video transfers: www.video99.co.uk/
Please support us on Patreon / video99couk
or Paypal to colin@video99.co.uk
Music “Let It Run” with permission, copyright Cristie/MacFarlane. - Наука та технологія
![Lp. Последняя Реальность #107 РОДНОЙ ДОМ [Финал] • Майнкрафт](http://i.ytimg.com/vi/IK3QKzKUlHM/mqdefault.jpg)
Well done colin, that was a real pain.
A sneaky thing they might have done is put a spring plate between the back panal and phono earths, but that could have been removed by a past pillock.
I have never seen an amplifier with that problem, how odd.
I suspect the original fault was a manufacturing defect, but we may never know. There certainly was a past ... erm.. person involved here, who was out of his/her depth.
I'm no lover of schematic mistakes eather, they have sent me mentally spinning in circles a few times over the years.
Out comes the correction pencil.
Interesting video, quite a challenge working out what was wrong with this amplifier. I first thought those problems would be due to bad solder joints, I have worked on several Sony amplifiers of this age over the years, and all of them had bad solder joints, caused by Sony not applying enough solder in the factory. However I can not imagine they would have simply forgotten that wire link at the factory. I think the grounding originally was connected through the RCA input jacks, but who knows what happened to that when those jacks were modded...
Spontaneous Twin Bodge!
Good repair, I hate it when you get a bodged up piece of equipment on the bench, it takes ages to work out what the previous 'repairer' was trying to achieve, then repair it properly! I have a vintage amp awaiting repair, a quick look has already proved someone has been in before.....
Can you provide safety precaution advice when dealing with high voltage amplifiers prior to the repair? Like how do you discharge those large capacitors?
In this case the capacitors are relatively low voltage because it has a linear power supply. Generally I discharge capacitors with a resistor of a few hundred ohms or so. I don't like to see sparks when discharging capacitors.
I bought yet another Video Recorder no surprises there, Built like Tank a Sanyo VTC 9300 Betacord very good condition. It only needed a new belt kit idler tires etc and new pinch roller and a good clean it also came with original pause switch wired remote control and manual, However it uses an AC Washing Machine Motor HAHAHA, To drive the head drum and the capstan pully loading ring etc, A bit like your TOSHIBA Beta you fixed a while back, Apart from the self driven Sony I think not sure head drum.
Years ago I ditched a working one of those. I regret that now.
Well that was facinating from begining to end, a veritable "Who done it" a-la Agatha Christie: how long were you actually working on the machine in total ?
Many thanks Colin,
There's a clue in the video. Every so often you hear my watch chime the hours. I edited down 3 hours of video and did about another hour without the camera.
The phantom bodger AND manufacturing defects to deal with! Makes you wonder if it was a defective unit exchanged under warranty, but the repair shop decided to make a little bodge of it and use it in the workshop! Your guess is as good as mine!
That thought crossed my mind when I saw that "110 degrees CRT" label. Up to that point I thought it was probably the previous owner had bodged it up.
I would have reversed all the cut and mods traces and botched areas first , and then fault find
hi that the thing with all audio gear you don't know the time line of the gear and what's done to it i just put to motor in a portastudio deck easy to fix funny
thing it came from a tec a dealing in port a studio's he fixes them up i never seen that model before i fixed it so easy job help of a toy audio kit test gear just used
to get the playing speed right amp are not things i work on
A Tascam 4-track cassette Portastudio? I've been looking for one of those at a sensible price, since now I have an Alesis HD24 multitrack digital audio recorder I could connect it to. Let me know if you come across another.
hi it john he the one who doing all the spare
for the portastudio's i know this man i am on first names i know this plans it's all go news yes you know the name by now
this is why the prices gone high john's
got some that need work you could
get one of him and fix it up in a video
and do 15 min video's pt 1 -2
would get the money in not a lot tp lose
john got 40 of them i talk to john 5-10
time a week a lot watch video's on them
i checked
@@bobjerome5390 Alas I don't make any money from UA-cam, but it would be interesting to do one up. If you come across one that's sensibly priced, please send me an email via my web site.
the mod done is wrong you need isolation from chassis to input ground to prevent ground loops
"mysterious faults and a history."
IT'S A SONY - so no mystery at all. Not a good manufacturer.
I'm not sure you can make such a sweeping statement. Sony had the professional video market sewn up for decades, due to excellent quality, ease of maintenance and after-sales support. Every time JVC or Panasonic tried to enter the professional video market, it all unravelled very quickly. MII format for example, or DVCPRO.
@@video99couk "Sony had the professional video market sewn up for decades" with broadcast cameras that fell to bits because you looked at them.
1980 Bought a CCDV100E - great camera. Tape deck died on it.
Power amp speakers & tuner. Amp now iffy, Tuner lost the plot, speakers ok.
CCDV500E (2nd hand) Dodgy power switch, tape guide fell out of the deck.
EVS800 x2 both faulty. One was returned twice to shop for repair 'as new' - it's still not fixed following Sony's collection from my house following a letter to Akio Morita at the time.
Nothing Panasonic of an expensive nature has failed at all.
Sony stuff is a joke.