I think you "missed" those joints intentionally so that you could give a more-detailed overview of the system and other possible faults. It's more fun this way. Thanks.

@EEVblog

4 жыл бұрын

Err, no, that's not how I do things. I record my videos in a linear fashion as things happen, no plan, and voltage measurement was the first thing i wanted to do. I initially thought (hoped) it was a component fault I could track down. So the joints only became the next suspect when the voltage measurements pointed to internal IC voltage bias problems, and then the penny dropped it could be that. You can't see these cracks with the naked eye, so I had to use my macro lens or my Mantis to see them, not something I'd ordinarily do first.

@cuteswan

4 жыл бұрын

My bad then.

@punker4Real

4 жыл бұрын

Now the radio strip is out of sync with the cog wheel DOH! 4:55

@tomadkins2866

4 жыл бұрын

@@EEVblog Apologies Dave, I thought you might have noticed the bad joints earlier on, also. Mea Culpa, sir.

@EEVblog

4 жыл бұрын

As I said, first thing I do is comment on the design when opened, next step look for basic visuals (requires microscope to see the cracks), next measure voltages. In this case the voltages pointed to the chip, so visual inspect closer and bingo. Standard procedure. Take out my camera stuff and commentary, and this was 5 minutes of actual work until fault spotted. To find it quicker would require specific product failure knowledge.

I wish providing service manuals and making stuff repairable was still a trend. It's awesome to see that there even is a service manual and all that info it has, and for the product to be easy to work with.

"That's not a screwdriver... THIS is a screwdriver!" Also surprised to see a service manual for a fairly modern consumer bit of gear. Impressive.

@TheWalkmanBlog

4 жыл бұрын

I see you've played screwdriver-screwdrivey before

@tomadkins2866

4 жыл бұрын

.

@GoldSrc_

4 жыл бұрын

Back in the day, you could get the service manual for even the most basic consumer tv.

@tomadkins2866

4 жыл бұрын

@@GoldSrc_ I have a full set of Sams Photofacts from 1946 to about 2004. :)

@daic7274

4 жыл бұрын

@Lassi Kinnunen would most likely have been borderline late 80's early 90's, after that decent (if any) service manuals started to disappear. Also as a side note, that solder looks like some of the early attempts at lead free crap. I have seen almost entire boards of that era with dry joints, quite often coupled with oversized holes for the component legs.

"Drier than a dead dingo's donger! " I laughed, I cried, I was moved. It has become a part of me.

@HDXFH

4 жыл бұрын

Brian Sullivan dick smith reference

@CyberlightFG

4 жыл бұрын

You ate it?

the black cover in the battery compartment was probably for a different model that had a built in clock, they usually had a spot for 2 AA batteries in there behind the d cells. they probably reused the rear casing.

@EEVblog

4 жыл бұрын

Ah, makes sense.

@ralathr

4 жыл бұрын

I don't think it was for anything like that. Instead I think it was for plastic molding. They needed a way to create an opening in the molded parts so sound could get into that port that goes to the front. To do that the mold tool had to come up from the battery compartment side into the center of the radio. They used a "label" to seal things back up when they were done.

This is a CLASSIC issue, power device mounted on a heat sink/expansion contraction. I have also seen this on an old high voltage TV transformer in a Pioneer large screen projection TV. Had to re-solder on several occasions but was the only failure ever on the TV itself! Great repair video.

Thanks for the video, Dave! My wife and I really enjoy your colloquial turns of phrase. "Bob's your Uncle" is hysterical. I found this video because I just happened across a "Winner, Winner Chicken Dinner" pretty complete CFD-565 that's going to need new tape transport belts. I wanted to get one "portable/boombox thing" for travel purposes, should that need arise (it probably won't, but restoring this stuff is my retirement hobby) and I owned a "Fish" brand box back in the '80s. The CFD-565 was fairly inexpensive considering how "overbuilt" it appears to be. It lacks Cassette Bias/EQ settings, tape counter, and the like, but it seems to be much better built than some of these eye-poppingly hyperinflated boxes. My question (I'm in the U.S.) is why don't Sony boomboxes get more respect than they do? I think their specs are held to a more conservative standard than some of the "45wpc" cash register/calculator manufacturer machines out there, so I just don't get it. But then I wasn't really part of the youth culture that fetished the park it on your shoulder and turn it up phenomenon. I sold a bunch of them to those folks in the '80s, though. What am I missing? $3K for a no-name knockoff? Help me out a little...best regards!

3D print some new knobs and you really have a winner. Well done Dave, that took me back to my techie days

I repaired consumer electronics right outta school like this, I gotta say it was quite enjoyable and generally speaking easy to troubleshoot and repair

As a kid I remember excitedly pulling apart my Silver branded boombox which had 80W PMPO proudly emblazoned across the front only to find a couple of small paper coned full range drivers rated at 3w each. Put it back together and sulked for a while!

I love these repair videos. We learn so much about product design, even better than a tear-down.

That eev blog multi meter is a must buy!

Love these kind of repair videos. Thanks Dave.

You remind me of Steve Erwin. So much energy and passion for your work. Thank you for sharing.

That thing is a blast from the past. I used to work for a Tandy Electronics store in 1998-2000. I remember selling that exact model.

My experience level just increased substantially from watching this vid. Thank you!

@EEVblog

4 жыл бұрын

No worries.

A great fix. I always liked Sony gear and the availability of manuals.

Touching up cold solder joints has never failed me. I did it to an old 1980s ghetto blaster boombox the Magnavox D8443 because the audio power output was very low and cutting out and I touched up the solder joints on the main capacitor and a few dozen other joints and the radio works much better. I am in the process of restoring this set as best I can.

This kind of videos is the most educating and entertaining :)

Excellent video keep up the good work!!!

My favorite type of video Dave! Thanks for this one! :) I learned a lot here.

Good job Dave. We see lots of mailbags and tear downs, but not many repairs - good to see for a change! 😊

Your "long range" screwdriver is blowing my mind. It's a beast! :-) The size is absolutelly matter! :-) :-) :-) Greeting's from Poland :-)

Dave discovering the AC/DC switching made me chuckle. We had a lesser model as radios in a casino I used to work at. They took a LOT of falls from six feet up. What usually did them in was too many face-down smacks to the volume pot or mode switch. Nearly every antenna got broken, but we used paper-clip chains Scotch-taped to the wall. They actually put out a decent quality of sound in small rooms, the Bass Boost actually worked.

That was great Dave. And is why I love working on this type of stuff. Always dry joints or faulty caps in these.

I restored a Sony FH-100W mini hifi last year with APM speakers etc from about 1986 and yes lots of bad solder joints but wow it does sound amazing now.

God having service manuals makes repairs so easy.

Omg. This same model sits in my desk right now still working!

@jacksoncroyce6063

4 жыл бұрын

Check the joints!

@marks47

4 жыл бұрын

@@jacksoncroyce6063 Someday, he'll have to spend more money on a screwdriver long enough to open it than he will to fix it.

Dave pretending he doesn't have a Kylie CD in his top drawer. 😊

@EEVblog

4 жыл бұрын

I should be so lucky

@ianphilip6281

4 жыл бұрын

@@EEVblog Dave you just made me grin like an idiot.. again. That and the laughs in the video.. good job my wife is tolerant. ;-)

@aksting

4 жыл бұрын

With a signed pinup as well.

Always interesting to see repairs on your channel =D

Tech Tip: You'll need to 'sync up' the tuning mechanism before you re-install the front!

@beyondhelp00

4 жыл бұрын

I watching that thinking exactly the same lol.

Good job Dave 👍

I think the word you're looking for the "80's boombox" is "ghettoblaster" :^)

Good find Dave

LOL Dave I just fixed my Mum's Sanyo boombox last week. the cassette works great once again.

Dave, I did warranty service of Sony products during that time period. Sometimes with certain models of Sony or other brands out-of-the-box, there were cold solder joints mainly on those components that are heat-sinked. Like you said, a bad batch of solder or too short of time through the wave solder. Before I was laid off in 2001, there were a lot of solder errors in certain models of many brands that came out that year. The muxes were fine, it was the heat-sinked components. Remember, a lot of the circuit boards were made by a few contractors for these brands, so you can see the same boards in these Japanese brands. The first thing I did with these models is to open up and check the solder joints to these components.

This was a really nice troubleshooting video. Thumbs up :)

Grate video Dave. Thank you.

The radio tuning indicator should have been lined up before the radio was reassembled! Great video anyway, I used to get those from the scrap yard and fix them at home, sometimes I was very lucky and all that was needed was a jumper wire for a blown fuse or replacing a transformer because some of them have internal fuses. We have 2-phase power utility in most homes and people sometimes forgot to flip the voltage selector switch before turning on the radio.

You can resin cast a copy of the missing knob from the working one, if that sort of thing gets on your nerves. Love your repair videos

@speedsterh

4 жыл бұрын

Or you make one (roughly) with epoxy paste. Or 3D print one

I sure do enjoy watching a real tech fix things!!! So many now either throw parts at it or just throw it away... You and Mr Carlsons Lab are my favorite tech with a shoutout to BigClive ;-) Well done sir and your mom's gonna be tickled as well :-)

@awesomeferret

4 жыл бұрын

You would probably get a kick out of Louis Rossman too then.

Makes me remember that good old days i was 15 ( in 1995 ) repairing similar kind of boomboxes , TV´s and spicas for neighbours , with the money i bought an Atari 65 xl , programming since then ...

@EEVblog

4 жыл бұрын

Nice!

Nice fix great job.

I love your troubleshooting

Another device saved from the trash heap. Good work!

Excellent. I liked all of it.

Love it, I have one that is the same vintage with a digital tuner and I loved it but it failed with no sound. After seeing this video I'm inspired to get the service manual and see if I can find the failure mode. It had good sound and was the only one that had an alarm where you could set the off time separately from the on time, fancy.

'Dry as a dead Dingos Donga' - David L. Jones 2019

@pesho9971

4 жыл бұрын

you must be a new subcriber :D

@goatfighter80

4 жыл бұрын

this is the Ducks guts', 'half a bees d*** more expensive' lol

@TweakTechNow

4 жыл бұрын

'Half of a bee's d*** more expensive' - David L. Jones 2019

@NanoBurger

4 жыл бұрын

I want that on my gravestone.

I love these videos.

Louis Rossmann would be proud of Sony

We are building a fighting force of extraordinary magnitude. We forge our tradition in the spirit of our ancestors. You have our gratitude.

It would have been great to see the repair happen on those joints, otherwise what an amazing video. Very informational. Thank you for all you do.

Hey Dave - How many attempts did you make to get the Radio Tuning Indicator aligned to match the Tuning Capacitor position? - Chris

Dont forget the mechanical stress. Those solder joints have to support that big honkin heatsink and being a boombox it gets tossed around quite a bit. I had similar issues in guitar amps back when I was into that sort of thing.

Your mom will be happy and proud of your work ... 450 mm screwdriver ?

@Rainbow__cookie

4 жыл бұрын

Wow 450mm

@menuly

4 жыл бұрын

Its made to reach the two screws holding a TV on a wall mounted bracket.

@mrnmrn1

4 жыл бұрын

@@menuly From the other side of the wall, or what? :)

@menuly

4 жыл бұрын

@@mrnmrn1 underneath vertically.

Very good and nice video. I like it 👍

Found this one extremely interesting I have a few like this but mainly Panasonic

At minute 22:15: Very good to see the crack in the solder. This probably occurred more often on PCBs with a single side copper layer. Even if the component was not mechanically screwed to the PCB separately?

man this is awesome. we had this very same tape deck when i was like 14. i had no idea it was built to such standards. i always assumed it was just a chinese simple cheap thingie. no idea you could get a freaking service manual for the thing & everything. as i recall it did its job and never failed.

I can't belive you've never seen those AC/DC switchng power sockets before, they've been around since the 70's on crappy mono cassette players!

@jam99

4 жыл бұрын

One must remember that, 'and that's all she wrote' and 'nothing much going on there', is highly subjective to one's own life experiences!

@therestorationofdrwho1865

4 жыл бұрын

Yep I've got one of those and it has that socket.

Missed it by that much!

I've seen the same thing on CRT monitors. The joints on the flyback transformers crack in the same way. Heat and vibration does it...

@cambridgemart2075

4 жыл бұрын

@@blitzwing1Yes, lead free is worse for this

Love seeing a repair from start to finish.

I had a Grundig branded tube-TV and it came with the schematics and all out of the box.

Hi there, new subscriber...This made me think of the Yamaha DSP A1 Amplifier that has the dreaded display pixel disappeaer. Almost all of these amps now have the display miss pixels, I have fixed over 10 of them so far, requires resoldering 32 pins on the top and bottom the display, the joints do excatly what happened here to this Sony Boombox. Great find and good repair job!

I would be checking electrolytics that are in audio sections for DC blocking, such as C252 and C192

"Bad soldering joints" is the most classic detective movie.

Not just power devices. Connectors too. Had this on a 1997 Dodge Caravan Minivan a couple months ago I was working on for a friend. Went in to fix a speedometer issue... but then I was told "oh, the gauges completely die somtimes too". Pulled the instrument cluster, sure enough, all but three of the connector pin joints were cracked. "easy" fix since I had the cluster out anyway. Seems to be a common issue on GM and Chrysler stuff of the era (luckily, Ford used film PCBs that don't have such issues; I can't speak for non-USA makes).

@zuestoots5176

4 жыл бұрын

Honda had issues with the main relay soldier joints failing through out the 90s. Random stalls and long restarts are a good clue

17:30 A remnant of the old tube days, the B+ voltage regulator :D

I like the part where you fixed it. That was the best part

haha disassembling this type of boombox was always a nightmare, screwdriver was always too short !

6:40 - The asymmetrical placing of the foam is probably to reduce standing-waves.

Those tape drives are pretty good

I have one of these and modified it with an aux input. I found it in the rubbish room of a large apartment building.

I'm working on the cassette mech on a Sony CFS-9900 boombox 1985 atm. What a pain in the arse to fix but almost 100% fixed.

I had the US version of that boombox growing up. I had forgotten about that thing.

please put subtitles in Portuguese! Many Brazilians will assist your channel and this will help to have greater visibility in Brazil.

Funny, I have the same one, CFD-V15, here which someone had thrown out at work a few weeks ago and I hadn't gotten around to looking at until seeing your video. One speaker is completely FUBAR and the tone control knob is missing but other than that it seems OK. Thinking I might just harvest the AC transformer from it as I always seem to need them (hopefully it's a dual secondary winding).

My grandparents have one exactly like this! Now I don't have to take theirs apart. :)

In america the front was completely in black. i used to have this exact similar model.

Goes to prove that most repairs are pretty straight-forward to accomplish.

1:17 - I'm guessing the filter cap 'formed' during the interval between when you powered it on (probably after many years) and when you started adjusting the volume! Anyway, that cap sounds (literally!) like a candidate for replacement. No need to swear, Dave! (1:35), you have video and audio evidence!

Haha I really think that those solder joints resisted more than constant daily cooldown jaja Maybe the aluminum structure did this because of weight, and physics. haha Like always your videos are pure gold. So much more interesting than watching series or movies. A hug!

Indifferential thermal expansion could cause the solder cracking, this would be the pins expanding or contracting at a different rate than the solder when heating or cooling.

Rock on

Maybe the sticky bit was to control the resonance of the batteries at high bass volumes?

Hope you put the one remaining control knobbie on the volume pot instead of the tone one...

and thats why my stereo amp of 25 years is still working as good today as it did 25 years ago, I never switch it off.

I think that foam is only to stop vibrations, not for acoustic absorption. The battery door was right opposite the bass port internal mouth where there will be high velocity air. I expect it just damps the door.

At last a repair on the EEVblog instead of just laughing a busted gear.

That foam seems like an educated guess into a tongue at the right angle sort of job.

AM radio is were the truth lives, Dave!

Thumbs up!

I'm really surprised to see those big expensive caps on the speaker connections. For single rail designes it makes more sense to use a bridged output amp that makes the DC bias common mode across the speaker coil.

17 inch shaft, not much in the way of girth but impressive nevertheless

@redsquirrelftw

4 жыл бұрын

Good enough for the girls I go out with!

My parents have bought me one, same like this, I believe, in 1998 or 9 (I was 5 or 6 at the time), and two CDs of Bob Marley with it.... still have the player and the CDs and they all still work... The CD pickup is almost dead though, and the switch for AC/DC that's integrated into the socket has to be extra pressed with a piece of folded paper to work.... I've always wanted to fix it, but I've not yet bought a long enough screw driver to reach those deep back screws...

Oooh! Boombox Repair and Taredowns.... Love it! Oh! The cassette deck erase head is a permanent magnet type! Yeah I guess that it's at that time when manufacturers were deliberately killing off the Boomboxes and making them as cheap as possible...

Fake-tweeter: I've seen some models where the low-end exterior was simply the high-end exterior with a few holes not cut out. (instead of simply looking for the tweeter 'dip', I would check if the tweeter magnet/core was visible)

6:50 - I am thinking they may have done the asymmetrical foam job in order to eliminate high frequency standing waves?

11:36 I believe that the wave solder was gone from bottom to top and the profile of the pointed chip doesn't matter. They weren't able to do this with four sided chips so they placed them on 45 degree