JC44-00178A. That's the whole board part number from Samsung. I worked at Samsung more than 10 years ago, and i changed those power boards under warranty like crazy. That part number was archived in my memory and this video retrieved the data 😅. Thank your Mark for your old and new tech videos. Edit: Wow! Double thanks for the pin post, greetings from Colombia, you and master Ken are my heroes!!!

Those aren't *bad* capacitors, those are *evil* capacitors.

It's amazing how much you can extend modern product's lifespan by just recapping. In the kitchen I have a ramp of 8 cheap GU10 RGB radio controlled spotlight lamps that all died within less than a year. After replacing the only cap that I could access, they have worked for 8+ years.

@docnele

Ай бұрын

I have HP2200 dual-sided printer 23 years old. It had a problem with rotating mirror bearing that went dry, but I managed to lubricate it. It is a little denser oil so it needs couple of dry runs if outside temperature is low :) It is thin plastic that went brittle, I broke some on dismantling it, but those were some holders and brackets so I managed to glue them together. There are Win 10 drivers. Thing is a tank when compared to modern printers.

@rocketman221projects

Ай бұрын

Good capacitors will last a long time, especially if they are not mounted right next to heat producing components. I have an Astron power supply that's 40 years old with all original, US made capacitors and it still meets its output ripple specifications at full load and minimum line voltage.

"Crapacitor" is a good word

@TheDefpom

Ай бұрын

yep, that is coined from me... I sell a shirt with it on too 🙂

@Zadster

Ай бұрын

But not, in this instance, Tantrum Crapacitors

Wow Marc fixes something that was built in this century ;)

Laserjet 5 here. Got it for free, not working. Replaced the fuser assy and the drive gears, both readily available from printer repair places on the web. Added more RAM, and got a network interface card off eBay for $15. When I ran the test page, it said 330k pages through it, and the repair place I talked to said they can easily do a million. NOS sealed cartridges for $25 each off Goodwill means it should outlive me. Not *all* HP printers are evil, this one dates to the 1990s, when HP was still building good gear. I am a firm believer in buying good commercial quality gear that's been superseded but is fine for home use.

@Damien.D

Ай бұрын

Can't agree more but we shouldn't talk too much about how good old HP laserjet printers were. Imagine if everyone buys them and price skyrockets? ;)

The printed page was your opportunity to print 'Like And Subscribe'! We had to go back to our Chinese monitor supplier and have them change the backlight voltage boost cap from ChingX to Panasonic... no more problems! If your monitor is having backlight problems most likely it's that 100v cap on the backlight board. Always love seeing someone repair their stuff.

The HP 4100's were magnificent printers. As were the A3 Colour 4500's. Complete workhorses, never had any problems with them.

You even make mundane repair videos very entertaining! You are my #1 favorite KZreadr!

I’ve been running an HP LaserJet 4050 since the late 90s with no trouble until a month ago where it would jam if asked to print more than one page. It was exactly the same solenoid issue!

@gorak9000

Ай бұрын

4050's are tanks - my favorite printers of all time

Bad that crappy parts or parts with aging issues are being used - good that folks are documenting the fixes. I switched to Brother printers several years ago at the advice of a computer consultant friend who works with tons of printers and saw Brother having the best track record. I was a loyal HP LaserJet user for many years but their software and hardware quality went into the toilet. The Brothers have been very reliable and my 15 years old All in One MFC-8890DW which saw heavy use in a CPA's office especially during tax time then graduated to my home office is still going strong. Consumables are much cheaper and easier to replace as well.

@CuriousMarc

Ай бұрын

Yep the "modern" HP's use the same crappy solenoids and capxon green caps. Who knows, they might be made by Samsung (or vice versa). Thanks for the heads up on Brothers. Hope it holds up for you.

@SeanBZA

Ай бұрын

My newest HP is a p1102, and I have a P100 that I got for free, only needed a $15 aftermarket cartridge, and a clean of the paper path. Serves my print needs well, and for scanning I have a nice Scanjet 3400, and a backup Canon as well, both gotten for free, because HP and Canon stopped supporting them after XP, but SANE does not care, and so long as they speak Twain it will work with them.

@TheStefanskoglund1

Ай бұрын

What i hate with my Brother is: faulty out-of-toner sensor ie bitches about toner and the toner cartridge (not the drum unit) is expensive in sweden (upwards of 60 $ if you want to buy it at a 'mall') A complete unit with drum is even more dear....

@SeanBZA

Ай бұрын

@@TheStefanskoglund1 Take a trip across the border, or order on line and get it cheaper then.

@user-sd3ik9rt6d

Ай бұрын

I've had success with Brother printers, and the off brand toner is cheep.

We purchased an HP Lj3 around 1991 originally used as the office laser printer. Eventually, when we bought an Lj5, it was demoted to a check/special paper printer and after that was made a printer for a single pc. We got rid of it around 2008 when the paper feed mechanism finally broke. It never needed repairs.

looks like a flyback converter. those output capacitors just absolutely hammered because they are charged up half the time and are discharged the other half (well, depending on duty cycle technically) at 100KHz or whatever the switching rate is. So that means there is the potential for amps of ripple current- continuously. Nothing like opening up a TV and seeing the domed caps- but better yet there's empty capacitor footprints where they cheaped out! usually I will fill the empty spots with some more capacitors to spread the ripple current. using high quality caps helps, too. Even though they used cheapo caps, it's a combination of the cap quality, the high temperature (TVs and similar generally have little to no cooling and usually no fans or active cooling) and the ripple currents. all three of those things conspire to dome the caps.

I had to retire my HP Laserjet 6mp last year after nearly 30 years in use as I could not get anymore reliable cartridges for it. Its page count was over 1 million.

At least modern electronics has the nifty indicators that pop out on them.

Almost dropped my vodka when I saw Moscow newspaper in the vid ))

I have an old Kyocera laser printer. It had the same issue with the sticky foam in the solenoid. I fixed this - and that was already about 10 years ago. The printer still works. The sticky foam issue is very common.

@docnele

Ай бұрын

The same problem was on HP 2100 series, and I found at a time that all customer printers were plagued with it (it was hundreds then!). The best thing that there was no foam on the solenoids in the service manual, but they were too loud without it. So I went to the store and got some thin kitchen sponges for surfaces and glued pieces of it onto the solenoids. They never came back to repair because of solenoids.

@clark9992

Ай бұрын

Yep, I had to do it to all 3 solenoids on a Kyocera KM-1820. Also, the HP 4250 and 4350 not only have the sticky foam on the solenoids, but on the registration roller assembly, and on the delivery assembly flags as well.

@orbitingeyes2540

Ай бұрын

Almost as bad as the Sony potting glue in my older Kenwood radios - it absorbs moisture and detunes circuits over time. Took 10 hrs of involved surgery to get it all out!

Laser and Inkjet are great and all, but I do miss my old tractor feed ESC/P 9 pin dot matrix sometimes, it was far superior to the ZX Spectrum thermal printer.

Although repairing printers might be slightly off topic, I still really like this content. Opening up a device, searching the fault and fixing it. What else could one wish for?

The previous solenoid repair is interesting, as I recently had to do the same on my HP Laserjet 1320 due to sticky solenoids causing a jam in the duplexer. To be fair, it was 19 years old at the time that it failed.

Solenoid: Had the same problem on a HP laser printer. But you MUST put something isolant otherwise when the solenoid is activated, it stick one or two more seconds after solenoid power off because you close a loop around the coil. It drive me crazy before I understand what's happened 😆

@docnele

Ай бұрын

I used cloth sponges glued to solenoids on HP2100 :) Also, the paper drawer would eat through the plastic seats because of hunreds of openings. I would glue aluminium inserts into the drawer seats to add for a missing plastic on the front so printers could draw paper again.

@PublicRecordsGeek

Ай бұрын

Furniture felt pads. The little feet for music boxes same size as pad. Remove ALL old glue first.

Ahhh, I wish I knew awesome electronics repair people like you guys in my area. Such critical knowledge I’d love to absorb.

Yep, it's against company policy to fix things properly!

That PCB is getting crispy; an air gap between those power resistors and the board wouldn't hurt.

Another great video Marc, thank you for sharing. It's so annoying that a company the size of Samsung resort to using cheap "crapacitors" from China, rather than quality components. I guess this is what happens in corporate companies, when the marketing and finance 'men in suits' have the final say over engineers. I wonder how many of these printers (or Samsung products in general) have gone into landfill or e-waste due to this penny-pinching. There are a lot of people out there that wouldn't be able to make this repair, nor afford someone to do it for them.

Samsung printer that makes me think oh Brother here we go again 😂 4:50 those resistors get quite toasty it seems. Some scary voltages in there, think I'll stay away from repairing laser printers😂

@retrozmachine1189

Ай бұрын

They used to be more bitey but ozone reduction techniques lowered it. At one stage there were even conductive foam rollers to charge the drum in some printers rather than the charger grid. Not sure if that's still a thing. They used 'only' hundreds of volts instead of kV.

@Zerbey

Ай бұрын

I've had a Brother laser printer for a decade now, and the only thing I've replaced is the toner.

Brilliant! Well done!

Side note, while the old Laserjets are well nigh indestructible, they are not immune to the mid-90's capacitor plague. My 1994 LJ4+ had a few leaky caps that had time to damage some PCB traces... With this solved however, I fully expect this machine to survive another 10-20 years

Ah yes, I've seen this sort of fault in several Laserjet 4Si printers. The factory fitted pad was open cell foam and over the years it was crushed flat so that the adhesive was exposed and caused the arm to be slow to rise in turn allowing the pickup clutch to be engaged for too long.

That’s fast! I just ended watching the giant floppydiskdrive repair!

Just recently had exactly the same sticky solenoid problem in the paper pickup in my HP Color LaserJet 4600. Same fix, of course. It makes a slightly louder click when the solenoid energises but I actually quite like that! My old workhorse LaserJet 4M+ needs some TLC, though. It's printing dark-grey on light-grey (actually more like two different shades of mid-grey now). I think it may be something to do with the high-voltage PSU.

i had a similar issue with my mother's Epson ecotank. It wouldn't power on and i had a look at it. Lo and behold the power supply had burnt out. We had and identical model in storage and it had software problems so it took it's power supply and put it in my mum's one and boom, it worked. I tell u the Epson printers are so easy to repair, all the parts are modular so 1 connector and 2 screws and out it comes. I think one of the transistors overheated. I would have liked to replace it but here in South Africa electronic components are jolly expensive when not bought in bulk and as electronics are just my hobby i can't afford it.

that samsung printer did sound happy!! 👌 very nice repair!!😊

My HP LaserJet 4000N from the mid 90s is still going strong and I've run many boxes of paper through that thing. It is a workhorse!

@fugelkusch3722

Ай бұрын

Kyocera turned out to be the new HP laser printers. Indestructable.

@PublicRecordsGeek

Ай бұрын

I bet you never used a jetdirect card in it at all

@chrisburns2172

Ай бұрын

I miss my HP 4250n. I got rid of it during a move and have regretted it ever since.

@mistermac56

Ай бұрын

@@chrisburns2172 a workhorse of a printer. Easy to repair and maintain.

@Damien.D

Ай бұрын

Got a 4050N for free. Only had to add a network card. Printed me hundreds of pages with the toner left inside when it was discarded...

I have the little brother ML-1910 with only USB which is working reliably to this day since 2010. But if it ever fails now I know where i have to look :)

The sticky damper is a feature of most laser printers.

I love my ML-2525W. I must have had it for close to 10 years and it's even been thrown down the stairs (about 5 years ago and not by me) and survived to print perfectly, even if the front panel is held on with Virgin Atlantic packing tape LOL

@BilisNegra

Ай бұрын

Another amazing fact is that at some point during that period your printer has turned into an HP printer (in a way).

I've owned an ML-2525W for probably over 15 years now and it still works flawlessly. I don't use it much, in fact it's still on its original "starter" toner cartridge! The big benefit of a laser for me is I can use it once or twice a year without the ink drying up.

My everyday office printer is a Kyocera kx255 (unknown age - bought used with 200,000 copies) and am at around 300,000 copies - only consumables had to be replaced - tober, fuser etc. I suspect it to be 20 years old - good quality equipment lasts a long time.

Nice information sir 👍👍👍👍👍

Thanks! You've given me the inspiration to replace some crapacitors in a modern audio amplifier. But surface mounted, ugh.

@SeanBZA

Ай бұрын

Still easy to change. Unless it is Sony, then it is a real pain.

Samsung: We know about the issue, we just don't care.

@DumahBrazorf

Ай бұрын

That's actually a rebadged HP printer. I repaired a ML-1865W with the stuck solenoid, a pain in the butt to disassemble.

Apparently optical detectors fail as quickly (or more) than capacitors. That's what turned out to be the problem on my Brother printer that suddenly decided it had a jam even tough it was smoothly feeding the paper through. It would stop with the top of the paper getting cooked by the fuser, claiming that the paper never made it that far. It turned out to be one of those optical detector units on a nexus board. So far no sign of cap problems yet, but with a new sensor it's back in action with no complaints.

I like that you also do crapnology. At least it was modular enough. The contrast between this and the old, exquisite stuff is amazing. The saddest thing is the total disinterest of today's companies in the life of their products after the warranty period.

Had the exact same cap error on my Samsung. Replaced one cap. Worked fine for a while then I guess other caps failed too so I bought a new printer. Might take a look at it again.

I love that he fix the same issues that I have with my printers but half world from distance, and from a third one (world :)). I have the same problems with a ML1640 and the same with a 1865W. The ML2020 the white one looks like an HP, the time will be the true about if is more Samsung or more HP. For me gum noise cancellation is on all of them. I love Samsung because living in third country you can use refilled toner cartridges :)

Mono-laser is trivial. I managed to maintain Samsung color laser for 20 years. I even cracked the cassette counter so I could use color powder bottles from Ebay. Unfortunately there was a secret compartment under the color-transfer belt. When it was full it started scratching the belt destroying it.

I wonder if there's now a potential for a 'coachbuilder' style service where a modern device is immediately taken to a company that premptively replaces any crappy components so it will last for much longer. I can definitely see this in the audiophile scene. It would void a manufacturer warranty but honestly how much is that worth for most kit these days?

@clonkex

Ай бұрын

I was thinking it must surely be possible to create a business like old-days HP that produces well engineered products. You'd have to market them as such to compete with the Chinese crap and include a long warranty but it seems entirely possible. I think you'd also have to carefully avoid the "infinite growth at any cost" mentality that modern businesses take, which means no public trading.

I also encountered the sticking electromagnet. Funnily enough it was in a HP color laserjet 1500 (it is used to lock the rotating carousel that holds the 4 toners).

I used to repair Okidata printers and copiers for a living. An electric screwdriver is absolutely essential.

Right to repair is an important thing.

Nicely fixed. The power supply in that thing is so easy to get to, compared to one in my OKI MB260 I discombobulated for this year's April Fools.

@Hans-gb4mv

Ай бұрын

Easy? That was still a lot of screws imho. Except in this case I can understand due to the high voltage.

Funny thing on a totally different samsung printer model I have, there is a problem with the solenoid and absorber part too, but different. with time the little pad shifts, causing the metal to metal contact and with bad luck and some residual magnetization the little tab sticks to it. gluing on a piece of cardboard helped and luckily only opening one side was necessary.

You no doubt get this kind of request a lot. I have an HP DesignJet 430 that I felt was too expensive of an investment to trash, so I still have it. Problem is, I can't find a driver to work with modern OS's. I'm about to send it to the recycling process, so I was wondering if you might want it. The last time I got it to work, it worked. I had an issue with one of the drive belts so I replaced it. It only prints in black and white, but could be upgraded, if you want. I hate ewaste.

Had my Samsung ML-2525W for around 15 years. Still going strong. Nice to have this has a backup plan though - should things go pear shaped in a similar fashion.

Crapacitor issue with my Brother laser printer, too. It would not start when switched off with wall plug connected. Always had to pull the plug first shortly, then switching on was possible. Common fault of several Brother models. Luckyly it happend one month before 3 years guarantee period ended, and certainly the wohle main board was replaced.

The apple laserwriter II had the same EXACT problem. I fixed one waaaay back in 2001. The general problem is business people interacting with technology. Some times you have to say no business people, they'll try to pull every fast one they can. Sometimes they even think there doing the right thing, and you have to tell them NO.

Minus voltage? Ohh, negative voltage. Got it! 😁

It's always the damn capacitors! Just repaired a monitor with the same crappy green capacitors.

Modified modified paper take-up!

My problem with any slightly old printer is the rubber wheels stop working for pickup

"Oh, drat these computers. They're so naughty and so complex. I could pinch them." - Marvin The Martian

I had a Samsung b&w laser printer but I gave it away and bought a Brother all-in-1. I think I paid only $75 for the Samsung. It's a shame that society is so oriented toward consumerism that everything is thrown away and replaced instead of repaired. Naughty people who made that naughty printer. 😭 BTW some printers can do a self test printout page if some buttons are held down during power on. I salvaged an old Minolta copier, must've weighed 35kg - very heavy for a desktop. It was ruined by being out in the weather. The counter said 163,000 copies. It was built like a tank - the scanning assembly was an electro-optical marvel!

Maybe a slightly older one .. for example, (there are others) a Brother DCP-7020 from 2005 .. a really great printer that is very similar to that one.

Some of those printers case panels are a nightmare to remove, mostly clips, black plastic on black plastic, the clips are impossible to see without using a bright torch light. Also, not much to reuse when taking then apart, and not scrap value except for some copper magnet wire, I do not even bother picking them up anyome when I see one abandonned on the curbside 😴

@SeanBZA

Ай бұрын

Yes ewaste by me will only take them for free. So i strip the board out so I can at least get the wiring loom, such as it is, and the few low grade boards. Yes I pull the toroids off as copper and scrap steel for the cores. Just watch out for the CCA wire which is making inroads into those as well.

@clark9992

Ай бұрын

Yes, that's always been a gripe for me. Even on printers from the 90's. The cases are held on with clips instead of screws. You need reference material, and a lot of patience to remove them.

Still happily using my LaserJet 6L.

@laylatrix22

Ай бұрын

I've got two HP2430dt / HP2430dtn "dumpster finds" ~5 years ago. Printing Invoices and shipping labels on average 10-15 pages/day like clockwork.

@SeanBZA

Ай бұрын

Plus you can still get spares for them aftermarket, including good toner units.

I just had this happen to me. Same exact model. Chucked it away and got a brother.

Lexmark redrive units for duplex printing also have the same sticky foam fault. Worse, they put the foam on the actuator and it serves to shim the actuator in range of the coil, it rests against the stop and gets stuck open. The lucky ones just spit the first page out, complain of a paper jam, clear the errant jam and they start working! Some need more encouragement.

I have had many inkjets including great innovative HP ones in the early 90's and then horrific HP ones after Carly Fiorina destroyed the company. I've also endured Epson and Lexmark inkjet hell. The one great printer I've had all along that just does a decent B&W print is the Samsung ML-2010 that I have had for 20 years. Dirt cheap printer and can be refilled with toner for next to nothing.

What a repair! And yes, I have a 10+ year old HP LaserJet 400 401n. It's never been apart and has never jammed or failed in any way. It even gets FW updates from HP! Maybe Samsung should stick too refrigerators and SSDs?

@tookitogo

Ай бұрын

Samsung exited the printer industry in 2017, when HP bought the printer division. Some of today’s HP laser printers use Samsung-derived print engines, many more continue to use print engines bought from Canon. (Nearly all HP laser printers prior to the Samsung acquisition used Canon print engines, now it’s merely “most”.) And you do realize that Samsung home appliances (fridges, stoves, etc) have a terrible reputation? That’s a business Samsung should _exit_ for the benefit of consumers.

You don't need to disassemble whole sticky solenoid to fix it. Just remove panels until you can see it, and put a drop of silicone oil on the rubber.

Of course, laser printers in the 90s were basically inaccessible to normal users - they still cost in the thousands. In the 90s, you hung onto your 9 pin dot-matrix (the lucky people had a 24 pin!) until in the mid 90s when you could buy an HP inkjet printer and get that "near letter quality" printout. It took until the 2000s that laser printer prices started dropping quick. Of course, if you priced them out, you can buy a new laser printer for $200 now, while that HP 4/5/6 probably cost around $5000-10,000 new today. So yeah, you pay good money for that stuff back then. Then again, that $200 laser printer today would've been like $50 or less back then, and when lasers were costing $2000+ you'd get funny looks as to why you're selling it for such a ridiculous price.

My cheapie HP LaserJet 1012 recently started doing the two-page uptake paper jam thing. I wonder if it uses the same kind of relay as that Samsung. I guess I will have to take it apart and look.

We have a HP b&w 1200 printer and it’s like 20-25 years old.

Scary burn marks around the set of resistors

HP 4L, HP4 was the last printer. HP5L and HP6L had issues in paper picking. Maybe electronics was better. HP4L has amazing paper feeding system- you can pass cardboard without problems and print on it.

Watching this on my laptop, as my main PC won't turn on because of dead 2032. And this battery was replaced 3 months ago. And yes, "great" engineering went into motherboard which won't turn on with dead battery. Thank you Gigabyte. First time when it happened I suspected PSU and those which can feed Threadripper aren't cheap. 1$ battery was the culprit.

needs new sep pad or roller depends on the design for the dual pick or the tray lift if it is not just spring pressure is not working correctly

@unmanaged

Ай бұрын

hahaha this is a common failure in HP 4200 4250 and 4300 and other color printers too ... the sticky pad on the solenoid forgot about that one ...

Interesting 'silk screen' around those poor resistors ...

My Epson XP-55 inkjet (I hate inkjet) had a dried up the post-rectifier capacitor which took out the chopper transistor and a strange internal fuse. Not easy to work on, not a very successful KZread video, but got it working for very little cost. Much happier with laser printers. I had to change the fuser film on my HP Laserjet P3015 about 10 years ago and it's just kept on churning out prints every since. CNTRL-P, RETURN. Nothing else to think about apart from whether to print double-sided, it just works. If HP mono laser printers were cars, they would be Toyotas. (Alas their colour laser printers, well maybe Fiats.)

@Petertronic

Ай бұрын

I had a HP Laserjet 5N that ran for many years, it did 10's of 1000's of pages, no problems!

It's interesting how bad the caps can get before the unit stops working.

I'm learning only now, almost 8 years late, that HP bought Samsung's printer division. It's so odd to look up info on this printer and find this printer's support page on the HP website.

HP DOES own Samsung's printer division, however. 😁

4 teal green resistors look like they blew darkness around them

Same printer as a Dell 1130n I believe.

I am still missing the connection to the Apollo mission!

Lol i noticed you use bubble screensaver with black screen issue. Theres a sketchy ass tool I used 5ever that freezes the display and grabs the scr file to get real xp bubbles.

Personally I'd invoke the annoying printer visits the rifle range rule.

My Xerox Workcentre 3220 had the same solenoid issue. But was stuck to the foam on the other side and wouldnt pick up paper anymore. Planned Obsolecence?

Does the Chinese space station use the green caps?

My LaserJet 5Si died only recently. She was a fine printer may she RIP. Missing the ability to print 11x17.

I would replace the caps by the heatsinks too, I am sure they have been getting cooked and will die soon too, even though they test good now, will they still be good in 6 months, probably not. NOTE FOR DESIGNERS: don't layout crapacitors right next to a heat sink unless you are trying to shorten their life...

Has a LJIV with the dreaded 'crumpled paper'-syndrome.... ie bad pull out from the fuser rollers....

It's spring and the capacitors are blooming.

Comparing an HP6 to a Samsung printer is compating a Volvo 740 to a Yugo

Given that Samsung exited the printer business in 2017 (when that product line was sold to HP), it’s a bit of a stretch to call this “modern”. :p Amusingly, HP bought Samsung’s printer business so they could stop relying on Canon and Fuji-Xerox for laser print engines. But they never entirely got away, and HP has largely switched back to buying print engines from Canon. Only a few models use Samsung-derived print engines.

I had a second-hand Laserjet 4000N for a long time. I really should never have gotten rid of it, especially as I've lived in inkjet hell ever since, but I just couldn't be bothered to replace the rollers... Ugh, someone go back in time and slap past me, please.

Factory must get a serious bulk buy discount on screws! 😖 Just say no to crapacitors - Don't be vague, Insist on Sprague! 🙃

There's nothing sadder than a cooked el-cheapo single-sided phenolic PCB with the offending and obvious power resistors sitting directly over the blackened spot. Inexcusable in modern electronics; we have no real reasons any more for needing this kind of power-wasting solution other than extreme cost-cutting.

It is a shame that these days, many electronics are not designed to last. Ressources are not illimited!