Mitsubishi HSU55 No Picture on Playback, just noise bars

[@IAdryan]

I've had an Grundig GV-470 with a similar problem. Some time worked perfectly and some time was very sensitive to noise. If i've forwarded on image it had gray bars instead of few lines with noise. It always recorded right. DIdn't succeed in fixing it and it was the best VCR i've put my hand on it. Sold it for being used as a tuner for cable tv for older tv with few channels. Damn i've loved that VCR (my own tv didn't have TXT but this VCR had). If i've seen this video kind of 25 years ago maybe i've had more chances fixing it. Anyway, nice video :)

[@screwi3]

My first thought was that it looked like a servo problem, and I think that the capstan cap was the main culprit here. But it could easily also have been the conductive glue. What ever caused it, you found it and fixed it :) Nice repair and keep up the good work :)

[@rayneduarte5881]

12voltsvids is a master in vcr repairs

[@12voltvids]

Used to be. Have forgotten much if it in the 16 years I have been out if the business more like 20 years as the last couple of years I didn't service many VCRs. They became disposable around 2000.

[@kd5yut]

@@12voltvids You don't look more than 50 yrs old?

[@12voltvids]

@@kd5yut I don't remember 50. I am closer to 60 than 50. I spent 23 years in the service business. While is school I worked for a small shop for 2 years then went to work for Sony for a year and then ended up at the service center I put up with for the next 20 before throwing in the towel. Also during this time I ran a successful video production company shooting corporate training and promotional video, real estate tours, and weddings. Put it to you this way I avoid reading the obituary section of the newspaper as I am seeing too many names I know. They are dropping like flies.

[@kd5yut]

@@12voltvids You are well preserved! haha. I am 67 and spent 46 yrs in the service business. I love watching your videos. Keep it up sir

[@wdavem]

Just remembered that my U71 SVHS deck also had the same squeak. Not sure why I put up with that. I think it was the sound of a clutch spring spinning in the transmission, but maybe one of the felt pad/disc resistance for the idler gear or playback foward tension drive. The mechanism might still be here so I could dissect it. It never had torque or shifting problems and didnt squeal in ff/rew. I miss that thing.

[@12voltvids]

That squeak was a fairly common fault on those machines. Clutch assy or the drum grounding spring most likely cause.

[@mrmagnetoscope]

I once got a Mitsubishi HS-U52 and the power supply made smoke when I plugged it, it was burning. I don't know why the fuse didn't blow.

[@NuGanjaTron]

I have an HS-M55 (PAL-Land version) which had massive cap leakage in the PSU, with traces corroded right through. I had to bridge at least two secondaries and replace _all_ caps (Rubycons and Nichicons), even the big stubby 3300µF and 4700µF ones, which rarely fail. The PAL-Land version differs in that it has a separate regulation board mounted on a large heatsink just behind the main PSU board. I also had servo probs (drum and capstan shutting down, audibly fluctuating, or just going completely spastic), plus a whacked out realtime counter which either didn't count at all, or spontaneously when no tape was inserted! Both of those issues were down to several leaking caps on the Main/Control PCB around the servo and counter ICs (BU2821 resp. M50927, both custom). Again, these were Nichicons, this time 47µF/16V and 100µF/16V. Replaced those caps and flushed the crap out from around and under the chips with isoprop, then left to dry overnight. No more crazy shorts! Lastly, the strobe disk under the takeup reel had developed a blister and was scuffing against the photodiode, resulting in spurious blips that messed up the rotation sensor (and realtime counter). I ended up carefully dissecting and removing the damaged protective film from the affected (silver) sector, and underlaying both reels disks with a thin washer, to safeguard against further contact with the photodiodes. This VCR is now pretty much resurrected but still has periodic loss of tracking when cold, stabilising after a few minutes of operation. Poking around with freeze spray revealed it's a thermal fault in the BU2821 servo controller, so not much I can do about that. As Dave has pointed out here (or the preceding video), this is a pretty decently built and well-featured VCR (offering super(VHS)-pseudo-quasimodo-playback and pseudo-NTSC/PAL-N playback), but really suffered from rubbish components, which is a shame.

[@NuGanjaTron]

P.S. As recommended by Synthematix, I of course replaced those rubbish 16V caps with 25V ones.

[@reel_images]

I have a similar machine (mitsubishi hs-423ur), it looks inside like this setup in this video. I was wondering if in your experience with these machines if you found a trim pod for the output volume. The output volume is very hot, slightly distorted. Not sure what can be done to scale it back.

[@reel_images]

I'm working on the mitsubishi hs-423ur. I had it all working, cleaned the encoder switch, had to cut it open with a razor, the little plastic thumb tac bulges to open it, but got it open and clean. Was all working, then I was looking for a tape belt for a cassette player, came across what looked like the same encoder switch, it fit perfect but the 5 wire pads on the new switch were a little out of order from the old one. I didn't notice when re soldering the new one to the VHS deck. It would power on a tape goes in and then when you hit play it powers off. I then noticed the switch was different, I then desoldered the old mode switch and forgot to power off the deck. Finished soldering and it does the same, tape goes in and then powers off after play of rr or ff is pressed. Could I have blown something while soldering with the power on? I'm racking my brain, I had it working and now it's dead. It an SVHS deck which is why I want it, I want to capture about 30 VHS taps via S-Video output. Regards; Phil

[@shaun9107]

Are all Plasmas this bad ?

[@changlongnan]

How to fix the squeaky sound problem? I have vcr with the problem

[@kevtris]

it's squeaking like a bag of mice!

[@fadhlematrook1248]

i have jvc model hr-j491ms vcr problem with play back..the picture come few second and go several time..the search picture is good whats wrong?

[@crashbandicoot4everr]

This is like my Beta machines. I fix the power supply, then a servo problem comes up. It plays fine, but there's no control track signal being recorded onto the tape in record mode. Gotta find another one for parts now...

[@12voltvids]

This is the problem with all old electronics. I never guarantee to be able to fix anything these days, and I never guarantee that anything I fix will stay fixed. Since I don't do this to make money I can and do walk away from things. Some people don't like this but it isn't worth the headache sometimes.

@1:38 yeah if someone turns on the Plasma TV in the house - it destroys all Shortwave and AM reception in like 25 meter radius at least.

[@12voltvids]

Yes I know. There are still tons of them in my neighbourhood. Several in my house.7 currently in use and I have 5 more spares awaiting their turn. This old one here in the workshop is a real power pig, and it throws out lots of noise. I just can't part with them though as the picture is so good.

[@t0nito]

@@12voltvids I can't imagine your power bills :p

[@12voltvids]

@@t0nito You don't want to know, but since you asked. It is around 450 per month. Keep in mind that everything here is electric. My house is heated and cooled with a heat pump. Hot water is electric as is the hot tub in the back yard, and I have 2 fully electric cars sitting in the driveway. Sure they are both Chevy volts, which technically are hybrid, but the gas engine never starts until the battery is run down, which doesn't happen with daily driving. I charge them up at night. Out of all the plasma TVs in the house, generally only 1 is used at a time sometimes 2. If I am editing I will have one on as it is my program monitor for editing. I like to see a big picture, not a little window on the computer timeline. This summer has been brutal. Very hot so the central air has been running like crazy.

[@wdavem]

Yeah, a tuna schooner! Nothing like boiled and burning electrolyte. Very interesting fault behavior! I really thought it would be a loose connection. I've worked on machines that actually did have a bad rf connection that reacted to tapping just like that. The noise made by the fault looked different though, sometimes small white dropouts all over the screen. I'm guessing maybe that cap in the power supply was reacting to changes in load and physical vibration, and it leaked! I used to have a Mitsubishi U71 and it was really good, fast search. I've seen a lot of Mitsubishi vhs decks with bad Ic's that were given up on. I havent fixed one yet. On mine the video slowly died. This was before I had any test equipment so I just used it for audio because it still had index searching and sounded really good. Then one day there was a 'pop' and the display went out and I scrapped it.

[@12voltvids]

Those electrolytics made with fish oil really stank when they went pop.

[@MoisesCaster]

I fixed one yesterday, there was no video, just noises. It was a bad capacitor in the drum servo motor. The capacitor should be 3 microfarad, but it was 2 microfarad. Greetings from Brazil. Tanks.

[@Synthematix]

The problem is they used 16v capacitors when they should have been minimum 25volt. they were driven to failure. 3:52 the belt is disconnected

[@12voltvids]

That "belt" was an extra part. Doesn't drive anything.

[@mrmagnetoscope]

The sound the mechanism makes when turning is catastrophic!

[@TheVCRKing]

I don't want to jinx it but I bet there's going to be a part 3 to this.

[@hughmc5419]

12voltvids - You have a lot of skill with those machines. Its to bad that the vhs industry is gone. It all went streaming,via the mega billion phone companies & sattelite company's. Theres always big screen TVs, all that smd stuff and the tools to buy just to work on it. Electronics is a diffetent field with that stuff,multi- layer boards ect. I am 3 weeks away from my 61st. In plants we replace the units. Most stuff goes to trash bin...Peace...being honest.

[@750kv8]

I'd look at the squeaking noise too but yea, nice bughunt; bad caps and RoHS solder issues, the two big killers of these old things. I'm tempted to say that the electronics industry should get their shit together, but I guess, I'd be kinda late with that. Just this feeling about it when I saw that PSU. That was a huge mess there. :T

[@12voltvids]

If the unit was being used I probably world too. I know what it is, a spring rubbing on the clutch. That said this unit will likely never see power to it again.

[@wx4newengland]

This was like my Panasonic PV-1545 fix one problem- and a month goes by- and it's back dead in the water.

man oh man !

[@blueleoo2592]

There‘s a loose belt on the small motor

[@12voltvids]

That is a useless belt. Does nothing. Don't know why it is there. Just turns a pulley that freewheels. Seriously. I don't know why they put it there because it does nothing. Probably just a failure point so when it stretches it gets jammed up, stalls the loading motor and blows the fuse. If anyone knows why all these Mitsubishi VCRs have that small belt that turns the idler pulley I would love to know why it is there. Me thinks it is there so that if the mechanism needs manually unloading the tech can turn the freewheeling idler to back the motor off so they don't get grease on their fingers.

[@FeCr3]

@@12voltvids 3:20 ...or is it probably a "torque protection" for the mechanic there? (too much torque........pulley push against the plastic of the gears and brakes the motor of) ? Interesting!

[@blueleoo2592]

@@12voltvids Ok, thanks!

[@tremayne3]

Good job !!!

[@wilburchubs]

3.50 the belt is off both pulleys

[@zx8401ztv]

I've never liked the idea of putting a psu near the sensitive head preamps, it seems utter madness. That sound of rubber slipping on something sounds nasty, i've had pinch rollers do that, but the tape often drifts up or down and makes a dam mess :-(. Dam conductive glue, i removed that from my old yaesu frg7700 years ago :-(

[@Darryl603]

It's like a game called whack a mole...

[@dilnawaz001]

Good

[@randymoyer5351]

Change all the caps,.. bet they are all shot from just sitting.

[@rawr51919]

That and the machine's from a crappy cap era anyway, so just go and recap with good-quality caps.

[@RajEsh-hq1ex]

VCR parts ic Onida

[@DarrellRoper]

Leaky.

[@hughmc5419]

Thst cap had a std,it oozzed off...

[@fadhlematrook1248]

CAPACITOR SMELL LIKE DEID FISH ...

[@rpgggjdmsmkw8]

just throw that crap away

[@12voltvids]

You would be surprised what people pay for this old crap these days. Sold 3 VHS decks last month.

[@NuGanjaTron]

@@12voltvids Maybe he means "cap"? 😜

[@12voltvids]

@@NuGanjaTron no he means crap. I sell this old crap all the time.

[@NuGanjaTron]

@@12voltvids With this VCR, it's CRAP AS CAP CAN. Yeah, I'm still recovering from the stench...

[@12voltvids]

@@NuGanjaTron smells like the back end of a tuna schooner.