HI. Please could you help me? I have a sony betacam sp uvw . The tapes I record with it seem to read fine by it But when they are read by other betacam machines they give a disturbance as if the tracking alignment failed. (White lines below) Thanks in advance
It may have a tape path alignment fault. It's fairly unusual in these machines unless someone has been fiddling. Re-alignment is a fairly skilled task, requiring at least an oscilloscope and service manuals, and ideally some real alignment tapes (very hard to source). It could be a non-trivial repair.
I seem to remember that Grundig and Philips behaved disgracefully in the day, several silly formats, different tapes for each and as soon the format was discontinued no more tapes were made! 😡
I have one in standby mode. Edit led is on and front panel doesn't work. Also stuck in Forward mode. All this After removing the cassette upper case. Anyone knows how to proceed?
@@video99couk thanks for your replying. The standby led and also the forward led is on and the middle gear roll running without the tape inside. And sometimes jog led appears intermittent but the edit led sticks there and also no time code or error at the panel
Your videos are great, I love anything video, and remember agonising over beta or vhs. back in the day. I wish I understood the technicalities, but a little too long in the tooth to learn now!
Ciao, che pazienza nella ricerca del guasto e come lo hai risolto. Bisogna farti i complimenti: sei molto bravo e seguo molto volentieri i tuoi video. Buon lavoro, ciao
Well done! What a long way to find that little, improbable culprit! In any case, as it is confirmed again here, it is always good to have a second, working unit to narrow down the fault finding to a particular board.
Back in the summer of 1981, only 18 at the time, I bought a Sony C7 Betamax, that machine cost me £715, which would be around £2500 to £3000 today. Back then nothing was close to the picture quality of the recordings, and believe or not one of the first home VCR's to have colour picture search and slow motion playback, by the time the C9 with (HiFi Stereo) came out some 3 or 4 years later, getting rental films in Beta was quite difficult, so I didn't see the point in upgrading to the new model. Around 1987/88 the C7 finally gave up and was replaced be a VHS Panasonic. However, I still felt even after all that time and improvements to the VHS system the original C7 offered better picture quality recordings. Thanks for this insight into the world of build quality video tape recorders rarely seen....
The C7 was advanced for its day, if a little unreliable. That is due to get a mention in the RU-vid video that I will release later this week as it happens. The C9 though didn't have hi-fi stereo, only lousy linear stereo, so it wouldn't have been worth the upgrade to that anyway. Few Beta HiFi machines sold in the UK had trick functions like the C9 or (to a more limited level) the C7.
Wow..amazing beautiful picture..so gentle and not harsh..those Sony engineers really are something.love to see more pro audio gear too.. Love your crazy obsession with this astonishing gear.. Cheers..Ty from s.oz
My dad worked for NCR and gave us a techwctronix 555 4 trace oscilloscope what tech for the 1950s or early 1960s when it was built service able and. Working into the 1990s when we got it from our dad. Your equiet ent shows how engineering won over cost.
Btw. could this be the earliest full logic controlled VCR? All VHS or Betamax machines I know of had mechanical switches before 1981. (also - professional use VCRs don't count)
The professionally-targeted Grundig VCR601/Philips LDL-1100 portable VCR format machine was incredibly advanced for 1977 and had a logic-controlled transport. If that's a little esoteric, there's the domestic market VCR-LP format Grundig VCR4000 which predated the SVR4004. The VCR4000 and SVR4004 were externally very similar, with the latter differing internally to handle the needs of the higher density SVR recording format.
Almost forgot: Grundig had a VCR format machine targeted to the domestic market: the BK 3000. Externally clearly of the same lineage as their VCR4000 and SVR4004, also with a fully logic controlled transport. I think this model appeared in 1976, one year before the VCR601.
@@video99couk I have an SL-C7E and it was early 80s. Internet says it came out in '79 so the SVR4004 is a bit older. I actually grew up on an SL-C6E which 4 year old me inserted a buttered toast (my parents had to tape a straw to the vacuum to get the crumbs out of the mechanism...), I thought the C6 would be the predecessor of the C7. Although the C7 looks decidedly more retro, it has more functions. And almost identical circuit boards. They both have the same problem: No control track / capstan lock. Whenever I take them apart and start scoping around, as soon as I get close to where the problem is, the problem just disappears and they just start working again. Even after reassembly. Until I stop using them for a few days. Sounds like capacitor, doesn't it?
@@jchunter Whoa! Awesome info! Still it looks as if that doesn't change history - it still looks like it's Grundig who invented the full logic VCR. *sigh* back when Grundig was World Class... in the 80s they quickly became irrelevant and then the cheap far-eastern companies finally took over. In 1973 they came out with a 14 inch / 37cm portable colour TV that was fully solid state (neon indicator bulbs for the channel selector also don't count - the HV rectifier/tripler is also solid state) and used a (Toshiba made) in-line CRT. Very modern... apart from the power consumption... 110W... compare that to the late 90s, they were down to 35W on the same screen size. (still, compared to the 160-250W a similar sized tube colour TV had)
They look similar. But the N1500, N1700, SVR formats all recorded full field video so were "modern" video formats. The Quasar system was skip field so it dumped half the video information.
Very nice, Colin - there are always people ready to criticize, just ignore them. Yours are some of the most enjoyable videos on RU-vid - if someone thinks they can do better, they should start their own channel
on mine, the light bulb is burnt out. The machine still works normally. Looks like you have pretty much the same recording on that test tape as I have...
Can this method be used for Toshiba VHS/HDD/DVD multi? So instead of going through the dvd to get the digitalized vhs, I can access the vhs tape directly from the hdd.
I remember Sam from 'Look mom no computer' did a song and dance with the lyrics "you don't know what you're doing" as a reply to all those who made comments on his working methods in repairing an old church organ he had bought.
Given that this is the level of repair I do on vintage computers I was well entrenched in this. Must admit I was slightly disappointed when you didn't airpunch or dance around the room when it started playing properly :D Good stuff, cheers!
Brilliant, a little dark capacitor was found guilty! That machine is looking good and playing a nice picture. Colin just keeps on pulling these old vcr rarities back to life. Cheers 🍷
I wasn't aware of that feature on a JVC. Actually I think I may have owned a new one of those for a couple of weeks, back in the day. It kept breaking down and I replaced it with a NV-HS88 which was reliable (it still works!). So I never got to learn about all the JVC's features.
hi know about the trolls you get some people i know told me your having a channel is likely get alot of them yes i work on audio gear i have a brenel mini 8 i have working just waiting for pinch rollers to come back i have all the plans for it you know that hit a mole game very like that the repairs keep pop up all the time i am winning the game now there a sound craft 381- 8 for sell best not to buy it 200 uk just to get it going been there with a 600 reel to reel this video is not a money pit just like that game love the video's keep them coming
I tried my best to translate the pinout. Schacht is usually a narrow pit or a (mine) shaft but in this instance it's the cassette well. Fuehler (more usually spelled with an umlaut ü instead of ue) means sensor, error would be "Fehler". In a decent effort to make everything sound complicated, the Grundig engineers used the word for the tape type detection switch. The "Schachtkontakt" tells the machine whether the cassette tray is up or down. If that's constantly pulled low by a faulty capacitor, the machine gets confused. 1 - Locating hole 2 - GND 3 - +15 VE 4 - Flashing indicator (whatever that may be) 5 - Cass button (eject) 6 - Indicator „Cass“ (no tape) 7 - Play button and indicator 8 - FFwd button and LED 9 - Rew button and LED 10 - Stop button and LED 1 - Timer Record Start 2 - Timer Rec button 3 - 4 - Rec signal to power supply 5 - Tape end switch 6 - Rec button 7 - 50 Hz 8 - S1-B 9 - +15VR 10 - 11 - Y attenuation 12 - S2A 13 - FFwd signal 14 - S3 15 - 16 - N1 17 - GND 18 - N2 19 - Locating pin 20 - +15VE 21 - 22 - Cassette (type detect) switch 23 - On/off relay 24 - Cassette tray switch 25 - 26 - Unlace 27 - Play 28 - Rew 29 - Lace
S stands for Sibatit (SIEMENS ceramic type) capacitor. Capacitor or IC, the main thing is that SIEMENS is to blame. I have already written that you should only keep SVC recorders in a pack so that you can try out which one suits the recording device best. Market researchers have advised Max Grundig against SVC recorders. The ITT Videorecorder 241 is the rarest variant of this evolutionary dud. Since the transistor has a 100k Ohm resistor and the IC has a 6.8K Ohm resistor, the capacitor was the most likely cause. But as a TV Engineer, I wouldn't have found the problem any faster. Well done👍
The sound of heads at minute 17 is caused by an excessive tension of the tape. In spite the video has an optimal calibration from factory, maybe is necesary to adjust and loose a bit the tension of tape, because the tapes are subject to ageing and the sliding is not good as it should be. It can be a nightmare to adjust differently the tension adjust for every tape, but it happens, some too loose, some too tenses. Edit: Tension adjust is at page 12 figure Ab.7.1. Sometimes there is another problem, tape tension is not the same at the beginning then at the of the tape.
@@video99couk So, in that case, apply the gold law: If it works, don't touch it. Another tip: Capstan motor screws are not torqued at the end. This screws are part of some kind of capstan angle adjust, so, don't touch it. You can see it at 2.8 "wechsel des captanmotors" page 20.
Such careful and difficult work! Ultimately of course it's a futile battle against the basic entropy of the universe that pushes everything towards disorder and chaos. But we can gain temporary victories such as repairing obsolete video machines. It's a pleasure to see this.
tascam pcb's are awful the transport on 2488 all series of multitracks especially the mk2 are bendy and traces lift they are transport supposed to be pressed down on when tactile switches fail people press down even harder. if only they would copy the schematics and send them to pcb way so we could order a blank and repopulate them. Right to repair yeah right Tascam
Yes the Powerwall 3 makes sense on a new install. I understand that it's now available in the UK so shouldn't be long behind in Oz. Really it's not so much an integrated inverter, as no inverter. The only inverter is on the output side of the battery, just like any other Powerwall. They are deleting the DC from solar to AC and then back to DC for battery charging, which makes a lot of sense. There will still have to be some DC to DC management for battery charging, but that will likely be a high frequency (efficient) system.
My SVR4004 had some faults. Symthom: When the video is hot, some reels stops suddenly. Cause, in "motorelektronik" card, TR1363, TR1358. In manual service is BD898 but in my Grundig was TIP121. Just replace. The cause is that when the transistor is hot, internal junction fails. Symthom: Hardly seen green and violet vertical bars. Maybe is needed to adjust Chroma filter, but I solved it adjusting R1811 in chroma card to maximum. Symthom: Low signal in tracking indication. Low amplification by IC1683 TDA2700 in Chroma card? Just replace. I found some rubber rottens with cushion fuctions, I replace it with cable gland rubber. This are used in the reels motors and threading mechanism motors. A "must do" is to replace Roe Roederstein capacitors. Another faulty capacitors are tiny axial Philips caps, mostly in sound card. Note: I've tried convencional VCR tapes, and some tapes with VHS and Beta belts, and works perfectly like "Grundig high density tapes for SVR4004". So, I think there is no a real reason for to use different tapes in this video than in other VCR older video tapes. I think that "Grundig high density vcr tape" was a bullshit for comercial reasons.
There's something I've been wondering for a while now,& judging by the subject of this video, I think you're the person best placed to answer it. Beta had cleaner tapes are pretty highly priced these days, often reaching over £40. Vhs cleaner tapes are much cheaper. So, as the tapes are the same size, can I slice a section from a vhs cleaner into an empty beta chassis? Or would you just suggest cleaning the heads by hand?
There's no harm at all in transplanting a VHS head cleaner into a Beta shell. If you can splice onto the foil leader tape, then the proper auto stop will function too. If you can't get a spare Betamax shell, a small Betacam BetacamSP shell will work just fine too.
30:59 looking at the mechanism and PCB this was not really made by Grundig. The mechanism with the microswitches gives a strong JVC vibe and the chipset on the PCB is Hitachi and the Electrolytics Made in Japan. If it was a Grundig designed gear the higher level signal chips would be Philips/Valvo or Siemens and the caps Frako or ERO.
Since Funai made the first generation of CVC machines, it's quite likely they were involved in the Grundig model too, but they never marketed that improved version.
Wow, what a trip! Yeah those 723s are always a pain in the arse... when you show it the first time on the diagram I was like noooooo... a 723 😅 But it's strange why something was smoking, on the top part of the circuit there is an "electronic fuse" which through that SCR disables the output in case of overcurrent - at least, it should do that...🙄 So basically we had a dead 723 to begin with, and then that tantalum got shocked when it saw again some electrons after who knows how many years of total darkness 🤣And now something else gave up again. Maybe another tantalum had enough? 🙄 Can't wait the next episode 😅
ADAT is a repairman's dream machine and only repair men should own them if they get it to play once then put it away so they can repair it again when they try to use it next time the florescent vacuum displays are highly sought after as they can't be repaired
It's old equipment now and failures are to be expected. Fortunately I can keep this kit going, and also Tascam DTRS machines which are of a similar vintage and also break down.
@@video99couk I would love a ADAT machine i have everything from Reel to Reel cassette multi tracks. But the 90's equipment are verging on unrepeatable i have a Fostex 1624 mk2 similar to Alesis HD you have a great machine but the fostex is quite rare florescent display went out and i have been going thru everything on it suspect a power supply component. but so many IC's and processors very difficult and time consuming. I really appreciate your video as it's great to see old equipment working.
wow i never saw it in my short life...look this mechanics 4 heavy driver motors two big motors must be drum and capstan others one must be reel and loading
13:55 Without going into detail let it be said that to construct a proper oscilloscope probe attenuation devider you not only need a resistive devider scaling down the DC, you also need to use caps in parallel to the resistor to provide a scaled down path for your AC component. If you dont add any caps the input capacitance of ur scope to ground will form a low pass filter along with your high side atennuation resistor. What you get is a waveform that has low frequency response, no definition or sharp transitions or edges. Just look up the schematics of an average scope probe with inbuilt attenuators, watch the eevblog videos on homebuilt attenuation probes or refer to the literature on passive scope attenuation probes on for example the Rohde+Schwarz website. With your scope being only 5Vpp input you should really invest in a 1:100 attenuator probe. It will not only increase the useable voltage range on the scope x100 but also (and often most importantly) reduce both the capacitive and resistive loading down on the circuit under test by x100.
