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Wcs1970
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Hitachi MX910E will load a tape but on play the take up spool doesn't rotate thus causing the VCR to stop, take up the loose slack sometimes, eject and turn off the VCR. I've stripped it down and done a visual inspection and everything looks good to me although I'm not an expert and only just getting into this sort of thing. I thought maybe it would be a mode switch problem from watching other YouTube videos but to be honest I can't see one on this but I maybe I'm looking for the wrong thing. Any help and advice would be appreciated. Thanks

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Topic starter Posted : 11/06/2022 3:28 pm
crustytv
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First, A warm welcome to the forum. 👍 

Members John, @jayceebee and Baz, @red_to_black are our resident VCR specialists. In relative terms, this is a fairly modern VCR. Both John and Baz worked on many players, right through to the more recent ones. I suspect when they log in, they may be able to advise you on where to troubleshoot.

John & Baz, I have placed the Hitachi VTMX900 (the 910 is covered) series service manual in our data library, should you wish to assist Wayne with his repair.

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Posted : 11/06/2022 3:50 pm
Jayceebee
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Hi, and welcome from me too. What you have there is the weird and only later to become wonderful, Philips Turbodeck machine. In it's earliest incarnation they were poor with plastic parts pressed into the chassis breaking leading machines being unrepairable. To give them their due Philips made some design changes they improved immensely and became one of my favourite decks.

Being a Philips they are a bit different in the way things are done. No mode switch as such just sensors, one with a funny windmill photo-interupter on the worm drive to the main cam. Has it always had this fault? The reason I ask this is if the carriage has been removed and not reinstalled by the book the tape may not be being fully loaded on to the reel tables. Another common problem is a spilt gear on the long shaft driven from the loading belt although this didn't cause lack takeup.

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Posted : 11/06/2022 8:20 pm
Wcs1970
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@jayceebee it was working fine until I tried a VHS-C adapter tape to watch some old camcorder tapes. I'm not imagining things then when I say there isn't a mode switch like many VCRs. Removing and replacing the carriage seemed pretty simple and I took my time with it. I checked all the infra red lights were working with a camera when I had the carriage out and they all seemed okay. I don't suppose you have any photos or diagrams that could point to specific area to check. Thanks

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Topic starter Posted : 11/06/2022 10:25 pm
Jayceebee
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I'm also presuming you have checked the idler, it's belt and it is trying to FF/REW also? Weird was a but strong a word to use, Philips did things their own way so it's a little different. The adapter may possibly have caused the carriage to jump out of alignment and I recommend this be checked first but easier said than done. It's very difficult to describe also unless you've done it, here goes.

With the carriage out of the machine put it in the down position by winding the big gear on the side, you may have to trip the locks at the front that the cassette pushes against, can't remember if these have them or not. As the cassette tray lowers to the bottom of it's travel you will feel some resistance of the gear, a sort of a step. Go over this step and no further.

Now go to the deck, wind the loading belt until the cog on the worm drive disengages from the one that drives the big gear on the housing, it should now spin freely so the deck can no longer drive the carriage. 

Refit the carriage and lock it with the flat plastic piece. Mate to the PCB and power on, hopefully everything should return to the eject position then try a tape but not with anything precious on it.

Hope this helps, I'm not the best at communicating stuff like this. I had a look on youTube but the only detailed video I saw was in German unfortunately. Good luck.

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Posted : 12/06/2022 11:17 am
Red_to_Black
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Sidebands (Rich's) @sideband article in the TV mag on the Turbodeck will be of great help, sorry I don't have the link to hand, but that article was of enormous help to us when these decks were current.

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Posted : 12/06/2022 4:08 pm
crustytv
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I couldn't find anything written on the TurboDeck by @sideband, but I did find Alan J Roberts article from Feb 1999. I've added it to the knowledge base here.

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Posted : 12/06/2022 4:43 pm
Red_to_Black
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That is the article (Alan.J.Roberts) it might have been a pen name of Sideband at the time 😉

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Posted : 12/06/2022 4:47 pm
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sideband
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Posted by: @red_to_black

That is the article (Alan.J.Roberts) it might have been a pen name of Sideband at the time 😉

Ahh foiled!! My cover obviously wasn't good enough!! I had to devise a pen name for a couple of articles....some change of management I think were worried about 'company confidential' information being given away....like the Turbo Decks were falling to bits due to rubbish plastic being used......No! Really?? (I didn't say that by the way...) I'd already written the article under my own name so I had to hurriedly phone the editor to make the change (fortunately I knew when it was due to be published and the mags usually went to press some 6 weeks before issue). Obviously I would never have given away company sensitive information but my immediate manager who knew about and endorsed my writing exploits thought it would be better if I disguised my identity....So Alan J Roberts was born....I thought it sounded rather good......

 

I've just re-read that article....did I really know all that??? R to B....I'm glad you found the articles of use.

 

I was going to write an article on the Philips version 'G' deck but someone beat me to it....

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Posted : 12/06/2022 8:02 pm
Red_to_Black
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Was that Nick Beer?

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Posted : 12/06/2022 8:26 pm
sideband
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@red_to_black 

Possibly. I don't know if he covered the Philips version (which had a subtly different cam and brake assembly) or whether it was just the standard Panasonic version. 

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Posted : 12/06/2022 8:38 pm
Red_to_Black
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oh yes!, that article was of immense use, nobody outside of the Philips dealerships had really seen these machines (Hitachi and Thorn might have) so it was the beginning of baby steps with an unfamiliar deck to us!

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Posted : 12/06/2022 8:42 pm
Red_to_Black
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I had problems of my own with the Philips version of the G deck 🙂

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Posted : 12/06/2022 8:44 pm
Jayceebee
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Posted by: @red_to_black

 nobody outside of the Philips dealerships had really seen these machines (Hitachi and Thorn might have) so it was the beginning of baby steps with an unfamiliar deck to us!

The very first incarnations of the Turbodeck that came to us in D.E.R. were badged Finlux. They were truly awful.

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Posted : 12/06/2022 9:07 pm
sideband
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The guy in charge of producing the training course on these decks was indirectly responsible for discovering the weak spots and predicted many of them to the factories before they actually became fact. The factories were also aware of potential problems because of this and that is why certain parts of the non-replaceable plastic moldings became available. It would have cost Philips a lot more if they'd had to replace complete decks or worse, whole machines simply because a small plastic peg was broken.

I can't remember the nature of the brake repair kit now but it involved stripping the deck as far as the chassis molding, knocking the old bits off the chassis and then applying the smallest dap of superglue to the chassis, pressing the new moldings in and then just melt the plastic 'rivets' on the other side to complete the job. Many a turbo deck was saved from landfill....!

I have to say that once repaired, the decks worked well.

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Posted : 12/06/2022 10:20 pm
sideband
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Posted by: @red_to_black

oh yes!, that article was of immense use, nobody outside of the Philips dealerships had really seen these machines

 

Well that's good to know. I wonder just how many engineers/dealers were helped by these and other articles? It's odd that some 30 years after writing, people are still benefitting from them. The main problem now of course is that nothing is available.....

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Posted : 12/06/2022 10:25 pm
sideband
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Posted by: @red_to_black

Was that Nick Beer?

Come to think of it, it probably was. He called me one afternoon to ask about the differences since he'd been trying to fix one but had used the Panasonic cam thinking they were both the same. He said that when it unlaced, it was trying to bend the brake lever...I told him to use the Philips cam instead and gave him the part number. He called a couple of days later to say it was now working and he'd then compared the two cams. He said it was a really slight difference to the outer track which would never be known unless you had 'inside information'! 

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Posted : 12/06/2022 10:34 pm
Wcs1970
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@jayceebee okay I'll redo everything. Hopefully I'll get some time in the week, if not it will be weekend coming up. Really want to get the bottom of this as a learning curve. I've also bought the exact same machine off eBay that's working a great. Certainly won't be putting a VHS-C adapter in it. Heard other people say these adaptors had broken there machine so I'm curious what causes that or maybe it was on the verge of packing up anyway.

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Topic starter Posted : 12/06/2022 10:44 pm
sideband
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I seem to recall a similar story at Philips and the VHS-C adapters were not recommended. I don't think I knew the answer even though Philips sold the damn things!

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Posted : 13/06/2022 10:49 am
Wcs1970
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@sideband I can only imagine it has caused a timing issue by the cogs either slipping or cracking although I can't see anything broken.

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Topic starter Posted : 13/06/2022 2:44 pm
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