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Video Circuits V15 – Tripler Tester
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Mishaps In The Trade
1971 Beovision 3200
1971 Bush CTV1120
Granada Television Brochure, 1970s
Long Gone UK TV Shops
Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
Thorn TX10 Chassis
Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
Rumbelows
Thorn EMI Advertising
Thorn’s Guide to Servicing a VCR
Ferguson 3V24 De-Robed
Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
Ceefax (Teletext)
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
D|E|R Service “The Best”
The one that got away
Technical information
The Line Output Stage
The map
Tales of a newly qualified young engineer.
Tales of a Radio Rentals Van Boy
Sanyo SMD
Disastrous Company Rebranding
1969 Philips G22K511
Memories Of The TV Trade
Crazy house
Dirty TV screens
Dual Standard and Single Standard CTV’s
Radios-TV on YouTube
The Winter of 62/63
A domestic audio installation
1979 Ferguson Videostar Deluxe 3V16
Music centre modifications
Unusual record player modification
B&K 467 Adapters
Mishaps In The Trade
1971 Beovision 3200
1971 Bush CTV1120
Started cleaning the melted belts, my god what a mess its in more places than I thought, even in the belt brushes and on the eddy drums.
Any way I digress, what I'm a little perplexed by is one belt location. Anyone familiar with or can remember the location of the N1500 belts? Well one in particular.
I'm having trouble figuring out how just one of the belt fits, from the plans two are easy and obvious, however one is not, I can see where one end goes but not the other.
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Not to worry, I found a picture showing it
Now the goo removal begins in earnest.
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First wheel cleaned up, thankfully IPA works well once you've removed the worst of the goo. Getting it off the PCB is going to be fun!
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One wonders how belts can disintegrate into such a gooey mess.....
From reading other online sources (unconfirmed) the recurring thought is Philips and a few others in this period had either not perfected their own curing processes or the companies they sourced the belts from had not done so.
Its actually very evil stuff and unless cleaned off thoroughly before fitting new, will clearly prevent the mechanism from functioning as intended. The trick is also to not get it on your hands, one chap on youtube ended up plastering it all over the cassette player he was working on that had suffered the same problem, it was painful to watch.
In this VCR the belts have all completely perished and wherever they landed have then proceeded to revert to tar. Whilst this for the most part is annoyance and they have landed mostly on the PCB and components, inevitably the pulleys and drums have a fair share and these must be totally clean. I can only hope remnants have not found their way into extremely difficult to get at drive bearings/gears or mechanics. Time will tell as I progress with the repair, its certainly a long laborious messy task.
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Posted by: sidebandOne wonders how belts can disintegrate into such a gooey mess.....
That was my thought.
Frank
Posted by: JayceebeeYou're a brave man Chris, BTW do you have any prerecorded material for both the 1500 and 1700?
If you do have problems with the lacing cord and gearbox some ingenious person has come up with a fix here, a bit crude but it seems to work.
I did hear of the clock controls becoming live in early 1500s, I'm presuming the affected machine would have all been recalled?
Indeed the clock could fail "live" ... nasty. It's why mine has a later clock...
From CES issue 40.
John.
Mine is well beyond the 76,000.
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?
John.
Update:
Work on cleaning the liquefied drive belts continues, I'm now tackling the worst one.
The video head drum eddy disc was barely able to turn, the cause of this was due to a belt collapsing onto the reverse side of the disc and smearing itself over the surface. As a result of this it also deposited itself all over the gap where the disc passes through where the eddy current is developed/monitored, thus causing a goo trap and super efficient brake.
These belts are an absolute disgrace and nightmare to clean, despite great efforts to avoid getting covered in muck, invariably your fingers get plastered. I've also had to clean the belt brushes as they too ended up covered in belt goo. The belts seems to have got themselves everywhere, I'm wondering if in the players past life they had started to liquefy and someone started it up spinning the belts off in all directions.
Anyway once this major one is cleaned up I have just one smaller disc to clean and then I should be ready to fit the new belts. I will leave getting the remnants from the PCB until later on in the repair. I don't want to invest too much time on the clean up only to find the device is a no go. I just need to clean the areas of the mechanism that are compromised from mechanically operating due to the goo and see what gives.
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Progress is being made.
I saw Update then ‘work’ but my mind put ‘ing’ on the end of work, I will go back in my box now. ?
Cant say I have seen belts like that, a computer disk drive used to shred belts and bits went all over the electronics but they weren’t sticky and removed easily. They changed the belt design after that. Grundig tape belts went peculiar but again did not see them melt, I suppose they could after 40 year though.
Its just a slow messy job you have.
Frank
I have seen a few belts do this in ordinary VHS machines that have laid up for a long time, but no where near as bad as that or spread so far! Looks like its just melted on the spot.
Jon
BVWS Member
Phew! That's taken a lot of polishing but the biggest mess is finally cleared. Now just two small pulleys to clean.
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First belt now fitted, head drive. The counter belt is offered into position, I've just the supply eddy disc left to clean and then its belt and the counter finally set.
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Philips belts were starting to do this 30 years ago.
The goo clean up is now complete, all belts are in place, drive, take up and the eddy discs all run freely.
Next steps:
Base line evaluation of the power supply, cold checks of critical components including fuses. Assuming nothing untoward is discovered, I'll bring it up slowly on the variac.
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As an aside I noticed a spring was missing from the mechanics that are associated with the transport function keys. Mercifully this was located trapped in the area and has now been tensioned and refitted.
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Power supply checked out OK and the device was brought up on the variac over about 20 mins, no dramatics and 240V was attained. Decided to select "on" which should load the main drum assembly and test the dial cord load.
This was not so good. Initially it did fully load and the head stayed spinning, only the once though, now its as you see in the video below. It now attempts to load but ceases part way and disengages. No idea yet as to what or why this is occurring, for me I'm in uncharted waters. There does seem to be some slack in the loading cord but I'm unsure if this is the cause. See video below.
Trouble is the manual is in Dutch so understanding the operational characteristics of the mechanism is going to take some considerable time. Not relishing dis-assembling the loading cord assembly.
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Correction to the fitting of the displaced spring on the function keys slider, I got the positioning wrong.
Where I placed it resulted in not being able to eject the cassette tray. Instead of locating to the right, it must locate to the left, see below.
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