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1974 Philips N1500: Finally!  

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crustytv
(@crustytv)
Vrat Founder Admin

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.

belt
belt2

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Posted : 16/12/2018 2:10 pm
crustytv
(@crustytv)
Vrat Founder Admin

Not to worry, I found a picture showing it

N1500 7

Now the goo removal begins in earnest.

goo

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Posted : 16/12/2018 2:42 pm
crustytv
(@crustytv)
Vrat Founder Admin

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!

dgoo 1
dgoo 2

 

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Posted : 16/12/2018 3:31 pm
sideband
(@sideband)
Famed V-Ratter Moderator

One wonders how belts can disintegrate into such a gooey mess.....

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Posted : 16/12/2018 8:19 pm
crustytv
(@crustytv)
Vrat Founder Admin

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 : 16/12/2018 8:35 pm
Nuvistor
(@nuvistor)
Famed V-Ratter Registered
Posted by: sideband

One wonders how belts can disintegrate into such a gooey mess.....

That was my thought.

 

Frank

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Posted : 16/12/2018 10:37 pm
Doz
 Doz
(@doz)
Noble V-Ratter Registered
Posted by: Jayceebee

You'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...

 

20140802 135941
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Posted : 17/12/2018 12:27 pm
Jayceebee
(@jayceebee)
Noble V-Ratter Registered

From CES issue 40.

CES40

John.

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Posted : 17/12/2018 10:09 pm
crustytv
(@crustytv)
Vrat Founder Admin

Mine is well beyond the 76,000.

serial

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Posted : 17/12/2018 11:34 pm
Jayceebee
(@jayceebee)
Noble V-Ratter Registered

?

John.

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Posted : 18/12/2018 11:06 am
crustytv
(@crustytv)
Vrat Founder Admin

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.

vh1
vh2
vh3
vh5
vh6

 

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Posted : 08/01/2019 2:36 pm
Nuvistor
(@nuvistor)
Famed V-Ratter Registered

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

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Posted : 08/01/2019 3:45 pm
TVJON74
(@tvjon74)
Honorable V-Ratter Registered

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

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Posted : 08/01/2019 7:13 pm
crustytv
(@crustytv)
Vrat Founder Admin

Phew! That's taken a lot of polishing but the biggest mess is finally cleared. Now just two small pulleys to clean.

before
clean

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Posted : 09/01/2019 2:13 pm
crustytv
(@crustytv)
Vrat Founder Admin

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.

belt1
belt2

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Posted : 09/01/2019 7:39 pm
sideband
(@sideband)
Famed V-Ratter Moderator

Philips belts were starting to do this 30 years ago. 

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Posted : 09/01/2019 7:59 pm
crustytv
(@crustytv)
Vrat Founder Admin

The goo clean up is now complete, all belts are in place, drive, take up and the eddy discs all run freely.

belt3
belt4

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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Posted : 10/01/2019 10:55 am
crustytv
(@crustytv)
Vrat Founder Admin

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.

topdeck1
topdeck2
topdeck3

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Posted : 10/01/2019 12:04 pm
crustytv
(@crustytv)
Vrat Founder Admin

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. 

load4

 

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Posted : 10/01/2019 3:17 pm
crustytv
(@crustytv)
Vrat Founder Admin

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.

spring1
spring2

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Posted : 10/01/2019 3:41 pm
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