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AF-977 bottom cover realign

Geplaatst: 27 mar 2018, 10:21
door pserci
HI all, i'm restoring this TT. All the things are almost ok, i'm waiting for the counter IC (4737) to fix speed display, but now all the function are working very well. Very impressive TurnTable, indeed, with its GP412-II and new stylus (thakker).
Only one thing remain to fix: the deformed bottom cover.
I thought to use a Heat Gun to heat the curved part...anyone try this in similar circumstances?

Thanks in advance for the support

Paolo from Roma, Italy

Re: AF-977 bottom cover realign

Geplaatst: 27 mar 2018, 11:08
door Hoewie Loewie
Hello. I did remodeling two or three times. with a paintstripper. The result was working features (lift, weightscale, antiskating) again but an ugly bottom. For me the first result was the most important. :D

Re: AF-977 bottom cover realign

Geplaatst: 27 mar 2018, 15:25
door Fotohuis
Only one thing remain to fix: the deformed bottom cover.
I thought to use a Heat Gun to heat the curved part...anyone try this in similar circumstances?
Indeed a paint stripper however the result will be ugly hence I do not like Philips turntables after 1978 where they have used full plastic.

Re: AF-977 bottom cover realign

Geplaatst: 27 mar 2018, 16:05
door pserci
HI all, thanks for the replies.
I think that "paintstripper" is what i define "hot air gun", right?
In my case, deformation is on below plan, all is working and mechanism are free to move, but TT is not plain and some feet don't touch the support base.
For all the other aspect, this TT intrigue me. Surprised by the GP412- II that give a very well open sound, detailed but not harsh.
Automatism are simply perfect and well silent on operation.

Re: AF-977 bottom cover realign

Geplaatst: 27 mar 2018, 16:11
door FransW
You can also place spacers under the four support points. It is important that the turntable is level. If you don't use spacers it will not be level, and in worst case the top housing will twist.

@ fotohuis and Hoewie Loewie: did you use standard paintstrippers, or temperature adjustable hot air guns? Mine is not flat also and I plan to buy a temperature adjustable hot air gun, to try at low temperature (200°C?). Standard paint strippers are 500-600°C and will burn the material.
For now it runs perfectly with spacers below the supports.

Re: AF-977 bottom cover realign

Geplaatst: 27 mar 2018, 16:19
door pserci
Obviously, when i try it it was leveled by spacers...
My "hot air gun" have two temperature, the lowest at 300°C and the highest at 600. My fear is that the plastic has temperature shrinking properties, that led to uncorreptable condition...but if you have resolved, i think that is not this case.
Another Idea was to cut the malformed part of the bottom cover replacing it with wood or aluminium....

Re: AF-977 bottom cover realign

Geplaatst: 27 mar 2018, 16:35
door Fotohuis
A standard fohn is not hot enough. I have a B&D 950W type indeed hot enough to burn the plastic. So you have to keep a certain distance. If the leveling can be done by spacers I would try this first. I really hate this work on any 777, 877, 977 and more modern types. It is a last rescue for the turntable who had standing above a big amplifier and has been demolished by the heat. You can have it too with a 212-312-222 or 209S bottom however much less severe and in most cases not at all but they have a wooden or aluminium case around.
Turntables are fine mechanics in combination with electronics and I feel like a butcher when I have to remodel a Philips turntable with this method. Apart from new bulbs, belt (and cleaning the old one, also crappy work), mostly the broken main switch, sometimes a LED and some new elco's they are pretty good turntables and easy to fix but this remodeling is a terrible job.

Re: AF-977 bottom cover realign

Geplaatst: 27 mar 2018, 16:43
door Fotohuis
Yes you can cut the malfunction part by a wooden replacement but it is also expensive. In Holland a malfunction Philips TT from 1970-1983 can be bought up from Eur. 10.
For re-working and replacing parts for Eur. 40 you can sell it for Eur. 70-100 (depending mostly on the type GP element which is in) where the price for a new bottom in wood will exceed Eur. 100 so if it is not for your own benefit it is a too expensive solution.

Re: AF-977 bottom cover realign

Geplaatst: 27 mar 2018, 17:17
door FransW
Not everybody's target is to prepare the TT for sales. As you say, when it is for yourself and can do a lot yourself, the 777-887-977-7610-7813 are worth it.

I think cutting out the bottom part will not help, because the upright part of the bottom is also deformed (in my F7813).

Re: AF-977 bottom cover realign

Geplaatst: 27 mar 2018, 17:27
door Hoewie Loewie
pserci schreef:HI all, thanks for the replies.
I think that "paintstripper" is what i define "hot air gun", right?
In my case, deformation is on below plan, all is working and mechanism are free to move, but TT is not plain and some feet don't touch the support base.
For all the other aspect, this TT intrigue me. Surprised by the GP412- II that give a very well open sound, detailed but not harsh.
Automatism are simply perfect and well silent on operation.
I think that paintstripper and hot air gun is indeed the same thing. Well give it a try, I would say. The 977 is no doubt a very good recordplayer.

Re: AF-977 bottom cover realign

Geplaatst: 27 mar 2018, 17:29
door Hoewie Loewie
FransW schreef: @ fotohuis and Hoewie Loewie: did you use standard paintstrippers, or temperature adjustable hot air guns? Mine is not flat also and I plan to buy a temperature adjustable hot air gun, to try at low temperature (200°C?). Standard paint strippers are 500-600°C and will burn the material.
For now it runs perfectly with spacers below the supports.
My paintstripper does not have adjustable temperature. It only has two speed of the fan.

Re: AF-977 bottom cover realign

Geplaatst: 27 mar 2018, 17:30
door pserci
Fotohuis schreef:cut cut ... In Holland a malfunction Philips TT from 1970-1983 can be bought up from Eur. 10.
For re-working and replacing parts for Eur. 40 you can sell it for Eur. 70-100...cut cut.
I pay for this AF977 170 euros, and is the cheapest (because to restore) that i can found in Italy. I know that in Holland these gears are very cheap, due to diffusion. In Italy are a quite rare items to find.
I'm very curious of a TT that have Quartz PLL on Belt drive... and remind me when young and see these on Philirama magazines...
Thanks again, keep you all informed

Paolo

Re: AF-977 bottom cover realign

Geplaatst: 27 mar 2018, 17:39
door Hoewie Loewie
For the record. This is what I used. As you can see, it's 1500 watt. Definitely not a hairdryer............ :doh:

Afbeelding

Re: AF-977 bottom cover realign

Geplaatst: 27 mar 2018, 17:47
door FransW
Very useful as a depilator :D

Re: AF-977 bottom cover realign

Geplaatst: 27 mar 2018, 18:16
door HermanH
Hoewie Loewie schreef:Definitely not a hairdryer............ :doh:
Maybe you used it once ?