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» 8mm Forum   » 8mm Forum   » Cleaning the photo diode!

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Author Topic: Cleaning the photo diode!
Leon Norris
Master Film Handler

Posts: 290
From: Elkins Park, PA, USA
Registered: Jun 2012


 - posted February 05, 2019 12:17 PM      Profile for Leon Norris   Email Leon Norris   Send New Private Message       Edit/Delete Post 
I want everyone to be carefull when cleaning the photo diode. For optical sound. I have seen the little mirror fall off! So when cleaning do it carefully! Because the part is old! I use alcohol on a cotton swab! Keeping it clean helps the sound stay clear! So again be carefull!

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Chip Gelmini
Phenomenal Film Handler

Posts: 1604
From: Brooksville, FL
Registered: Jun 2003


 - posted February 06, 2019 04:41 PM      Profile for Chip Gelmini   Email Chip Gelmini   Send New Private Message       Edit/Delete Post 
Leon

Can you please post pictures of doing this procedure with thanks

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Osi Osgood
Film God

Posts: 9802
From: #399R K.O.A. Mountian Home, ID. 83647
Registered: Jul 2005


 - posted February 08, 2019 11:44 AM      Profile for Osi Osgood   Author's Homepage   Email Osi Osgood   Send New Private Message       Edit/Delete Post 
Yes, most definitely, share the info ... with photos! I'm wanting to do this myself!

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"All these moments will be lost in time, just like ... tears, in the rain. "

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Leon Norris
Master Film Handler

Posts: 290
From: Elkins Park, PA, USA
Registered: Jun 2012


 - posted February 08, 2019 12:12 PM      Profile for Leon Norris   Email Leon Norris   Send New Private Message       Edit/Delete Post 
The photo diode is very easy to find! Its right behind the optical sound lens! Take a small flashlight and shine it Behind the optical sound lens. You can't miss it. It has a small mirror on it. Your flashlight will reflect the light on the mirror! Take a cotton swab dipped in alcohol. And clean it! Very easy to do! Good luck! Leon.

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Osi Osgood
Film God

Posts: 9802
From: #399R K.O.A. Mountian Home, ID. 83647
Registered: Jul 2005


 - posted February 09, 2019 11:27 AM      Profile for Osi Osgood   Author's Homepage   Email Osi Osgood   Send New Private Message       Edit/Delete Post 
I was looking last night in the projector and couldn't see any mirror anywhere. Could you put up a photo, as I'm betting that I'm just clueless.

All I see is the lamp on the right, the lense apparatus, and nothing else, unless is far behind somewhere on the left.

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"All these moments will be lost in time, just like ... tears, in the rain. "

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Leon Norris
Master Film Handler

Posts: 290
From: Elkins Park, PA, USA
Registered: Jun 2012


 - posted February 09, 2019 11:41 AM      Profile for Leon Norris   Email Leon Norris   Send New Private Message       Edit/Delete Post 
OSI, Its right behind the sound lens! The rear , means the back of sound lens. As I said take a small flashlight and shine it towards the back. Behind the sound lens. It has two wires soldered to it! Its black in color! And has a little mirror on it! Again you can't miss it!

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Paul Adsett
Film God

Posts: 4727
From: USA
Registered: Jun 2003


 - posted February 09, 2019 12:53 PM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
Its a lot easier to get at if you first remove the green plastic capstan roller arm.

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The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,

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Leon Norris
Master Film Handler

Posts: 290
From: Elkins Park, PA, USA
Registered: Jun 2012


 - posted February 09, 2019 06:56 PM      Profile for Leon Norris   Email Leon Norris   Send New Private Message       Edit/Delete Post 
Also you can use a cotton swab. The wooden ones that are six inch long and duel tips. Makes it a lot easyer to reach! And get to the photo diode! That what I use when I clean mine!

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Chip Gelmini
Phenomenal Film Handler

Posts: 1604
From: Brooksville, FL
Registered: Jun 2003


 - posted February 09, 2019 08:25 PM      Profile for Chip Gelmini   Email Chip Gelmini   Send New Private Message       Edit/Delete Post 
I once read somewhere that when Elmo put optical in the super 8 projectors they put some kind of a reducer on the circuitboard in the event of over modulated optical tracks

What this means is an compared to level of magnetic sound mode optical sound volume will be considerably lower than magnetic volume output

So you will have to turn up the volume a little higher when running optical as compared to running magnetic

A good thing to remember So that even when you know your optics are clean and properly adjusted you will not have a problem playing sound thinking that why is the volume lower than magnetic because you will be right but this will also be normal

Just carefully turn UP volume for OPTICAL.

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Osi Osgood
Film God

Posts: 9802
From: #399R K.O.A. Mountian Home, ID. 83647
Registered: Jul 2005


 - posted February 11, 2019 11:42 AM      Profile for Osi Osgood   Author's Homepage   Email Osi Osgood   Send New Private Message       Edit/Delete Post 
Still don't see it ... photo's please. (I'll take another look. I'm persistent!) [Smile]

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"All these moments will be lost in time, just like ... tears, in the rain. "

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Leon Norris
Master Film Handler

Posts: 290
From: Elkins Park, PA, USA
Registered: Jun 2012


 - posted February 11, 2019 03:27 PM      Profile for Leon Norris   Email Leon Norris   Send New Private Message       Edit/Delete Post 
OSI, Just Look Behind the Optical sound lens! The back of it! Just look straight back! Again you can't miss it! Leon.

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Osi Osgood
Film God

Posts: 9802
From: #399R K.O.A. Mountian Home, ID. 83647
Registered: Jul 2005


 - posted February 13, 2019 12:03 PM      Profile for Osi Osgood   Author's Homepage   Email Osi Osgood   Send New Private Message       Edit/Delete Post 
I'll take a picture of my projector, what I am looking at and maybe, by taking the photo, putting some arrows on it to point it out, I might finally "get it"! [Smile]

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"All these moments will be lost in time, just like ... tears, in the rain. "

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Osi Osgood
Film God

Posts: 9802
From: #399R K.O.A. Mountian Home, ID. 83647
Registered: Jul 2005


 - posted February 14, 2019 11:58 AM      Profile for Osi Osgood   Author's Homepage   Email Osi Osgood   Send New Private Message       Edit/Delete Post 
Leon ...

I wonder if the whole confusion on my part is due to not calling things what they are ...

Is you're "photo diode" the same thing as the "Lense apparatus", right next to the lamp on it's left side, that I took out and cleaned both sides of and then screwed back into place?

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"All these moments will be lost in time, just like ... tears, in the rain. "

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Leon Norris
Master Film Handler

Posts: 290
From: Elkins Park, PA, USA
Registered: Jun 2012


 - posted February 14, 2019 12:17 PM      Profile for Leon Norris   Email Leon Norris   Send New Private Message       Edit/Delete Post 
OSI, You have three different parts that work the optical sound!
1- the optical lamp. 2- the optical sound lens. 3- the photo diode. They all have to do with the optical sound! So here we go! The lamp light beams thru the sound lens .and then the light beams to the photo diode! Witch gives you sound!IF I get a chance I will put a picture of the photo diode. Leon.

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Osi Osgood
Film God

Posts: 9802
From: #399R K.O.A. Mountian Home, ID. 83647
Registered: Jul 2005


 - posted February 15, 2019 11:53 AM      Profile for Osi Osgood   Author's Homepage   Email Osi Osgood   Send New Private Message       Edit/Delete Post 
Thanks! I would certainly appreciate it.

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"All these moments will be lost in time, just like ... tears, in the rain. "

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