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  #1  
Old 11th January 2017
stead63 stead63 is offline
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FL50 Sticking Dials

Hi. I have a FL50 flash which hasn't been used for quite a while & now the dials are very difficult to turn.
Anyone any ideas on how to sort?
Thanks.
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  #2  
Old 8th October 2017
DerekW DerekW is offline
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Re: FL50 Sticking Dials

Were the batteries left in the flash gun and if so did they get corroded? If so the corrosion may have spread in the gun
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Old 9th October 2017
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Re: FL50 Sticking Dials

Thanks for the reply Dereck.
The battery compartment looks like new with no sign of previous battery leakage.
I have dribbled WD40 around the dials which has freed them up some what but they are still a little stiff to turn.
I will have to get used to turning them with 2 fingers & not just my thumb!
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Old 9th October 2017
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Re: FL50 Sticking Dials

Quote:
Originally Posted by stead63 View Post
Thanks for the reply Dereck.
The battery compartment looks like new with no sign of previous battery leakage.
I have dribbled WD40 around the dials which has freed them up some what but they are still a little stiff to turn.
I will have to get used to turning them with 2 fingers & not just my thumb!
NOT WD40!

Electronic switch cleaner.

Steve
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Old 9th October 2017
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Re: FL50 Sticking Dials

The spindles of the control knobs may pass through rubber seals to provide some sort of dust and weather sealing. If not used for a while they may become tight.

I would be reluctant to use WD40 or switch cleaner as the solvents in these could damage the plastic components, and wouldn't lubricate the seals. If the seals become swollen owing to these solvents the movement would be tighter still.

Probably the best solution is to simply turn the knobs repeatedly until they loosen off. This is something you could easily do whilst sitting watching telly!

The knobs turn around and around so you don't need to worry about turning them too far.
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Old 10th October 2017
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Re: FL50 Sticking Dials

Switch cleaner contains a lubricant and is designed specifically for situations like these: https://www.rapidonline.com/servisol...-200ml-87-0770

Steve
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Old 10th October 2017
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Re: FL50 Sticking Dials

Quote:
Originally Posted by Wreckdiver View Post
Switch cleaner contains a lubricant and is designed specifically for situations like these: https://www.rapidonline.com/servisol...-200ml-87-0770

Steve
Fair enough. My concern was for the plastics involved, but I will bow to your greater knowledge.
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Old 10th October 2017
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Re: FL50 Sticking Dials

Quote:
Originally Posted by Naughty Nigel View Post
Fair enough. My concern was for the plastics involved, but I will bow to your greater knowledge.
I know from bitter experience that some "Switch or Contact Cleaners" can have a devastating effect on plastics. They seem to have the ability to alter the plastic's internal structure causing it to shatter within hours. Servisol however is a reliable tried and tested safe product used by engineers for many years and can be used on all kinds of delicate instruments and plastics.

John
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Re: FL50 Sticking Dials

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Originally Posted by Naughty Nigel View Post
Fair enough. My concern was for the plastics involved, but I will bow to your greater knowledge.
I've been using switch cleaner for over 40 years Nige in the electronics industry. It is intended for use on switch contacts and potentiometer tracks made from all types of plastics and rubbers, seals etc. Restores worn components to almost like new and instantly frees up sticking controls and cures noisey pot tracks

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Old 10th October 2017
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Re: FL50 Sticking Dials

Quote:
Originally Posted by Wreckdiver View Post
I've been using switch cleaner for over 40 years Nige in the electronics industry. It is intended for use on switch contacts and potentiometer tracks made from all types of plastics and rubbers, seals etc. Restores worn components to almost like new and instantly frees up sticking controls and cures noisey pot tracks

Steve
Many years ago in my youth, I was involved in a CB Radio club. As I knew a little bit about electrics etc. members used to bring bits and bobs in to me to be soldered or repaired. They once brought around 7 or 8 PTT Microphones to me to clean the switches with my newly purchased Switch Cleaner which I promptly did. The next day every single Microphone had shattered into bits

Ever since, I've used Servisol or Electrolube.

John
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Old 10th October 2017
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Re: FL50 Sticking Dials

Quote:
Originally Posted by Johnheatingman View Post
I know from bitter experience that some "Switch or Contact Cleaners" can have a devastating effect on plastics. They seem to have the ability to alter the plastic's internal structure causing it to shatter within hours. Servisol however is a reliable tried and tested safe product used by engineers for many years and can be used on all kinds of delicate instruments and plastics.

John
Indeed. My concern was for the plastic casing, and especially the clear polycarbonate lens protecting the display.

The term 'solvent' is widely used but little understood. In this case "a solvent is any substance capable of dissolving other substances", and can include the propane/butane mixture used as a propellant, as this will be ejected from the container in liquid form, and will remain as a liquid for a second or two before evaporating.

There will also be some form of 'vehicle' in the formulation, (often white spirit) which is of course a solvent of types, but not as aggressive to plastics as (say) aromatic hydrocarbons such as xylene or toluene, or ketones such as acetone or MEK.

Exposure of some plastics to organic solvents does result in a permanent and irreversible change, and may also result in shattering if a moulding is stressed.
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