Scroll Knob on BCD536HP

[Ubbe]

It was an easy fix. The encoder is easy to get at after removing the outher box and screening plates.
It has no apparent hole to inject contact cleaner but it absorbs it between the metal and plastic when I let the frontpanel rest on the table.
Works perfect again.

I wiggled the encoder contacts on the little circuit board, so it might as well had been some bad connection, as is common in older Uniden scanners.

/Ubbe

 

[gary123]

Ill get some cleaner and give it a shot. I am assuming you used non residue cleaner? Some devices use a silicone type lubricant and I dont want to wash out any thing like that.

 

[jonwienke]

You want a contact cleaner specifically designed for the purpose. WD-40 and some other solvents will dissolve some plastics.

 

[bob550]

I've used the old RadioShack "Control Contact Cleaner and Lubricant" spray for many years to clear up the operation of volume pots for various radios and other devices. It always worked well for me. I couldn't tell you what a currently-available product equivalent would be, however.

 

[gary123]

I have proper tools and a service bench. I was just hoping to save experimenting on which type of cleaner to use. The actual manufacturer is not important. If Ubbe can chime in on which type he used ill give it a shot and post the results.

 

[Ubbe]

Contact cleaners that could cause damage to plastic usually have easy to see warning texts.
I used a standard multi purpose cleaner that also lubricate, probably from the same family of types as WD40 and CRC5-56.

http://www.biltema.se/BiltemaDocuments/DetergentIngredientDataSheet/36450_FS.pdf

Butane
Isobutane
Propane
Hydrogen treated naphtha purified
Mineral oil
Sorbitan oleate

/Ubbe

 

[gary123]

Thanks Ubbe Ill give it a shot and post the results.

 

[gary123]

As promised here are the results.

Caution do this at your own risk. DO NOT USE WD40.
WARNING: Disassembling the unit may void any and all warranties. Do so at your risk.
WARNING: If anything happens to your unit its your fault not anyone elses.
WARNING: This work was done on a proper service bench with state of the art grounding and static protection
WARNING: I am a highly experienced Technician (Engineer actually). If your not comfortable doing this then DONT
WARNING: Since this is using a lubricating cleaner remove the control from the unit do not try to just spray it 'in there'. If the cleaner gets on the back of the LCD display assembly it WILL leave run marks that wont go away. Also components or circuits may be damaged by over spray.
WARNING: I am not responsible for any inaccuracies in the description or steps provided.

I disassembled the unit (watch out for the speaker connector) and swung the head forward to gain access to the scroll knob control. Dont tug on the connections if in doubt disconnect the cable/flexes.
I then removed the front plastic housing and removed the scroll control. I then (using the straw that comes with most cleaners) carefully sprayed a SMALL quantity (a few drops Dont give the control a bath) of cleaner on the top of the scroll knob (thats not the front where the shaft is). I then worked the control rapidly left and right through several rotations. I then repeated the spray and work the control steps. I then re-assembled the unit and tested operation. Result the control is working 100% with no skipping or double steps.

That is my results I cannot guarantee that you will have the same ones. Finally Again read the warnings do this at your risk. If you damage the unit in anyway its your fault not mine or anyone elses.