Apr 272010
With the recent experience of having to get a Sony 5000 Fw tuner fixed and being able to see it taken apart in front of me has provided me with the first hand knowledge of how the front fascia of a Sony 5130 tuner is held together. The fixing method is very similar to the Sony 5000Fw tuner, as it also is to the other 5000 series Sony tuners. So armed with this newly obtained knowledge, I have been tackling a problem that seems so far, to only exist with one brand of tuner i.e Sony.
So”What is this problem ?” I hear you ask…well dirt behind the tuning scale. There is nothing worse in my opinion than the soft glow of VU meters and a pretty display, being ruined by copious amounts of dirt, dust and hairs (oh yes hairs !). Now thirty years or more of use is bound to result in dirt build up but the amount behind Sony tuner displays of the 70s has to be seen to be believed. So suitably annoyed, at a much less than spotless display and now in possession of the required skills to disassemble some of Japan’s best tuners I have set to cleaning this particular Sony and a number of other Sonys in for review.
As an additional preview to the second part of the Leak Trough-Line compared review: The Japanese are coming I present this detailed description of how to clean a Sony 5130 tuner.
What you will need to complete such a task (other than knowing what you are doing) is, a clean clear table top, with soft material top (to prevent scratching your pride and joy), a good selection of screw drivers, cleaning tools including cotton wool buds,soft wide brush, cotton wool pads, tissue paper, Tesco Anti-Bacterial multi-surface cleaner(fabulous at lifting dirt quickly, and so far has not caused and adverse reactions with any tuner I have cleaned)…oh yes and good lighting conditions and a  powerful torch (this will help you spot areas of glass that are still smeared.)
Firstly two warning…never assume that the material the tuning scale is made up from and applied to the glass is stable. It is entirely possible that this transfer or paint may flake or rub off. Clean round it carefully and never apply a fluid to it. I always clean the area the scale is on (so far always on the reverse of the glass display) dry, its better to be safe rather than sorry. Its okay to use fluid to clean the top surface but ensure none gets onto the back.
Warning number two….always make sure you mark the position of the tuning scale. It would be a shame to replace it only to find it was no longer lined up. Before removing the glass (all the Sony tuners I have are fitted with glass scales) or plastic scale use a thin strip of masking tape to line up with the scale and the surface it is mounted on.
With the tuner switched on, the amount of crap illuminated, completely ruined the look of this Sony 5130. So I set about removing the tuning knob, selector knob,headphone volume control knob (held onto shanks by a recessed  screw), and  switch tops (friction fitted onto a flat metal shank) I then able to remove the fascia. Luckily the switch tops just pop off by hand and the knobs secured by crub screws all unscrewed easily.
Once the fascia was removed (three screws holding it in place on the top, and three on the bottom ) the amount of crap, that had built up over the years was very evident, as you can see in the two photos below.
I used a cotton bud and soft brush to remove all the dirt from the metal work. It was not too hard to remove, but quite a lot was trapped under the glass, and on the metal work behind it.
This particular tuner has two layers of glass covering the tuning scale. The main display glass was smeared on the front and the back. With the fascia removed I cleaned both the metal work and glass, back and front with Tescos fluid, applied by a cotton pad and bud (this allows you to apply soft pressure to remove stubborn stains but keep the amount of fluid under control. You want to use very little so the buds should only be slightly damp).
With this tuner, and some other models in this brands past the slots that the switches poke through are damped with strips of velvet applied behind the fascia. So when cleaning the area behind the fascia you must watch out not to dampen the velvet strips as they may come off if you get them damp. If this happens Copydex glue will work to re-stick them down.
Note velvet damping pads, which surround the slots the switches poke through.

With the dirt and smears removed and after drying I placed the fascia in to a plastic bag which I sealed (this to keep new dust off it).
The Sony 5130 Tuner fascia and various knob and switch tops.
With the fascia clean, and bagged, I had to remove the metal bands that hold the glass tuning scale in place. With those removed the rubber slots which hold/damp the scale, prized gently from the top edge came loose, allowing access to clean both sides of the scale.
You can see the dirt collected on the tip of the cotton bud (done dry)

After quite a long period of careful cleaning the scale was also placed in a  bag which I sealed.
I then turned my attention to the metal work which sits behind the glass. As its black, it shows the dirt up badly. I damp cleaned the VU meter glass, being careful not to apply too much fluid. I then dusted the metal work and tuning arm slot.
You can see the Stereo indicator and the right side display illuminator lamp (it looks like a fuse. These fail a lot)

Everything was now ready to re-assemble the display. This was done quickly to minimise new dust build up. First the glass tuning scale, then the main fascia. This needs to be lined up carefully, to avoid scratching or damaging the control knob shafts and switch shanks. Lining it all up and making sure the headphone socket goes into its hole, is a little tricky but once done it screws back together quickly. Leave the screws slightly loose so you can check fascia alignment, once checked/done tighten it all up. The last thing to do is reattach the bottom and top plates, making sure to leave no gap along the top edge of the fascia and lid.
The reassembled SONY 5130….Magic !
© Text and Photos  Copyright 2010 Adventures in High Fidelity Audio.
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