Sony 125x/127x

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      >> Layout and Setup Tips 
      >> Spacer Mod for Large & Centered Rasters
      >> G2 Voltage Adjustment (White Balance)
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The front of the set shows the low voltage main power supply and the HV regulation board mounted on top of the LVPS. Failure of these two modules are relatively rare, and the power supply and HV regulation board needs to be pulled out to remove the lenses from the tubes. There is one screw on each side of the LVPS, then the LVPS pulls out about 6”.

To the left of the LVPS is the HV board. This contains two HV transformers and a HV combiner. Failure of these units is also rare, and this board assembly also needs to be removed to get the lenses off. The HV block assembly has three screws that hold it to the chassis, then it pulls out similar to the LVPS.

While not shown, each lens frame is held to the chassis by four 8mm brass nuts. Remove the nuts, and the lens and frame come right off. There is about an 1/8” air gap between the tube and the lens, and dust will collect in the gap, causing halos or poor focus. Clean the face of the tube with a soft cotton cloth and water. The back of the lens scratches quite easily, so a paper towel and a cleaning solution is not a good idea.