| Models till 1993 |
| 1. To remove clamps and to unscrew three screws of fastening of a framework of glass. |
| 2. To unscrew screws and to uncover a back part of a combination of devices. |
| Models since 1993 |
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3. To unscrew two screws (are specified by arrows) fastenings of a frame of glass. |
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4. To unscrew two screws (are specified by an arrow) fastenings of glass of a combination of devices. |
| 5. To remove clamps of glass and glass. |
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6. To unscrew screws and to uncover a back part of a combination of devices. |
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7. To unscrew nuts (are specified by arrows) fastenings of contacts of devices. |
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8. To unscrew screws (are specified by an arrow) fastenings of measuring devices. |
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9. To remove measuring devices. |
| 10. To remove control bulbs, turning the holder of a bulb counter-clockwise. |