3D Model	Overlay	Plan View
PCB			Top Bottom

Constructors should refer to the Component Overlays along with,
the Bill of Materials for the current value of all components, and
the General Construction Notes for general PCB assembly guidelines.

Before starting assembly, please read the ‘Slider Installation’ notes at the end of this document.

1. Assemble 5x Jack Carrier boards
2. Mount all the components on the component side of the main board. If possible, you should flush cut each leg before soldering on all the components that are within the slider footprint, if not then cut all these soldered joints to a maximum of 1mm above the PCB
3. Locate all the sliders in to their position but do not solder
4. Stand the M3x8mm spacers on the corners of the PCB. Fit the front panel over the sliders. Loose fit the M3x12mm screws to ensure that the panel is correctly position. Carefully grab the assembly squeezing the panel against the PCB and flip the assembly over and rest it on suitable spacers so that the sliders do not touch the work surface (two toilet roll tubes cleanly cut in half make ideal stands)
5. Solder one pad at each end of each slider taking note that the sliders legs should be flush with the PCB. When done, solder all the remaining legs
6. Turn the assembly over and remove the front panel
7. Insert the 5 sub-assemblies but do not solder
8. Locate the front panel by tilting the panel towards, and over the slider arms and then drop on to the sub-assemblies
9. Carefully raise the top end of the panel and slide an M3x8mm spacer on to the slider for the 218Hz band. Insert an M2x12mm screw and finger tighten
10. Repeat for the 1.5kHz and then the 61Hz and 5.2kHz sliders
11. Secure the pot and jacks with the supplied nuts and then carefully flip the assembly over and position on the support
12. Solder all the sub-assemblies in to position
13. Flip the assembly
14. Push the sliders for 61Hz, 218Hz, 1.5kHz 5,2kHz to their top positions and then tighten the four screws firmly - but do not overtighten

Slider Installation

Although the main component installation on to the main PCB is straightforward, installation of the sliders is trickier and requires a bit of manual dexterity and patience.

The sliders need to be square to the pcb in both the ‘A’ plane and the ‘B’ plane.

Errors in the ‘A’ alignment will result in the slider being higher at one end that the other. This will not affect the operation of the slider but may look cosmetically ‘untidy’ if all the sliders have varying tils in different directions.

Errors in the ‘B’ alignment will not affect the electrical operation of the slider but may cause the slider shafts to rub against the slots in the panel resulting in poor slide action.

Although the sliders have support pins, these cannot be used in this assembly due to the fact that we have exposed solder pads for components mounted on the underside of the pcb in the region of the sliders.

In the current assembly instructions we utilise the fact that when the assembly is inverted i.e. front face of the panel facing down, that the sliders will rest against the back of the front panel and so should, naturally sit square to the pcb.

An alternative approach that users may wish to try is to utilise some of these components as spacers themselves. There are 2 resistors under each slider than could be mounted on the same side of the pcb as the sliders. If mounted firmly and squarely to the pcb then the sliders can ‘sit’ on these resistors. It should be possible to tack a slider leg at each end with the pcb in its normal orientation and to then finish full soldering without going through the fiddly process of aligning of the sliders. The resistors to use in this approach are:-

Top row - R109, R113, R117, R121, R125, R129, R133, R138, R142, R148
Bottom row – R106, R110, R114, R118, R122, R126, R130, R134, R140, R145