Autohelm Inboard Autopilots (ST6000 and ST7000 systems) Service ...

Autohelm1. DescriptionThe Z124 control unit is Seatalk compatible and consists of a single PCB built usingsurface mount technology. The unit can be functionally tested (figure 3) without theuse of special equipment other than a seatalk cable with a seatalk plug at one endand bared cores at the other.If a control unit or its PCB are replaced the display contrast will require re-setting.This should be carried out aboard the vessel following the instructions given insection 3.2. DismantlingAfter removing the unit from the boat and returning to the service centre. Place facedown on a clean, light foam surface. Preferably conductive.1. Unscrew and remove the 4 case securing screws from the rear cover. Push eachcable loom assembly back through its grommet so as to obtain working clearance tothe PCB (fig 1)Note: if cables are very tight in grommets apply a small smear of silicon grease toouter sheath, (grease can be wiped off after reassembly).If removing the PCB assembly it will be necessary to de-solder the cables from thePCB. Great care should be exercised when de-soldering so as not to damage thepads on the PCB.2. Unscrew and remove the 9 screws which secure the PCB to the facia.Note: Do not at this stage remove the screws which secure the LCD assembly to thePCB. Refer to figure 1 to clarify which screws to remove.3. Before removing the LCD ensure that lint free and preferably anti static finger cotsare worn to prevent the LCD or elastomers getting dirty or greasy.4. Unscrew and remove the 3 LCD housing retaining screws (fig 1). Be careful to holdthe LCD surround, LCD, and diffuser when dismantling. Lift away from the PCB andstore.3. Re-assemblyRe-assembly is a straight reversal of the above procedure but note the followingpoints:-1. Ensure the LCD is correctly orientated relative to the PCB (fig 1).2. Ensure the diffuser is correctly orientated relative to the LCD and PCB (fig 1).3. Note the correct orientation of the various looms and core colours to the PCB pads(fig 1).4. Ensure that the board is tightened down sequentially to ensure the load is evenlyspread.SeaTalk Service Manual 3