8. APPENDIX 1
INTERNAL SELECTION SWITCHES
A1.1. GENERAL
The user options and settings for the SI9500 are changed using switches on
the circuit boards inside. This appendix deals with gaining access, locating
the correct switch and the function of each switch.
A1.2 ACCESSING THE SWITCHES
To expose the switches it is necessary to remove the baseplate, however,
this will expose live parts and therefore represents and electrical shock
hazard.
BEFORE REMOVING THE BASE PLATE IT IS ESSENTIAL THAT
THE UNIT IS UNPLUGGED FROM THE MAINS SUPPLY.
The baseplate can be removed after undoing the six 4mm x 12mm to socket
head screws using a 2.5mm hex wrench (one is provided).
The baseplate is attached to an earth cable, this should be left intact and the
baseplate moved to one side so the internal circuits can be seen.
Care should be taken not to damage the sealing gasket on the bottom flange.
A1.3 VOLTAGE SELECTION
The voltage selection switch is a black slider switch mounted on the circuit
board in the vicinity of the main cable entry. The circuit board is marked with
110 and 220 showing the positions of the switch for 110 volts and 220/240
volts. The 220V position is with the slider towards the rear of the unit.
A1.4 FUSE REPLACEMENT
The working fuse is in a black fuse holder near to the mains cable entry. It is
changed by gripping the top and sides of the fuse holder between thumb and
forefingers and pulling away from the base. A spare fuse has been provided,
mounted in an unused fuse holder adjacent to the working fuse.
The correct fuse size is a 20mm cartridge fuse rated at 250mA anti-surge.
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