Kingfisher KI 025 Series, Operating & Maintenance Manual

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KI 025 UM-5
20
Maintenance
Opening the Instrument
1. Read previous section before starting;
2. Place the instrument face down on a bench, and remove the 6
screws holding the baseplate to the instrument body. Do not
turn the instrument over, or let the baseplate fall away;
3. Hold the baseplate onto the unit, and place the instrument on its
side with the connector nearest the bench;
4. Gently open the baseplate by pulling on the top edge. The unit
should open easily and will look like Fig 3.
Note the position of the fibre optic connector, and internal fibre. Most
of the fibre optic components and the opto-electronic devices sit
under the pcb.
To further separate the unit, unplug the ribbon connector, and undo
the optical connector. To completely separate the top and bottom
halves, cut the cable ties that hold the unit together. It is important to
replace these ties during re-assembly, because thy stop accidental
fibre breakage during subsequent instrument dismantling.
You will now have two separate items on the bench, eg. The p.c.b.
and optical components in one part and the main body, operator
controls etc. in the other part. In this way it is easy to repair the items
on the main body, with minimal risk of damage to the fibre
components.
Re-assembly
This is the reverse of the previous section.
Be particularly careful to:
1. Replace the cable ties;
2. Ensure that no fibre is protruding before assembling the two
halves, or the fibre will get cut during assembly.
Headset Operation
The headset connector is wired as follows (polarity unimportant):
‘Outside’ connector pin pair: microphone
'Inside' connector pin pair: speaker (polarity not important)
The all black headsets use a magnetic type microphone, which can
be wired either polarity. If the instrument gets problems with acoustic
feedback in a new headset, re do the headset connector with one
pair of connections reversed.