KI 025 UM-5
21
Maintenance
Changing the Batteries or Microphone
You will need 4 x AA size rechargeable batteries with solder tags and
50 mA charge current, or get a (side-by-side) battery pack with solder
terminals. These can be obtained from Kingfisher. If you have bought
separate batteries, solder them in a ‘flat-four’ arrangement, and put
insulation around the battery pack. Note: do not attempt to solder on
batteries without solder tags, or internal damage will result.
Open the instrument as instructed on page 19 and get the two
instrument halves completely separated. You will see that the battery
clamp is held in 3 places. The battery clamp also houses the
microphone in a rubber grommet.
Unscrew the two screws (which also secure a handle) and the one
bolt that is secured through to the connector housing. Ensure first
that the connector housing cover is open so that you are able to
remove the securing nut. You should then be able to remove the
battery clamp, and access the batteries or microphone.
Change the batteries or microphone as required, and re-assemble.
Be careful with both items to get the polarity of the wiring correct.
The microphone is a standard electret type, with -65 dB sensitivity,
10 mm diameter.
Replacements are available from Kingfisher.
Fuses
There are two internal fuses, 20 mm fast-acting types, with functions
as follow:
F1,
200 mA is the battery charger protection fuse;
F2,
1 AMP is the battery protection fuse.
If F1 has been blown, check your charging arrangements.
If F2 has been blown, either the fuse was faulty, or the instrument
must be returned for service (eg. internal short circuit).
To change the fuses, follow the instructions to open the instrument,
and they are easily accessible on the pcb.
The Buzzer Frequency
The buzzer circuit consists of a single oscillator, and tone detector,
the frequency of which is adjustable via a single potentiometer.
To adjust, open the unit (as in Section ‘Opening the Instrument’), turn
it on and use a frequency meter 0V connected to eg. the pcb.
The maximum frequency deviation allowable between sets is ± 4 %.
This circuit should not need adjustment in normal use. It is factory
set to 2 KHz.
Содержание KI 025 Series
Страница 1: ...OPERATING MAINTENANCE GUIDE KI 025 Series Optical Talk Set ...
Страница 5: ...KI 025 UM 5 3 Figure 1 KI 025DD Optical Talk Set ...
Страница 10: ...KI 025 UM 5 8 Figure 2 KI 025DD Fibre Optic Talk Set ...
Страница 13: ...KI 025 UM 5 11 Performance Verification Tests Party Line Connection 3 1 2 ...
Страница 16: ...KI 025 UM 5 14 Figure 3 KI 025DD Optical Talk Set Internal View ...
Страница 27: ...KI 025 UM 5 25 Notes ...
Страница 28: ...KI 025 UM 5 26 Notes ...
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Страница 30: ...KI 025 UM 5 28 Notes ...
