Skanti TRP 9250, Техническое руководство, Страница: 155 / 289

1.7 Press "Prog" "31" "Enter". The frequency error on the actual receiver frequency
is shown in the receiver display and a clean 300 Hz tone should be heard in the
loudspeaker. After each error measurement, at intervals depending on the
magnitude of the receiver frequency, the display is updated and a short beep is
heard in the loudspeaker.
2. Realignment of Master Oscillator:
2.1 Locate the Master Oscillator adjustment hole in the metal shield of Synthesizer
Board 911. Use a small screwdriver to gently adjust the frequency.
2.2 Adjust the Master Oscillator until the displayed frequency error is as close as
possible to zero. A clean 300 Hz tone should be heard in the loudspeaker.
2.3 If the bar-graph in the display, indicating the received signal strength, is changing
rapidly by a large amount or the 300 Hz tone heard in the loudspeaker is not
clean choose another station with better reception quality.
2.4 Refit the top cover.
Replacement of Backup Battery
TRP 9250 uses standard 1.5 V alkaline batteries to back-up the memory when the power supply is
switched off. Use only the best quality for replacement to avoid leakage.
Skanti recommends:
DURACELL
Alkaline
1.5 V
MN1500 / LR6 / Size AA
3 pieces
The battery life time depends especially on temperature and working conditions, but is estimated
to 3 to 4 years.
Every time the power supply is switched on the capacity of the back-up batteries is checked. When
the capacity is becoming low the "Bat" annunciator in the display is switched on, showing that it is
time to replace batteries. If the capacity becomes critically low the "Bat" annunciator will flash,
indicating that memory contents may be lost when the power supply is switched off.
Note that only last set-up, user-programmable memory, Scan, Sweep and Sleep programs and
user-configurable parameters are lost with a low voltage back-up battery, and that TRP 9250 is fully
operational even without a back-up battery.
Battery Replacement:
Switch on the power supply to ensure no loss of memory contents when the battery pack is removed.
Remove the front cover of the Transceiver Unit. The back-up battery pack is located at the left side
of the chassis. Remove the battery pack. Change all three batteries and be sure to replace with
correct polarity. Refit the cover. The power supply may now switched off.
PREVENTIVE MAINTENANCE SERVICE
TRP 9250 TECHNICAL MANUAL 5-5