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A
B - P
PPENDIX
The SL50/60 unit is designed to not require any regular general maintenance except as
included in this section.
L
B
ITHIUM
ATTERY
The internal keep alive battery will require replacement after 4 to 6 years. Regular planned
replacement is not necessary. The SL50/60 will display a "low battery" message when
replacement is required. Once the low battery message is displayed, the battery should be
replaced within 1 to 2 months. If the battery is not replaced, the internal ram memory and the
system clock information will be lost.
To replace the battery, remove the SL50/60 from the aircraft, remove the top cover, and
replace the battery. Make sure to insert the battery in the correct polarity. Replace the top
cover, re-install the unit in the aircraft, and verify unit operation.
Battery replacement should be done only by the II Morrow factory or by a trained technician.
Note: The battery is to be replaced only with II Morrow part #148-1702, or a
II Morrow approved equivalent.
The battery may explode if mistreated. Risk of fire, explosion, and burns. Do
not recharge, disassemble, heat above 100°C, or incinerate.
Dispose of batteries promptly. Keep away from children.
Be sure the battery is inserted in the right direction.
E
C
QUIPMENT
ALIBRATION
The SL50/60 design requires very few adjustments or calibration to be made. In fact, there are
no internal manual adjustments.
R
O
EFERENCE
SCILLATOR
The reference oscillator frequency should be checked approximately every 3 to 5 years to
ensure the units transmit frequency is within allowable tolerance.
The oscillator frequency can be checked by connecting the transmitter output through an
appropriate load to a calibrated frequency counter. The transmit frequency should be within
15ppm of the selected channel frequency. Contact the II Morrow factory for instructions on
adjusting the frequency if required.
C
LEANING THE
The front bezel, keypad, and display can be cleaned with a soft cotton cloth dampened with
clean water. DO NOT use any chemical cleaning agents. Care should be taken to avoid
scratching the surface of the display.
Apollo SL50 / SL60 Installation Manual
ERIODIC
R
EPLACEMENT
Caution
F
P
RONT
ANEL
M
AINTENANCE
Periodic Maintenance
41
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