Apollo SL40 User Manual

Troubleshooting
Apollo SL40 Field Maintenance Manual
9
the large knob to select the NOISE function and view the receive noise level of the
selected frequency. The value will change constantly, and has a range between 0 and 255
and an RFLVL in the mid teens (14 to 17). On the service bench with the antenna port of
the SL40 dummy loaded, NOISE should be between 100 and 125. If the SL40 is
connected to the aircraft antenna and there is no carrier on the channel, expect the reading
to be the same or slightly lower. To confirm that there is no carrier on the monitored
channel pull the squelch knob and listen.
T
EST
M
ODE
O
PERATION
The test mode allows the SL40 display and controls to be tested with the unit still
mounted in the aircraft. The test mode is also used to access certain test and calibration
functions used during manufacture and at the service center. Do not change or adjust any
functions accessed in the test mode unless specific instructions are provided in this
manual. If the SL40 fails either the Display or Controls test, remove the unit from the
aircraft and refer to the Disassembly procedures on Page 20 for instructions on removing
the Com Display board.
T
EST
M
ODE
A
CCESS
Enable the built-in test mode by pressing the ⇔ (flip/flop) and
RCL
buttons while
switching the unit on.
G
ENERAL
O
PERATION
In test mode operation, the
LARGE
knob is used to select the different test functions, the
SMALL
knob is used to select additional pages for each test function. In general, the only
test functions that will be used at the Field Maintenance level are the Display test and the
Controls test. Do not modify any setting displayed while in the test mode.
T
EST
M
ODE
P
AGE
The “Test Mode Page” is the first page displayed in the test mode
TEST MODE
When this page is displayed, pressing the
MEM
button will return the COM to normal
mode operation.
D
ISPLAY
T
EST
F
UNCTION
This function is used to test the display and LED indicators.
DISPLAY TEST
Press the
MEM
button to execute the display test. The display will sequence through the
test by turning on the first four characters, the 2nd four, the 3rd four, and then the last
four characters. Once the sequence is complete, “DISPLAY TEST” will be displayed.

Apollo SL40 Specifications

General

Brand	Apollo
Model	SL40
Category	Transceiver
Language	English