Orban OPTIMOD-FM 8600, Operating Manual

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4-14
MAINTENANCE ORBAN MODEL 8600
N) Measure pilot tone injection: Using the stereo monitor, verify that pilot tone
injection is between 8% and 10% modulation. If it is outside these parame-
ters, it can be adjusted by navigating to
I
NPUT
/
OUTPUT
and then to screen
I
NPUT
/O
UTPUT
> C
OMPOSITE
. Adjust
P
ILOT
L
EVEL
as necessary.
O) If the measured pilot level varies by more than a few tenths of percent from
the pilot level indicated, this indicates there may be a problem elsewhere—
either in your measuring setup, or with the 8600.
P) Measure pilot tone frequency: With the
M
OD
. L
EVEL
still set to 0.0%, connect a
frequency counter to either of the 8600’s composite outputs. Verify that the
pilot tone frequency is 19,000 Hz
±
1 Hz.
9. Optional tests.
A) You can test each GPI input for functionality in the obvious way, by pro-
gramming a function for it and then verifying that the function executes
when you activate the input. To program a GPI input, navigate to
S
YSTEM
S
ETUP
> N
ETWORK
/ R
EMOTE
1
.
B) You can test the RS232 Port 1 for functionality by verifying that you can con-
nect to a PC through a null modem cable. See
Installing 8600 PC Remote Con-
trol Software on page 2-66.
10. Return OPTIMOD-FM to service.
A) Remove the 620
Ω
resistors connected across the outputs.
B) Navigate to the
I
NPUT
/
OUTPUT
screen and restore your normal operating pa-
rameters in all four screens, using the notes you made in step (1.B)a) on page
4-8.
C) Navigate to
S
YSTEM
S
ETUP
. Select
T
EST
M
ODES
. Then activate Operate mode:
Navigate to the
O
PERATE
button and press
E
NTER
.
D) Recall your normal operating preset.