Orban OPTIMOD-FM 8600, Operating Manual

Page: 293 / 397

OPTIMOD-FM DIGITAL MAINTENANCE
4-9
c) Navigate to the
I
NPUT
/O
UTPUT
> O
UPUT
1
screen, Set controls as in the table
below:
Analog Out Level .................................................................... +10.0 dBu
Analog Output Source ............................................................... Xmitter
Analog Preemphasis .......................................................................... Flat
AES 1 Out Level ........................................................................ –2.8 dBFS
AES 1 Out Source ........................................................................ Xmitter
Sample Rate ............................................................................... 44.1 kHz
AES 1 Preemphasis ............................................................................. Flat
Word Length ........................................................................................ 20
Dither .................................................................................................. Out
`
d) Navigate to the
I
NPUT
/
OUTPUT
U
TILITIES
screen. Set the Multiplex Power
Threshold control to Off.
e) Navigate to
S
YSTEM
S
ETUP
. Select
T
EST
M
ODES
. Then Activate Bypass mode:
Navigate to the
B
YPASS
button and press
E
NTER
.
Set controls as in the table
below:
Mode ............................................................................................ Bypass
Frequency ...................................................................................... 400 Hz
Mod Level ....................................................................................... 100%
Mod Type ........................................................................................... L+R
Bypass Gain ....................................................................................... 0 dB
NOTE: Bypass defeats all compression, limiting, and program equaliza-
tion but retains the selected preemphasis (either 50
µ
s or 75
µ
s).
2. Test the power supply
A) If the power supply is entirely dead and the fuse is not blown, verify that the
primary winding of the power transformer is intact by measuring the re-
sistance of the power supply at the IEC AC line connector.
For 115-volt operation, the resistance should be approximately 7.6
Ω
.
For 230-volt operation, the resistance should be approximately 27
Ω
.
B) The green LED power indicator on the upper right of the front panel display
monitors the DC power supply outputs. If one or more power supply voltages
are out of tolerance, red flashes will report them according to the table be-
low. If there are multiple values out of tolerance, they are reported one after
another in a continuous loop, with one green flash indicating the beginning
of each count.
Number of Red Flashes Problem With
1 + unregulated supply
2 +15V or –15V
3 +5V or –5V
4 +5V Digital
5
Analog

Digital ground connection broken
6 DSP A +3.3V supply