4-10
MAINTENANCE Orban Model 8400
Right Channel Balance 0.0 dB
DI REF VU –15.0 dBFS
c) Navigate to the Input/Output 2 screen, Set controls as in the table below:
Out Level +10.0 dBu
Output Feeds Xmitter
Pre-Emph Flat
Out Level –2.8 dBFS
Samp Rate 32 kHz
Pre-Emph Flat
Word Leng 20
Dither Out
d) Navigate to the Input/Output 4 screen. Set the Multiplex Power Threshold control
to
Off.
e) Navigate to System Setup. Select Test Modes. Then Activate Bypass mode:
Navigate to the
Bypass button and press Enter. 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 equalization,
but retains the selected pre-emphasis (either 50μs or 75μs).
2. Test the power supply
A) If the power supply is entirely dead and the fuse is not blown, verify that the pri-
mary winding of the power transformer is intact by measuring the resistance of the
power supply at the IEC AC line connector.
For 115-volt operation, the resistance should be approximately 7.6Ω.
For 230-volt operation, the resistance should be approximately 27Ω.
B) The green LED power indicator on the upper right of the front panel display moni-
tors 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 below. 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 +12V unregulated
2 +15V or –15V
3 +5V or –5V
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