Orban OPTIMOD 6200, Operating Manual

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OPTIMOD MAINTENANCE
4-11
The ripple and noise should not exceed 50mVp-p.
4. Test Analog ±5 volt supply (Power Supply Board).
A)
Measure the 5 volt supply with the DVM. Verify the presence of +5 volts
(±0.25V).
The 5 volt supply appears between TP2 and ground test point TP3
on the Power Supply Board.
B) Using the oscilloscope, measure the total ripple and noise on the +5 volt supply.
The ripple and noise should not exceed 50mV.
C)
Measure the analog
−
5 volt supply with the DVM. Verify the presence of
−
5 volts
(±0.25V).
The analog
−
5 volt supply appears between TP5 and ground test point TP3
on the Power Supply Board.
D)
Using the oscilloscope, measure the total ripple and noise on the
−
5 volt supply.
The ripple and noise should not exceed 50mV.
5. Check Analog Input Clip Level.
A)
Verify 6200 software controls are set to their default settings. (Refer to page 4-9.)
B) Press Setup button to re-access Setup menu.
C)
Press
TEST
soft key to access Test menu.
D)
Recall bypass preset: Press
MODE
soft key, use the control knob to scroll to by-
pass, then release the MODE soft key.
Bypass defeats all compression, limiting, and program equalization, but re-
tains
MAX LPF
frequency setting.
E) Connect the oscillator to the Left Input XLR connector.
F)
Inject the Left Input XLR connector with a level of +20dBu (matching the
AI CLIP
level setting) at 1kHz.
G) Connect the audio analyzer to the 6200's Left Monitor (output) XLR connector.
H)
Verify that the output is +12.6dBu ±1.5dB.
I)
Apply 0dBu to the input of the unit.
J) Vary the AI CLIP level control from +27.0dBu to +5.0dBu and verify the follow-
ing Left Monitor (output) level readings: