4-8
MAINTENANCE Orban Model 8400
the remaining hole). Position over this standoff the RFI contact spring you removed
in step (11.B) on page 4-4.
G) Fit the front panel assembly into the front of the chassis, bottom first. Leave the
panel tilted at an angle of approximately 45 degrees and reconnect the four front-
panel cables.
H) Mate the front panel assembly to the chassis, and fasten it using the six screws you
removed earlier.
21. Replacing the Input/Output Assembly
A) Carefully insert the input/output assembly through the back panel so that it plugs
cleanly into the motherboard.
B) Replace the six Phillips screws holding the input/output assembly to the rear panel.
22. Replacing the Top Cover.
Place top on the unit and reattach the 18 Phillips screws.
Field Audit of Performance
Required Equipment:
• Ultra-low distortion sine-wave oscillator/THD analyzer/audio voltmeter
(With verified residual distortion below 0.01%. Sound Technology 1710B;
Audio Precision System One, or similar high-performance system.)
(The NAB Broadcast and Audio System Test CD is an excellent source of
test signals when used with a high-quality CD player.)
• Spectrum analyzer with tracking generator
(Stanford Research Systems SR760 or equivalent. Alternatively, a sweep gen-
erator with 50-15,000 Hz logarithmic sweep can be used with an oscilloscope
in X/Y mode, or you can use a computer-controlled test set like the Audio Pre-
cision System One. )
• Digital voltmeter
Accurate to ±0.1%.
• Oscilloscope
DC-coupled, triggered sweep, with 5M Hz or greater vertical bandwidth.
• Two 620Ω ±5% resistors.
• Optional: Audio Precision System 1 (without digital option) or System 2 (for digital
tests).
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