4-6
MAINTENANCE
ORBAN MODEL 9300
Accurate to ±0.1%.
Oscilloscope
DC-coupled, triggered sweep, with 5M Hz or greater vertical bandwidth.
Two 620
±5% resistors.
Optional: Audio Precision System 1 (without digital option) or System 2 (for digi-
tal tests).
It is assumed that the technician is thoroughly familiar with the operation of this
equipment.
This procedure is useful for detecting and diagnosing problems with the 9300's per-
formance. It includes checks of frequency response, noise and distortion perform-
ance, and output level capability.
This performance audit assesses the performance of the analog-to-digital and digi-
tal-to-analog converters and verifies that the digital signal processing section (DSP)
is passing signal correctly. Ordinarily, there is a high probability that the DSP is per-
forming the dynamic signal processing correctly. There is therefore no need to
measure such things as attack and release times — these are defined by software
and will automatically be correct if the DSP is otherwise operating normally.
It is often more convenient to make measurements on the bench away from high RF
fields which could affect results. For example, in a high RF field it is very difficult to
accurately measure the very low THD produced by a properly operating 9300 at
most frequencies. However, in an emergency it is usually possible to detect many of
the more severe faults that could develop in the 9300 circuitry even in high-RF envi-
ronments.
See the assembly drawings in Section 6 for component locations. Be sure to turn the
power off before removing or installing circuit boards.
Follow these instructions in order without skipping steps.
Note:
To obtain an unbalanced output, jumper pin 1 (ground) to pin 3, and measure
between pin 1 (ground) and pin 2 (hot).
Note:
All analog output measurements are taken with a 620
±5% resistor tied be-
tween pin 2 and 3 of the XLR connector.
1.
Prepare the unit.
A)
Use the front panel controls to set the 9300's software controls to their de-
fault settings, as follows:
a)
Navigate to
S
ETUP
>
IO
C
ALIB
>
A
NLG
I
N
C
ALIB
. After writing down the old
settings (so you can restore them later), set controls as follows:
Input ............................................................................................. analog
AI Ref VU ................................................................................... +4.0 dBu
Summary of Contents for OPTIMOD-AM 9300
Page 1: ...Operating Manual OPTIMOD AM 9300 Digital Audio Processor Version 2 0 Software...
Page 7: ...Operating Manual OPTIMOD AM 9300 Digital Audio Processor Version 2 0 Software...
Page 178: ...3 46 OPERATION ORBAN MODEL 9300...
Page 200: ......
Page 221: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 21...
Page 222: ...6 22 TECHNICAL DATA ORBAN MODEL 9300 CONTROL BOARD PARTS LOCATOR...
Page 228: ...6 28 TECHNICAL DATA ORBAN MODEL 9300...
Page 229: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 29 I O DSP BOARD LEFT AND RIGHT ANALOG INPUTS...
Page 230: ...6 30 TECHNICAL DATA ORBAN MODEL 9300 I O DSP BOARD ANALOG OUTPUTS...
Page 231: ...OPTIMOD AM DIGITAL TECHNICAL DATA 6 31...
Page 238: ...6 38 TECHNICAL DATA ORBAN MODEL 9300 FRONT VIEW REAR VIEW FRONT PANEL PARTS LOCATOR DIAGRAM...
