4-12
MAINTENANCE
ORBAN MODEL 8300
NOTE:
The recommended Belar monitor is the only instrument we have
encountered that can accurately measure the performance of the 8300’s
stereo encoder. With most older-technology monitors, you will be meas-
uring the performance of the monitor, not the 8300’s encoder. (Of
course, we have not evaluated every monitor on the market.)
B)
On the 8300, navigate to
S
ETUP
/
T
EST
.
C)
Set the
M
ODE
to
T
ONE
.
D)
Set the test tone parameters as follows:
Tone Freq...........................................................................................400 Hz
Tone Lvl................................................................................................. 91%
Tone Chan .............................................................................................. L+R
Pilot .......................................................................................................... On
You will have to press the
N
EXT
button to access all of these parameters.
E)
Navigate to
S
ETUP
/
S
TEREO
E
NCODER
.
F)
Set the
C
OMP
1
L
VL
control
to make the stereo monitor read
100%
total modu-
lation.
G)
Navigate to
S
ETUP
/
T
EST
to access the 8300’s tone oscillator parameters
.
H)
Measure the L–R level on the stereo monitor at several frequencies, in units of
dB below 100% modulation. This is the main channel to subchannel crosstalk.
It should not exceed –70 dB, 50-15,000 Hz.
I)
Set the
T
ONE
C
HAN
to
L–R
. (You will have to press the
N
EXT
button to access
this setting and then the
P
REV
button to return to the
T
ONE
F
REQ
control.)
Measure the L+R level on the stereo monitor at several frequencies, in units of
dB below 100% modulation. This is the subchannel to main channel crosstalk.
It should not exceed –70 dB, 50-15,000 Hz.
J)
Set the
T
ONE
C
HAN
to
L
EFT
. Measure the Right level on the stereo monitor at
several frequencies, in units of dB below 100% modulation. This is left-into-
right stereo separation. It should not exceed –60 dB, 50-15,000 Hz.
K)
Set the
T
ONE
C
HAN
to
R
IGHT
. Measure the Left level on the stereo monitor at
several frequencies, in units of dB below 100% modulation. This is right-into-
left stereo separation. It should not exceed –60 dB, 50-15,000 Hz.
L)
Set the
T
ONE
C
HAN
to
L–R
and the
T
ONE
F
REQ
to
5000.0
H
Z
. Measure the 38
kHz subcarrier suppression on the stereo monitor. It should not exceed –60
dB.
M)
Measure the Pilot Modulation on the stereo monitor. It should read 0%.
N)
Set
S
ETUP
/
S
TEREO
E
NCODER
/
C
OMP
1
L
VL
to 0.0%. Measure the de-emphasized
noise at the left and right outputs of the stereo monitor. It should not exceed
–80 dB below 100% modulation.
O)
Repeat steps (D) through (N) for the 8300’s
C
OMPOSITE
O
UTPUT
2.
(Use the
C
OMP
2
L
VL
control instead of the
C
OMP
1
L
VL
control.)
Summary of Contents for 8300J
Page 1: ...Operating Manual OPTIMOD FM 8300 Digital Audio Processor Version 2 1 Software...
Page 7: ...Operating Manual OPTIMOD FM 8300 Digital Audio Processor Version 2 1 Software...
Page 24: ......
Page 94: ...2 46 INSTALLATION ORBAN MODEL 8300 This page intentionally left blank...
Page 190: ......
Page 204: ......
Page 246: ......
Page 247: ...OPTIMOD FM DIGITAL TECHNICAL DATA 6 29...
Page 254: ...6 36 TECHNICAL DATA ORBAN MODEL 8300 CPU Module...
Page 260: ...6 42 TECHNICAL DATA ORBAN MODEL 8300 8300 RS232 BOARD PARTS LOCATOR...
Page 262: ...6 44 TECHNICAL DATA ORBAN MODEL 8300 8300 POWER SUPPLY PARTS LOCATOR...
Page 264: ...6 46 TECHNICAL DATA ORBAN MODEL 8300 8300 I O BOARD PARTS LOCATOR...
Page 270: ...6 52 TECHNICAL DATA ORBAN MODEL 8300 DSP BOARD PARTS LOCATOR DRAWING 32170 000 14...
Page 278: ...6 60 TECHNICAL DATA ORBAN MODEL 8300 8300 DISPLAY BOARD PARTS LOCATOR...
Page 279: ...OPTIMOD FM DIGITAL TECHNICAL DATA 6 61 DISPLAY BOARD...
