Yamaha SB168-ES Service Manual page 55

3-7. ANALOG Test
Contents
Checks +48V voltage.
Checks GAIN setup.
Conducts loopback test of 9 ch to 16 ch.
Checks MUTE setup.
<Parameters>
Item Gain
MUTE OFF +10dB
MUTE ON +10dB
GAIN MIN +10dB
GAIN MAX -62dB
AD9-16ch GAIN MIN +10dB
AD9-16ch GAIN MAX -62dB
+48V ON -62dB
+48V OFF -62dB
Precautions
Inspection patch should be changed and AVS-ESMonitor runs
automatically to change the patch as necessary.
•
Screen Example
+48V DA Mute Thru ch
OFF OFF INPUT 1ch - 8ch
OFF ON INPUT 1ch - 8ch
OFF OFF INPUT 1ch - 8ch
OFF OFF INPUT 1ch - 8ch
OFF OFF INPUT 9ch - 16ch
OFF OFF INPUT 9ch - 16ch
ON OFF INPUT 1ch - 8ch
OFF OFF INPUT 1ch - 8ch
ANALOG test criteria
Item
Judged as OK if the output level is +4 dBu when the
MUTE OFF MUTE is OFF in the MUTE signal (OUTPUT 1) test.
(See page 74)
Judged as OK if the output level is -25 dBu or less
MUTE ON when the MUTE is ON in the MUTE signal (OUTPUT
1) test. (See page 74)
Judged as OK if the GAIN +10 dB test result is
GAIN MIN
positive. (See page 75)
Judged as OK if the GAIN -62 dB test result is
GAIN MAX
positive. (See page 75)
Judged as OK if the GAIN +10 dB test result is
AD9-16ch GAIN MIN
positive. (See page 75)
Judged as OK if the GAIN -62 dB test result is
AD9-16ch GAIN MAX
positive. (See page 75)
Judged as OK if the voltage is between DC33.6V and
+48V ON 36.1V when the +48V MASTER switch is ON in the
Phantom power (INPUT 1 and 9) test. (See page 75)
Judged as OK if quickly discharged when the +48V
+48V OFF MASTER switch is turned OFF in the Phantom
power (INPUT 1 and 9) test. (See page 75)
Output result
• Normal condition
Displays in the output window as follows.
Item Text indication
MUTE OFF OK: MUTE OFF
MUTE ON OK: MUTE ON
GAIN MIN OK: GAIN MIN
GAIN MAX OK: GAIN MAX
AD 9-16ch GAIN MIN OK: GAIN MIN
AD 9-16ch GAIN MAX OK: GAIN MAX
+48V ON OK: +48V ON
+48V OFF OK: +48V OFF
• In case of failure
Displays in the output window as follows.
Item Text indication
MUTE OFF NG: MUTE OFF
MUTE ON NG: MUTE ON
GAIN MIN NG: GAIN MIN
GAIN MAX NG: GAIN MAX
AD 9-16ch GAIN MIN NG: GAIN MIN
AD 9-16ch GAIN MAX NG: GAIN MAX
+48V ON NG: +48V ON
+48V OFF NG: +48V OFF
SB168-ES
Judgment criteria
55