Yamaha AW-2400 Service Manual page 64

AW2400
1-7. Upgrading Software (FIRM OS)
If the version of the software (FIRM OS) is not the latest
one, the software (FIRM OS) should be upgraded to the
latest one.
1-7-1.How to Check the Version
Turn on the power, and keep pressing the [UTILITY] key
when the YAMAHA logo is shown on the LCD and the
versions of BOOT OS and FIRM OS installed will be shown
on the LCD.
AW2400
Copyright (C) 2005 YAMAHA
BOOT OS : V **.**
FIRE OS : V **.**
BUILD DATE 2005/**/** hh:mm:ss
1-7-2.Upgrading Procedure
Refer to "How to upgrade the program" for upgrading
procedures. (See page 92.)
2. Inspection in the Diag Mode
Perform in the "General Inspection" mode. (Do not
select the inspection items.)
1
UTILITY
How to Start
While holding down the [UTILITY] and [TR SEL 1] keys
simultaneously, turn on the power.
2-1. PHANTOM DC
(1) Short-circuit the pin 2 and pin 3 of the XLR connector
and connect a 10 kΩ load between the pins 1-2.
(2) Check that voltage between the both ends of the 10
kΩ load is DC33.1 V~DC37.6 V when the PHANTOM
1-4 SW on the rear panel is turned on.
(3) After checking the voltage, check that discharge starts
on turning off the PHANTOM 1-4 SW.
(4) Check the INPUT 5 in the same way as INPUT 1.
Use the PHANTOM CH 5-8 SW, instead, for the INPUT 5.
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2-2. AD/DA
(1) Use 20 kHz LPF when measuring the distortion.
(2) Use the IHF-A FILTER when measuring noise level
and measure the average level.
Short-circuit the pin 2 and pin 3 of the XLR connector
for INPUT1~8 at 150 Ω when measuring noise level.
2-2-1.INPUT 1(BAL XLR)
Parameters: Measure with INPUT 1 → STEREO L.
q LINE Gain
Input frequency Input level Specified output level Permitted range
1 kHz +4 dBu
w LINE Maximum Output
Input frequency Specified output level Permitted range (distortion factor)
1 kHz +24 dBu
e LINE Distortion
Input frequency Input level Permitted range (distortion factor)
1 kHz +4 dBu
r LINE Frequency Characteristics
Input frequency Input level Permitted range (Reference value of 1kHz)
20 Hz +4 dBu
20 kHz +4 dBu
t LINE Noise Level
Permitted range
–82 dBu or below
y MIC Gain
Parameters: Set the INPUT GAIN VR to MAX [MIC].
Input frequency Input level Specified output level Permitted range
1 kHz –46 dBu
u MIC Distortion
Parameters: Set the INPUT GAIN VR to MAX [MIC].
Input frequency Input level Permitted range (distortion ratio)
1 kHz –46 dBu
i MIC Noise Level
Parameters: Set the INPUT GAINVR to MAX [MIC].
Permitted range
–55 dBu or below
2-2-2.INPUT 2 (BAL XLR)
Parameters: Measure with INPUT 2 → STEREO R.
Measurement items and specified values are the same as
INPUT 1.
2-2-3.INPUT 3 (BAL XLR)
Parameters: Measure with INPUT 3 → MONITOR L.
Set the MONITOR VR to MAX.
Measurement items and specified values are the same as
INPUT 1.
+4 dBu +4±2 dBu
1 % or below
0.05 % or below
–3~+1 dB
–3~+1 dB
+4 dBu +4±3 dBu
0.2 % or below