Yamaha AD824, Service Manual

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(5) Noise level EIN
Conditions: CH IN 1 to 8 channels shorted using 150 ohms.
However, if it does not enter within the permissible range shown above, the measured value shall be (gain per 1 kHz)
≤
-128.
(6) Difference between channels
Specify so that it will be less than the difference in the gain range measured at (1).
(7) Cross talk between odd channels and even channels
Conditions: Input signal into odd channels.
Even channels shorted using 150 ohms.
Even channels are also the same.
(8) Phantom
Short XLR pin 2 and pin 3, connect a 10 kohms load between pins 2 and 1 and measure the voltage as shown below when the
+48V master switch is turned on.
Check that discharge starts quickly when the +48V master switch is turned off and when the [+48] key is set to off.
2-2 INSERT IN1 to 8CH
(1) Maximum input
2-3 INSERT OUT1 to 8CH
Conditions: The load for AD824 insert out 1 to 8 channels is 10 kohms.
(1) Maximum input
2-4 Operation confirmation of level meters 1 to 8
Conditions: Input specified level to AD824 input 1 to 8.
AD824 can also have simultaneous input of channels 1 to 8
Visually confirm the on and off of the peak, nominal and signal LEDs.
(1) On (Lit)
(2) Off (Not lit)
2-5 Jitter measurement
(1) INTERNAL 44.1 kHz, 48 kHz
· Insert MY8-AE card into the slot and connect to DSA1 via the D-sub-cannon converter box.
· Set AD824 word clock settings to 44.1 kHz and 48 kHz.
AD824
37
LED level Input frequency Input level Reference output level (DA824)
PEAK
NOMINAL
SIGNAL
1 kHz
1 kHz
1 kHz
+23 dBu
+12 dBu
-8 dBu
+17 dBu
+6 dBu
-14 dBu
LED level Input frequency Input level Reference output level (DA824)
PEAK
NOMINAL
SIGNAL
1 kHz
1 kHz
1 kHz
+18 dBu
+8 dBu
-12 dBu
+12 dBu
+2 dBu
-18 dBu
GAIN Permissible range
-62 dB Less than -62 dBu
WORD CLOCK Permissible range
44.1 kHz
48 kHz
Less than 5 nsec
Less than 5 nsec
Permissible range
Within 1 dB
Permissible range
DC34 to 38V
Input frequency Output level (Odd CH) Permissible range (Even CH)
1 kHz +16 dBu Less than -54 dBu
Input frequency Input level Specified output level (DA824) Permissible range
1 kHz +24 dB
+18 dBu 18 +/-1 dBu
Input frequency Input level Specified output level (AD824) Permissible range
1 kHz +24 dB
+24 dBu 24 +/-1 dBu