Yamaha DM1000 Service Manual page 105

e Distortion ratio (CH 1~16)
Input frequency Output level
1kHz +22dBu
r Noise level (CH 1~16)
Parameter Short the CH IN being measured with
150 Ω.
Permissible range
-64dBu or below
However, if the permitted range above is not met, EIN
Measurement value (Gain at 1 kHz) must be
t Level difference (CH 1~16)
The range of difference in the gain measured with
q is regulated as follows.
Permissible range
Within 2dB
B. GAIN MIN, PAD ON
q Gain (CH 1~16)
Input frequency Input level Regulated output level Permissible range
1kHz +4dBu
w Distortion ratio (CH 1~16)
Input frequency Output level
1kHz +22dBu
e Noise level (CH 1~16)
Parameter Short the CH IN being measured with
150 Ω.
Permissible range
-82dBu or below
r Crosstalk between odd channels and even channels
Parameters Input a signal on the odd side channels.
Short the even side channels with 150 Ω.
Input frequency Output level (odd channels) Permitted range (even channels)
1kHz +22dBu
The even channels must be the same.
C. Phantoms (CH 1~16)
Short XLR Pin 2 and Pin 3, connect a 10 kΩ load
between Pin 2-1, then switch the Phantom switch
On. The voltage is regulated to be no more than the
following.
Permissible range
DC 31~37V
Check that when the Phantom switch is switched
Off, the discharge starts quickly.
Permissible range
0.02% or below
-128.
+4dBu +4±2dBu
Permissible range
0.01% or below
-58dBu or below
2-5. CH IN 1~16 level meter operation check
Parameters Input the regulated level to the
channels being measured.
1~16 CH can be input at the same time.
Check visually that the PEAK and
SIGNAL LED lights up and goes out.
Lit up
LED level Input frequency
PEAK 1kHz
SIGNAL 1kHz
Out
LED level Input frequency
PEAK 1kHz
SIGNAL 1kHz
2-6. TALKBACK
Parameters Inspect with OMNI OUT 1.
Assign OMNI 1 with the MONITOR
TALKBACK screen.
TALKBACK LEVEL MAX.
TALKBACK SW ON.
Check that signals from the mic appear.
3. ANALOG IN/OUT WORD CLOCK INT
48 kHz inspection
3-1. OMNI OUT 1~12
Parameters Must be input from Channel 1.
CH1 ROUTING BUS 1 ON.
With OUTPUT PATCH, BUS 1CH
assigned to OMNI 1~16CH.
BUS1 MASTER FADER ON.
q Distortion ratio (OMNI OUT 1~16)
Input frequency Output level
1kHz +22dBu
w Residual noise (OMNI OUT 1~16)
Parameter Switch BUS OUT Off.
Permissible range
-86dBu or below
3-2. PHONES OUT L/R
Parameters Must be input from Channel 1.
PHONES LEVEL MAX.
q Distortion ratio (both L/R)
Input frequency Output level
1kHz -10dBu
w Residual noise (both L/R)
Parameter PHONES LEVEL MIN.
Permissible range
-110dBu or below
DM1000/MB1000/SP1000
Reference output level
Input level
(OMNI OUT 1)
+23dBu +23dBu
-14dBu -14dBu
Reference output level
Input level
(OMNI OUT 1)
+19dBu +19dBu
-18dBu -18dBu
Permissible range
0.01% or below
Permissible range
0.04% or below
105