Yamaha DM 1000, Руководство по обслуживанию

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105
DM1000/MB1000/SP1000
e
Distortion ratio (CH 1~16)
r
Noise level (CH 1~16)
Parameter Short the CH IN being measured with
150
Ω
.
However, if the permitted range above is not met, EIN
Measurement value (Gain at 1 kHz) must be -128.
t
Level difference (CH 1~16)
The range of difference in the gain measured with
q
is regulated as follows.
B. GAIN MIN, PAD ON
q
Gain (CH 1~16)
w
Distortion ratio (CH 1~16)
e
Noise level (CH 1~16)
Parameter Short the CH IN being measured with
150
Ω
.
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
.
The even channels must be the same.
C. Phantoms (CH 1~16)
Short XLR Pin 2 and Pin 3, connect a 10 k
Ω
load
between Pin 2-1, then switch the Phantom switch
On. The voltage is regulated to be no more than the
following.
Check that when the Phantom switch is switched
Off, the discharge starts quickly.
Input frequency Output level Permissible range
1kHz +22dBu 0.02% or below
Permissible range
-64dBu or below
Permissible range
Within 2dB
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
Out
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)
w
Residual noise (OMNI OUT 1~16)
Parameter Switch BUS OUT Off.
3-2. PHONES OUT L/R
Parameters Must be input from Channel 1.
PHONES LEVEL MAX.
q
Distortion ratio (both L/R)
w
Residual noise (both L/R)
Parameter PHONES LEVEL MIN.
Input frequency Input level Regulated output level Permissible range
1kHz +4dBu +4dBu +4
±
2dBu
Input frequency Output level Permissible range
1kHz +22dBu 0.01% or below
Permissible range
-82dBu or below
Input frequency Output level (odd channels) Permitted range (even channels)
1kHz +22dBu -58dBu or below
Permissible range
DC 31~37V
LED level Input frequency Input level
Reference output level
(OMNI OUT 1)
PEAK 1kHz +23dBu +23dBu
SIGNAL 1kHz -14dBu -14dBu
LED level Input frequency Input level
Reference output level
(OMNI OUT 1)
PEAK 1kHz +19dBu +19dBu
SIGNAL 1kHz -18dBu -18dBu
Input frequency Output level Permissible range
1kHz +22dBu 0.01% or below
Permissible range
-86dBu or below
Input frequency Output level Permissible range
1kHz -10dBu 0.04% or below
Permissible range
-110dBu or below