Yamaha DM 1000, Service Manual

Page: 103 / 307

103
DM1000/MB1000/SP1000
INSPECTIONS
Perform the Check of DM1000.
1. Preparations
1-1. Parameters
The parameters are as follows unless otherwise
specified.
Set WORD CLOCK INT to 96 kHz.
Only the channel being measured is ON.
PAN: Center
GAIN : MIN
PAD : ON
FADER : NOMINAL (0 dB)
0 dBu = 0.775Vrms
0 dBV = 1Vrms=2.2 dBu
0 dBFS = 0 dB full scale
The oscillator output impedance is 150
Ω
.
The oscilloscope, level meter, etc. input impedance
must be at least 100k
Ω
.
Noise measurement is corrected with a 12.7 kHz
-6 dB/octave low pass filter.
(These are not effective values, but measurement
with average values.)
Distortion measurement is corrected with an 80
kHz, -6 dB/octave low pass filter.
For analog output inspection, the following
parameters are added or changed.
For maximum output measurement, unless
otherwise specified, output 0 dB from the internal
oscillator.
The analog output loads are set to
OMNI OUT: 600
Ω
PHONES: 8
Ω
1-2. Writing Programs
If the main program or the boot program is not the
latest version upgrade to the latest version.
The method for checking the program version is
in “7-1. Method for Checking the Program Version”
and the method for checking the program version
is in “7-2. Method for Writing the Program”.
For the latest program, please download from
the YSISS home page.
1-3. Initialization
Before inspection, calibrate the faders and initialize
the main unit. The initialization method is in “7-3.
Method for Initialization with Fader Calibration”.
1-4. Fader Inspection
q
Preparations
a. Press the LAYER [MASTER] key to select the
master layer.
b. Move all the faders all the way up.
c. Press the DISPLAY ACCESS [PAIR/GROUP] key
a few times, switch to the OUTPUT FADER
GROUP screen, and press the [SEL 1]~[SEL 16]
and [SEL STEREO] keys and group the 17 faders.
w
Group inspection
a. Operate the stereo master fader, repeat the delay
(about 3 seconds/100 mm) twice and repeat the
advance (about 1 second/100 mm) twice.
b. Operate the Channel 1 fader, repeat the delay
(about 3 seconds/100 mm) twice and repeat the
advance (about 1 second/100 mm) twice.
c. Check that there are no vibrating faders or
extremely late faders in the above operations
e
Recall inspection
a. Press the LAYER [1-16] key and select Layers 1-16.
b. Press the DISPLAY ACCESS [SCENE] key to
switch to the SCENE MEMORY screen, then press
the SCENE MEMORY [
] key or [ ] key to select
0, then press the [RECALL] key to recall 0.
c. Move all the faders all the way up, press the
SCENE MEMORY [ ] key or [ ] key to select 1,
then press the [STORE] key and when the TITLE
EDIT screen is displayed, select OK to store 1.
d. With the operation method in b., repeat two times
from the 0 recall to the 1 recall.
e. Check that there are no vibrating faders or
extremely late faders in the above operations.
2. ANALOG IN/OUT WORD CLOCK INT
96 kHz inspection
2-1. OMNI OUT 1~12
Parameters Must be input from Channel 1.
CH1 ROUTING BUS 1 ON.
With OUTPUT PATCH, BUS 1CH
assigned to OMNI 1~12CH.
BUS1 MASTER FADER ON.
q
Gain (OMNI OUT 1~12)
w
f characteristic (OMNI OUT 1~12)
Parameter The permitted range uses 1 kHz as
reference.
Input frequency Input level Regulated output level Permissible range
1kHz +4dBu +4dBu +4
±
2dBu
Input frequency Input level Permissible range
20Hz +4dBu -1.5~+0.5dB
40kHz +4dBu -1.5~+0.5dB