Yamaha CL3, Service Manual

Page: 123 / 401

CL3/CL1
123
6
Crosstalk between adjacent channels
Parameters: Turn on OMNI OUT of only one odd number
channel for output, turn off OMNI OUT of other
channels and measure the noise level of even
number channels next to the odd number channel
on both sides.
Short INPUT of the even number channels to be
measured with 150
Ω .
Input Frequency
Output Level (Odd
Channel)
Permissible Range
(Even Channel)
1 kHz +23 dBu –57 dBu or below
Perform the same check on the even number channels.
7
Maximum output (OMNI OUT 1-8)
Parameters: Assign only the built-in oscillator to OMNI OUT
1-8.
Input
Frequency
Output Level
Permissible
Range
Permissible Range
(Distortion)
1 kHz +24 dBu +24±0.5 dBu 0.01 % or below
B. GAIN MAX
1
Gain (OMNI IN 1-8)
Input
Frequency
Input Level
Prescribed
Output Level
Permissible
Range
1 kHz –62 dBu +4 dBu +4±2 dBu
2
Distortion (OMNI IN 1-8)
Input
Frequency
Output Level
Permissible
Range
1 kHz +22 dBu 0.02 % or below
3
Noise level EIN (OMNI IN 1-8)
Parameters: Short CH IN to be measured with 150 Ω .
Permissible Range
–62 dBu or below
If the measured value is out of the above permissible
range,con
fi rm that “measured value – (Gain at 1kHz)
≦
-128”
is obtained.
4
Level difference (OMNI IN 1-8)
Con fi rm that the range of difference in the gain measured in
item 1 above is as follows.
Permissible Range
Within 2 dB
C. PHANTOM VOLTAGE (OMNI IN 1)
With No.2 and No.3 pins of XLR shorted and 10 k Ω load
connected between No.2 and No.1 pins, check that the voltage
is as follows when the +48 key is turned on.
Permissible Range
DC 33.6 – 36.1 V
Also, check that discharging starts immediately when the +48
key is turned off.
2-2. PHONES L, R
Parameters: Input from INPUT (XLR) of OMNI IN 1.
Assign OMNI IN 1 to STEREO.
Set MONITOR SOURCE to STEREO l/R.
Set PHONES LEVEL LINK to OFF.
1
Gain (PHONES L, R)
Input
Frequency
Input Level
Prescribed
Output Level
Permissible
Range
1 kHz 0 dBu 0 dBu 0±2 dBu
2
Distortion (PHONES L, R)
Input
Frequency
Output Level
Permissible
Range
1 kHz 0 dBu 0.15 or below
3
Residual noise (PHONES L, R)
Parameters: Turn off STEREO.
PHONES Level Parameter Range
MAX –79 dBu or below
MIN –88 dBu or below
4
PHONES L to R level difference
Con fi rm that the range of difference in the gain measured in
item 1 above is as follows.
Permissible Range
Within 2 dB
5
Maximum output (PHONES L, R)
Parameters: Assign only the built-in oscillator to STEREO and
output -27 dB from the built-in oscillator.
Input
Frequency
Output Level
Permissible
Range
Permissible range
(Distortion)
1 kHz +3 dBu +3±0.5 dBu 0.15 % or below
6
L to R crosstalk
Parameters: Set PAN fully to the L side.
Input
Frequency
Output Level
Permissible
Range
1 kHz +3 dBu –56 dBu or blow
Perform the same check on the R side.
2-3. TALKBACK
Parameters: Use OMNI OUT 1 for the inspection.
Assign TALKBACK to MIX1.
Turn TALKBACK to ON.
A. GAIN MAX
1
Gain
Input
Frequency
Input Level
Prescribed
Output Level
Permissible
Range
1 kHz –60 dBu +4 dBu +4±2 dBu