Yamaha M7CL-32 Service Manual page 119

(7) Maximum output (OMNI OUT 1—16)
Parameters: Assign only the built-in oscillator to OMNI OUT
1—16.
Input Frequency Output Level Permissible Range
1 kHz +24 dBu +24±0.5 dBu
2-2. PHONES L, R
Parameters: Input from INPUT (XLR) of CH1.
Assign CH1 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
(2) f characteristics (PHONES L, R)
Parameters: 1 kHz is used as the reference of the permissible range.
Input Frequency Input Level
20 Hz 0 dBu
20 kHz 0 dBu
(3) Distortion factor (PHONES L, R)
Input Frequency Output Level
1 kHz 0 dBu 0.15 % or below
(4) Residual noise (PHONES L, R)
Parameters: Turn off STEREO.
PHONES LEVEL Permissible Range
MAX –79 dBu or below
MIN –86 dBu or below
(5) PHONES L to R level difference
Adjust the range of difference in the gain measured in item (1)
above as follows.
Permissible Range
Within 2 dB
(6) 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
1 kHz +3 dBu
(7) L to R crosstalk
Parameters: Set PAN fully to the L side.
Input Frequency Output Level (L) Permissible Range (R)
1 kHz +3 dBu –56 dBu or below
Perform the same check on the R side.
2-3. CH IN 1— 48, ST IN 1— 4 (L, R)
Parameters: Use OMNI OUT 15 (L) of CH IN 1— 48 for this
inspection.
For ST IN 1— 4 (L, R) inspection, use OMNI OUT
15 (L) for L channel measurement and OMNI OUT
16 (R) for R channel measurement.
Assign the INPUT PORT of the ST IN 1L to the ST
IN 1L module and INPUT PORT of the ST IN 1R to
Permissible Range (Distortion Factor)
0.01 % or below
0 dBu 0±2 dBu
Permissible Range
–3 — 0.5 dB
–3 — 0.5 dB
Permissible Range
Permissible Range (Distortion Factor)
+3±0.5 dBu 0.15 % or below
the ST IN 1R module. Assign respective INPUT
PORTs to the ST IN 2— 4 (L, R) modules as well.
A. GAIN –62 dB
(1) Gain (CH IN 1— 48, ST IN 1— 4 (L, R))
Input Frequency Input Level Prescribed Output Level Permissible Range
1 kHz –62 dBu
(2) f characteristics (CH IN 1— 48, ST IN 1— 4 (L, R))
Parameters: 1 kHz is used as the reference of the permissible range.
Input Frequency Input Level
20 Hz –62 dBu
20 kHz –62 dBu
(3) Distortion factor (CH IN 1—48, ST IN 1—4 (L, R))
Input Frequency Output Level
1 kHz +22 dBu 0.02 % or below
(4) Noise level EIN (CH IN 1— 48, ST IN 1— 4 (L, R))
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,
check for:
Measured value – (gain at 1 kHz) –128
(5) Level difference (CH IN 1— 48, ST IN 1— 4 (L, R))
Adjust the range of difference in the gain measured in item (1)
above as follows.
Permissible Range
Within 2 dB
B. GAIN +10 dB
(1) Gain (CH IN 1— 48, ST IN 1— 4 (L, R))
Input Frequency Input Level Prescribed Output Level Permissible Range
1 kHz +10 dBu
(2) Distortion factor (CH IN 1— 48, ST IN 1— 4 (L, R))
Input Frequency Output Level
1 kHz +22 dBu 0.01 % or below
(3) Noise level (CH IN 1— 48, ST IN 1— 4 (L, R))
Parameters: Short CH IN, ST IN to be measured with 150 Ω.
Permissible Range
–80 dBu or below
C. Phantom voltage (CH IN 1— 48, ST IN 1— 4 (L, R))
With No.2 and No.3 pins of XLR shorted and 10 kΩ load
connected between No.2 and No.1 pins, adjust the voltage when
the +48 key is turned on as follows.
Permissible Range
DC33 — 37 V
Also, check that discharging starts immediately when the +48
key is turned off.
2-4. TALKBACK
Parameters: Use OMNI OUT 15 (L).
Assign the talkback to STEREO ST L.
Set talkback to ON
M7CL-32/M7CL-48
+4 dBu +4±2 dBu
Permissible Range
–1.5 — 0.5 dB
–1.5 — 0.5 dB
Permissible Range
< =
+4 dBu +4±2 dBu
Permissible Range
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