Yamaha IM8-32 Service Manual page 109

2-5-2 Ratio and COMP LED lighting check
Check that the output level at each INSERT OUT is within the range shown in the Table 2-5-2 compared with the output level in
the Table 2-5-1 when the input level is raised by 10 dB.
Check also that the COMP LED is lit then.
Table 2-5-2 [dBu]
CH INPUT INPUT level [dB]
MIC
2-5-3 Frequency Characteristics
In the state of the Table 2-5-2, check that the output level at the INSERT OUT is within the range of ±3 dB compared with the
output at 1 kHz when the signal frequency is set to 20 Hz and 20 kHz.
2-5-4 Distortion
In the state of the Table 2-5-2, check that the distortion when the signal frequency is set to 20 Hz, 1 kHz, and 20 kHz is equal to
or less than the values in the Table 2-5-4.
Table 2-5-4 [%]
INPUT Frequency Distortion
20 Hz
1 kHz
20 kHz
2-5-5 Attack/Release Time
In the state of the Table 2-5-2, the output attack time at the INSERT OUT [restoration time until 90% when the input is changed
from -65 dBu to -55 dBu] and the release time [restoration time until 90% when the input is changed from -55 dBu to -65 dBu]
shall be within the range shown in the Table 2-5-5.
ATTACK TIME
Table 2-5-5 [ms]
ST OUT L
ATTACK TIME
RELEASE TIME 150 – 420
INSERT OUT
-55 +3.5 ± 1
5.0
1.0
1.5
90%
Restoration Time
15 – 35
RELEASE TIME
100%
IM8-40/IM8-32/IM8-24
90%
Restoration Time
100%
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