Yamaha IM8-32, Service Manual

Page: 110 / 307

IM8-40/IM8-32/IM8-24
110
2-5-6 COMP LED Off check
In the state of 2-5-1, check that the COMP LED is not lit when the input signal is changed to -68 dBu.
2-6 Channel Equalizer Characteristics
In the state described in section 2-1, check that the output level obtained at the GROUP 1 OUT in the case of the CH
INPUT and ST CH INPUT L and at the GROUP 2 OUT in the case of the ST CH INPUT R in each frequency when LOW,
LO-MID, HI-MID and HIGH of INPUT are moved respectively with the EQ switch turned on is within the range shown
in the Table 2-6-1 to 2-6-2 compared with the output level when the EQ controls are at the center click position. If the out-
put level is without the range when the specifi ed frequency is applied, change the frequency within the range of ± 20％
of the specifi ed frequency and check that the variation width is within the range shown in the Table 2-6-1 to 2-6-2.
Table 2-6-1 IM8-40: CH1–40, IM8-32: CH1–32, IM8-24: CH1–24 [dBu]
EQ VR f VR Applied frequency Variation width
HIGH
MAX –
10 kHz
+12 ± 2
MIN – -12 ± 2
HI-MID
MAX
MAX 8 kHz
+15 ± 2.5
MIN -15 ± 2.5
MAX
MIN 400 Hz
+15 ± 2.5
MIN -15 ± 2.5
LO-MID
MAX
MAX 1.6 kHz
+15 ± 2.5
MIN -15 ± 2.5
MAX
MIN 80 Hz
+15 ± 2.5
MIN -15 ± 2.5
LOW
MAX –
100 Hz
+12 ± 2
MIN – -12 ± 2
Table 2-6-2 ST CH1–4 [dB]
EQ VR Applied frequency Variation width
HIGH
MAX
10 kHz
+12 ± 2
MIN -12 ± 2
HI-MID
MAX
3 kHz
+15 ± 2.5
MIN -15 ± 2.5
LO-MID
MAX
800 Hz
+15 ± 2.5
MIN -15 ± 2.5
LOW
MAX
100 Hz
+12 ± 2
MIN -12 ± 2
2-7 Crosstalk
Set the GROUP 1 – 8, ST and MONO master fader to MAX. At the CH 1, set the fader to MAX and turn on the ON switch.
Turn on the 1 – 2 ASSIGN switch of the CH 1, fully turn the PAN control counterclockwise (L/ODD) and check that the level of
the leakage to the GROUP 2 OUT is -50 dBu or less when the signal of +20 dBu is outputted to the GROUP 1 OUT. Then, check
that the level of the leakage to the GROUP 1 OUT is -50 dBu or less when the signal of +20 dBu is outputted to the GROUP 2
OUT with the PAN control turned fully clockwise (R/EVEN). The same can be said of between the GROUP 3 – 4, 5 – 6, 7 – 8
and ST L – R.