Yamaha IM8-32, Service Manual

Page: 108 / 307

IM8-40/IM8-32/IM8-24
108
Table 2-2-12 ST, GROUP1–8, MONO, AUX INSERT INPUT [dBu]
INPUT
INPUT
level
ST OUT L ST OUT R GROUP1–4 OUT MONO OUT AUX OUT1–8
ST INSERT L INPUT
-10
+4 ± 2 – – – –
ST INSERT R INPUT – +4 ± 2 – – –
GROUP1–8 INSERT INPUT – – +4 ± 2 – –
MONO INSERT INPUT – – – +4 ± 2 –
AUX1–8 INSERT INPUT – – – – +4 ± 2
* Check that the difference in the level between L and R of the ST is 2 dB or less.
In the state described in section 2-1, input signals to the MONO INPUT CH1 and after turning on respective ASSIGN switches or
setting SEND control to the MAX, set only one of the assigned MATRIX MIX controls. Check that the output level is as shown
in the Table 2-2-13.
Table 2-2-13 MATRIX OUT1–4 [dBu]
INPUT
INPUT
level
GAIN PAD
MATRIX
OUT1–4 MONITOR
OUT L, R
CH1 A -80 MAX OFF
+10.0 ± 2
(#, $)
+16.0 ± 2
* Turn on the MATRIX AFL switch.
* The difference in the level between input channel should be 2 dB or less.
* No signal shall be output when the MATRIX level control is set to minimum.
* To check the ST or Group, take measurements with the PAN fully turned to L or R.
2-3 Frequency Characteristics
In the signal routes of the Table 2-2-1 to 2-2-12 indicated with (#), check the 20 Hz and 20 kHz frequency response of each out-
put is within the range of +1/-2.5 dB compared with the 1 kHz (0 dB). In case of the signal routes indicated with (##) [TB MIC
IN], apply 163 Hz instead of 20 Hz and check that the frequency response is within the range of -3± 2 dB.
* The 20 Hz level when the GAIN control is at MAX shall be within the range of +1.0/-4.5 dB.
* The 20 Hz level at PHONES shall be within the range of +0/-5.5 dB when the GAIN control is at MAX (+0/-3.5 dB when the
GAIN control is at MIN).
* In the signal routes of the Table 2-2-1 to 2-2-2, check every OUT when the signal is fed to the CH 1 and check only the ST L
OUT when the signal is fed to the CH 2 or other channels.
2-4
80
(HPF)
In the state of the Table 2-2-1, feed 80 Hz input signal with input level of -36 dBu and the GAIN set to MIN and check that the
STEREO L OUT output level when the
80
switch is set to ON is within the range of -3 ± 2 dB compared to the level obtained
when the switch is set to OFF.
2-5 COMP
2-5-1 Gain and COMP LED Off check
In the state described in section 2-2, check that the output level of each INSERT OUT when the COMP control of the CH INPUT
is set at MAX is within the range shown in the Table 2-5-1.
Table 2-5-1 [dBu]
CH INPUT INPUT level COMP control INSERT OUT
MIC -65 MAX +3.0 ± 2