Yamaha i88x Service Manual - page 54
i88X
54
make sure that the output signal level stays in the
range of +/-1dB against the standard level at 1KHz.
Also change the frequency to 20KHz, make sure of
the same level as above.
Make sure that the signal level of OUTPUT 8 is -
70dBu or less.
6-10Make sure that the signal(+4+/-3dBu, 10K ohm
load) is output from the OUTPUT 8 jack.
Also confirm that the distortion rate is 0.01% or less
at that time.
Change the frequency of input signal to 20Hz and
make sure that the output signal level stays in the
range of +/-1dB against the standard level at 1KHz.
Also change the frequency to 20KHz, make sure of
the same level as above.
Make sure that the signal level of OUTPUT 7 is -
70dBu or less.
6-11Disconnect the mLAN cable and select 1/2 CH
using the [MONITOR SELECT] switch.
At that time, confirm that the volume level varies
smoothly while turning the [GAIN CH1] knob from/
to minimum to/from maximum position.
Make sure that the volume level varies smoothly
while turning the [MASTER VOLUME] knob from/
to minimum to/from maximum position.
Also, make sure that the volume level varies
smoothly while turning the [MONITOR VOLUME]
knob from/to minimum to/from maximum position.
As for each volume knob described above, at the
maximum volume level, confirm that the signal
(+4+/-2dBu, 10K ohm load) is output from the
OUTPUT 1 jack respectively.
Make sure that the CLOCK MASTER(mLAN) LED
blinks in order to indicate the UNLOCK.
Make sure that the CLOCK MASTER (INT) LED
lights up.
Make sure that the MONITOR SELECT 1/2 LED
lights up.
6-12Disconnect the mLAN cable and select 1/2 CH
using the [MONITOR SELECT] switch.
At that time, confirm that the volume level varies
smoothly while turning the [GAIN CH2] knob from/
to minimum to/from maximum position.
Make sure that the volume level varies smoothly
while turning the [MASTER VOLUME] knob from/
to minimum to/from maximum position.
Also, make sure that the volume level varies
smoothly while turning the [MONITOR VOLUME]
knob from/to minimum to/from maximum position.
As for each volume knob described above, at the
maximum volume level, confirm that the signal
(+4+/-2dBu, 10K ohm load) is output from the
OUTPUT 2 jack respectively.
Make sure that the CLOCK MASTER(mLAN) LED
blinks in order to indicate the UNLOCK.
Make sure that the CLOCK MASTER (INT) LED
lights up.
Make sure that the MONITOR SELECT 1/2 LED
lights up.
6-13Make sure that the signal(+4+/-3dBu, 10K ohm
load) is output from the OUTPUT 3 jack.
Make sure that the volume level varies smoothly
while turning the [GAIN CH3] knob from/to
minimum to/from maximum position.
Select 3/4 CH using the [MONITOR SELECT]
switch and confirm that the signal is output from the
OUTPUT 1 jack.
Make sure that the MONITOR SELECT 3/4 LED
lights up.
6-14Make sure that the signal(+4+/-3dBu, 10K ohm
load) is output from the OUTPUT 4 jack.
Make sure that the volume level varies smoothly
while turning the [GAIN CH4] knob from/to
minimum to/from maximum position.
Select 3/4 CH using the [MONITOR SELECT]
switch and confirm that the signal is output from the
OUTPUT 2 jack.
Make sure that the MONITOR SELECT 3/4 LED
lights up.
6-15Make sure that the signal(+4+/-3dBu, 10K ohm
load) is output from the OUTPUT 5 jack.
Make sure that the volume level varies smoothly
while turning the [GAIN CH5/6] knob from/to
minimum to/from maximum position.
Select 5/6 CH using the [MONITOR SELECT]
switch and confirm that the signal is output from the
OUTPUT 1 jack.
Make sure that the MONITOR SELECT 5/6 LED
lights up.
6-16Make sure that the signal(+4+/-3dBu, 10K ohm
load) is output from the OUTPUT 6 jack.
Make sure that the volume level varies smoothly
while turning the [GAIN CH5/6] knob from/to
minimum to/from maximum position.
Select 5/6 CH using the [MONITOR SELECT]
switch and confirm that the signal is output from the
OUTPUT 2 jack.
Make sure that the MONITOR SELECT 5/6 LED
lights up.
6-17Make sure that the signal(+4+/-3dBu, 10K ohm
load) is output from the OUTPUT 7 jack.
Make sure that the volume level varies smoothly
while turning the [GAIN CH7/8] knob from/to
minimum to/from maximum position.
Select 7/8 CH using the [MONITOR SELECT]
switch and confirm that the signal is output from the
OUTPUT 1 jack.
Make sure that the MONITOR SELECT 7/8 LED
lights up.
6-18Make sure that the signal(+4+/-3dBu, 10K ohm
load) is output from the OUTPUT 8 jack.
Make sure that the volume level varies smoothly
while turning the [GAIN CH7/8] knob from/to
minimum to/from maximum position.
Select 7/8 CH using the [MONITOR SELECT]
switch and confirm that the signal is output from the