Yamaha i88x Service Manual page 51

T01: FS, Jitter, mLAN ACTIVE LED, mLAN Terminal Check
[Description]
• Checks that the FS on the main unit switches over
correctly by changing the FS on the mLAN side.
• Checks that the mLAN Active LED function
normally.
• Checks that the mLAN terminals (x2) function
normally.
[Equipment Setting]
Inspection tool:
Main Unit Settings:
PHANTOM SW OFF
Input 1
Input 2
Inputs 3 - 8
Monitor Select
Optical Select
Monitor Volume max
Master Volume
[Procedure]
1-1 Apply an input signal(-60dBu) to Input 1 and Input
2.
Switch over the FS by using the Inspection
tool.(Click LoopBack "C"[48KHz] or LoopBack
"D"[96KHz])
1-2 Turn off/on the mLAN ACTIVE LED by using the
Inspection tool.("LED lighting" button is clicked
and "START" button is clicked on the following
screen.)
1-3 Make sure that the terminal mLAN connection is
changed.
[Check Item]
1-1 Press and hold down the [MOMITOR SELECT]
switch, make sure that the FS is as it set.
In each FS setting, confirm that an output sig-
nal(+4+/-2dBu)(10K ohm load) exists from the
OUTPUT 1.
Make sure of a jitter at the OPTICAL OUT, refer-
ring to the NOTES) in the [Miscellaneous] item
below.
Also, confirm that both the mLAN ACTIVE and
CLOCK MASTER(mLAN) LEDs light up.
1-2 Make sure that the mLAN LED is turned off/on.
1-3 Make sure that both mLAN ports function correctly.
[Miscellaneous]
NOTES
a) When changing the FS from the Inspection tools, a
jitter fluctuates for a while.
Therefore, after waiting for the stable jitter value,
begin the measurement.
b) Jitter is measured for ten seconds, and if the MAX
value is 10ns or less, it accepts. However, if it is
20nS or less even in case of it is time when momen-
tarily exceeded 10nS from once every 10 seconds, it
accepts.
LoopBackOn, FS=48KHz/96KHz,
Connection Setting(Master=PC)
MIC (Gain Volume max)
MIC (Gain Volume max)
(Gain Volume max)
OFF
DIGITAL
max
T02: MIDI IN/OUT Check
[Description]
Checks that the test MIDI data sent to the MIDI IN
jack is output from the MIDI OUT jack.
[Equipment Setting]
Inspection tool:
Main Unit Setting:
PHANTOM SW OFF
Input 1
Input 2
Inputs 3 - 8
Monitor Select
Optical Select
Monitor Volume max
Master Volume
O1V96(or MIDI Monitor) connection
[Procedure]
2-1 Interconnect the MIDI OUT/IN on the 01V96 and
the MIDI IN/OUT jacks on the main unit via two
MIDI cables.
Press the [USER DEFINE KEY[2]] on the 01V96.
[Check Item]
2-1 Confirm that the [MASTER] fader on the 01V96
moves up and down correctly every time the [USER
DEFINE KEY[2]] is pressed.
∗ If the thing that the MIDI signal returns can be
confirmed, it accepts.
T03: OPTICAL IN/OUT Check
[Description]
Checks that the digital data sent to the OPTICAL IN
jack is output from the OPTICAL OUT jack.
[Equipment Setting]
Inspection tool:
Main Unit Setting:
PHANTOM SW OFF
Input 1
Input 2
Inputs 3 - 8
Monitor Select
Optical Select
Monitor Volume max
Master Volume
[Procedure]
3-1 Connect an Optical Output Device to the OPTICAL
IN jack on the main unit.
Connect an Optical Input Device to the OPTICAL
OUT jack on the main unit.
Play back the music data from the Optical Output
Device.
LoopBackOn, FS=96KHz,
Connection Setting(Master=PC)
MIC (Gain Volume max)
MIC (Gain Volume max)
(Gain Volume max)
OFF
DIGITAL
max
LoopBackOn, FS=96KHz,
Connection Setting(Master=PC)
MIC (Gain Volume max)
MIC (Gain Volume max)
(Gain Volume max)
DIGITAL
DIGITAL
max
i88X
51