Yamaha i88x Service Manual page 56

i88X
T10: ATSC2 CLOCK Check
[Description]
System Clock is extracted from ADAT I/F.
[Equipment Setting]
Inspection tool:
Main Unit Setting:
PHANTOM SW
Input 1
Input 2
Inputs 3 - 8
Monitor Select
Optical Select
Monitor Volume
Master Volume
O1V96:
(ClockMaster =Internal 48KHz, Coaxial/ADAT
connection)
[Procedure]
10-1Interconnect the ADAT IN/OUT terminals on the
01V96 and the OPTICAL OUT/IN terminals on the
main unit.
Input the signal(-34 dBu) to the INPUT 1.
10-2Disconnect the OPTICAL cable used for ADAT
connection.
[Check Item]
10-1Make sure that the signal(+4+/-2dBu, 10K ohm
load) is output from the OUTPUT 1 correctly.
Also confirm that the CLOCK MASTER(ADAT)
LED lights up.
10-2Make sure that the signal(+4+/-2dBu, 10K ohm
load) is output from the OUTPUT 1.
Also confirm that the CLOCK
MASTER(INTERNAL) LED lights up.
T11: Factory Set
[Description]
Checks the click noise which occurs when turning
the power on/off.
Checks the level of noise which occurs soon after
turning the power on.
Checks the consumption current for the secondary
side of AC adaptor.
[Equipment Setting]
Main Unit Setting:
PHANTOM SW
Input 1
Input 2
Inputs 3 - 8
Monitor Select
Optical Select
Monitor Volume
Master Volume
56
LoopBack Off, FS=48KHz,
Connection Setting(Set to
"Master=i88x" first, and then
disconnect the mLAN cable.)
OFF
LINE (Gain Volume max)
LINE (Gain Volume max)
(Gain Volume max)
1/2 CH
ADAT NORMAL
max
max
Connection
OFF
LINE (Gain Volume min)
LINE (Gain Volume min)
(Gain Volume min)
OFF
DIGITAL
min
max
[Procedure]
11-1As for the main unit, turn the power on or
off(STANBY).
11-2As for the main unit, turn the power on.
11-3Measure the consumption current over 1 minute
after turning on the power of the main unit.
[Check Item]
11-1Confirm that the click noise level at each jack meets
the following conditions.
OUTPUT 1, 2 500mVpp or less
OUTPUTs 3 - 8 500mVp-p or less
PHONES L,R 500mVp-p or less
11-2Confirm that the noise level at each jack meets the
following conditions.
OUTPUT 1, 2 -88dBu or less
OUTPUTs 3 - 8 -85dBu or less
PHONES L,R -85dBu or less
[Miscellaneous]
Set each controller to the factory default settings as
follows.
POWER SW STANDBY
PHANTOM SW OFF
INPUT 1 LINE (Gain Volume min)
INPUT 2 LINE (Gain Volume min)
INPUTs 3 - 8
OPTICAL SELECT
MONITOR VOLUME
MASTER VOLUME
(Gain Volume min)
ADAT NORMAL
min
min