Inspections - Yamaha ACU16-C Service Manual

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INSPECTIONS

1. Preparation
1.1 Conditions
Unless otherwise specified, use the following conditions.
UNIT ID switch setting : "0"
0dBu = 0.775 Vrms
0dBFS = 0 decibel full scale
Use DME32 as the audio signal source.
Insert "MYT8-AE" into the slot 1 and slot 2 of DME32.
Set MASTER CLOCK of DME32 to "INTERNAL".
Apply the audio signal to AES/EBU1 and AES/EBU2 of NHB32-C (for jigs).
Using the LAN cable (CAT5, cross cable), connect NHB32-C (for jigs) to the PRIMARY side of CobraNet.
Set PATCH of the NHB32-C (for jigs) to "03".
Make following settings for PATCH "03".
The CH1 to CH8 input of AES/EBU 1 is output at CH1 to CH8 of CobraNet.
The CH1 to CH8 input of AES/EBU 2 is output at CH9 to CH16 of CobraNet.
Set MASTER CLOCK of NHB32-C (for jigs) to "AES/EBU 1 1/2".
Use 10kΩ for the load of the analog output.
Use 100kΩ or more input impedance for the oscilloscope, level meter and distortion meter.
Correct the noise measurement by LPF of 12.7 kHz, -6dB/OCT.
(Use measurement by the average value instead of the effective value.)
Correct the distortion measurement by 80KHz, -6dB/OCT LPF.
1.2 Firmware version
TE
The version of the firmware for NHB32-C (for jigs) used for inspection is also specified as follows.
L 13942296513
NHB32-C (for jigs)
Version
V1.02 (Jig NHB)
1.2.1 Confirmation of version
The version can be confirmed on the PC screen at the start-up of the TEST program.
For the details, refer to 1.3 How to start the TEST PROGRAM.
1.2.2 Revision of version
For the details, refer to 6. Upgrading of version of the TEST PROGRAM.
2. Inspections
2.1 Connection
OUT
CH1~16
www
.
http://www.xiaoyu163.com
LAN Cable (cross)
PRIMARY SECONDARY
CobraNet
ACU16-C
x ao u163
y
i
http://www.xiaoyu163.com
2 9
8
Q Q
3 6 7 1 3 1 5
DME32
SLOT1
MY8-AE
AES/EBU
PRIMARY AES/EBU 1
co
NHB32-C
.
(for Jigs)
9 4 2 8
0 5 8 2 9 9 4 2 8
(Audio Signal)
SLOT2
MY8-AE
AES/EBU
m
AES/EBU 2 25P D-sub
cable for MY8-AE
(cross)
ACU16-C
9 9
9 9
29