Yamaha 01x Service Manual page 76

O1X
Signal items to be checked
1: Audio signal loop-back
2: Word clock frequency (48KHz) and lock
3: Word clock control, synchronization detection
4: Connection of MLAN M/S-IN and MLAN M/S-OUT
terminals
5: MIDI (3 systems) (* There are 5 MIDI systems but two
of them which are not via CPU cannot be tested.)
When proper operation is confirmed in the test at 48kHz, the
message as shown below is displayed.
14:mLAN
AUTO TEST OK (CHECK MIDI-A,B &SET FS 96K)
In this state, input the MIDI signal to the IN terminal of the
MIDI-A and B terminals and check that the MIDI signal is output
from the OUT terminal of the MIDI-A and B terminals.
<96kHz test>
8-7) Click on "Jitter".
8-8) Click on "96.0kHz".
8-9) Press [KNOB-8] of the O1X, and the 96kHz word clock
test is started automatically.
14:mLAN
mLAN TEST NOW...
Signal items to be checked
1: Word clock frequency (96kHz) and lock check
When proper operation is confirmed in the word clock
test (96kHz), the screen returns to the execution select
screen and "O" is displayed in the check item space.
9
After the [mLAN 1] terminal test, connect the IEE1394 cable
to the [mLAN 2] terminal this time and execute 8 test item
again.
10
Restoring the user data
Execute "Restore" of USERDATA, and the user data will
be restored in the memory of the O1X.
Caution
The screen display of the PC is not shown in this manual. As
only button names are described, check these names before
execution of testing.
Note that clicking on "Writing EEPROM" will restore the factory
set data before shipment and the user data will be erased.
(3) Execution method in the faulty state
Each item is checked one by one and if there is a faulty condition,
ERROR and an error message are displayed. In such case, press
[KNOB-8], and checking comes to an end. The screen returns
to the execution select screen and "X" is displayed in the check
item space.
76
14:mLAN
ERROR:xxxxxxxxxxxxx
(4) Item description and error message
1: Loop-back check using audio IN/OUT terminal SIO of
the audio signal loop-back -> DSP7
Error message: ERROR: AUDIO
2: Word clock frequency and lock (48KHZ operation) ->
Frequency check of the word clock output from the
MLN2 circuit board
Error message: ERROR: WORD CLOCK 48
OK
3: Word clock control, synchronization detection ->
Synchronization detection circuit check
Error message: ERROR: SYNC
4: MLAN M/S-IN • S-OUT signal -> signal connection
check
Error message: ERROR: mLAN M SIGNAL
5: MIDI -> MIDI loop-back check
Error message: ERROR: SCI X (X represents the serial
channel number)
6: Word clock frequency and lock (96KHz operation)
Error message: ERROR: WORD CLOCK96
(5) Check point when judged as NG
The devices that can be diagnosed by this check are as follows.
Circuit board Device name
DM CPU (IC101)
DM DSP7 (IC210)
DM PLLP2 (IC602)
DM DIR2 (IC608)
DM TLC2932 (IC609) PLL for FS=88.2k/96kHz
MLN2 PH2 (IC7)
MLN2 MLAN-NC1 (IC8) (MIDI Packet) for control of mLAN2
4.15 Word Clock function check .....
(1) Outline
The operation of the word clock is checked.
(2) Execution method in the normal state
When proper operation of all items is confirmed, the screen
returns to the execution select screen and "O" is displayed in the
check item space.
EXIT
Function
Control of MIDI signal and mLAN2
control signal
Execution of audio signal input/output
with MLN2 circuit board
Change of word clock and address
decode to DSP7
PLL for FS=44.1k/48kHz
(AUDIO Packet) for control of mLAN2
(15) W. CLOCK