Yamaha 01x, Service Manual

Page: 73 / 153

73
O1X
4.10 LED lighting check (RE circuit board) .....
(10) LED (RE)
(1) Outline
The LED on the panel is checked visually for proper lighting
by making the segments light from the upper left to the lower
right one after another and then making all the LED segments
light up.
10:LED (RE)
Lighting sequence: All LED segments from the upper left to the
lower right on the panel
Double color LED should light in the following order.
Green: ON, Red: OFF -> Green: OFF, Red: ON -> Green:
ON, Red: ON (orange)
(2) Execution method in the normal state
After confirming visually that all LED segments light properly,
press [KNOB-8], and the screen returns to the execution select
screen and "O" is displayed in the check item space.
10:LED (RE)
NG OK
(3) Execution method in the faulty state
To terminate before the end due to an error, press "KNOB-7".
The screen returns to the execution select screen and "X" is
displayed in the check item space.
(4) Item description and error message
None
(5) Check point when judged as NG
The devices that can be diagnosed by this check are as follows.
Circuit board Device name Function
DM CPU (IC101) Control of CI-SUB
DM CI-SUB (IC403) Gate array for control of LED
matrix, etc.
RE LED (LD***) LED
4.11 LCD display check .....
(11) LCD
(1) Outline
Have all the dots of the LCD screen turned on, off and then on
to check visually that there is no scratch on the screen, missing
dot or entry of dust.
The entire screen flashes.
(2) Execution method in the normal state
After all the dots light up, the LCD appears as shown below.
Upon confirmation of proper lighting, press [KNOB-8]. The
screen returns to the execution select screen and "O" is displayed
in the check item space.
11:LCD
NG OK
(3) Execution method in the faulty state
If there is a fault such as dot missing, press [KNOB-7]. The
screen returns to the execution select screen and "X" is displayed
in the check item space.
(4) Item description and error message
None
(5) Check point when judged as NG
The devices that can be diagnosed by this check are as follows.
Circuit board Device name Function
DM CPU (IC101) Control of LCD module
Entire LCD module (20) LCD module
assembly (with built-in driver)
4.12 DSP6 function check .....
(12) DSP6
(1) Outline
Each signal related to DSP6 is checked and the check result is
displayed on the LCD.
12:DSP6
DSP6 TEST NOW...
The following signal items are checked one after another.
1: CPU Interface (Data Bus 1)
2: CPU Interface (Data Bus 2)
3: CPU Interface (Chip Select , TXB)
4: CPU Interface (Address Bus)
5: CPU Interface (BUS W/R Reg.)
6: DRAM Interface (Data Bus)
7: DRAM Interface (Address Bus)