Yamaha M7CL-32, Service Manual

Page: 136 / 375

M7CL-32/M7CL-48
136
The LEDs are divided into the following blocks for individual
lighting.
· INPUT #1-8
· INPUT #9-16
· INPUT #17-24
· INPUT #25-32
· INPUT #33-40 (M7CL-48 only)
· INPUT #41-48 (M7CL-48 only)
· STIN #1-4
· STEREO/MONO
· DCA #1-8
· USER DEFINE/NAVIGATION
· If any one switch is being pressed, the lighting order of all
blocks will be reversed.
· If any two switches are pressed simultaneously and released,
the lighting order of all blocks will be put back.
3) Fader Inspection
Checks faders on the circuit board.
a) Checking travel time through software voltage control
(software automatic judgment)
Measures the time it takes to move 2—98 % of full stroke under
voltage control and the software judges automatically.
For the fader judged as “NG”, movement position plot data are
shown just after the judgment. If there is any fader with
unacceptable judgment (NG), perform this checking up to twice.
Check the followings.
· Check that “OK” is shown on the PC display.
(Upward travel time and downward travel time of each fader
are shown as well.)
∗
Details of software travel time measurement
1. Move all the faders to the bottom end.
2. Move one fader to the top end and measure the travel time.
3. Move it to the bottom end and measure the travel time.
* Execute the above measurement to all the faders.
4. Displays results and travel time.
The judgment result is shown by lighting of the SEL/ON LED
located above each fader.
If the upward travel time is NG, SEL-LED will light and if the
downward travel time is NG, ON-LED will light.
Measurement time of each fader will be displayed on the PC
connected with ETHER MIDI.
Check the followings.
· Make sure that all the SEL/ON LEDs above each fader are
turned off.
(At the same time, travel time of each fader is shown on the
connected PC.)
Press any one key and then release it to proceed to the next
fader test.
b) Position measurement test (Software automatic
judgment)
Drives to the position to be judged and the software automatically
judges if the A/D value is within the specified limits.
Check the followings.
· Check that “OK” is shown on the PC display.
(At the same time, A/D value of each fader is shown in the
order of lower limit/center/upper limit.)
∗
Details of software automatic measurement
Drives in the order mentioned below and judges the A/D values
by reading them at respective positions.
Permissible range when judging the stop position is the same
as the STOP RANGE2 values during fader control.
1. Move to the bottom end for preparation.
2. Moves to the center and measures. (496 +/–7)
3. Moves to the top end and measures. (1010 +/–7)
4. Moves to the bottom end and measures. (2 +/–7)
The judgment result is shown by lighting of the SEL/CUE/ON
LEDs above each fader.
If the top end is NG, SEL-LED will light. If the center position
is NG, CUE-LED will light. If the bottom end is NG, ON-LED
will light.
Check the followings.
· Make sure that all the SEL/CUE/ON LEDs above each fader
are turned off.
Press any one key and then release it to proceed to the next
fader test.
c) Voltage level output test (software automatic judgment)
The software automatically judges if the 5 bit value outputting
voltage level is output correctly.
If there is any fader with unacceptable judgment (NG), perform
this checking up to three times.
Check the followings.
· Check that “OK” is shown on the PC display.
(At the same time, bit judgment result for each fader is shown
by the 5 bit in the order of judgment.)
∗
Details of software automatic measurement
Drives faders in all the patterns with different test bit and
measures the travel time.
Judges by the difference in the time.
1. Move to the bottom end for preparation.
2. Moves to the top end (10000B) and measures the travel time.
3. Move to the bottom end for preparation.
4. Moves to the top end (10001B) and measures the travel time.
5. Move to the bottom end for preparation.
6. Moves to the top end (10010B) and measures the travel time.
7. Move to the bottom end for preparation.
8. Moves to the top end (10100B) and measures the travel time.
9. Move to the bottom end for preparation.