Test Program - Yamaha MU100 Service Manual

MU100

TEST PROGRAM

PREPARATIONS
The following measuring instruments and jigs are
necessary during the test.
Measuring instruments :
Audio signal generator, oscilloscope,
amplifier/speaker system, etc.
Jigs : MIDI cables, etc.
No. Test Remarks
A TEST ENTRY
PROCEEDING THROUGH THE TEST AND
B
SELECTION WHEN AN ERROR IS DETECTED
1 SRAM SRAM Read/Write
2 BATTERY A/D check on CPU
3 LCD ALL DOTS ON
4 SWITCH & LED SWITCH ON/OFF & LED ON/OFF
5 DIAL Not using
6 MIDI 1 Connect MIDI IN A to MIDI OUT
7 MIDI 2 Connect MIDI IN A to MIDI OUT
8 HOST SELECT Slide HOST SELECT
9 TO HOST TX/RX Factory use
10 WAVE ROM WAVE ROM READ
11 1 kHz OUTPUT(L) Using measuring instruments
12 1 kHz OUTPUT(R) Using measuring instruments
13 1 kHz INDIV.OUT1 Not using
14 1 kHz INDIV.OUT2 Not using
15 INPUT HIGH Using measuring instruments
16 INPUT LOW Using measuring instruments
17 MEG & DRAM Using measuring instruments
18 64 SOUNDS OUTPUT By listening
19 FACTORY SETTINGS
20 EXIT
21 PB1 NAME Circuit Board test of CN 1
22 PB1 RAM Circuit Board test of CN 1
23 PB1 MIDI IN Circuit Board test of CN 1
24 PB1 MEL Circuit Board test of CN 1
25 PB2 NAME Not using
26 PB2 RAM Not using
27 PB2 MIDI IN Not using
28 PB2 MEL Not using
The test "Not using" is written in the column of remarks
and is not performed on the MU100.
When performing the tests numbered 21 to 24, connect the
Plug-in Board to the connector CN1of the MU100 before
starting the test.
18
A. HOW TO ENTER THE TEST PROGRAM
While pressing the [PLAY] and the [MUTE/SOLO]
buttons, turn the MU100 POWER switch on.
When the test program is initiated, the version of the
program ROM will appear on the LCD.
MU100 TEST MODE
Ver#. ## ##-###-##
(#.##=Version number of the MU100 program ROM)
After displaying the version message shown above, the
following display will appear.
01 RAM
The factory settings should be performed before any test
when a circuit board or the backup battery is replaced. The
factory settings are performed by turning the MU100
POWER switch on while pressing the [UTIL] and the
[ENTER] buttons.
B. PROCEEDING THROUGH THE TEST
When entering the test program, the following display will
appear.
01 RAM
Use the [SELECT ] and [SELECT ] buttons to move
through the various tests of the test program.
After having selected the test, press the [ENTER] button to
start the test in succession from that number.
Pressing without selecting the test will start the test from
"1. SRAM test".
TEST SELECTION WHEN AN ERROR IS
DETECTED
In each test, if an NG (No Good) error is detected, press the
[EXIT] button. The MU100 will then wait for the entry of a
test number.
1. SRAM TEST
01 RAM
The Write/Read check for SRAM (IC 9 and IC 10) will be
performed automatically on the following address.
IC9, IC10= h'200000 ~ h'20FFFF (16-bit Data Bus)
DISPLAY OF TEST RESULTS
OK
01 RAM
ok
NG
01 RAM
err
TEST END
After displaying the test result on the LCD, the test will be
completed and proceed to the next test. If an error is
detected during the test, refer to section B, "PROCEEDING
TROUGH THE TEST". All SRAM data is preserved.
2. BATTERY TEST
02 BATTERY
This test checks that the voltage of the battery is greater
than 2.9 V and less than 3.4 V.
DISPLAY OF TEST RESULTS
OK
02 BATTERY
ok
NG
02 BATTERY
err
TEST END
After displaying the test result on the LCD, the test will be
completed and proceed to the next test. If an error is
detected during the test, refer to section B, "PROCEEDING
TROUGH THE TEST".
3. LCD-ALL DOTS "ON" TEST
Check that all dots of the LCD change to black.
After checking the back light, press the [SELECT]
button to control the LCD contrast in eight (8) steps.
TEST END
Press the [ENTER] button. The MU100 will then
proceed to enter the following test.
If the [EXIT] button is pressed, the MU100 will wait
for the entry of the test number.
4. SWITCH & LED TEST
04 SWITCH & LED
[PLAY]
Press the panel switches consecutively from the [PLAY]
button to the [VALUE+] button, according to the order
indicated on the LCD. At this time, check that the LED of
the testing switch is lighted up.
04 SWITCH & LED
[ENTER]
(e.g. when checking the [ENTER] switch)
The switch & LED test proceeds in the order as below.
[ P L A Y ] [ U T I L ] [ M O D E ] [ E D I T ]
[EFFECT] [EQ] [MUTE/SOLO] [ENTER]
[EXIT] [PART-] [SELECT ] [VALUE-]
[PART+] [SELECT ] [VALUE+]
If the switch is OK, a beep will sound and the test will
proceed to the next switch. If the wrong switch is pressed,
the program does not proceed and no sound will heard.
DISPLAY OF TEST RESULTS
OK
04 SW & LED
ok
NG no appearing
TEST END
When the button [VALUE+] is pressed, if the test is OK, the
test will be completed and proceed to the next test.
If an error is detected during the test, turn the POWER off.
5. DIAL TEST
This test is not performed on the MU100. After pressing
the [EXIT] button, press the [SELECT ] or [SELECT
button to select the next test.
6. MIDI 1 TEST
After connecting the [MIDI IN A] to the [MIDI OUT] and
the [MIDI THRU] to the [MIDI IN B] via MIDI cables,
execute the test. The [HOST SELECT] switch must be set
at the [MIDI] during the test.
06 MIDI 1
DISPLAY OF TEST RESULTS
OK
06 MIDI 1
ok
NG
06 MIDI 1
err
TEST END
If the test is OK, "OK" will be displayed on the LCD and
the test will be completed and proceed to the next test. If an
error is detected during the test, refer to section B,
"PROCEEDING TROUGH THE TEST".
7. MIDI 2 TEST
After connecting the [MIDI IN A] to the [MIDI OUT] and
the [MIDI THRU] to the [MIDI IN B] via MIDI cables,
execute the test. The [HOST SELECT] switch must be set
at the [MIDI] during the test.
07 MIDI 2
DISPLAY OF TEST RESULTS
OK
07 MIDI 2
ok
NG
07 MIDI 2
err
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