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MU128
Preparations
The following measuring instruments and jigs are
required for testing the equipment
Measuring instruments:
Low-frequency oscillator (Distortion factor:
0.1 %
or less), Frequency counter,
Oscilloscope (Input impedance: 1 MÙ or
more), Level meter (JIS-C curve), Analog
currugated analyzer, Keyboard amplifier
Jigs:
MIDI cable, PB (plug-in board)
Test
Test title
number
A
TEST ENTRY
B
STARTING THE TESTS
1
SRAM
2
BATTERY
3
LCD DOT BLINK AND CONTRAST
4
LED
5
SWITCHES
6
DIAL
7
MIDI 1 A Front
8
MIDI 2 A Rear
9
MIDI 3 B
10
MIDI 4
11
HOST SELECT
12
TO HOST
13
WAVE ROM
14
1 k Hz O U T P UT (L) S IG N AL S O U N D
15
1 k Hz O U T P UT (R ) SIG NA L SO U ND
16
A/D INPUT HIGH
17
A/D INPUT LOW
18
SDP AND DRM
19
C HE C KIN G T HE 128 S IG N AL S O U N DS
20
PB1 NAME
21
PB1 RAM
22
PB1 MIDI IN
23
PB1 MEL
24
PB2 NAME
25
PB2 RAM
26
PB2 MIDI IN
27
PB2 MEL
28
PB3 NAME
29
PB3 RAM
30
PB3 MIDI IN
31
PB3 MEL
32
FACTORY SETTINGS
33
EXIT
Note 1: For tests 20 to 23, the plug-in board should be
connected to the CN5 of the DM sheet on the
equipment before turning ON the power supply.
Note 2: For tests 24 to 27, the plug-in board should be
connected to the CN4 of the DM sheet on the
equipment before turning ON the power supply.
Note 3: For tests 28 to 31, the plug-in board should be
connected to the CN1 of the DM sheet on the
equipment before turning ON the power supply.
The tests shown below need not be conducted as
part of the inspection of MU128.
21 PB1 RAM
25 PB2 RAM
29 PB3 RAM
18
A. TEST ENTRY
To turn ON the equipment, press the STAND BY/ON
button while pressing the PLAY and MUTE/SOLO
buttons at one time.
MU128 TEST MODE
Ver#.## ##-###-##
Ver #.## shows the version number of the product
program ROM.
Precautions before starting the test
Before starting a test immediately after the end of the
assembly or battery replacement, press STAND
BY/ON while pressing the UTIL and ENTER buttons
at one time.
This step will change the inputted
values over to the factory settings.
B.
Starting the tests
Press the SELECT
/
numbers desired. Then press the ENTER button. The
tests with their numbers selected will be then conducted
in sequence.
When the ENTER button is pressed without any test
numbers selected, the tests listed will be conducted in
numerical order, starting with the "1. SRAM " test.
When the test being conducted is finished without any
problems, ok will appear and the next test will be
conducted automatically.
conducted automatically, refer to "Ending the test" for
each item.
The screen for selecting the test number desired will be
indicated by pressing the EXIT button, whether the
equipment fails in the test being conducted or not.)
If an error occurs during the "5.SWITCHES" test,
however, refer to "Ending the test".
1. SRAM
01 RAM
Write/read the data in the SRAM field and check/verify
the data.
All the SRAM data will be saved.
Displaying the test result
OK
01 RAM
NG
01 RAM
2. BATTERY
02 BATTERY
The battery voltage is checked by the A/D of the CPU (IC
21). Make sure that the voltage is in the range from 2.9
to 3.4 V.
Displaying the test result
OK
02 BATTERY
button and select the test
If the next test is not
ok
err
ok
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