Yamaha MU100 Service Manual page 22

MU100
DISPLAY OF TEST RESULTS
OK
21 PB1 NAME
PLG100-VL
(X.XX: version number)
NG
21 PB1 NAME
(When not receiving the data from Plug-in Board)
TEST END
Press the [ENTER] button. The MU100 will then
automatically proceed to the next test.
If the [EXIT] button is pressed, the MU100 will wait for
the entry of the test number.
22. PB1 RAM TEST
22 PB1 RAM
Check that the circuit board RAM, which is connected to
connector CN1, functions correctly.
DISPLAY OF TEST RESULTS
OK
22 PB1 RAM
NG
22 PB1 RAM
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".
23. PB1 MIDI IN TEST
23 PB1 MIDI IN
Check that the MIDI IN, which is connected to the connector
CN1, functions correctly.
After connecting the MIDI IN A jack to the MIDI OUT
jack via a MIDI cable, execute the test. At this time the
HOST SELECT switch should be set at MIDI.
DISPLAY OF TEST RESULTS
OK
23 PB1 MIDI IN
NG
23 PB1 MIDI IN
22
VX.XX
err
ok
err
ok
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".
24. PB1 MEL
24 PB1 MEL
Check that the CN1-MEL IN/OUT functions correctly and
the correct signal is output from the OUTPUT (L,R).
A signal is input from the AD input, goes through the DM
circuit board and output from the CN1-MEL OUT. The
signal travels from the CN1-MEL OUT to the circuit board
connected to the CN1 connector, and the tone generator of
the circuit board translates the signal into a 1 kHz sine
wave. This sine wave travels through the MEL OUT and
CN1-MEL IN, then is output as sound. If the effect circuit
board is connected to the CN1 connector, the signal is not
translated and the same signal as it received is returned to
the DM circuit board through the MEL OUT and CN1-
MEL IN, then is output as sound.
Insert the appropriate phone plug into the OUTPUT(L,R)
and check the output.
The VOLUME control must be set at maximum for this
test.
ITEMS TO BE CHECKED
OUTPUT(L): 1 kHz +/-3 Hz, 4.0 dBm +/-2 dBm (VH)
1 kHz +/-3 Hz, 3.2 dBm +/-2 dBm (VL)
OUTPUT(R): 1 kHz +/-3 Hz, 4.0 dBm +/-2 dBm (VH)
1 kHz +/-3 Hz, 3.2 dBm +/-2 dBm (VL)
TEST END
Press the [ENTER] button. The MU100 will then
automatically proceed to the next test.
If the [EXIT] button is pressed, the MU100 will wait for
the entry of the test number.
25. PB2 NAME TEST
26. PB2 RAM TEST
27. PB2 MIDI IN TEST
28. PB2 MEL TEST
This test is not performed on the MU100. After pressing
the [EXIT] button, press the [SELECT
button to select the next test.
] or [SELECT ]