Roland V-Synth XT, Заметки по обслуживанию

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V-SynthXT
3: Memory Test
fig.13-4.eps
NOR FLASH, SDRAM, EEPROM, and ESP will be checked automatically.
If all tests are OK, you will automatically proceed to the next test item.
4: MIDI Test
fig.13-5.eps
Check MIDI connections.
Use a MIDI cable to connect the MIDI IN and MIDI OUT.
If the connection is correct, the display will indicate “CONNECT:OK”.
Then you will detouch the MIDI cable, automatically proceed the next test
item.
5: Sound Test
When performing this test, re-check the connections of your speakers, etc.
fig.13-6.eps
Set [VOLUME] and [INPUT] knobs to the maximum setting.
First check the MAIN OUT output.
Connect the Oscilloscope.
Press [ ].
The MAIN OUT-L will output a triangle wave, and the MAIN OUT-R will
output sine wave.
Check the audio and the waveform.
Next check L(MONO).
Unplug the MAIN OUT-R jack.
Verify that MAIN OUT-L outputs a signal that combines a sine wave and
triangle wave.
Reinsert tha MAIN OUT -R jack, and press [ ] to proceed the next step.
Check the DIR OUT and the INPUT.
Verify that the cables has correctly coneected, between DIR OUT L/R and
INPUT L/R.
The sound output from DIR OUT L/R is input to INPUT L/R, and it is output
from MAIN OUT L/R.
A triangular wave is output in MAIN OUT-L and the sine wave is output to
MAIN OUT-R.
Press [ ] to proceed to the next step.
Verify that the wave amplitude of MAIN OUT quadruples, because GAIN of
INPUT b12dB.
Press [ ] to proceed to the next step.
Verify that the waveform disappeared and OUTPUT sound muted, because
INPUT turns off.
Press [ ] to proceed to the next step.
Check the INPUT (MIC) input.
Connect the DIR OUT R and MIC jack of front panel.
Confirm the MIC switch and the position to be NORMAL.
Verify that the only MAIN OUT R will output the sine wave.
Turn the INPUT knob and confirm the change of sound output.
The sound leaks a little even if INPUT is turned to the left end.
Press [ ] to proceed to the next step.
Verify that the waveform disappeared and MAIN OUT R sound muted even if
INPUT is turned.
Press [ ] to proceed to the next step.
Check DIGITAL IN 96kHz.
Input the digital audio from an external device at a sampling rate of 96kHz to
the IN B (coaxial) jack.
Check the sound that the input audio data will output to MAIN OUT L/R.
Press [ ] to proceed to the next step.
Input the digital audio from an external device at a sampling rate of 96kHz to
the IN A (optical) jack.
Check the sound that the input audio data will output to MAIN OUT L/R.
Press [ ] to proceed to the next step.
Check DIGITAL OUT.
Connect the external digital audio input device (MA-10D, etc.), to OUT B
(coaxial) jack.
Check the sound or wave shape of connected external device.
The digital audio data from OUT B; L channel is triangle wave and R channel is
Problem Items to check
NOR FLASH NG MAIN BOARD IC39
SDRAM NG MAIN BOARD IC5,8,9,10
EEPROM NG MAIN BOARD IC7
ESP NG MAIN BOARD IC40,IC41
Problem Items to check
“OK” does not apear JACK BOARD
JK8,IC10,IC11,Q20,CN6
MAIN BOARD
CN9,IC538,IC539,IC18