Roland V-Synth Service Notes page 21

Mar.2003
Check DIGITAL OUT 48KHz.
• Audio at a sampling rate of 48 kHz will be output from the OPTICAL
OUT jack.
* Set your speakers for optical input.
• A triangle wave will be output from L, and a sine wave from R.
• Check the audio, and press [
Check DIGITAL OUT 44.1KHz .
• Audio at a sampling rate of 44.1 kHz will be output from the OPTICAL
OUT jack.
* Set your speakers for optical input.
• A triangle wave will be output from L, and a sine wave from R.
• Check the audio, and press [
Problem
No sound is output for any test
No sound from MAIN OUT
MAIN OUT L&R NG
MAIN OUT L only NG
MAIN OUT R only NG
DIRECT OUT L&R NG
DIRECT OUT L only NG
DIRECT OUT R only NG
COAXIAL IN NG
No output from COAXIAL OUT
OPTICAL IN NG
No output from OPTICAL OUT
6:LCD Test
fig.13-7_70
Check the LCD.
• Press [ ].
• A pattern in four-level greyscale will appear in the LCD. Turn the
contrast adjustment knob all the way to left and right, and verify that the
contrast changes. Then adjust the knob for optimal contrast.
fig.13-8_70
• Press [ ].
23
] to proceed to the next step.
] to proceed to the next step.
Items to check
MAIN BOARD
MAIN BOARD IC545
MAIN BOARD
MAIN BOARD
MAIN BOARD CN512,
MAIN BOARD
MAIN BOARD
MAIN BOARD JK502
MAIN BOARD JK502
MAIN BOARD CN507
MAIN BOARD CN508
• Verify that the all-pixel-on screen is not missing any pixels, and that the
darkness is uniform.
fig.13-9_70
• Press [ ].
• Verify that the all-pixel-off screen has no pixels "stuck on," nor any
obvious extraneous display artifacts.
fig.13-10_70
• Press [ ] to proceed to the next test item.
Problem
Contrast does not change
Incorrect display
7: Encoder Test
fig.13-11_70
Check the encoder.
• Turn the encoder clockwise once, and counter-clockwise once. If
clockwise rotation produces a value of +24 and counter-clockwise
rotation produces a value of -24, the LCD screen will indicate "OK," and
Items to check
SUB BOARD VR1A,IC20,Q25
LCD BOARD CN17,Q30
MAIN BOARD IC501,IC503,CN501
LCD BOARD CN16,CN17