Roland V-Synth XT Service Notes page 27

fig.13-11.eps
Press [ ] to proceed to the next test item.
Problem
The contrast doesn't change.
The defect is confirmed to the LCD
display.
7: Encoder Test
fig.13-12.eps
Check the Rotary Encoder using the [VALUE] knob.
Turn the [VALUE] knob 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"
If both rotations are "OK", you will automatically proceed to the next test item.
Problem
"OK" is not displayed.
Items of check
Confirm the FPC cable is surely
connected between MAIN and MIC
BOARD.
PANEL BOARD: VR11
MIC BOARD: IC23
Exchange the LCD ASSY.
Items of check
Confirm the FPC cable is surely
connected between ENCODER and
INVERTER BOARD.
ENCODER BOARD: EN1, CN3
INVERTER BOARD: CN23
8: A/D Test
fig.13-13.eps
Check the rotary knobs (E1-E8).
Check each knob in order to E1 to E8.
If the order is incorrect, the "OK" indication will not be displayed.
It turns in order of control knob "Left-right-left".
Turn the knob to the left end, the first "OK" is displayed.
Turn the knob to the right end, the second "OK" is displayed and beep is
sounded.
Turn the knob to the left end again, the third "OK" is displayed and beep is
sounded.
The third "OK" means completion. Operate the next knob similarly.
A sweep tone will be output during the operation.
If the check of all of the eight knobs is completed, you will automatically
proceed to the next test item.
Problem
"OK" is not displayed.
9: Touch Panel Calibration
Calibrate the touch panel.
A touch pen is used for calibration.
fig.13-16.eps
Using the touch pen, touch the center of "+" symbol enclosed the box.
When the touch has been detected, the box will move to the next point.
Verify that the V-Synth XT produces a beep when you touch the screen.
When you have touched all four points on the screen, calibration willbe
performed.
If calibration was successful, the display will indicate "Caribration:OK" and
you will automatically proceed to the next test.
If calibration was unsuccessful, you will return to the calibration screen.
V-SynthXT
Items of check
PANEL BOARD: VR1-8,IC1
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