Roland V-Synth XT Service Notes page 28

MAY.2005
Problem
It fails in the calibration many
times.
10: Touch Panel Check
fig.13-17.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.
If a problem is detected during this check, you will automatically return to the
"Touch Panel Calibration" screen, and calibration will be performed once
again.
When you have touched all four points on the screen and no problems were
detected, you will automatically proceed to the next test.
If touched locations could not be detected correctly, you will automatically
return to the calibration screen.
11: PC-CARD Test
fig.13-20.eps
Check card slot operation.
Insert a PC card into the PC card slot.
Use a PC card formatted by the V-Synth XT.
Press [ ] Write/Read tests will be performed.
If they were successful, the display will indicate "OK".
If the test results were "OK", you will automatically proceed to the next test
item.
Problem
"OK" is not displayed.
32
Items of check
INVERTER BOARD:
IC21,Q41,Q42,CN22,CN24
Exchange the Touch-Panel
(or LCD ASSY)
Items of check
Confirm the FPC cable is surely
locked to the connector of both
MAIN and CARD BOARD.
MAIN BOARD:
IC523,519,526,525,522,520,527
CARD BOARD: CN10,11
12: Switch & LED Test
fig.13-23.eps
Check the switches and LEDs on the panel.
LEFT Panel:
[V-CARD] [PREVIEW] [KEYPAD] [7] [8] [9] [4] [5] [6] [1] [2] [3] [0] [BANK-]
[BANK+]
The button before it operates it is displayed by "@" on the screen.
After the button is operated, "@" is changed to "."
LED will be blinking for about one second, and, next be turned off.
LED of MIDI and USB turn on when all buttons of a left panel are operated.
Press the [ ] button of the right panel, to turn off these LEDs.
The display of the screen changes from "*" into "." at this operation.
RIGHT Panel:
[MODE] [CTRL] [EXIT] [DEC] [ ] [INC] [SHIFT] [
After the button is operated, "O" is changed to "."
When all buttons and VALUE knob (ENTER) at the right of the panel are
pushed, you will automatically proceed to the next test item.
Problem
LED is not turned on.
NG on switch test.
13: Noise Check
Use A noise meter to measure the residual noise.
Set the input filter of noise meter to DIN-Audio.
Verify that the noise is less than -90dBm on MAIN OUT, and less than -84dBm
on DIRECT OUT.
] [ ] [ ]
Items of check
Confirm the FPC cable is surely
connected between PANEL and IN-
VERTER BOARD.
INVERTER BOARD: IC18,Q48-
52,Q31-33,Q44
PANEL BOARD: each of LEDs.
Confirm the FPC cable is surely
connected between PANEL and IN-
VERTER BOARD.
INVERTER BOARD: IC17
PANEL and ENCODER BOARD :
each of switchs.