Roland JX-305 GrooveSynth - Page 12

JX-305 Sep. 1998
12
Troubleshooting for Pedal test
5. SW & LED Test
When Pedal Test ends normally, SW & LED Test runs
automatically.
(or in the initial display of the test mode, press [BANK 5]
while holding down [SHIFT])
5-1. When SW & LED test starts, the following display
appears.
Are All LEDs turn on ?
5-2. Press all buttons one by one. Then each button, names
of buttons appear on the display, and sounds.
And buttons that have corresponding LEDs are put out
its LEDs.
Press the all buttons for turning off the all LEDs.
•When you press [PLAY] button, press two times.
When you press [TEMPO & MEASURE], press three
times. And check that the Beat LED turns GREEN
and RED and off in order.
Is button name appeared on the display ?
Are all LEDs turn off ?
NOTE: If you press two buttons simultaneously, the LCD
display error.
5-3. If test ends normally, press [ENTER] to start next test.
Troubleshooting for SW & LED test
6. AD Test
When SW / LED Test ends normally, AD Test runs
automatically.
(or in the initial display of the test mode, press [BANK 6]
while holding down [SHIFT].)
6-1. Connect the Expression to the Control Jack.
6-2. When AD test starts, the JX-305 into standby mode.
Move each knob, name and value of the knob are
displayed.
Move the all knobs and sliders fully one by one.
(excluding "VOLUME")
NOTE: If you move the knobs and Bender, Modulation, Ctrl
Pedal, knobs simultaneously, the LCD display error.
To abort a command, press [BWD] button.
Press on the Control Pedal.
Check that the value changes 0 from 127.
Check the mid value 64 when move Env Depth.
Result of Test
No response
Display remains "on"
Check
Check Q4
Is signal level of the PEDAL change ?
Check the condition of connection of
L9-12,R47,48
Result of Test
One of the LEDs
dose not lit.
Two or more LEDs
do not lit.
One of the SWs
dose not work.
TWO or more SWs
do not work.
LED stays on.
Check
Check the condition of connection of
LED.
Refer to the circuit diagram, check
the transistor, buffer (74HC245), or
decoder (74HC138) around the LED
circuitry.
Check the diode and condition of
connection of SW.
Refer to the circuit diagram, check
the decoder and transistor array.
Check the short circuit of signal lines
of LED.