Roland JX-305 GrooveSynth - Instrument Mixer Settings; Adjusting Volume and Pan

JX-305 Sep. 1998
14
8-4. When test ends, press [ENTER] to start next test.
Troubleshooting for Sound Test
9. DSP Test
When Sound Test ends normally, DSP Test runs
automatically.
(or in the initial display of the test mode, press [NUMBER 1
(BD)] while holding down [SHIFT])
9-1. When DSP test starts, test runs automatically and 7 part
are checked.
If test result are OK, "o" appears on the display and if
NG, "x" appears on the display.
9-2. If test results is OK, press [ENTER] to start next test.
Troubleshooting for DSP test
10.LCD & Encoder Test
When DSP Test ends normally, LCD test runs automatically.
(or in the initial display of test mode, press [NUMBER 2
(HH)] while holding down [SHIFT]).
10-1. When LCD & Encoder Test starts, all dots of the LCD
will light.
Check that the contrast of the LCD changes by rotating
the encoder clockwise and counter clockwise.
Check that all LEDs (([BANK 1] Å` [NUMBER 8])
turn on.
10-2. When test ends, press [ENTER].
Troubleshooting for LCD & Encoder Test
11.Bender test & Factory Data set
When LCD & Encoder Test ends normally, Bender test &
Factory Data set runs automatically.
(or in the initial display of the test mode, press [NUMBER 3
(HH)] while holding down [SHIFT])
11-1. When Bender test & Factory Data set starts, the
following display appears.
11-2. Push the bender lever leftward lightly and then
gradually return it to the original position.
11-3. Push the bender lever rightward lightly and then
gradually return it to the original position.
11-4. Press [REC] button.
The follow display will appear.
Result of Test
No sound
Sound is too loud,
soft or distorted
Check
Check D/A converter (AK4324;IC24)
Check IC3 on PB, IC23, 25 on MB
Check around filter circuitry distorted
Result of Test
"x" displayed
Check
Check IC33
Bleak or etc
Check IC6
Pin 119-143
Result of Test
One of the dot is
not lit
Contrast of the
LCD is not
changed
Contrast of the
LCD is pale, even
if adjust its contrast
maximum level.
Contrast of the
LCD is dark, even
if adjust its contrast
minimum level.
LED dose not
change
Check
Replace the LCD unit.
Check R249
Is PWM waveform input to the QFP
side of the R262?
Check DA7
Is there short in the circuit ?
If the above check points are normal,
replace the LCD unit.
Check MAIN BOARD IC31 Pin 91, 92
Is pulse generated ?>Check the
condition of connection of R29, 30,
C96, 97 on the MAIN BOARD