Roland JX-305 GROOVESYNTH Service Notes page 14

JX-305
8-4. When test ends, press [ENTER] to start next test.
Troubleshooting for Sound Test
Result of Test Check
No sound Check D/A converter (AK4324;IC24)
Sound is too loud, Check IC3 on PB, IC23, 25 on MB
soft or distorted Check around filter circuitry distorted
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
Result of Test Check
"x" displayed Check IC33
Bleak or etc
Check IC6
Pin 119-143
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
Result of Test Check
One of the dot is Replace the LCD unit.
not lit
Contrast of the Check R249
LCD is not Is PWM waveform input to the QFP
changed side of the R262?
Contrast of the Check DA7
LCD is pale, even Is there short in the circuit ?
if adjust its contrast
maximum level.
Contrast of the If the above check points are normal,
LCD is dark, even replace the LCD unit.
if adjust its contrast
minimum level.
LED dose not Check MAIN BOARD IC31 Pin 91, 92
change Is pulse generated ?>Check the
condition of connection of R29, 30,
C96, 97 on the MAIN BOARD
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.
14
Sep. 1998