Roland JX-305 GROOVESYNTH Service Notes page 13

JX-305
6-3. When test ends, press [ENTER] to start next test.
Troubleshooting for AD test
Result of Test Check
No response Inspect the signal path of AS0, AS1,
for breaks or short circuit.
Value does not Check the power supply of the panel
reach the 0 or 127 Check the analog switches
(74HC4051:IC2 on PB)
Inspect the capacitor that is attached
to the potentiometer for short circuit
Error result even if Inspect the signal path of the
move the knob or potentiometer for short circuit
slider one by one Check analog switch whether signal
of AN3, AN4 are not corrupted.
7. After Touch Test
When AD Test ends normally, After Touch Test runs
automatically.
(or in the initial display of the test mode, press [BANK 7]
while holding down [SHIFT])
7-1. When After Touch test starts, the following display
appears.
7-2. Press C7, C4, C2 key firmly one by one.
Check that value increase to 127.
NOTE: If you press the key and Bender,Modulation,Ctrl
Pedal, knobs simultaneously, the LCD display error.
To abort a command, press [BWD] button.
7-3. When After Touch test ends, "ok" appears on the
display.
7-4. If test ends normally, press [ENTER] to start next test.
Troubleshooting for After Touch test
Result of Test Check
No response Check Q30
Check the condition of connection
Value does not Check the power supply of Q7
reach the 0 or 127 Check keyboard
8. Sound Test
When After Touch Test ends normally, SOUND Test runs
automatically.
(or in the initial display of the test mode, press [NUMBER
1(BD)] while holding down [SHIFT]).
8-1. Rotate the VOLUME knob fully clockwise.
8-2. Connect the Monitor to the OUTPUT Jack of the JX-
305, and also connect the Headphone to the PHONES
Jack. In the case of you use one Monitor, be sure to
insert the opened plug into the another channel of the
OUTPUT to obtain the correct wave form.
Verify the waveform being output by the oscilloscope,
and check the sound.
8-3. When sound test starts, at first sound output from L ch
of MIXOUT and Headphone.
Every time press the [ENTER], output channel is
switched.
At first, JX-305 output sine wave from each jacks, and
next rectangular wave form is output.
start OUTPUT /L sine wave
press [ENTER] OUTPUT /R sine wave
: OUTPUT /L rectangular wave
: OUTPUT /R rectangular wave
Change the connection of the monitor to corresponding
jack.
Pitch of the sound is different depends on each jack.
Verify that no undesired sound is heard.
Verify that no undesired waveform or voltage detected.
Sep. 1998
13