Sound Check - Roland RD-700 Service Note

Jun. 2001
4. LCD Check
Check for any LCD dot abnomalities.
fig.4lcd-dot
Press the [0] button, and check to see that the full screen is lit.
Press the [1] button, and check to see that the full screen is turned off.
Press the [2] button, and check to see that the screen is lit with a vertical
stripe pattern.
Press the [3] button, and check to see that the stripes on the screen
disappear.
Press the [4] button, and check to see that the vertical stripes are
displayed again.
Press both the [EDIT] and CURSOR [ ] buttons to go to the next test.
5. Bender/Pedal Check
Check the bender, modulation and the operation of the pedal.
fig.5bender
Check to see that the displayed value changes from "0" to "127" as you
push the bender lever all the way to the left and right.
(If it changes, the operator name is displayed in reverse video.)
Also make sure that "64" appears when the lever is in the center.
Check to see that the displayed value changes from "0" to "127" as you
push the bender lever all the way over to the modulation side.
Make sure that no pedal is connected to the three [PEDAL] jacks on the
rear panel.
At the same time, make sure that all the "Damper", "FC1" and "FC2"
boxes on the display show "***".
Insert an EV-5 (expression pedal) into the DAMPER jack on the rear
panel.
Check to see that the displayed value changes from "0" to "127" as you
step on the pedal.
(If it changes, the operator name is displayed in reverse video.)
Also check the FC1 and FC2 jacks in the same way.
After the test is completed, the next test starts automatically.
6. Volume Check
Check the operation of the sliding and round VRs.
fig.6volume
Check to see that the displayed value changes from "0" to "127" as you
move the RHYTHM slider all the way up and down.
(If it changes, the operator name is displayed in reverse video.)
Also check the LOWER, UPPER2 and UPPER1 sliders in the same way.
Check to see that the displayed value changes from "0" to "127" as you
move the round VR of EQ LOW all the way to the left and right.
Make sure that "64" is shown when the VR is in the central click position.
Also check the round VRs of EQ MID and EQ HIGH in the same way.
Check to see that the displayed value changes from "0" to "127" as you
move the round VR of REVERB all the way to the left and right.
Also check the round VRs of CHORUS and MULTI EFX in the same way.
After the test is completed, the next test starts automatically.
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7. MIDI Check
Check the MIDI operation.
fig.7-0midi1
Connect MIDI IN and MIDI OUT with a MIDI cable.
When you have connected them, "Connection OK." is momentarily
displayed then changes to the following screen:
fig.7-1midi2
Remove the plug from MIDI OUT while leaving MIDI IN connected.
As you do this, "Disconnection OK."is displayed, then "Check Finished."
momentarily appears.
After the test is completed, the next test starts automatically.

8. Sound Check

Check the output from the sound source.
Set the volume on the RD-700 at the maximum level.
fig.8sound
The following sound is output corresponding to the Tone Select button
pressed:
Tone Select : Sound
[0] : Direct tone
[1] : The tone effected by Chorus
[2] : The tone effected by Reverb
[3] : The tone effected by Resonance
[4] : Sine wave from the left channel only
[5] : Square wave from the right channel only
[6] : Sine wave from both channels
Press each button twice to check the sound.Also, follow the order listed
above when pressing the buttons.
(If not, you will not get any response.)
The tone display changes to reverse video as its sound is output
successfully.
Connect an oscilloscope to the OUTPUT L and R jacks on the rear panel
so that you can obverse the outputs.
Also, connect a set of headphones to the PHONES jack.
As you press each button displayed, the corresponding sound is output.
Be sure to confirm that no abnormal sound is output.
Connect an oscilloscope to the stereo-type standard jacks (TRS type) so
that you can obverse the outputs.
Connections
Tip <- Ch1
Ring <- Ch2
Sleeve <- Ground
Connect an oscilloscope to the OUTPUT L/MONO and R jacks on the
rear panel in the order listed above.
Check the oscilloscope to see that the waveforms from Ch1 and Ch2 are
in reverse phase to each other.
Press both the [EDIT] and CORSOR [ ] buttons to go to the next test.
RD-700