Roland JC-40, Service Notes

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16
Nov. 2015 JC-40
Verifying the Version
Perform verification in the test mode of the next section.
Test Mode
Items Required
• Oscillator
• Noise meter
• Oscilloscope
• FS-5U (x 3)
or
• FS-5U (x 1), FS-6 (x 1)
* Set the POLARITY switch and MODE switch as shown below.
fig.FS-5U.eps
fig.FS-6.eps
• Dummy plug (monaural)
• Audio cables
Entering the Test Mode
1.
Connect the FS-5U (or FS-6) to the FOOT SWITCH CHORUS VIBRATO ,
REVERB and DISTORTION jacks.
2.
Set BRI on the front panel to OFF .
3.
Turn all knobs all the way counterclockwise.
4.
Adjust the LOOP switch on the rear panel to SERIES .
5.
Hold down the pedal connected to the CHORUS VIBRATO jack and turn
on the power.
6.
When the LED flashes, release the pedal, and then immediately press and
release the pedal connected to the
REVERB jack and the DISTORTION
jack in this order.
After the LED flashes several times rapidly, the unit enters the item of
Verifying the Version in the test mode.
Quitting the Test Mode
Turn off the power.
Skipping Test Items
Test items cannot be skipped.
Verifying the Version
The LED lights up to indicate the version as shown in the table below.
Press the pedal connected to the
CHORUS VIBRATO
jack to advance to
the next test item.
DSP Check
The LED lights up, then after approximately 2 seconds, if the DSP check
is OK, the LED goes dark and the execution automatically advances to
the next test item.
If the result is not OK, operation stops.
Switch Check
1.
Connect the dummy plug to the INPUT L/MONO jack.
The LED lights up.
2.
Disconnect the dummy plug.
The LED goes dark.
3.
Connect the dummy plug to the INPUT R jack.
The LED lights up.
4.
Disconnect the dummy plug.
The LED goes dark.
5.
Connect the dummy plug to the PHONES jack.
The LED lights up.
6.
Disconnect the dummy plug.
The LED goes dark.
7.
Connect the dummy plug to the RETURN L/MONO jack.
The LED lights up.
8.
Disconnect the dummy plug.
The LED goes dark.
9.
Adjust the LOOP switch to PARALLEL .
The LED lights up.
10.
Adjust the
LOOP
switch to
SERIAL
.
The LED goes dark.
11.
Press BRI on the front panel to set it to ON .
The LED lights up.
12.
Press BRI to set it to OFF .
The LED goes dark.
13.
Adjust the VIB/CHORUS knob to OFF .
The LED lights up.
14.
Adjust the
VIB/CHORUS
knob to
MANUAL
.
The LED goes dark.
15.
Adjust the VIB/CHORUS knob to FIXED.
The LED flashes and execution automatically advances to the next test item.
Volume Check
1.
Slowly turn the
VOLUME
knob clockwise.
When the knob is turned slightly, the LED goes dark, when the knob is
turned to near the twelve o'clock position, the LED lights up, and when
the knob is turned all the way clockwise, the LED flashes.
* At this time, sound is heard from the speaker.
2.
In the same way, check the operation of the TREBLE , MIDDLE , BASS ,
DISTORTION
,
REVERB
,
SPEED
and
DEPTH
knobs.
When the checking reaches to the DEPTH knob, the LED flashes slowly.
3.
Connect the dummy plug to the INPUT L/MONO jack.
The LED lights up and execution automatically advances to the next test
item.
FS-5U
FS-6
Version Flashing LED (repeats)
1.00 1 long flash
1.01 1 long flash and 1 short flash
1.02 1 long flash and 2 short flash
1.03 1 long flash and 3 short flash